d18p2

.gitignore

@@ -0,0 +1 @@
+target/

day02/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day2"
+version = "0.1.0"

day02/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day2"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day02/src/main.rs

@@ -0,0 +1,29 @@
+use std::env;
+use std::fs;
+
+fn score(line: &str) -> i64 {
+    match line.trim() {
+        "A X" => 3 + 0,
+        "A Y" => 1 + 3,
+        "A Z" => 2 + 6,
+        "B X" => 1 + 0,
+        "B Y" => 2 + 3,
+        "B Z" => 3 + 6,
+        "C X" => 2 + 0,
+        "C Y" => 3 + 3,
+        "C Z" => 1 + 6,
+        _other => 0,
+    }
+}
+
+fn main() {
+    let input = &env::args().collect::<Vec<String>>()[1];
+
+    let mut sum = 0;
+    for line in fs::read_to_string(input).unwrap().lines() {
+        sum += score(line);
+    }
+
+    println!("Sum: {}", sum);
+}
+

day02/src/main1.rs

@@ -0,0 +1,33 @@
+use std::env;
+use std::fs::File;
+use std::io::BufReader;
+use std::io::BufRead;
+
+fn score(line: String) -> i64 {
+    match line.trim() {
+        "A X" => 1 + 3,
+        "A Y" => 2 + 6,
+        "A Z" => 3 + 0,
+        "B X" => 1 + 0,
+        "B Y" => 2 + 3,
+        "B Z" => 3 + 6,
+        "C X" => 1 + 6,
+        "C Y" => 2 + 0,
+        "C Z" => 3 + 3,
+        _other => 0,
+    }
+}
+
+fn main() {
+    let args: Vec<String> = env::args().collect();
+    let input = &args[1];
+    let reader = BufReader::new(File::open(input).expect("where file?"));
+
+    let mut sum = 0;
+    for line in reader.lines() {
+        sum += score(line.unwrap());
+    }
+
+    println!("Sum: {}", sum);
+}
+

day02/test.txt

@@ -0,0 +1,4 @@
+A Y
+B X
+C Z
+

day03/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day3"
+version = "0.1.0"

day03/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day3"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day03/input.txt

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+WqwRjzGtRzZZRRGjWBJzjwmfMTHGGssTTDsrLmmmQLMD
+SNdvSdFlSNNhSPFFcPFclbQQslHmfHTDsTQMLgDTmHQQ
+CNcCFvpdnWpjWwJf
+PVPnVHcnRncGZqbVzHVPnnLbSMjwrzWMjSwDtWwWtwWhwDWz
+pTfsQCshCllpglWWSjBMSQSrMrjM
+hvpvppggCpJTvTmshgfsmZRRHqbcLPHZmPLRnmPZ
+LQbhVZZmZhZjBdbGmgHqnHTmvqgnnWHr
+SzCfDFFNRfsSFFMFfvprvpWzqzgqTwHTvp
+CDNDFJgMDSQhjVdPJLQG
+plpdLdpjjrrHJJjLrrHLFdbzzCcvzgFgcwggzPMFvvcMhM
+GRtSBQNsQlMPRzRlzw
+ZSTtsmBlmjLLpnpH
+hglGNVSdNSghzSgCBhDFLBMBtFMMFtHtbtLL
+frQZccRcqGFmFHrJ
+nvfGZwvTwGTfQwvfTwfgnCSlpdnzgzslppCsCV
+snTSPbQnTTnQgbmsTJsLfZwjffhpLnGRjpGfjL
+dcNWcNHHlNtWHHlCtltWNFNMLZwjpGfpmrZfrFprrRGpwZfp
+HmdNWCmDMVvQPDgqJs
+GGFtSngQLfnSnQffgPnRgFRGRwmRJvwbBbJDwjvTbjrwhJvJ
+WHClslcNNWcqNWlCZdcHsVrThBwBjbhDTDBhrvDZJTwm
+NWVqqcHHNpsNcNVdVlhCMlHQQMQQzLfzQPttFGPMLSLgtF

day03/src/main.rs

@@ -0,0 +1,31 @@
+use std::env;
+use std::fs;
+use std::collections::HashSet;
+
+fn main() {
+    let input = fs::read_to_string(&env::args().nth(1).unwrap()).unwrap();
+    let mut lines = input.lines();
+    let mut next_line;
+
+    let mut sum: u64 = 0;
+    while (next_line = lines.next()) == () && !next_line.is_none() {
+        let line1: HashSet<char> = next_line.unwrap().chars().collect();
+        let line2: HashSet<char> = lines.next().unwrap().chars().collect();
+        'chars: for c in lines.next().unwrap().chars() {
+            if line1.contains(&c) && line2.contains(&c) {
+                sum += value_of(c);
+                break 'chars;
+            }
+        }
+    }
+
+    println!("{:?}", sum);
+}
+
+fn value_of(c: char) -> u64 {
+    if c >= 'a' && c <= 'z' {
+        (c as u64) - ('a' as u64) + 1
+    } else {
+        (c as u64) - ('A' as u64) + 27
+    }
+}

day03/src/main1.rs

@@ -0,0 +1,28 @@
+use std::env;
+use std::fs;
+use std::collections::HashSet;
+
+fn main() {
+    let input = fs::read_to_string(&env::args().nth(1).unwrap()).unwrap();
+
+    let mut sum: u64 = 0;
+    for line in input.lines() {
+        let mut left_chars: HashSet<char> = HashSet::new();
+
+        for (i, c) in line.char_indices() {
+            if i < line.len()/2 {
+                left_chars.insert(c);
+            } else if left_chars.contains(&c) {
+                if c >= 'a' && c <= 'z' {
+                    sum += (c as u64) - ('a' as u64) + 1;
+                } else {
+                    sum += (c as u64) - ('A' as u64) + 27;
+                }
+                break;
+            }
+        }
+    }
+
+    println!("{:?}", sum);
+}
+

day03/test.txt

@@ -0,0 +1,6 @@
+vJrwpWtwJgWrhcsFMMfFFhFp
+jqHRNqRjqzjGDLGLrsFMfFZSrLrFZsSL
+PmmdzqPrVvPwwTWBwg
+wMqvLMZHhHMvwLHjbvcjnnSBnvTQFn
+ttgJtRGJQctTZtZT
+CrZsJsPPZsGzwwsLwLmpwMDw

day04/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day4"
+version = "0.1.0"

day04/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day4"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day04/src/main.rs

@@ -0,0 +1,25 @@
+use std::env;
+use std::fs;
+
+fn main() {
+    let input = fs::read_to_string(&env::args().nth(1).unwrap()).unwrap();
+    let mut sum = 0;
+
+    for line in input.lines() {
+        let (s1, e1, s2, e2) = readline(line);
+        if s1 <= e2 && s2 <= e1 {
+            sum += 1;
+        }
+    }
+
+    println!("Total: {}", sum);
+}
+
+fn readline(line: &str) -> (i64, i64, i64, i64) {
+    let nums: Vec<i64> = line
+        .split(['-', ','])
+        .map(|line| line.parse::<i64>().unwrap())
+        .collect();
+    (nums[0], nums[1], nums[2], nums[3])
+}
+

day04/src/main1.rs

@@ -0,0 +1,25 @@
+use std::env;
+use std::fs;
+
+fn main() {
+    let input = fs::read_to_string(&env::args().nth(1).unwrap()).unwrap();
+    let mut sum = 0;
+
+    for line in input.lines() {
+        let (s1, e1, s2, e2) = readline(line);
+        if (s1 <= s2 && e1 >= e2) || (s1 >= s2 && e1 <= e2) {
+            sum += 1;
+        }
+    }
+
+    println!("Total: {}", sum);
+}
+
+fn readline(line: &str) -> (i64, i64, i64, i64) {
+    let nums: Vec<i64> = line
+        .split(['-', ','])
+        .map(|line| line.parse::<i64>().unwrap())
+        .collect();
+    (nums[0], nums[1], nums[2], nums[3])
+}
+

day04/test.txt

@@ -0,0 +1,6 @@
+2-4,6-8
+2-3,4-5
+5-7,7-9
+2-8,3-7
+6-6,4-6
+2-6,4-8

day05/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day5"
+version = "0.1.0"

day05/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day5"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day05/input.txt

@@ -0,0 +1,511 @@
+            [L] [M]         [M]    
+        [D] [R] [Z]         [C] [L]
+        [C] [S] [T] [G]     [V] [M]
+[R]     [L] [Q] [B] [B]     [D] [F]
+[H] [B] [G] [D] [Q] [Z]     [T] [J]
+[M] [J] [H] [M] [P] [S] [V] [L] [N]
+[P] [C] [N] [T] [S] [F] [R] [G] [Q]
+[Z] [P] [S] [F] [F] [T] [N] [P] [W]
+ 1   2   3   4   5   6   7   8   9 
+
+move 7 from 3 to 9
+move 5 from 8 to 9
+move 3 from 9 to 5
+move 6 from 9 to 2
+move 9 from 9 to 3
+move 3 from 7 to 3
+move 8 from 2 to 3
+move 9 from 3 to 1
+move 11 from 3 to 8
+move 5 from 6 to 9
+move 1 from 6 to 3
+move 1 from 2 to 7
+move 1 from 4 to 8
+move 1 from 3 to 9
+move 4 from 4 to 3
+move 6 from 8 to 3
+move 2 from 8 to 2
+move 4 from 9 to 3
+move 3 from 2 to 5
+move 2 from 5 to 4
+move 5 from 3 to 4
+move 11 from 1 to 4
+move 1 from 7 to 6
+move 1 from 3 to 5
+move 2 from 1 to 9
+move 1 from 1 to 4
+move 7 from 5 to 8
+move 21 from 4 to 6
+move 6 from 6 to 2
+move 6 from 8 to 9
+move 5 from 8 to 5
+move 2 from 2 to 7
+move 4 from 3 to 7
+move 1 from 2 to 6
+move 1 from 2 to 5
+move 2 from 2 to 7
+move 4 from 3 to 7
+move 1 from 4 to 6
+move 9 from 5 to 3
+move 7 from 3 to 4
+move 7 from 7 to 3
+move 7 from 4 to 1
+move 8 from 3 to 5
+move 1 from 3 to 5
+move 3 from 8 to 2
+move 2 from 2 to 9
+move 13 from 9 to 4
+move 5 from 5 to 3
+move 4 from 7 to 6
+move 1 from 7 to 4
+move 2 from 4 to 2
+move 3 from 3 to 4
+move 2 from 5 to 2
+move 6 from 1 to 7
+move 1 from 2 to 8
+move 1 from 3 to 8
+move 1 from 1 to 6
+move 1 from 3 to 4
+move 1 from 2 to 6
+move 24 from 6 to 1
+move 3 from 2 to 3
+move 3 from 3 to 5
+move 2 from 8 to 6
+move 2 from 5 to 4
+move 3 from 5 to 1
+move 7 from 4 to 8
+move 3 from 8 to 9
+move 2 from 9 to 5
+move 2 from 6 to 3
+move 1 from 9 to 8
+move 5 from 7 to 5
+move 2 from 3 to 1
+move 1 from 7 to 1
+move 7 from 4 to 7
+move 2 from 4 to 8
+move 6 from 8 to 6
+move 3 from 6 to 9
+move 10 from 5 to 1
+move 7 from 7 to 1
+move 1 from 4 to 9
+move 1 from 6 to 3
+move 2 from 9 to 7
+move 1 from 4 to 2
+move 1 from 9 to 5
+move 1 from 8 to 5
+move 39 from 1 to 8
+move 1 from 2 to 5
+move 2 from 6 to 9
+move 3 from 9 to 5
+move 3 from 1 to 6
+move 1 from 7 to 2
+move 1 from 3 to 2
+move 2 from 6 to 2
+move 3 from 2 to 3
+move 1 from 6 to 2
+move 1 from 1 to 8
+move 3 from 1 to 2
+move 3 from 2 to 4
+move 2 from 4 to 5
+move 2 from 3 to 8
+move 8 from 5 to 2
+move 8 from 8 to 2
+move 15 from 2 to 7
+move 1 from 1 to 5
+move 25 from 8 to 7
+move 2 from 2 to 4
+move 2 from 4 to 3
+move 1 from 8 to 4
+move 2 from 4 to 6
+move 1 from 2 to 1
+move 26 from 7 to 2
+move 15 from 2 to 1
+move 7 from 8 to 9
+move 10 from 1 to 6
+move 10 from 7 to 2
+move 1 from 8 to 1
+move 5 from 9 to 8
+move 1 from 8 to 9
+move 2 from 6 to 9
+move 3 from 7 to 1
+move 1 from 7 to 1
+move 5 from 9 to 2
+move 1 from 3 to 1
+move 9 from 6 to 3
+move 1 from 6 to 1
+move 4 from 2 to 4
+move 3 from 4 to 8
+move 1 from 4 to 1
+move 9 from 3 to 1
+move 1 from 7 to 6
+move 9 from 2 to 5
+move 14 from 1 to 6
+move 1 from 3 to 8
+move 5 from 2 to 6
+move 8 from 1 to 8
+move 6 from 6 to 8
+move 14 from 6 to 7
+move 1 from 1 to 7
+move 10 from 5 to 4
+move 11 from 8 to 5
+move 15 from 7 to 1
+move 4 from 5 to 6
+move 4 from 8 to 9
+move 6 from 5 to 3
+move 1 from 6 to 9
+move 1 from 1 to 6
+move 1 from 5 to 8
+move 2 from 6 to 2
+move 6 from 1 to 5
+move 1 from 5 to 8
+move 2 from 5 to 4
+move 9 from 2 to 9
+move 13 from 9 to 8
+move 1 from 2 to 1
+move 1 from 4 to 8
+move 3 from 3 to 1
+move 2 from 4 to 5
+move 2 from 1 to 5
+move 1 from 9 to 3
+move 17 from 8 to 1
+move 3 from 3 to 2
+move 4 from 5 to 1
+move 2 from 2 to 4
+move 1 from 6 to 1
+move 1 from 2 to 8
+move 4 from 4 to 6
+move 1 from 5 to 9
+move 5 from 6 to 8
+move 1 from 5 to 4
+move 1 from 5 to 6
+move 3 from 8 to 6
+move 8 from 4 to 5
+move 32 from 1 to 7
+move 11 from 7 to 6
+move 8 from 5 to 3
+move 3 from 8 to 7
+move 6 from 3 to 9
+move 4 from 3 to 8
+move 5 from 8 to 2
+move 1 from 8 to 5
+move 11 from 6 to 3
+move 1 from 5 to 2
+move 2 from 8 to 6
+move 12 from 7 to 8
+move 2 from 6 to 2
+move 2 from 6 to 4
+move 5 from 2 to 5
+move 8 from 7 to 2
+move 2 from 7 to 1
+move 2 from 7 to 6
+move 5 from 5 to 4
+move 5 from 4 to 7
+move 5 from 8 to 2
+move 2 from 9 to 7
+move 5 from 8 to 4
+move 2 from 7 to 3
+move 2 from 9 to 3
+move 3 from 7 to 9
+move 1 from 1 to 8
+move 2 from 6 to 1
+move 2 from 9 to 8
+move 1 from 7 to 8
+move 1 from 2 to 5
+move 1 from 7 to 9
+move 7 from 4 to 3
+move 3 from 3 to 6
+move 5 from 8 to 6
+move 3 from 9 to 5
+move 16 from 3 to 1
+move 2 from 9 to 1
+move 7 from 1 to 8
+move 1 from 1 to 2
+move 5 from 8 to 2
+move 12 from 1 to 4
+move 1 from 3 to 5
+move 1 from 2 to 9
+move 1 from 9 to 4
+move 4 from 6 to 5
+move 5 from 6 to 1
+move 1 from 6 to 5
+move 1 from 1 to 4
+move 1 from 4 to 7
+move 1 from 3 to 7
+move 9 from 4 to 6
+move 2 from 7 to 8
+move 1 from 3 to 4
+move 2 from 8 to 9
+move 4 from 8 to 4
+move 4 from 2 to 8
+move 2 from 9 to 7
+move 2 from 7 to 8
+move 10 from 2 to 4
+move 1 from 2 to 1
+move 5 from 4 to 7
+move 1 from 1 to 3
+move 3 from 8 to 7
+move 6 from 7 to 2
+move 3 from 2 to 7
+move 1 from 6 to 7
+move 5 from 5 to 8
+move 4 from 1 to 3
+move 4 from 3 to 1
+move 8 from 4 to 2
+move 1 from 3 to 2
+move 2 from 7 to 2
+move 2 from 6 to 3
+move 4 from 7 to 2
+move 4 from 5 to 7
+move 14 from 2 to 7
+move 3 from 2 to 1
+move 3 from 8 to 2
+move 1 from 5 to 7
+move 6 from 2 to 4
+move 2 from 2 to 7
+move 2 from 3 to 6
+move 6 from 8 to 2
+move 4 from 6 to 4
+move 2 from 6 to 9
+move 4 from 4 to 2
+move 2 from 4 to 8
+move 10 from 7 to 2
+move 18 from 2 to 6
+move 2 from 2 to 6
+move 2 from 9 to 2
+move 2 from 8 to 5
+move 1 from 2 to 9
+move 1 from 2 to 9
+move 1 from 5 to 7
+move 1 from 2 to 6
+move 2 from 9 to 2
+move 6 from 7 to 3
+move 7 from 6 to 8
+move 5 from 7 to 2
+move 1 from 7 to 4
+move 1 from 5 to 7
+move 4 from 8 to 7
+move 5 from 2 to 3
+move 1 from 7 to 5
+move 2 from 2 to 8
+move 9 from 4 to 3
+move 13 from 6 to 8
+move 10 from 3 to 1
+move 1 from 5 to 2
+move 3 from 6 to 8
+move 5 from 1 to 2
+move 1 from 1 to 8
+move 2 from 4 to 3
+move 17 from 8 to 6
+move 5 from 6 to 3
+move 3 from 1 to 2
+move 9 from 6 to 5
+move 2 from 6 to 8
+move 5 from 5 to 9
+move 3 from 9 to 8
+move 3 from 1 to 3
+move 3 from 7 to 5
+move 6 from 5 to 8
+move 7 from 2 to 4
+move 1 from 6 to 3
+move 1 from 1 to 5
+move 4 from 4 to 5
+move 2 from 2 to 9
+move 3 from 1 to 3
+move 4 from 5 to 8
+move 1 from 4 to 5
+move 6 from 8 to 7
+move 1 from 5 to 2
+move 4 from 9 to 2
+move 2 from 5 to 9
+move 2 from 1 to 8
+move 2 from 4 to 9
+move 6 from 7 to 5
+move 3 from 5 to 2
+move 3 from 2 to 5
+move 10 from 8 to 3
+move 2 from 8 to 5
+move 3 from 2 to 5
+move 6 from 5 to 1
+move 4 from 5 to 6
+move 1 from 7 to 5
+move 23 from 3 to 7
+move 2 from 5 to 9
+move 2 from 1 to 5
+move 2 from 6 to 3
+move 6 from 3 to 1
+move 1 from 1 to 7
+move 4 from 3 to 1
+move 1 from 8 to 5
+move 2 from 9 to 2
+move 3 from 3 to 8
+move 2 from 6 to 8
+move 12 from 1 to 3
+move 1 from 9 to 7
+move 3 from 5 to 9
+move 9 from 3 to 8
+move 1 from 1 to 7
+move 1 from 9 to 4
+move 3 from 3 to 6
+move 3 from 2 to 1
+move 3 from 8 to 6
+move 1 from 4 to 2
+move 1 from 2 to 9
+move 1 from 2 to 7
+move 20 from 7 to 5
+move 3 from 7 to 3
+move 3 from 1 to 3
+move 5 from 8 to 1
+move 5 from 1 to 5
+move 4 from 5 to 2
+move 3 from 2 to 6
+move 3 from 8 to 7
+move 1 from 2 to 6
+move 2 from 8 to 6
+move 2 from 7 to 5
+move 2 from 3 to 6
+move 12 from 5 to 1
+move 6 from 5 to 7
+move 12 from 6 to 8
+move 4 from 9 to 3
+move 4 from 5 to 8
+move 3 from 1 to 5
+move 4 from 7 to 4
+move 3 from 5 to 9
+move 7 from 1 to 6
+move 1 from 1 to 3
+move 6 from 7 to 6
+move 1 from 1 to 3
+move 10 from 3 to 6
+move 10 from 6 to 2
+move 2 from 9 to 5
+move 4 from 6 to 5
+move 9 from 6 to 1
+move 16 from 8 to 7
+move 3 from 8 to 7
+move 1 from 8 to 1
+move 7 from 2 to 1
+move 1 from 5 to 9
+move 1 from 6 to 1
+move 2 from 2 to 1
+move 3 from 1 to 4
+move 1 from 6 to 8
+move 7 from 4 to 1
+move 1 from 8 to 2
+move 22 from 1 to 8
+move 18 from 7 to 9
+move 6 from 5 to 2
+move 2 from 2 to 7
+move 2 from 1 to 5
+move 4 from 7 to 6
+move 1 from 5 to 6
+move 2 from 8 to 2
+move 3 from 2 to 6
+move 1 from 5 to 6
+move 15 from 9 to 6
+move 6 from 9 to 5
+move 1 from 9 to 8
+move 1 from 2 to 9
+move 5 from 5 to 9
+move 9 from 8 to 6
+move 3 from 2 to 7
+move 12 from 8 to 9
+move 1 from 7 to 5
+move 1 from 5 to 7
+move 3 from 7 to 1
+move 17 from 6 to 3
+move 1 from 2 to 6
+move 2 from 1 to 4
+move 16 from 6 to 4
+move 7 from 4 to 6
+move 1 from 5 to 7
+move 8 from 4 to 5
+move 9 from 9 to 8
+move 16 from 3 to 7
+move 1 from 1 to 5
+move 3 from 5 to 1
+move 5 from 6 to 2
+move 3 from 1 to 7
+move 3 from 6 to 7
+move 3 from 9 to 3
+move 5 from 8 to 5
+move 11 from 5 to 7
+move 2 from 3 to 7
+move 1 from 2 to 1
+move 1 from 3 to 6
+move 17 from 7 to 9
+move 1 from 3 to 2
+move 3 from 4 to 6
+move 1 from 1 to 2
+move 1 from 6 to 4
+move 14 from 7 to 6
+move 15 from 9 to 6
+move 4 from 8 to 7
+move 1 from 4 to 7
+move 7 from 9 to 5
+move 5 from 2 to 9
+move 7 from 5 to 1
+move 3 from 1 to 7
+move 29 from 6 to 4
+move 1 from 2 to 4
+move 18 from 4 to 2
+move 3 from 1 to 4
+move 1 from 1 to 7
+move 18 from 2 to 4
+move 3 from 6 to 5
+move 15 from 4 to 1
+move 1 from 5 to 1
+move 1 from 5 to 4
+move 9 from 4 to 1
+move 5 from 1 to 3
+move 9 from 1 to 5
+move 2 from 4 to 3
+move 5 from 5 to 6
+move 3 from 7 to 9
+move 7 from 7 to 5
+move 6 from 4 to 6
+move 2 from 3 to 7
+move 6 from 5 to 8
+move 2 from 8 to 4
+move 1 from 8 to 9
+move 9 from 6 to 2
+move 3 from 9 to 3
+move 1 from 2 to 1
+move 6 from 7 to 4
+move 2 from 2 to 8
+move 3 from 9 to 5
+move 5 from 4 to 8
+move 1 from 6 to 9
+move 1 from 3 to 1
+move 1 from 3 to 4
+move 1 from 6 to 5
+move 1 from 9 to 3
+move 10 from 8 to 7
+move 3 from 9 to 2
+move 7 from 2 to 4
+move 6 from 5 to 7
+move 4 from 5 to 8
+move 7 from 3 to 2
+move 3 from 7 to 1
+move 9 from 1 to 5
+move 5 from 7 to 9
+move 7 from 1 to 4
+move 11 from 4 to 2
+move 4 from 8 to 3
+move 5 from 4 to 7
+move 4 from 4 to 1
+move 1 from 3 to 6
+move 12 from 7 to 4
+move 2 from 1 to 8
+move 5 from 9 to 7
+move 7 from 5 to 6
+move 1 from 1 to 4
+move 1 from 9 to 8
+move 1 from 4 to 7
+move 1 from 8 to 9
+move 5 from 7 to 9
+move 2 from 7 to 5
+move 2 from 6 to 3
+move 5 from 2 to 7
+move 1 from 7 to 8
+move 1 from 1 to 6
+move 3 from 5 to 1

day05/src/main.rs

@@ -0,0 +1,62 @@
+use std::env;
+use std::fs;
+use std::collections::VecDeque;
+
+fn main() {
+    let (mut stacks, moves) = read_input(&env::args().nth(1).unwrap());
+    println!("stack = {:?}", stacks);
+    println!("moves = {:?}", moves);
+
+    for (n, from, to) in moves {
+        let mut crane: Vec<char> = Vec::new();
+        for _i in 1..=n {
+            crane.push(stacks[from].pop_front().unwrap());
+        }
+        for _i in 1..=n {
+            stacks[to].push_front(crane.pop().unwrap());
+        }
+    }
+
+    let res: String = stacks.iter()
+            .map(|stack| stack.front().unwrap())
+            .collect();
+    println!("res = {:?}", res);
+}
+
+fn read_input(file: &str) -> (Vec<VecDeque<char>>, Vec<(usize, usize, usize)>) {
+    let input = fs::read_to_string(file).unwrap();
+
+    let n_stacks = (input.lines().next().unwrap().len() + 1) / 4;
+    let mut stacks: Vec<VecDeque<char>> = vec![VecDeque::new(); n_stacks];
+    let mut moves: Vec<(usize, usize, usize)> = Vec::new();
+    let mut reading_crates = true;
+
+    for line in input.lines() {
+        if line.is_empty() || (reading_crates && has_digit(line)) {
+            reading_crates = false;
+            continue;
+
+        } else if reading_crates {
+            for (i, c) in line.char_indices() {
+                if i % 4 == 1 && c != ' '{
+                    stacks[i/4].push_back(c);
+                }
+            }
+
+        } else {
+            let nums: Vec<usize> = line
+                    .split(|c: char| !c.is_numeric())
+                    .filter(|s| !s.is_empty())
+                    .map(|num| num.parse::<usize>().unwrap())
+                    .collect();
+            moves.push((nums[0], nums[1] - 1, nums[2] - 1));
+            
+        }
+    }
+    (stacks, moves)
+}
+
+fn has_digit(line: &str) -> bool {
+    !line.chars().filter(|c| c.is_digit(10)).collect::<Vec<char>>().is_empty()
+}
+

day05/src/main1.rs

@@ -0,0 +1,59 @@
+use std::env;
+use std::fs;
+use std::collections::VecDeque;
+
+fn main() {
+    let (mut stacks, moves) = read_input(&env::args().nth(1).unwrap());
+    println!("stack = {:?}", stacks);
+    println!("moves = {:?}", moves);
+
+    for (n, from, to) in moves {
+        for _i in 1..=n {
+            let item = stacks[from].pop_front().unwrap();
+            stacks[to].push_front(item);
+        }
+    }
+
+    let res: String = stacks.iter()
+            .map(|stack| stack.front().unwrap())
+            .collect();
+    println!("res = {:?}", res);
+}
+
+fn read_input(file: &str) -> (Vec<VecDeque<char>>, Vec<(usize, usize, usize)>) {
+    let input = fs::read_to_string(file).unwrap();
+
+    let n_stacks = (input.lines().next().unwrap().len() + 1) / 4;
+    let mut stacks: Vec<VecDeque<char>> = vec![VecDeque::new(); n_stacks];
+    let mut moves: Vec<(usize, usize, usize)> = Vec::new();
+    let mut reading_crates = true;
+
+    for line in input.lines() {
+        if line.is_empty() || (reading_crates && has_digit(line)) {
+            reading_crates = false;
+            continue;
+
+        } else if reading_crates {
+            for (i, c) in line.char_indices() {
+                if i % 4 == 1 && c != ' '{
+                    stacks[i/4].push_back(c);
+                }
+            }
+
+        } else {
+            let nums: Vec<usize> = line
+                    .split(|c: char| !c.is_numeric())
+                    .filter(|s| !s.is_empty())
+                    .map(|num| num.parse::<usize>().unwrap())
+                    .collect();
+            moves.push((nums[0], nums[1] - 1, nums[2] - 1));
+            
+        }
+    }
+    (stacks, moves)
+}
+
+fn has_digit(line: &str) -> bool {
+    !line.chars().filter(|c| c.is_digit(10)).collect::<Vec<char>>().is_empty()
+}
+

day05/test.txt

@@ -0,0 +1,9 @@
+    [D]    
+[N] [C]    
+[Z] [M] [P]
+ 1   2   3 
+
+move 1 from 2 to 1
+move 3 from 1 to 3
+move 2 from 2 to 1
+move 1 from 1 to 2

day06/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day6"
+version = "0.1.0"

day06/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day6"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day06/input.txt

@@ -0,0 +1 @@
+zcncrcnrrlccmhchssgqsqrsstfffnqfnfsswgwjjcmcnnvjvwjvwvfvnvwwhvvwmwhmwwwhbhhldhdmhhdfdbdfbdblllnfllgslllqhlhfhlhqllncnfnsffwmwzzlglzlwlhwwmvmddpvvbrvrdvrdvdhhzdhdpdzzbgbsssrpsrshrshhbqbgbmmtwwcbcrbbvnvhnncscwcwlcwlwnwswbbnwntthzzdlzdzffvqvdqvvtptdptphpddzzvhzvzwwqgqjjjvsspvspsbsffvpvcvjcvjvrvjjgmjjhrrdhhdvhvttjttzptpssnlnjjlnnhmnndjnjwwtjjtbbfflwfwgwvvpjpwpcwcgglmgmdmnmbbqtqctcwcmwwvmvlmvmdvdvhvlhlzhzttghttnvnjntnqqtmtwwhvhrhfhchqchhdrdllnwnfwfjjmsmmnhhshnhpptstjjpnpzzhmmpssgrsrzsrrffzjjhvjhjcjcpcvpccfnfjnfjfllssrdsdnnmffldldppcctcmtctffprpsrrrfhfmflldccnpppvsswppdgpgjpgpqgpqpjppclcjczcnzzzqvzzwlzzqfzffsqqphqhvqqbcccstsdttwcwcvvmjjhqqmllpglgtgwgnnbnrbnnjdndhhbrbvrvwwwblwwwppmdmttztqzqrqjjpggpmgpmpqqmssvnsvnndnvddtztddrrsnsbbshhqmhqmmdnnrsrllqvvfjfpfqpqfqflqlmqmrrqgrqrrhvvfddfhhfnhnlncnzzwwjwswpsscpchcssrzssjqsqrsswbbzggnqnwqqsrqqzbqbddtffcjjdggwlwnwtnnpddcqddsppcwpcwpphvphhhrprqrqttwgwqwppvdpvvrgggmpmddzvvwwthwtttbqtbbftfrffbdfbbspshphpwhppnhnmhhbbshbsbmbdmmtrmrbrprbprphhnmhmvhmhhqqbvqvqcvcwcbwcchbbgwwqffrcffsvvcczrztrzzdhdmhdmmzbbvlvqqtptpvvfsfppdzppmddfvdfdwdfdmdwwlvvqdvqdqmdqqmnmdndsswsfwfvwfwzzhrzhhwfhhpvhppmssnhsnsnwswvwlwdwzwnwswwmqmjmbbdjdbbtllcpllltqlttnvvppznpnttlrrwlwvllphpbblccgjcggbtbwtwdwrrbnndpddbqqnpnrnnqqshspsggtptztpzzclcggtqtgqttcmmbgbfbdfdfsddlrlvrlvvmqqgbqgbqbcbbnpplqqblqbqmbbbdqbbhjjcgcdgdwdjwjqqlsqqnnwffglfglgnlggjgjtgjtgjtgjjclcwcqqvpvwwvgvhgvhvjjzpzbznnvrrrpbpdbdhhmshsnnnwppcbcvvlldccdggqnqgnqqzbzzcfflnnmppcgcmgmrgmrgmgngwwptpzzpfzpfzpzdppgcgtcgtgccvtctzzdmzmlmzlzwllbplblltgtctrrghgvhgvvfvssngsschshrhvrvddghgwwwwzgwgvgccjdjzjwwvdvvqsqshsvvddmddbllvppmlpmlmwlwppjmppwrrdzrrpmrmrdmrmbmzzwttvwwsfswwlflnlrlvvdllzbztbtpbtppnjpnpdnnjrjsshtssvvsjvjfjwffsszvsvjssqzsslpslppjpspqptbncvzrlwtjvsrwtnzzhwdfsmlthvgqgjrpshpbsrrvnsdbqslbcplnpcjqwmwqsnwdcjsdmccbdglwbrcdcqsfhjqhstvhqqdwltqwhhqcrnpvnzjhhbjvqbqhclwggjqfvnfsvcnjjhbmrvbpjqrbljbtltvnsgdfhddlmsdhcrfwvlvbsdrjwjvtnqzhrlqgjmzsmjlpdjsrjmdhmvgwjmfwtqffnzfrtswrlgvvhhqgpzcjwscfqgjmdhtvbgzdlvzfhgqlqbfwsjrmmhrlcwhrcnwwvngcmsrfgczsfqvvmdtmtprfvjrwrwcqwvgmzcjncrzvcswlzsdszvdtwmptnrhgzqwrhjjtbchhpwsdjnqmnsgzwqzvlzlsznpqgvtqnldjqpvndtsjlzhpzsgthbwvwnlbwjlmndqpcdvjdgdzhctpghlfwrtqtvfwdpgrjbmwzqgthjpmlrsqmzsznddhrbjnggqrdntpbngvldnnltfnmdwfhftjvpqbrzqvdzbzzctshzldtcdgfnczglrrjtwswzdvjrfgwztwznbpplmbgwpcmstcsjtqhmzmzsjwsfbjlbnbdtdsmlpdmrrbhdhpzrjdpzhcwsrgfrhmqzqtjfhpvltnthwjrrrpnsbmmwrhsfqbmnvwhpntltsgwgnqhcvlndfrtrfrnlmbhltmtgzhlzqgtsbbnggdjvbslfbczhpghqqcqlrbtpnbqbflfjrmpmwwvjqgvcqtmfggmptqlqstcmdtqlslnnzwbgnstftfsvsjdrmgbzfnzltwbjmqhsvshnmwhftjdndltdpngzwbrjpgpwmqgfsflnhmtzcmdjmzwrsrrrmpvwgggwrhrwtfwdbgbpmwpcdspdtbqvdwwsnwdtrtdtgnfzzsmlbcqdzbsqnrgtvvnlfcdlcgcnfpqbddqcjfqtmpndmnwvfqgjzrltqvlprmbbhmtwbzjjgfhhhfjswpffmjnsdmrcjrwlwpmfrmhljpphlwwwwmgsjcsrcvmfrdjdhshddshpplzsnsphcmdhvllgmdgrvbvjmtpltdthffsvwwhvgqrhmfjfpdswcqldrhpmznffjsntwrnmnpmsshljszbchctptsdlnbcvpfvtlfnzcrljpdwrsjnlpqcpnwvnqhzhqmjbvlbtgslzthlbbjzsgdglbrltzjdshpfbndjtssvsjqlstnrjdzzjvlpqhmwvrsvndcqrqjjcsqvmvrbhngtcfdprlbnqmhqllddgjpdzbjlphntrtgjrdgtbslrtzczbnnlddzzsvqvqvvzjpjqfhztgtsfggdppfdhzsbjzqjmpnmgqzlsdhjjbfpbsbnzpmhwrzjqhczrgcsflfwtrgwbnbrshjpwltntsnsdhmhqlmzdprcrcpcpjnphsmjwhzdqtncdbwgspmnfzsgmpbdhmslqchhhbbwfrghhnfjplsvrtbvplgrwdnbnfsgpwrqczvzlnfsngnsnbwvpmfdcmjztdnrllslnwcfwwnwsvztqmgqtfvmdqrrrmwfmphbcvwwttpmwjjbvqrmlwtwfsjdpcbmdlnlzcqntfzzmslshwprjfhwwpbbdfcdjwllfwcznwpjpwrlsfnnbgzjllrgtzcdcvhdhbtlrcvfdvsdjlzsmwwqvpzfhzjlqpfbqstvfrpcchmtwgbrhqqbglrvzmctdlpnvmglgdtzpbdngtfdnmsmwbgjstzbqwqcdlhfrtqqnhqvpfhdrjqvsvstftdgwwnwpfbfbdcfqnqlwpdnfhhfctwrgdqpbpbmgnfsnbpjfctvdtjnsfqlrtctrnjgltndngcmrdphhsqpjhprbngjzqqhnhhrdwlwwpmhzwshvrtzfgzlrhwghvpvfprbbvflltplpptvrmwcrdqndfqbfqtlqqwvphsmcvnbzghvsptrphhfcgdsslhfbcwhtjcmnpbvqrfgpsjgqpnnwwhjjwqrhhqgznwdzjqbtmmjljjwctqtfgwqbdrjwqwbbcftvjwfdfrgvsrlcrccpvfzdrcjvqfbhddpvrrhjrmhdgchrghbzsqpmgnmslfctblwlvphdfpvtdtwpdfsjwssmgnsvsqpdbqngccsplhmjbwjwtzwsbjhwpwcslqjdchmbvzrbgnwvjrrrdtvhtlzlrbwthzlhhqzzpvpwbzrrbrbtpwnhldhqqltqrqdddfwdmjzgctnlrjrjwvddfmjpnptdmrvnqjvsjfrmlvlqsthhsbvnjlsdzrjngfnqdjfssmvgrchbwmwbbvfqfhvrtwghmrpddnwbrbvbmqvfzbjdsnbzgrtmsfhmsmjtrqsgmpnwwbfwtp

day06/src/main.rs

@@ -0,0 +1,25 @@
+use std::env;
+use std::fs::File;
+use std::io::{BufReader, Read};
+use std::collections::{VecDeque, HashSet};
+
+fn main() {
+    let file = File::open(&env::args().nth(1).unwrap()).unwrap();
+    let reader = BufReader::new(file);
+
+    let mut prevs: VecDeque<u8> = VecDeque::new();
+    let mut i = 0;
+    for byte in reader.bytes() {
+        i += 1;
+        prevs.push_back(byte.unwrap());
+        if prevs.len() > 14 {
+            prevs.pop_front();
+        }
+        let set: HashSet<u8> = HashSet::from_iter(prevs.iter().cloned());
+        if set.len() == 14 {
+            println!("{}", i);
+            break;
+        }
+    }
+}
+

day06/src/main1.rs

@@ -0,0 +1,26 @@
+use std::env;
+use std::fs::File;
+use std::io::{BufReader, Read};
+
+fn main() {
+    let file = File::open(&env::args().nth(1).unwrap()).unwrap();
+    let reader = BufReader::new(file);
+
+    let (mut x1, mut x2, mut x3) = (0, 0, 0);
+    let mut i = 0;
+    for byte in reader.bytes() {
+        i += 1;
+        let c = byte.unwrap();
+        if c != x1 && c != x2 && c != x3
+                && x1 != x2 && x1 != x3 && x2 != x3
+                && x1 != 0 {
+            println!("{}", i);
+            break;
+        } else {
+            x1 = x2;
+            x2 = x3;
+            x3 = c;
+        }
+    }
+}
+

day06/test.txt

@@ -0,0 +1 @@
+mjqjpqmgbljsphdztnvjfqwrcgsmlb

day07/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day7"
+version = "0.1.0"

day07/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day7"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day07/src/main.rs

@@ -0,0 +1,94 @@
+use std::env;
+use std::fs::File;
+use std::io::{self, BufRead};
+use std::collections::HashMap;
+
+const MAX_SIZE: usize = 70_000_000 - 30_000_000;
+
+fn main() {
+    let file = File::open(&env::args().nth(1).unwrap()).unwrap();
+    let mut lines = io::BufReader::new(file).lines();
+    let mut tree = DirTree::new();
+    let mut cwd = 0;
+
+    loop {
+        let tokens: Vec<_> = if let Some(Ok(l)) = lines.next() {
+           l.split_whitespace().map(String::from).collect()
+        } else { break; };
+
+        if tokens[0] == "$" {
+            if tokens[1] == "cd" {
+                if tokens[2] == ".." {
+                    cwd = tree.inodes[cwd].parent.unwrap();
+                } else if tokens[2] == "/" {
+                    cwd = 0;
+                } else {
+                    let subdir = tree.inodes[cwd].subdirs[&tokens[2]];
+                    cwd = subdir;
+                }
+            } else if tokens[1] == "ls" {
+                continue;
+            }
+        } else if tokens[0] == "dir" {
+            tree.add_subdir_to(cwd, tokens[1].clone());
+        } else {
+            tree.add_file_to(
+                cwd,
+                tokens[1].clone(),
+                tokens[0].parse::<usize>().unwrap());
+        }
+    }
+
+    let total_size = tree.size_of(0);
+    let answer: usize = (0..tree.inodes.len())
+        .map(|inode| tree.size_of(inode))
+        .filter(|size| total_size - *size <= MAX_SIZE)
+        .min().unwrap();
+    println!("{:?}", answer);
+}
+
+#[derive(Debug)]
+struct Dir {
+    pub files: HashMap<String, usize>, // file name and size
+    pub subdirs: HashMap<String, usize>, // dir name and index into arena
+    pub parent: Option<usize>, // index into arena
+}
+
+#[derive(Debug)]
+struct DirTree {
+    inodes: Vec<Dir>,
+}
+
+impl DirTree {
+    fn new() -> Self {
+        let newdir = Dir {
+            files: HashMap::new(),
+            subdirs: HashMap::new(),
+            parent: None,
+        };
+        DirTree { inodes: vec![newdir] }
+    }
+
+    fn add_subdir_to(&mut self, idx: usize, name: String) {
+        let newidx = self.inodes.len();
+        let newdir = Dir {
+            files: HashMap::new(),
+            subdirs: HashMap::new(),
+            parent: Some(idx),
+        };
+        self.inodes.push(newdir);
+        self.inodes[idx].subdirs.insert(name, newidx);
+    }
+
+    fn add_file_to(&mut self, idx: usize, name: String, size: usize) {
+        self.inodes[idx].files.insert(name, size);
+    }
+
+    fn size_of(&self, inode: usize) -> usize {
+        let size_files: usize = self.inodes[inode].files.values().sum();
+        let size_dirs: usize = self.inodes[inode].subdirs.values()
+            .fold(0, |acc, subdir_inode| acc + self.size_of(*subdir_inode));
+        size_files + size_dirs
+    }
+}
+

day07/src/main1.rs

@@ -0,0 +1,91 @@
+use std::env;
+use std::fs::File;
+use std::io::{self, BufRead};
+use std::collections::HashMap;
+
+fn main() {
+    let file = File::open(&env::args().nth(1).unwrap()).unwrap();
+    let mut lines = io::BufReader::new(file).lines();
+    let mut tree = DirTree::new();
+    let mut cwd = 0;
+
+    loop {
+        let tokens: Vec<_> = if let Some(Ok(l)) = lines.next() {
+           l.split_whitespace().map(String::from).collect()
+        } else { break; };
+
+        if tokens[0] == "$" {
+            if tokens[1] == "cd" {
+                if tokens[2] == ".." {
+                    cwd = tree.inodes[cwd].parent.unwrap();
+                } else if tokens[2] == "/" {
+                    cwd = 0;
+                } else {
+                    let subdir = tree.inodes[cwd].subdirs[&tokens[2]];
+                    cwd = subdir;
+                }
+            } else if tokens[1] == "ls" {
+                continue;
+            }
+        } else if tokens[0] == "dir" {
+            tree.add_subdir_to(cwd, tokens[1].clone());
+        } else {
+            tree.add_file_to(
+                cwd,
+                tokens[1].clone(),
+                tokens[0].parse::<usize>().unwrap());
+        }
+    }
+
+    let sum: usize = (0..tree.inodes.len())
+        .map(|inode| tree.size_of(inode))
+        .filter(|size| *size <= 100000)
+        .sum();
+    println!("{:?}", sum);
+}
+
+#[derive(Debug)]
+struct Dir {
+    pub files: HashMap<String, usize>, // file name and size
+    pub subdirs: HashMap<String, usize>, // dir name and index into arena
+    pub parent: Option<usize>, // index into arena
+}
+
+#[derive(Debug)]
+struct DirTree {
+    inodes: Vec<Dir>,
+}
+
+impl DirTree {
+    fn new() -> Self {
+        let newdir = Dir {
+            files: HashMap::new(),
+            subdirs: HashMap::new(),
+            parent: None,
+        };
+        DirTree { inodes: vec![newdir] }
+    }
+
+    fn add_subdir_to(&mut self, idx: usize, name: String) {
+        let newidx = self.inodes.len();
+        let newdir = Dir {
+            files: HashMap::new(),
+            subdirs: HashMap::new(),
+            parent: Some(idx),
+        };
+        self.inodes.push(newdir);
+        self.inodes[idx].subdirs.insert(name, newidx);
+    }
+
+    fn add_file_to(&mut self, idx: usize, name: String, size: usize) {
+        self.inodes[idx].files.insert(name, size);
+    }
+
+    fn size_of(&self, inode: usize) -> usize {
+        let size_files: usize = self.inodes[inode].files.values().sum();
+        let size_dirs: usize = self.inodes[inode].subdirs.values()
+            .fold(0, |acc, subdir_inode| acc + self.size_of(*subdir_inode));
+        size_files + size_dirs
+    }
+}
+

day07/test.txt

@@ -0,0 +1,23 @@
+$ cd /
+$ ls
+dir a
+14848514 b.txt
+8504156 c.dat
+dir d
+$ cd a
+$ ls
+dir e
+29116 f
+2557 g
+62596 h.lst
+$ cd e
+$ ls
+584 i
+$ cd ..
+$ cd ..
+$ cd d
+$ ls
+4060174 j
+8033020 d.log
+5626152 d.ext
+7214296 k

day08/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day8"
+version = "0.1.0"

day08/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day8"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day08/input.txt

@@ -0,0 +1,99 @@
+323312120104041101003001553044055322145351354433645660555433454202452204412052502421011342410230100
+331223314040220223001130433220004441042006330461143461335633613314213000015223153233240331142300012
+023102231103100342321215533524330225130560305625124623310126454152020030305335002210044012323422232
+033211114433402023241334421151326235424122515414424161565116453111213321055111200550233444040333323
+031320412113341012010242000135046256344463444305066152423440545620430235453525520134521220144043130
+010124340443212543345333321333301441655163125534010352005641320662142112543221425142532404413320002
+032312034332435412243231103121245340611134410006433546515216241603224333504015201503140034044432021
+320200344413202332231554246602660034061050643672316237416266543042042653101335352044243134331323303
+021300102204043340554035441662023251216477627653211774256145300615432406261511620233045011441203023
+214221412130421304035463335360514215534123522725272245137776312134526215216203521523534253001441422
+420043232030231215456256414206036653347362132153333156552344113453564204615313111314105214221003223
+241014245200324505163302204145552154121123441333614641654374366443635062610615660400505253511330311
+231411122124035056146223662646715423323763562152711313214722174623631122416546336265504022423420321
+042134415425335411142551632217112111473327114471514114442336163742155647750445640460531524541203340
+343034551205503142350464162224754743123535251535665351452621461253234473323031250306005520215303040
+410130220425226615062361272722422212213362652886842457443563446376627357725562240530656421332425231
+330405053401450540006525751276462213552438775622853762648444675762737115273314256401440500101434302
+304122334204441123350414175256673644342865574663385723585576354377456151273122601662220161301504112
+422435205014554545365735723436373233832475876524575872268832223848512552555643351604546205341424215
+443115513525431203264315523331217625862645482563537776356753567584283413472356644126410362312334123
+052022430460332345152212254167524466648262435238422282347263726486242532216231573303203326333131543
+404311335435645624675123354136583324744857778885726358668585255832473858653735421124234313332210004
+520111321123045340623442334624735877337545859497694367639273762375345722536177411211020042150153021
+411235141221544066661746224736774624232459373766373495575944484527562783724767432624400142054055522
+024120413051264413175435475422366266524638499844474853789334849464538454233333357361304324422613501
+352214454643240574661363763475756533743797783848433976887696359992333666675226733442545524354500443
+251345503313114376116272866687526585434388584575674356595674465655476743763543124147356110122024044
+133110654322616733231668722725373876835778466784566584387395434396884778345524117356166460636143351
+112230445513242554663324764556586867753674864468343933678664667973977485428425757277634522562064320
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day08/src/main.rs

@@ -0,0 +1,56 @@
+use std::env;
+use std::fs;
+
+fn main() {
+    let input = fs::read_to_string(&env::args().nth(1).unwrap()).unwrap();
+    let forest: Vec<Vec<i8>> = input.lines()
+        .map(|line| line.chars()
+            .map(|c| c.to_digit(10).unwrap() as i8).collect())
+        .collect();
+    let nrows = forest.len();
+    let ncols = forest[0].len();
+
+    let mut scores = vec![vec![1; ncols]; nrows];
+    for r in 1..nrows-1 {
+        for c in 1..ncols-1 {
+            let h = forest[r][c];
+
+            let mut j = c - 1;
+            let mut count = 0;
+            while j > 0 && forest[r][j] < h {
+                count += 1;
+                j -= 1;
+            }
+            scores[r][c] *= count + 1;
+
+            let mut j = c + 1;
+            let mut count = 0;
+            while j < ncols-1 && forest[r][j] < h {
+                count += 1;
+                j += 1;
+            }
+            scores[r][c] *= count + 1;
+
+            let mut i = r - 1;
+            let mut count = 0;
+            while i > 0 && forest[i][c] < h {
+                count += 1;
+                i -= 1;
+            }
+            scores[r][c] *= count + 1;
+
+            let mut i = r + 1;
+            let mut count = 0;
+            while i < nrows-1 && forest[i][c] < h {
+                count += 1;
+                i += 1;
+            }
+            scores[r][c] *= count + 1;
+
+        }
+    }
+
+    let answer = scores.iter().map(|row| row.iter().max()).max();
+    println!("{:?}", answer);
+}
+

day08/src/main1.rs

@@ -0,0 +1,59 @@
+use std::env;
+use std::fs;
+
+fn main() {
+    let input = fs::read_to_string(&env::args().nth(1).unwrap()).unwrap();
+    let forest: Vec<Vec<i8>> = input.lines()
+        .map(|line| line.chars()
+            .map(|c| c.to_digit(10).unwrap() as i8).collect())
+        .collect();
+    let nrows = forest.len();
+    let ncols = forest[0].len();
+
+    let min_from_left: Vec<Vec<i8>> = forest.iter()
+        .map(|row| row.iter()
+            .scan(-1, |h, &tree| {
+                let old = *h; *h = i8::max(*h as i8, tree); Some(old)
+            })
+            .collect())
+        .collect();
+
+    let min_from_right: Vec<Vec<i8>> = forest.iter()
+        .map(|row: &Vec<i8>| row.iter()
+            .rev()
+            .scan(-1, |h, &tree| {
+                let old = *h; *h = i8::max(*h as i8, tree); Some(old)
+            })
+            .collect::<Vec<i8>>().iter()
+            .rev().map(|x| *x)
+            .collect())
+        .collect();
+
+    let mut min_from_top: Vec<Vec<i8>> = vec![vec![-1; ncols]; nrows];
+    for c in 0..ncols {
+        for r in 1..nrows {
+            min_from_top[r][c] = i8::max(min_from_top[r-1][c], forest[r-1][c]);
+        }
+    } 
+
+    let mut min_from_bot: Vec<Vec<i8>> = vec![vec![-1; ncols]; nrows];
+    for c in 0..ncols {
+        for r in (0..nrows-1).rev() {
+            min_from_bot[r][c] = i8::max(min_from_bot[r+1][c], forest[r+1][c]);
+        }
+    } 
+
+    let mut sum = 0;
+    for r in 0..nrows {
+        for c in 0..ncols {
+            if forest[r][c] > min_from_left[r][c]
+                || forest[r][c] > min_from_right[r][c]
+                || forest[r][c] > min_from_top[r][c]
+                || forest[r][c] > min_from_bot[r][c] {
+                sum += 1;
+            }
+        }
+    }
+    println!("{:?}", sum);
+}
+

day08/test.txt

@@ -0,0 +1,5 @@
+30373
+25512
+65332
+33549
+35390

day09/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day9"
+version = "0.1.0"

day09/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day9"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day09/src/main.rs

@@ -0,0 +1,49 @@
+use std::env;
+use std::fs::File;
+use std::io::{self, BufRead};
+use std::collections::HashSet;
+
+fn main() {
+    let file = File::open(&env::args().nth(1).unwrap()).unwrap();
+    let reader = io::BufReader::new(file);
+    let mut rope: [(i64, i64); 10] = [(0, 0); 10];
+    let mut visited: HashSet<(i64, i64)> = vec![(0, 0)].into_iter().collect();
+
+    for line in reader.lines().flatten() {
+        let ((movx, movy), count) = parse_line(line).unwrap();
+        for _ in 0..count {
+            rope[0] = (rope[0].0 + movx, rope[0].1 + movy);
+            for link in 1..=9 {
+                rope[link] = move_tail(rope[link - 1], rope[link]);
+            }
+            visited.insert(rope[9]);
+        }
+    }
+    println!("{:?}", visited.len());
+}
+
+fn parse_line(line: String) -> Option<((i64, i64), i64)> {
+    let mov = match line.chars().nth(0) {
+        Some('L') => Some((-1, 0)),
+        Some('R') => Some((1, 0)),
+        Some('U') => Some((0, -1)),
+        Some('D') => Some((0, 1)),
+        _ => None,
+    };
+    let count = line[2..].parse::<i64>();
+    match (mov, count) {
+        (Some(mov), Ok(count)) => Some((mov, count)),
+        _ => None,
+    }
+}
+
+fn move_tail((hx, hy): (i64, i64), (tx, ty): (i64, i64)) -> (i64, i64) {
+    let dx = if hx > tx { 1 } else { -1 };
+    let dy = if hy > ty { 1 } else { -1 };
+    match (hx - tx, hy - ty) {
+        (-1..=1, -1..=1) => (tx, ty),
+        (-1..=1, _) => (hx, ty + dy),
+        (_, -1..=1) => (tx + dx, hy),
+        (_, _) => (tx + dx, ty + dy),
+    }
+}

day09/src/main1.rs

@@ -0,0 +1,39 @@
+use std::env;
+use std::fs::File;
+use std::io::{self, BufRead};
+use std::collections::HashSet;
+
+fn main() {
+    let file = File::open(&env::args().nth(1).unwrap()).unwrap();
+    let reader = io::BufReader::new(file);
+    let (mut hx, mut hy, mut tx, mut ty) = (0, 0, 0, 0);
+    let mut visited: HashSet<(i64, i64)> = vec![(0, 0)].into_iter().collect();
+
+    for line in reader.lines().flatten() {
+        let (movx, movy) = match line.chars().nth(0) {
+            Some('L') => (-1, 0),
+            Some('R') => (1, 0),
+            Some('U') => (0, -1),
+            Some('D') => (0, 1),
+            _ => (999, 999),
+        };
+        let count = line[2..].parse::<i64>().unwrap();
+        for _ in 0..count {
+            (hx, hy) = (hx + movx, hy + movy);
+            (tx, ty) = move_tail(hx, hy, tx, ty).unwrap();
+            visited.insert((tx, ty));
+        }
+    }
+    println!("{:?}", visited.len());
+}
+
+fn move_tail(hx: i64, hy: i64, tx: i64, ty: i64) -> Option<(i64, i64)> {
+    match (hx - tx, hy - ty) {
+        (-1..=1, -1..=1) => Some((tx, ty)),
+        (-1..=1, 2) => Some((hx, ty + 1)),
+        (-1..=1, -2) => Some((hx, ty - 1)),
+        (2, -1..=1) => Some((tx + 1, hy)),
+        (-2, -1..=1) => Some((tx - 1, hy)),
+        _ => None
+    }
+}

day09/test.txt

@@ -0,0 +1,8 @@
+R 4
+U 4
+L 3
+D 1
+R 4
+D 1
+L 5
+R 2

day09/test2.txt

@@ -0,0 +1,8 @@
+R 5
+U 8
+L 8
+D 3
+R 17
+D 10
+L 25
+U 20

day10/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day10"
+version = "0.1.0"

day10/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day10"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day10/input.txt

@@ -0,0 +1,143 @@
+noop
+noop
+addx 5
+noop
+noop
+addx 6
+addx 4
+addx -4
+addx 4
+addx -6
+addx 11
+addx -1
+addx 2
+addx 4
+addx 3
+noop
+addx 2
+addx -30
+addx 2
+addx 33
+noop
+addx -37
+noop
+noop
+noop
+addx 3
+addx 2
+addx 5
+addx 20
+addx 7
+addx -24
+addx 2
+noop
+addx 7
+addx -2
+addx -6
+addx 13
+addx 3
+addx -2
+addx 2
+noop
+addx -5
+addx 10
+addx 5
+addx -39
+addx 1
+addx 5
+noop
+addx 3
+noop
+addx -5
+addx 10
+addx -2
+addx 2
+noop
+noop
+addx 7
+noop
+noop
+noop
+noop
+addx 3
+noop
+addx 3
+addx 2
+addx 8
+addx -1
+addx -20
+addx 21
+addx -38
+addx 5
+addx 2
+noop
+noop
+noop
+addx 8
+noop
+noop
+addx -2
+addx 2
+addx -7
+addx 14
+addx 5
+noop
+noop
+noop
+addx -16
+addx 17
+addx 2
+addx -12
+addx 19
+noop
+noop
+addx -37
+noop
+noop
+noop
+addx 3
+addx 2
+addx 2
+addx 5
+addx 20
+addx -19
+addx 2
+noop
+noop
+noop
+addx 5
+addx 19
+addx -12
+addx 3
+addx -2
+addx 2
+addx -18
+addx 25
+addx -14
+addx -22
+addx 1
+noop
+noop
+noop
+addx 3
+addx 5
+addx -4
+addx 7
+addx 4
+noop
+addx 1
+noop
+noop
+addx 2
+addx -6
+addx 15
+addx -1
+addx 4
+noop
+noop
+addx 1
+addx 4
+addx -33
+noop
+addx 21
+noop

day10/src/main.rs

@@ -0,0 +1,50 @@
+use std::num;
+use std::env;
+use std::process;
+use std::fs::File;
+use std::io::{self, BufRead};
+
+#[derive(Debug)]
+enum Inst{
+    AddX(i64),
+    Noop,
+}
+
+#[derive(Debug)]
+struct ParseError(String);
+impl From<num::ParseIntError> for ParseError {
+    fn from(e: num::ParseIntError) -> Self {
+        ParseError(e.to_string())
+    }
+}
+
+fn parse_line(line: String) -> Result<Inst, ParseError> {
+    match &line[..4] {
+        "noop" => Ok(Inst::Noop),
+        "addx" => Ok(Inst::AddX(line[5..].parse::<i64>()?)),
+        _ => Err(ParseError(String::from("bad instruction"))),
+    }
+}
+
+fn main() {
+    let file = File::open(&env::args().nth(1).unwrap()).unwrap();
+    let reader = io::BufReader::new(file);
+    let mut xs: Vec<i64> = vec![1];
+
+    for line in reader.lines().flatten() {
+        let last_x = *xs.last().unwrap();
+        match parse_line(line) {
+            Ok(Inst::Noop) => { xs.push(last_x) },
+            Ok(Inst::AddX(x)) => { xs.push(last_x); xs.push(last_x + x) },
+            Err(e) => { eprintln!("error: {:?}", e); process::exit(1) },
+        }
+    }
+
+    let screen: Vec<_> = xs.iter().enumerate()
+        .map(|(i, &x)| if ((i as i64) % 40 - x).abs() <= 1 { '#' } else { '.' })
+        .collect();
+    for i in 0..6 {
+        println!("{}", screen[(i*40)..((i+1)*40)].iter().collect::<String>());
+    }
+}
+

day10/src/main1.rs

@@ -0,0 +1,45 @@
+use std::env;
+use std::process;
+use std::fs::File;
+use std::io::{self, BufRead};
+
+#[derive(Debug)]
+enum Inst{
+    AddX(i64),
+    Noop,
+}
+
+#[derive(Debug)]
+struct ParseError(String);
+
+fn parse_line(line: String) -> Result<Inst, ParseError> {
+    match &line[..4] {
+        "noop" => Ok(Inst::Noop),
+        "addx" => match line[5..].parse::<i64>() {
+            Ok(operand) => Ok(Inst::AddX(operand)),
+            Err(e) => Err(ParseError(e.to_string())),
+        },
+        _ => Err(ParseError(String::from("bad instruction"))),
+    }
+}
+
+fn main() {
+    let file = File::open(&env::args().nth(1).unwrap()).unwrap();
+    let reader = io::BufReader::new(file);
+    let mut xs: Vec<i64> = vec![0, 1];
+
+    for line in reader.lines().flatten() {
+        let last_x = *xs.last().unwrap();
+        match parse_line(line) {
+            Ok(Inst::Noop) => { xs.push(last_x) },
+            Ok(Inst::AddX(x)) => { xs.push(last_x); xs.push(last_x + x) },
+            Err(e) => { eprintln!("error: {:?}", e); process::exit(1) },
+        }
+    }
+    let res: i64 = xs.iter().enumerate()
+        .skip(20).step_by(40)
+        .map(|(i, &x)| (i as i64)*x)
+        .sum();
+    println!("{:?}", res);
+}
+

day10/test.txt

@@ -0,0 +1,146 @@
+addx 15
+addx -11
+addx 6
+addx -3
+addx 5
+addx -1
+addx -8
+addx 13
+addx 4
+noop
+addx -1
+addx 5
+addx -1
+addx 5
+addx -1
+addx 5
+addx -1
+addx 5
+addx -1
+addx -35
+addx 1
+addx 24
+addx -19
+addx 1
+addx 16
+addx -11
+noop
+noop
+addx 21
+addx -15
+noop
+noop
+addx -3
+addx 9
+addx 1
+addx -3
+addx 8
+addx 1
+addx 5
+noop
+noop
+noop
+noop
+noop
+addx -36
+noop
+addx 1
+addx 7
+noop
+noop
+noop
+addx 2
+addx 6
+noop
+noop
+noop
+noop
+noop
+addx 1
+noop
+noop
+addx 7
+addx 1
+noop
+addx -13
+addx 13
+addx 7
+noop
+addx 1
+addx -33
+noop
+noop
+noop
+addx 2
+noop
+noop
+noop
+addx 8
+noop
+addx -1
+addx 2
+addx 1
+noop
+addx 17
+addx -9
+addx 1
+addx 1
+addx -3
+addx 11
+noop
+noop
+addx 1
+noop
+addx 1
+noop
+noop
+addx -13
+addx -19
+addx 1
+addx 3
+addx 26
+addx -30
+addx 12
+addx -1
+addx 3
+addx 1
+noop
+noop
+noop
+addx -9
+addx 18
+addx 1
+addx 2
+noop
+noop
+addx 9
+noop
+noop
+noop
+addx -1
+addx 2
+addx -37
+addx 1
+addx 3
+noop
+addx 15
+addx -21
+addx 22
+addx -6
+addx 1
+noop
+addx 2
+addx 1
+noop
+addx -10
+noop
+noop
+addx 20
+addx 1
+addx 2
+addx 2
+addx -6
+addx -11
+noop
+noop
+noop

day11/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day11"
+version = "0.1.0"

day11/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day11"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day11/input.txt

@@ -0,0 +1,55 @@
+Monkey 0:
+  Starting items: 66, 79
+  Operation: new = old * 11
+  Test: divisible by 7
+    If true: throw to monkey 6
+    If false: throw to monkey 7
+
+Monkey 1:
+  Starting items: 84, 94, 94, 81, 98, 75
+  Operation: new = old * 17
+  Test: divisible by 13
+    If true: throw to monkey 5
+    If false: throw to monkey 2
+
+Monkey 2:
+  Starting items: 85, 79, 59, 64, 79, 95, 67
+  Operation: new = old + 8
+  Test: divisible by 5
+    If true: throw to monkey 4
+    If false: throw to monkey 5
+
+Monkey 3:
+  Starting items: 70
+  Operation: new = old + 3
+  Test: divisible by 19
+    If true: throw to monkey 6
+    If false: throw to monkey 0
+
+Monkey 4:
+  Starting items: 57, 69, 78, 78
+  Operation: new = old + 4
+  Test: divisible by 2
+    If true: throw to monkey 0
+    If false: throw to monkey 3
+
+Monkey 5:
+  Starting items: 65, 92, 60, 74, 72
+  Operation: new = old + 7
+  Test: divisible by 11
+    If true: throw to monkey 3
+    If false: throw to monkey 4
+
+Monkey 6:
+  Starting items: 77, 91, 91
+  Operation: new = old * old
+  Test: divisible by 17
+    If true: throw to monkey 1
+    If false: throw to monkey 7
+
+Monkey 7:
+  Starting items: 76, 58, 57, 55, 67, 77, 54, 99
+  Operation: new = old + 6
+  Test: divisible by 3
+    If true: throw to monkey 2
+    If false: throw to monkey 1

day11/src/main.rs

@@ -0,0 +1,162 @@
+use std::num::ParseIntError;
+use std::env;
+use std::fs::File;
+use std::io::{self, BufRead, Lines};
+use std::collections::VecDeque;
+
+#[derive(Debug)]
+enum Operator { Add, Mul }
+#[derive(Debug)]
+enum Operand { Old, Imm(u64) }
+
+#[derive(Debug)]
+struct Operation { left: Operand, op: Operator, right: Operand }
+impl Operation {
+    fn perform(&self, old: u64) -> u64 {
+        let left = match self.left {
+            Operand::Old => old,
+            Operand::Imm(x) => x,
+        };
+        let right = match self.right {
+            Operand::Old => old,
+            Operand::Imm(x) => x,
+        };
+        match self.op {
+            Operator::Add => left + right,
+            Operator::Mul => left * right,
+        }
+    }
+}
+
+#[derive(Debug)]
+struct Monkey {
+    id: u64,
+    items: VecDeque<u64>,
+    operation: Operation,
+    div_by_test: u64,
+    true_throw: u64,
+    false_throw: u64,
+}
+
+#[derive(Debug)]
+enum MonkeyError {
+    ParseError(),
+    ParseIntError(ParseIntError),
+    IoError(io::Error),
+}
+impl From<ParseIntError> for MonkeyError {
+    fn from(e: ParseIntError) -> Self { MonkeyError::ParseIntError(e) }
+}
+impl From<io::Error> for MonkeyError {
+    fn from(e: io::Error) -> Self { MonkeyError::IoError(e) }
+}
+
+fn parse_monkey<B: BufRead>(
+    lines: &mut Lines<B>
+) -> Result<Option<Monkey>, MonkeyError> {
+    let id = match lines.next() {
+        Some(line) => line?
+            .strip_prefix("Monkey ").ok_or(MonkeyError::ParseError())?
+            .strip_suffix(":").ok_or(MonkeyError::ParseError())?
+            .parse::<u64>()?,
+        None => return Ok(None),
+    };
+
+    let starting_items = lines.next().ok_or(MonkeyError::ParseError())??
+        .strip_prefix("  Starting items: ").ok_or(MonkeyError::ParseError())?
+        .split(", ")
+        .map(|item| item.parse::<u64>())
+        .collect::<Result<VecDeque<_>, _>>()?;
+
+    let op_line = lines.next().ok_or(MonkeyError::ParseError())??;
+    let op_vec = op_line
+        .strip_prefix("  Operation: new = ").ok_or(MonkeyError::ParseError())?
+        .split(' ').collect::<Vec<_>>();
+    let (left, operator, right) = (op_vec[0], op_vec[1], op_vec[2]);
+    let operation = Operation {
+        left: match left {
+            "old" => Operand::Old,
+            _ => Operand::Imm(left.parse()?)
+        },
+        op: match operator {
+            "+" => Ok(Operator::Add),
+            "*" => Ok(Operator::Mul),
+            _ => Err(MonkeyError::ParseError())
+        }?,
+        right: match right {
+            "old" => Operand::Old,
+            _ => Operand::Imm(right.parse()?)
+        },
+    };
+        
+    let test_val = lines.next().ok_or(MonkeyError::ParseError())??
+        .strip_prefix("  Test: divisible by ").ok_or(MonkeyError::ParseError())?
+        .parse::<u64>()?;
+
+    let true_throw = lines.next().ok_or(MonkeyError::ParseError())??
+        .strip_prefix("    If true: throw to monkey ")
+        .ok_or(MonkeyError::ParseError())?
+        .parse::<u64>()?;
+    let false_throw = lines.next().ok_or(MonkeyError::ParseError())??
+        .strip_prefix("    If false: throw to monkey ")
+        .ok_or(MonkeyError::ParseError())?
+        .parse::<u64>()?;
+
+    // Remove empty line if exists
+    match lines.next() {
+        None => Ok(()),
+        Some(Err(e)) => Err(e),
+        Some(Ok(s)) => Ok(match s.as_str() {
+            "" => Ok(()),
+            _ => Err(MonkeyError::ParseError()),
+        }?),
+    }?;
+
+    Ok(Some(Monkey {
+        id: id,
+        items: starting_items,
+        operation: operation,
+        div_by_test: test_val,
+        true_throw: true_throw,
+        false_throw: false_throw,
+    })
+)}
+
+fn main() {
+    let file = File::open(&env::args().nth(1).unwrap()).unwrap();
+    let mut lines = io::BufReader::new(file).lines();
+    let mut monkeys: Vec<Monkey> = Vec::new();
+
+    loop {
+        match parse_monkey(&mut lines) {
+            Ok(None) => break,
+            Ok(Some(m)) => {
+                assert!(m.id == monkeys.len() as u64);
+                monkeys.push(m)
+            },
+            Err(e) => eprintln!("{:?}", e),
+        }
+    }
+    let mut monkey_item_counts = vec![0; monkeys.len()];
+    let lcd = monkeys.iter().fold(1, |acc, m| acc * m.div_by_test);
+
+    for _round in 1..=10000 {
+        for i in 0..monkeys.len() {
+            monkey_item_counts[i] += monkeys[i].items.len();
+
+            for _item in 0..monkeys[i].items.len() {
+                let old_item = monkeys[i].items.pop_front().unwrap();
+                let new_item = monkeys[i].operation.perform(old_item) % lcd;
+                let new_i = if new_item % monkeys[i].div_by_test == 0 {
+                    monkeys[i].true_throw
+                } else {
+                    monkeys[i].false_throw
+                } as usize;
+                monkeys[new_i].items.push_back(new_item);
+            }
+        }
+    }
+    monkey_item_counts.sort_by(|x, y| y.cmp(x));
+    println!("{:?}", monkey_item_counts[0]*monkey_item_counts[1]);
+}
+

day11/src/main1.rs

@@ -0,0 +1,158 @@
+use std::num::ParseIntError;
+use std::env;
+use std::fs::File;
+use std::io::{self, BufRead, Lines};
+use std::collections::VecDeque;
+
+#[derive(Debug)]
+enum Operator { Add, Mul }
+#[derive(Debug)]
+enum Operand { Old, Imm(u64) }
+
+#[derive(Debug)]
+struct Operation { left: Operand, op: Operator, right: Operand }
+impl Operation {
+    fn perform(&self, old: u64) -> u64 {
+        let left = match self.left {
+            Operand::Old => old,
+            Operand::Imm(x) => x,
+        };
+        let right = match self.right {
+            Operand::Old => old,
+            Operand::Imm(x) => x,
+        };
+        match self.op {
+            Operator::Add => left + right,
+            Operator::Mul => left * right,
+        }
+    }
+}
+
+#[derive(Debug)]
+struct Monkey {
+    id: u64,
+    items: VecDeque<u64>,
+    operation: Operation,
+    div_by_test: u64,
+    true_throw: u64,
+    false_throw: u64,
+}
+
+#[derive(Debug)]
+enum MonkeyError {
+    ParseError(),
+    ParseIntError(ParseIntError),
+    IoError(io::Error),
+}
+impl From<ParseIntError> for MonkeyError {
+    fn from(e: ParseIntError) -> Self { MonkeyError::ParseIntError(e) }
+}
+impl From<io::Error> for MonkeyError {
+    fn from(e: io::Error) -> Self { MonkeyError::IoError(e) }
+}
+
+fn parse_monkey<B: BufRead>(
+    lines: &mut Lines<B>
+) -> Result<Option<Monkey>, MonkeyError> {
+    let id = match lines.next() {
+        Some(line) => line?
+            .strip_prefix("Monkey ").ok_or(MonkeyError::ParseError())?
+            .strip_suffix(":").ok_or(MonkeyError::ParseError())?
+            .parse::<u64>()?,
+        None => return Ok(None),
+    };
+
+    let starting_items = lines.next().ok_or(MonkeyError::ParseError())??
+        .strip_prefix("  Starting items: ").ok_or(MonkeyError::ParseError())?
+        .split(", ")
+        .map(|item| item.parse::<u64>())
+        .collect::<Result<VecDeque<_>, _>>()?;
+
+    let op_line = lines.next().ok_or(MonkeyError::ParseError())??;
+    let op_vec = op_line
+        .strip_prefix("  Operation: new = ").ok_or(MonkeyError::ParseError())?
+        .split(' ').collect::<Vec<_>>();
+    let (left, operator, right) = (op_vec[0], op_vec[1], op_vec[2]);
+    let operation = Operation {
+        left: match left {
+            "old" => Operand::Old,
+            _ => Operand::Imm(left.parse()?)
+        },
+        op: match operator {
+            "+" => Ok(Operator::Add),
+            "*" => Ok(Operator::Mul),
+            _ => Err(MonkeyError::ParseError())
+        }?,
+        right: match right {
+            "old" => Operand::Old,
+            _ => Operand::Imm(right.parse()?)
+        },
+    };
+        
+    let test_val = lines.next().ok_or(MonkeyError::ParseError())??
+        .strip_prefix("  Test: divisible by ").ok_or(MonkeyError::ParseError())?
+        .parse::<u64>()?;
+
+    let true_throw = lines.next().ok_or(MonkeyError::ParseError())??
+        .strip_prefix("    If true: throw to monkey ")
+        .ok_or(MonkeyError::ParseError())?
+        .parse::<u64>()?;
+    let false_throw = lines.next().ok_or(MonkeyError::ParseError())??
+        .strip_prefix("    If false: throw to monkey ")
+        .ok_or(MonkeyError::ParseError())?
+        .parse::<u64>()?;
+
+    // Remove empty line if exists
+    match lines.next() {
+        None => Ok(()),
+        Some(Err(e)) => Err(e),
+        Some(Ok(s)) => Ok(match s.as_str() {
+            "" => Ok(()),
+            _ => Err(MonkeyError::ParseError()),
+        }?),
+    }?;
+
+    Ok(Some(Monkey {
+        id: id,
+        items: starting_items,
+        operation: operation,
+        div_by_test: test_val,
+        true_throw: true_throw,
+        false_throw: false_throw,
+    })
+)}
+
+fn main() {
+    let file = File::open(&env::args().nth(1).unwrap()).unwrap();
+    let mut lines = io::BufReader::new(file).lines();
+    let mut monkeys: Vec<Monkey> = Vec::new();
+
+    loop {
+        match parse_monkey(&mut lines) {
+            Ok(None) => break,
+            Ok(Some(m)) => { assert!(m.id == monkeys.len() as u64); monkeys.push(m) },
+            Err(e) => eprintln!("{:?}", e),
+        }
+    }
+    let mut monkey_item_counts = vec![0; monkeys.len()];
+
+    for _round in 1..=20 {
+        for i in 0..monkeys.len() {
+            monkey_item_counts[i] += monkeys[i].items.len();
+
+            for _item in 0..monkeys[i].items.len() {
+                let old_item = monkeys[i].items.pop_front().unwrap();
+                let new_item = monkeys[i].operation.perform(old_item) / 3;
+                let new_i = if new_item % monkeys[i].div_by_test == 0 {
+                    monkeys[i].true_throw
+                } else {
+                    monkeys[i].false_throw
+                } as usize;
+                monkeys[new_i].items.push_back(new_item);
+            }
+        }
+    }
+    monkey_item_counts.sort_by(|x, y| y.cmp(x));
+    println!("{:?}", monkey_item_counts[0]*monkey_item_counts[1]);
+}
+

day11/test.txt

@@ -0,0 +1,27 @@
+Monkey 0:
+  Starting items: 79, 98
+  Operation: new = old * 19
+  Test: divisible by 23
+    If true: throw to monkey 2
+    If false: throw to monkey 3
+
+Monkey 1:
+  Starting items: 54, 65, 75, 74
+  Operation: new = old + 6
+  Test: divisible by 19
+    If true: throw to monkey 2
+    If false: throw to monkey 0
+
+Monkey 2:
+  Starting items: 79, 60, 97
+  Operation: new = old * old
+  Test: divisible by 13
+    If true: throw to monkey 1
+    If false: throw to monkey 3
+
+Monkey 3:
+  Starting items: 74
+  Operation: new = old + 3
+  Test: divisible by 17
+    If true: throw to monkey 0
+    If false: throw to monkey 1

day12/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day12"
+version = "0.1.0"

day12/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day12"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day12/input.txt

@@ -0,0 +1,41 @@
+abcccccccccccaaaaacccccccaaaaaaccccccccccccccccccccccccccccccccaaaaaaaaaaaaaacccccccccccccccccccaaaaaacccccccacccccccccaaccaaccccccccccccccccccccccccccccccaaaaaa
+abcccccccccccaaaaaaacccccaaaaaaccccccccaaccccccccccaaaaccccccccaaaaaaaaaaaaaccccccccccccccccccccaaaaaaccccaaaacccccccccaaaaaaccccccccccccccccccccccccccccccccaaaa
+abccccccccccaaaaaaaacccccaaaaaccccccccaaaacccccccccaaaacccccccccccaaaaaaacccccccccccccccccccccccaaaaacccccaaaaaaccccccccaaaaacccccccccccaaaccccccccccccccccccaaaa
+abccccccccccaaaaaaaaccccccaaaaacccccccaaaacccccccccaaaacccccaaaccccaaaaaaccccccccccccccccccccccccaaaaacccccaaaaacccccccaaaaaacccccccccccaaaacccccccccccccccccaaaa
+abccccccccccaaaaaaccccccccaaaaacccccccaaaaccccccccccaaacccccaaaaccaaaaaaaacccccccccccccccccccccccaaaaaccccaaaaacccccccaaaaaaaaccccccccccaaaaccaaccccccccccccaaaaa
+abcccccccccccccaaaccccccccccccccccccccccccccccccccccccccccccaaaaccaaaaaaaaccccccccccccccccccccccccccccccccaccaaccccaaaaaaaaaaacccccccccccaaaaaaccccccccccccccaccc
+abcacccccccccccccaaaccccccccccccccaaacccccccccccccccccccccccaaaccaaaacccaaacccccccccccccccccccccccaacccccccccccccccaaacccaaccccccccccccccaaaalllllccccccccccccccc
+abaacccccccccccccaaaaaacccccccccccaaaccccccccccccccccccccccccccccaaaccccaaaccccccccccccccccccccccaaccccccccccccccccaaaaaaaaccccccccccccccckklllllllccccaaaccccccc
+abaaaaacccccccccaaaaaaacccccccccaaaaaaaacccccaacccccccccccccccccccccccccaaaccccccccaacccccccccaaaaacaacaacaacccccaaaaaaaaccccccccccccaaakkkkllllllllcccaaaccccccc
+abaaaaaccccccccaaaaaaaacccccccccaaaaaaaacccccaaaaaacccccccccccccccccccccaaaccccccaaaacacccccccaaaaaaaacaaaaaccccaaaaaaaaaccccccccckkkkkkkkkklsssslllcccaaaaaacccc
+abaaaccccccccccaaaaaaacccccccccccaaaaacccccccaaaaaaccccccccccccccccccaaaaaaaaccccaaaaaacccccccccaaaaacaaaaacccccaaaaaaaacccaaaccjjkkkkkkkkkssssssslllcccaaaaacccc
+abaaaccccccccccccaaaaaacccccaacccaaaaaaccccaaaaaaaccaaaccccccccccccccaaaaaaaacccccaaaacccccccccaaaaaccaaaaaacccccccaaaaaaccaaaajjjjkkkkkkssssssssslllcddaaaaccccc
+abcaaacccccccccccaaaaaacaaacaacccaaaaaaccccaaaaaaaaaaaaaaccccccccccccccaaaaaccccccaaaaccccaaaaaaacaaacccaaaaaaacccaaaaaaaccaaajjjjrrrrrrssssuuuussqmmddddaaaccccc
+abccaacccccccccccaaccccccaaaaacccaaaccaccccaaaaaaaaaaaaaacccccccccccccaaaaaacccccaacaaccccaaaaacccaaccccacccaaaaaaaaaccaaccaaajjjrrrrrrrrssuuuuuvqqmmmdddaaaccccc
+abccccccccaaccccccccccccccaaaaaacccccccccccccaaaaaaaaaaaccccccccccccccaaaaaacccccccccccccaaaaaaccccccccccccaaaaaaaaaacccccccccjjjrrruuuuuuuuuuuvvqqmmmmddddaccccc
+abaacccccaaaaccccccccccccaaaaaaacccccccccccccaacccccaaaaacccccccccccccaccaaacccccccccccccaaaaaacccccccccccaaaaaaaaccccccccccccjjjrrruuuuuuuuxyyvvqqqmmmddddcccccc
+abaacccccaaaacccccccccccaaaaaaccccccccaaccccccccacccaaaaacccccccccccccccccccccccccccccccccaaaaacccccccccccaaaaaaacccccccccccccjjjrrttuxxxxuxxyyvvqqqqmmmmddddcccc
+abaacccccaaaacccccccccccaacaaacccccaaaaacccaaaaaaaccccccccccccccccccccccccccccccccccccccccaaacccccccccccccccaaaaaaccccccccccccjjjrrtttxxxxxxyyyvvqqqqqmmmmdddcccc
+abacccccccccccccccccccccccccaaccccccaaaaaccaaaaaaaccccccccaaccccccccccccccccccccccccccccccccccccccccccccccccaaaaaaccccccccccccjjjqrrttxxxxxxyyyvvvvqqqqmmmdddcccc
+abccccccccccccccccccccccccccccccccccaaaaaccaaaaaaacccccccaaaccccccccccaaaccccccccccccccccccaaaccccccccccccccaaccccccccccaaccccjjjqqqtttxxxxxyyyyyvvvqqqqmmmeeeccc
+SbaaccccccaccaaacccccccccccccccccccaaaaacccaaaaaaaaccccaaaaaaaacccccccaaacaaccccccccccccccaaaaaaccccccccccccccccccccccaaaaaaccciiiqqqttxxxxEzyyyyyvvvqqqnnneeeccc
+abaaccccccaaaaaaccccccccccccccccccccccaaccaaaaaaaaaacccaaaaaaaacccccaaaaaaaaccccccccccccccaaaaaaccccccccccccccccccccccaaaaaaccciiiqqtttxxxyyyyyyyvvvvqqqnnneeeccc
+abaaaaacccaaaaaaccccccccccccccccccccccccccaaaaaaaaaaccccaaaaaaccccccaaaaaaaaccccccccccccccaaaaaacccccccccccccccccccccccaaaaacciiiqqqttxxyyyyyyywvvvvrrrqnnneeeccc
+abaaaaacccaaaaaaaccccccccaaaccccccccccccccaacaaaccccccccaaaaaaccccccaaaaaaaccccccccccccccccaaaaaccccccccccccccccccccccaaaaaccciiiqqtttxxxyyyyywwwvrrrrrnnneeecccc
+abaaaccccaaaaaaaaccccccccaaaacccccccccccccccccaaccccccccaaaaaaccccccccaaaaaccccccccccccccccaacaaccccccccccccccccccccccaaaaaccciiqqqttxxxwwwwyyywwrrrrnnnnneeecccc
+abaaaccccaaaaaaaaccccccccaaaacccccaaaaacccccccaaccccccccaaccaacccccccaaacaaacccccccccccccccccccccccccccccccccccccccccccccccccciiqqqtttwwwwwwywwwrrrrnnnnneeeccccc
+abcaaaccccccaaaccccccccccaaaccccccaaaaacccccccccccccaaaaccccccccccccccaacccccccccccccccccccccccccccccccaaaacccccccccccccccccciiiqqqtttssssswwwwwrrrnnnneeeecccccc
+abccaaccccccaaaccccccccccccccccccaaaaaacccccccccccccaaaaccccccccccccccccccccccccccccccccccccccccccccccaaaaacccccccccccccccccciiiqqqqtssssssswwwwrronnnfeeeacccccc
+abcccccccccccccccccccccccccccccccaaaaaacccccccccccccaaaaccccccccccccccccccccccccccccccccccccccccccccccaaaaaaccccccccccccccccciiiiqqppssssssswwwwrroonfffeaacccccc
+abcccccccccccccccccccccccccccccccaaaaaacaaaccccccccccaacccccccccccccccccccccccccccccccccaaacccccccccccaaaaaaccccccccccccccccccihhpppppppppsssssrrroonfffaaaaacccc
+abcccccccccccccccccccccccccccccccccaacccaaaaacccccccccccccccccccccccccccccccccccccccccccaaaaaaccccccccaaaaaccccccccccccccccccchhhhppppppppppssssrooofffaaaaaacccc
+abccccccccaaaccccccccccccccccccccccccccaaaaacccccccccccccccccccccccccccccccccccccaccccaaaaaaaaccccccccccaaacccccccccccccccccccchhhhhhhhhpppposssoooofffaaaaaccccc
+abccccccccaaaacccccaaccccccccccccccccccaaaaaccccccccccccccccccccccccaaccccccccccaaccccaaaaaaaacccccccccccccccccccccccccccccccccchhhhhhhhhgppooooooofffaaaaacccccc
+abaaccccccaaaacccccaacaaccccccccccccccccaaaaacccccccccccccccaacaaccaaaaaaccccaaaaacaacaaaaaaacccccccccccccccccccccccccccccccccccccchhhhhhgggooooooffffaaaaaaccccc
+abaaacccccaaaacccccaaaaaccccccccccccccccaaccccccccccccccccccaaaaaccaaaaaaccccaaaaaaaacccaaaaaccccccccccccccccccccccccaaacaacccccccccccccgggggooooffffccccaacccccc
+abaaaccccccccccccaaaaaaccccaaccccccccccccccccccaaacccccccccccaaaaaaaaaaaacaacccaaaaaccccaacaaacccccccccccccccccccccccaaaaaaccccccccccccccaggggggggfffcccccccccccc
+abaaaccccccccccccaaaaaaaacaaaaccccccccaaaccccccaaaacccccccccaaaaaaaaaaaaaaaaccaaaaacccccaaaaaccccccccccccccaaccccccccaaaaaaccccccccccccccaagggggggfccccccccccccca
+abaacccccccccccccaccaaaaacaaaaccccccccaaaccccccaaaacccccccccaaaaccaaaaaaaaaaccaacaaaccccccaaaccccccccccccaaaaaacccccaaaaaaacccccccccccccaaaaccggggcccccccccccccaa
+abaacccccccccccccccaaacaccaaaacccccaaaaaaaaccccaaaccccccccccccaaccaaaaaaaacccccccaacccccaacaaaaacccccccccaaaaaacccccaaaaaaaaccccccccccccaaaccccccccccccccccaaacaa
+abcccccccccccccccccaaccccccccccccccaaaaaaaaccccccccccccccccccccaaaaaaaaaaaccccccccccccccaaaaaaaacccccccccaaaaaacccccaaaaaaaaccccccccccccacaccccccccccccccccaaaaaa
+abccccccccccccccccccccccccccccccccccaaaaaacccccccccccccccccccccaaaaaaaaaaaaccccccccccccccaaaaaaccccccccccaaaaaccccccccaaacccccccccccccccccccccccccccccccccccaaaaa

day12/src/main.rs

@@ -0,0 +1,86 @@
+use std::env;
+use std::fs::File;
+use std::io::{self, BufRead};
+use std::collections::BinaryHeap;
+use std::cmp::max;
+
+fn get(map: &Vec<Vec<i64>>, coord: (usize, usize)) -> i64 {
+    map[coord.0 as usize][coord.1 as usize]
+}
+
+fn main() {
+    let file = File::open(&env::args().nth(1).unwrap()).unwrap();
+    let mut map: Vec<Vec<i64>> = Vec::new();
+    let mut queue = BinaryHeap::new();
+    let mut end = (0, 0);
+    let mut starts: Vec<(usize, usize)> = Vec::new();
+
+    // parse input
+    for (i, line) in io::BufReader::new(file).lines().flatten().enumerate() {
+        let mut row: Vec<i64> = Vec::new();
+        for (j, c) in line.chars().enumerate() {
+            match c {
+                'S' | 'a' => { starts.push((i, j)); row.push('a' as i64); },
+                'E' => { end = (i, j); row.push('z' as i64); },
+                c => row.push(c as i64),
+            }
+        }
+        map.push(row);
+    }
+    let (height, width) = (map.len(), map[0].len());
+    let mut costs = vec![vec![i64::MAX; width]; height];
+    let heur: Vec<Vec<i64>> = (0..height)
+        .map(|i| (0..width)
+            .map(|j|
+                max((i.abs_diff(end.0) + j.abs_diff(end.1)) as i64,
+                    get(&map, end) - get(&map, (i, j))))
+            .collect())
+        .collect();
+
+    for start in starts.iter() {
+        queue.push((-heur[start.0][start.1], *start));
+        costs[start.0][start.1] = 0;
+    }
+
+    // A*
+    let answer = loop {
+        // no route
+        if queue.is_empty() {
+            break None;
+        }
+
+        let (_, (i, j)) = queue.pop().unwrap();
+        let cost = get(&costs, (i, j));
+
+        // found destination
+        if (i, j) == end {
+            break Some(cost);
+        }
+
+        // handle neighbors
+        let neighbors = [
+            (i as i64, (j as i64) - 1),
+            (i as i64, (j as i64) + 1),
+            ((i as i64) - 1, j as i64),
+            ((i as i64) + 1, j as i64)];
+        for (nexti, nextj) in neighbors {
+            if nexti < 0 || nextj < 0
+                || nexti >= height as i64 || nextj >= width as i64
+                || map[nexti as usize][nextj as usize] > map[i][j] + 1
+            {
+                continue;
+            }
+            let nexti: usize = nexti as usize;
+            let nextj: usize = nextj as usize;
+            let new_cost = cost + 1;
+            if new_cost < costs[nexti][nextj] {
+                costs[nexti][nextj] = new_cost;
+                queue.retain(|(_, (ri, rj))| *ri != nexti || *rj != nextj);
+                queue.push((-new_cost - heur[nexti][nextj], (nexti, nextj)));
+            }
+        }
+    };
+
+    println!("= {:?}", answer);
+}
+

day12/src/main1.rs

@@ -0,0 +1,83 @@
+use std::env;
+use std::fs::File;
+use std::io::{self, BufRead};
+use std::collections::BinaryHeap;
+use std::cmp::max;
+
+fn get(map: &Vec<Vec<i64>>, coord: (usize, usize)) -> i64 {
+    map[coord.0 as usize][coord.1 as usize]
+}
+
+fn main() {
+    let file = File::open(&env::args().nth(1).unwrap()).unwrap();
+    let mut map: Vec<Vec<i64>> = Vec::new();
+    let mut queue = BinaryHeap::new();
+    let (mut start, mut end) = ((0, 0), (0, 0));
+
+    // parse input
+    for (i, line) in io::BufReader::new(file).lines().flatten().enumerate() {
+        let mut row: Vec<i64> = Vec::new();
+        for (j, c) in line.chars().enumerate() {
+            match c {
+                'S' => { start = (i, j); row.push('a' as i64); },
+                'E' => { end = (i, j); row.push('z' as i64); },
+                c => row.push(c as i64),
+            }
+        }
+        map.push(row);
+    }
+    let (height, width) = (map.len(), map[0].len());
+    let mut costs = vec![vec![i64::MAX; width]; height];
+    let heur: Vec<Vec<i64>> = (0..height)
+        .map(|i| (0..width)
+            .map(|j|
+                max((i.abs_diff(end.0) + j.abs_diff(end.1)) as i64,
+                    get(&map, end) - get(&map, (i, j))))
+            .collect())
+        .collect();
+        
+    queue.push((-heur[start.0][start.1], start));
+    costs[start.0][start.1] = 0;
+
+    // A*
+    let answer = loop {
+        // no route
+        if queue.is_empty() {
+            break None;
+        }
+
+        let (_, (i, j)) = queue.pop().unwrap();
+        let cost = get(&costs, (i, j));
+
+        // found destination
+        if (i, j) == end {
+            break Some(cost);
+        }
+
+        // handle neighbors
+        let neighbors = [
+            (i as i64, (j as i64) - 1),
+            (i as i64, (j as i64) + 1),
+            ((i as i64) - 1, j as i64),
+            ((i as i64) + 1, j as i64)];
+        for (nexti, nextj) in neighbors {
+            if nexti < 0 || nextj < 0
+                || nexti >= height as i64 || nextj >= width as i64
+                || map[nexti as usize][nextj as usize] > map[i][j] + 1
+            {
+                continue;
+            }
+            let nexti: usize = nexti as usize;
+            let nextj: usize = nextj as usize;
+            let new_cost = cost + 1;
+            if new_cost < costs[nexti][nextj] {
+                costs[nexti][nextj] = new_cost;
+                queue.retain(|(_, (ri, rj))| *ri != nexti || *rj != nextj);
+                queue.push((-new_cost - heur[nexti][nextj], (nexti, nextj)));
+            }
+        }
+    };
+
+    println!("= {:?}", answer);
+}
+

day12/test.txt

@@ -0,0 +1,5 @@
+Sabqponm
+abcryxxl
+accszExk
+acctuvwj
+abdefghi

day13/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day13"
+version = "0.1.0"

day13/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day13"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day13/input.txt

@@ -0,0 +1,449 @@
+[[],[[0,[10,1],3,[4]],9,[2,10,4,10]],[5,[0,0,[1,2,7,5]]]]
+[[[],[[8,5,2,8,0],[4,7,0,5],[2,7,7]],4],[4],[2,8,[[9,4,8]],6,10],[[[3,0,2,5],[],4,[7,9],[1,5,10,9,6]],4],[]]
+
+[[[8],0,[[3],10]],[]]
+[[5,1,[[0,10,5],3,10],9],[[5,[0,9,3],[2,1,5],10]],[1,[[10,1,9,10],[10],2,1],[[9,0,8,6,7],1],[3]]]
+
+[3,8,3,3]
+[3,8,3,3,4]
+
+[[6,[7,10,9,[1,4]]],[4,2]]
+[[[[3,2,8,6,9],[6,2],6,[3,5,9,5]],[],4,[],6],[8,[6,8],9,[],10],[],[[8,[],3,10],[10,[5,0],7,[]],[[6,8]],[]]]
+
+[[0,6,[3,1,[2],[8,6,3,8,1],6]],[6,[[3],[7,6,4,9],8,[6,4,8,8,1],7]],[]]
+[[[[10,0],4]],[],[7,[[8],1],[[3,3,10,9,4],[0,8,2,0,5],[],[2,3,3,4,4]],10,6],[[],[[5,7,1],10],[[1,3,3],[10,9],[6,3,10],5]]]
+
+[[[4],[7,1,[1,2],0,7],[[]]],[[7],5]]
+[[[[1,2]]],[[[7,8,6,6],[],[],[]]],[[[10,10],7],[8,2,[6,2,7,9],[5],[1,7,9,2,10]],[2,1],[5]],[[],0,8,1,1],[3,[[6,2,5,8,8],[10,9,5]],[[7,5,6,3,8],[8,5],10,5]]]
+
+[[4]]
+[[],[3,5,1],[3,[7,0,[4,8]],[4,[4,7,2,4]]]]
+
+[[[0],[[4,2],3],4,6,2],[],[0,[8,[0,7,8]],[7,0,[5],7,9],1,[]],[5,6,[]]]
+[[4,[[4,10,1,1]]],[10,[[4,6,5,10,0],[3]]]]
+
+[[7,[3,[],4],[[5],[9,8,6,5],8,4,10],[[],0,[10,0],[]]],[[6,6,[3,2,4]],4,9,[8,0]]]
+[[],[6,[6,[6,8,10],1,7],[[8,0,5],[],3,3]],[6,0,[[2,2,8],3,0,[2,10,5,3,4],[3,6,2]],2]]
+
+[[[[10,1,3,8,5],8,[],5,9],[1,3],5,10,[[5,4],[8,2],[1],1]],[[4],[6,6]],[[5],2,[[4,6,1,10],[]],[[9,2,8,10,4],[]],1]]
+[[[[10,7],2,[3,5]],2,[[5,7,7,1,2],10,0,2]],[2],[[]],[8,[10,1],[[0,4],[6,6,9,5,5],[10,1,3,9,5],[6,0,9,0,0]],10],[[10,[1,0],6,[10]],[1,[5]]]]
+
+[[4],[7,[[],[3,0,1]],6,4,10],[]]
+[[[[4,3],1,0,[6]]],[[7],[[8,6,9,5],1,[2]]]]
+
+[[10,5,[[7,9],[3,10,3,10,4],6,[6,7],4],2],[0,[10,6,[1]]],[7],[1,[3,[4,0,7]],7],[9,1,[[3,3,10,3],1]]]
+[[[]]]
+
+[[[2,4,[],[9,10,3,2]],1,[[5,7,6,0]],8],[],[0,9,9,9],[]]
+[[[[0,6],[1,9,4,9,10]],9,[[7,7,2,4,9],[10,1,9,9]],9],[5,6,[10,[0]]]]
+
+[[7,[[3,6,9,10,3],7,[1],[3,9],[]],3],[7,2],[],[]]
+[[],[],[8,[[0,5],[3,5,7,8,10],2,1]],[]]
+
+[[[5,[10,8,8],10,[5,5,10,5],1],[6,[6,3,0,2,6],8,3,[7,8,3]],[],[3]],[3,[[9,2,10,2,10],[6]],[9,7,0],4,[[3,3],5]],[[],0,[[1]],[],8],[[[0]],2],[[[10,3,0,2,9],[9,9,6,4],[7,1,2,6,5],[0,8],[2,2,5,0,7]],9]]
+[[[4,[1,8,0,5,0],1,0,7],2],[]]
+
+[[[[10],4,[],8,[]],[[10,8,6],[0],[2],[0],3]],[10,1,6,0,[]]]
+[[[],3,[],[9,6,2],0],[9,2,3,[2,[1,8,5,8,3],0],5],[4,[0,3,[5,2,8,5,7],[6,6,5,7],[5,6,0,3,10]],0,[[9],[3,8,3,3,3],7]]]
+
+[[[7],9,1]]
+[[[5,[1,1,1,10],[9]]],[],[[],10]]
+
+[[[4],[[2],[8],[],1],[]]]
+[[],[],[[[5,2],3,2,[],[5,10,5,5]],1,[[6,7,2],[4,7,3,8,10]]],[[7,1],9,2],[9,5,[10],10,[7,10,7,[2,1,5,1,2],[]]]]
+
+[[0],[8]]
+[[],[[0,8,5,6,[6,5,8,8,3]],[4,[8,0,6],[3,8,0],5],6,0],[[8,7,[9],10],1,4,9],[4,[[4]],0,[10,[],[3,4],3]],[[[8,7,8,5,5],[6]]]]
+
+[[[8]],[[[7,3,5,7,1],[9,8],[5],10,2]]]
+[[[[8],[10,3,5,0,7],7,[2,1]],[]],[6,[[],4,7,10,0],[]],[]]
+
+[[[[9,9,9,10,1],1,4,4],4,[[],1,[0,1,2,8,8],[0,7,6,3]]],[5],[[[0,1],6,[2,8,2],6],[]]]
+[[6,1,[8,[10],6]],[2,[[5],[],[8,4,7],6,[]],[4,[3,5,7]],[[4]],[[1,1],9]],[[2,5,[0,1,9,4],5,[0]],7,[1,3,5,[],10],7,1],[]]
+
+[[[[3,10,6,2,0],[5,0,5,5,7],7,[2,4],4]],[[0,6,10,4]],[4,[[],0,7]],[[2,[3,2,2,6],2],[[9,5,0],9,0,[1,6,8,9]],10]]
+[[6,8,9],[[[]],[[0,0,7,7],1,9,[5,2,3],8],6],[[1],[6,2,[]],10,1],[[[8,3,2]],[5,5,5,[5,4,6]]]]
+
+[[10,[]]]
+[[[[10,1,0],[0,2,4]],[[9],1,[],3,10],10,[2,8,[6,8],2]]]
+
+[[10,2,[],5,2],[[],9],[[[9],8,8,2],3],[[7,5,10],8,9,[],[2,2]]]
+[[],[9]]
+
+[[4,6]]
+[[2],[[7,0,[3,0,10,8],8,[5]]],[[10,10,1]],[[8],8,[0],[[7,5,2,8,9],[],3,[],[5,10,10,9,0]],0]]
+
+[[],[[]]]
+[[],[[4,[10,6,0,5,4],[7,8,8],5],[4,[10],[8,4],2,[0]],[],9]]
+
+[[7,[[0,4,8,7],[],[3,5,6,10,4],10,[5]]],[],[8,10],[8],[3,[[7,3,10]]]]
+[[6,[4,3],9,[[5,10,5],0,10],9],[[8],5,[6,[]],[[6,4,8,8,7]]],[],[[]]]
+
+[[[[6,6]]],[],[[7],[[7],5],[]],[3,[[6,1,9],6,8]],[[3]]]
+[[2,[[],6,7,7,8],4,[8]],[[5,[],2,[5,2,8,7,4],2]]]
+
+[[0,9]]
+[[2,6],[[]],[[],0,6]]
+
+[[[5],2,2]]
+[[[8,9,[5,1,7,6,1],3,[]],[[1,4,1,5],[10,8],[9,4,7],2]],[4,3,[[6],[5],[3,10],[9,10,2,5,2],4]]]
+
+[[8,1]]
+[[[8,[1,10],8],[[3,2,7,3,10],9,10,[7,5],8],[7],2,2],[[1],6,[[10,5,5],[9,8,7,1],10,[7,0,9,10,10],[4]]],[2,[[2],[4,1,6,7]],[10,[8,1]],1,6],[1,[[7],0,[4,7,4,8,9],[10,9,3,5]],[[10,8,8],[]],8,2]]
+
+[[[]],[[5,6,4,9],1,[[0,9,7,1,7],[9],[8]],3,10]]
+[[0,[[5,7],[0,6,5],[1],6],8],[5,1],[[[9,4],10,4,[10,8]],[[7,7,10,2]]]]
+
+[[[],0,[]],[],[],[[4,2,[7],10],[[8,8,7,8,5],[9,0],[5,7,4,2],3],7,[[0,3,8,3,8],4,1,4]],[[4],9]]
+[[[3],[[10,0,6,7,7]],[[1,7,3,2],[10,6,3,2,7],8,[4],9]],[9,4,0,[10,[1,9,0,8,0],0],10],[4],[1],[9,2,[],0]]
+
+[[5,[[1,0,6,7],[7],[8,0,6,7],6,[8,2]]],[1]]
+[[3,[9,[6]],[]]]
+
+[[[[8,9,5,9,10],[4,10,6,3],[0,9],5],[[],0,[5,6,6],[0],8],6],[[2,3,3,[0],[3,10]]],[],[[[3,9]],5,[],[1,7,[6,10],0,[0,4,10,5]]],[[5,1,[10,3,8,2],[]],[],[8,[],0],[[9,7,1],[8,6]],[]]]
+[[[],[10,[5,2,9],[5,2,8]]],[[3,3]],[[1,8],6,6,8,7]]
+
+[[5],[1,10,[],10]]
+[[1,6,9,1],[8,7,9],[3,3,5,1],[[9,8,[4]],[[4,3],10,[10]]]]
+
+[[[[5,6,9],2,0,[7,1,2]],[[1,10],5,[8,3,6,4],[],[5,10]]],[9,9,6],[9],[[1,4,4],3],[[[7],10,[6],[7],[9,3,3,7]],6,4,6,10]]
+[[[[1,3],[6,8,6,3,2]]],[[[],[2,6]],1,4,[[],[4,6,10,10,10],[],[9,2,10]],0],[2,[[0],[1,1],1],[[6,0,3,3,3],[7,10,1],[10,10]],[4,[3,8,5,2,9],[5,2],[4,5]]],[9,[]]]
+
+[[9]]
+[[],[[[8,2,9],10,0]],[0,[2,7,[2,9,8]],5,[]],[]]
+
+[[7,8,[[9,7,10,10],8]],[[0],[[1,10,7,4],0,[]],[[]],[1,0,[4,7,3,3,5],[4]]],[]]
+[[10,2,6,[],[[7,0,3,3],10,[9,2,7],7,4]],[[[3,1,1,1,9],1],[2,9,[]],8],[8],[1,8,8,[6,[4,5,5,10,0],9,9]],[]]
+
+[[],[8,[],[[],[9,2,2],7],[[9,7,6],10]],[[0,[8,6,6,9,5],10],10,[3]],[[1,[10,4,1,5],2,[8,8,8,4,7]],8,4,1,[1,[3,2,6,7,5],3]],[6]]
+[[],[[[3,5],[6,3,5],[2,9]],[[6,10,4,2],4],9],[[[3,6,6],4],[[4],[5,0,5],2,2],[9,[8,7,5,3]]]]
+
+[[7,[[8,2,3,10]],5,[7]],[[[6,6,5,2]],[2,1,[],1]]]
+[[0,4,6],[10,4,8],[9,[[0,9,10,5],8,9,[7,7]]]]
+
+[[[0,[8,8],5,[4,10,8,9]],4],[4,[1,[6,0],0,3]],[5,5,[8,[10,2,4,8,2],[5],6],[8,[8],5],[4,[],4,[0,2,8,4]]],[[[7,0,2,2,4],10,[],9],[],[[1,8,10,4,6],1,0,[]]],[0,6,[5,2],3]]
+[[[[7,2,9,1,1],1,[1,5,4]],[],7,9,9],[3,9,1],[7,9,[6,8,5,[2]]],[3,[]]]
+
+[[[5,[],1],9,[[2],8,[1,7,5,0],[6,5,9,1]],[2,[8,4]]]]
+[[[2,9,7,[10,5,0]],3,7,8],[[[3]],[]],[[10,0,1,6,[]],[[4,9,3],2],8,[6]],[[6,7,6,[1],[2,7]],[4],[5],[[10],[],[0,6],1]]]
+
+[[],[[],[1,6,[9,9,8,1],5],6],[],[5,5,[],5],[]]
+[[[[5,0,7]],9,[[7,6,9],[],10,[2,1]],8],[[[7],5,[3,1,6,9],2,[10]],6],[5]]
+
+[[],[],[1,[[0,0,3,2,10],[0,5,0,10],7,1,5]],[[]]]
+[[3],[[]],[6,3,5],[[[7,7,4,7,4],[8,7],[10,5]],[[1,4]],5]]
+
+[[9],[[1,[4,0,2,5],[1,8,3,10,9]]],[9,[[4,9,10,10,8],5],[],10],[7,2,[[6,8],[9,9],6],5]]
+[[3,9,[[7,5,7],[4,8,1,10],0,0],[9,[6,0,0],5,9,[7,10]],5],[],[10]]
+
+[[8,6,[[],[8]],6,7],[[[],[3]],[10,1,[6],[4],[4]],1],[2,[[6,2,8,10],[],9]],[2,10,10,[8,[9,3,0],[2,3,6]],5],[9]]
+[[5,3],[9]]
+
+[[[[2,0,0,7],[],[10],[],[4,2]],[[1],8,[2],[8,3]]],[[0,[6,0,1,6],[7,0],[0,9,3]]],[],[[0,[4,7]]],[6,[8,[10,1,9,9],1,[2,0,7,2]],1,[[5,7]]]]
+[[0,[],1]]
+
+[[[8],[7,0,[]],1]]
+[[0],[]]
+
+[[8,[[0,8,5,7],4,0,[2,7,0]],7,[],4],[]]
+[[[[4,0,6,9,6],[7,2,9,9],[1,3,7,7],3],6],[],[4,9,4,3],[[],[],[[]]],[7,[]]]
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+
+[[[[],[0,5,8,10]],[6,[10],10,2,[4,1,10]]],[6],[[[10],[2,2,0,3,0],1,[4,6]],[2,[6,10,3,2],1,7],[],2]]
+[[[],1,[[9,3,2],[5,4,1,5,7]],2,8],[4,[5,[9,5]],[3],[[],4,[2,1]]],[7],[10,8,3,[5,[6,7,6,1],3],2]]
+
+[[[[9,0,8]],[8],5,9],[[4,[4,0,3,3],[4],[6]],5,[7,[],[9,2,0],[5,5,10,9,7]],0,[[4],[10],[10],10]],[],[[[2],6,[8,6],10,0],8]]
+[[4],[2,3,[[5,8,9],[1],[4]]]]
+
+[[[[4,5,10,4]],6]]
+[[[1,8,[9,3,4,10],4]],[7,1],[4,[[1,5,3],[6]],[2,[1,7,10,2],[5,5,10,4,9],[]],8,[]],[[],2,5],[[9],8,[[7,6,1,0]],[]]]
+
+[[9,10],[6,[[]],9,6,[6,7,[0,0,7,6]]],[],[[]],[]]
+[[],[6,[[2],10,9,2,1],10,0,9],[0,[0],9],[[[2,10],2,6,[4]],0,5]]
+
+[[5,10,[2],[[10,2,9],[0,8,8],6,[10,4,4,7],[8,7]],2],[8,[2,[6,1,8,1,7],[3,9,10,0,0],3,[5,2,3,8,9]]],[[[4,2,5,4],4,1,6,[5,5]],[[1],7,6],2,6]]
+[[2],[9,[2]]]
+
+[[5,[7],9,[6,[8],[0,1,7,7],3],7]]
+[[1,[8,10,[4,2,0,4,8],[10,4,7,5,0]]],[5,2,[2],4],[],[0,6,8,[[1],5,2,[6,5,4,2]]],[10,[],9]]
+
+[[[],[9,[5,7,5],7,[2,10],[3,3]],8]]
+[[],[[[10,0,4,0],10,[],[10,9,5,6],8],1,[[7,5,4],[9,6,2,4],6,[1,5],[8,7,9]],9],[],[9,[5,[2,3,1,3,9],10,9],4]]
+
+[[6,4,[]]]
+[[[[2,4,8,2],2,[],[5,3,6,5],[4]]],[2,[1,4,5,[7,7,6],3],2],[[5,[8],4,[5]]],[3,1]]
+
+[[8,[3,0],6],[8,[6,1],[[6,3,2],6,7,[8,7],0]],[[4,0],[9],[[3,1],[4,1,7,8,0],[5,5,6,4],10]],[0,[10,[7,6],8,[9,1,1,9,3],10],[[3],1,1]],[[[9],5],6]]
+[[4],[[2,3,7,[10],10]],[[[],8],0,[2],[6,[5,0,4,3,6],5,[],4]],[7,[2,[8,2,1],3]],[[[5,6,0,5],6],[9],7,1,[]]]
+
+[[10,[2,6,[3,5,6],6],9],[],[9],[4,1]]
+[[],[],[[1],3,[[6,9,6],[],[6,6,2,2],[10]]]]
+
+[[[1]],[[],6],[],[[10],3,[],[[1,6,10,9],[10],[2,8,1]]]]
+[[],[[8,7,[6,8,6,4],6],4,9]]
+
+[[9],[2,3,[9,[],[10,10,8]]],[],[9,[5,[8,0,5],[8,4,8,7]]],[[[7,2,2],4,9,[3,6]],7,5,1,0]]
+[[[[7,10,1,0,6],[],[0,7,10,9]]],[[1,[0]],1,[[4,1],8,1],2],[[[],[5,3],[],3,[2,10,10,9,9]]]]
+
+[[[0,[3,5,8],[0],10,3],7],[[3,5,[],2]]]
+[[],[0,[4,1],6,[6,[4],[2,3,3],6,[6,0]]],[],[[[]],0,[]]]
+
+[[6,[],8],[9,5]]
+[[1,1],[[[3,3],1,[4,7,3,0]],3,6],[1,[9,[]],[[8,9],[3,4,7,8,10]]]]
+
+[[0,[4,1,[10,0,5],[]],4,[9]],[[4],[]],[7],[]]
+[[0,[10,3,[5,7,3],[5],[]],[[9,3,7,9,7],5,[1,7,8,7],[]],[[4],0,[],2],[[7,2,10,7,0],10,5,[]]],[5,10,[5,[2,3],0,[3,10,7,10]],5],[[8,2,10],[4,[]],0,2,8],[4,[9,[2,4,10]],[[2,4,7],5],[[2]]],[[1,[0,9,3],7,[]],[[],[],2],3]]
+
+[[[[1,10],2,3,[10,1,3,0,5]],5,10,8,[[5,2,10,4,0],[3,0,7],[2,3,9,8],[10,10,5,2]]]]
+[[6,[10,[],[2,0],7],[[3,8,3],[],[10,6],3],1,[[],1,[3,3],6,5]],[[[]],[[10,2],10,7,10,8]],[[],[]]]
+
+[[6,6]]
+[[6,[5],0,[[4,6],[9,2,8,10,1],[3,10,3,9],[10,9],7],2],[10],[[0,7,[3,7,7,3],[3,6],[2,10]],2,[1,2],6,7],[[[],8,10,6,9],8,[[7,8],8,6,5],[[8,0,10],[0,1,1],3,7],2]]
+
+[[2,8,[]],[[],[0,[4]]]]
+[[[8,[10,10,7],[9,1,8,5]],5,[2,[9,9],[9,6],1,[10,7,4]],2],[[2,[5,6,9,2],1,9,[4]],9,3,6],[[8,[6],[]],[9,[0,5,7],2,0,[]],8],[7,2]]
+
+[[[],9,[4,5],[7],4],[[],[0,9,[4,2],9,[6,3,0,2,4]],[[7],[1,7],3,[6,8,10]],0,0],[7],[[[2,2,6,8],[0,2,0,8],7,[7,6,2,5]],[6],8,5,[[0,6,2,8,3],[8,1,9,4]]]]
+[[7,10,[],4],[[5,[3,3,2,2,6],[],1],6,2,0],[[9],[[]],0]]
+
+[[[8,[2]],[[6,7,10,10,4],[1],7],[4,[5,8]],7,[9,[],[7],4,[0,3,4,4]]],[[2,10],9,[10,8,5,[9,7,10,6]],[[],[6,1,4,5,6],2,2],[6]],[10,[],[6,6,10],0],[]]
+[[[5,[6,4,5],[3]],[],[7],[[0]],[]],[7],[],[[[9,7,9,0],0,10,[3]],8,10,[]],[9,1,[],3]]
+
+[[4,[[1,7,6,10],[10,1,4],3]],[1,[4]],[[[4,8,2,5,3],8,8,[4,0,1,7,5],[9,4,5,10,6]],4],[6],[4,[5,[8,1,10,6,9],6,[1,3,10,5]],2]]
+[[],[8,5,7],[]]
+
+[4,8,9,4,9]
+[4,8,9,4]
+
+[[[],[9,[10],2,[8,10,3,9],[9,2,6,0,3]],[[0],3,8,6,[0,7,5,7,5]],5,6],[[[2,9,5,7,0],10,[9,7],9,[8,7,7,7]]],[[10]]]
+[[]]
+
+[[4],[[],10,10],[2,[[1,5]],6,[[],[5],[8,1,1,2]],1],[[],[7]],[5]]
+[[[[3,9,4,6]],6],[],[6],[2],[[[6,1,10],2],10,[],[[8,8,5,7,9],8,[2,6,9,1]]]]
+
+[[7,8,0,[[2],4,[0,1,7,4],[3,1,5,5]]],[]]
+[[[[],7,[3,0],2],[[]]],[9,[8,[6,3],0,[0,10,4,5,6],4],[[9,8,6,3],[9],[4,5,0],[4,0,8,4,2]]],[[1]],[],[0]]
+
+[[[[2,2],4,[10,9,8,9],7,[]],[[6,5,9,10,10],3],[[0,7,8,4,8]],6],[2],[6,7,3,[5]]]
+[[10,[10,3,[0,5,9,3],[0,3,3,6,6]]]]

day13/src/main.rs

@@ -0,0 +1,81 @@
+use std::env;
+use std::cmp::Ordering;
+use std::fs::File;
+use std::io::{BufReader, BufRead};
+
+fn parse_num(s: &[u8]) -> (u64, usize) {
+    let mut num: u64 = 0;
+    let mut len = 0;
+    for i in 0..s.len() {
+        if s[i].is_ascii_digit() {
+            num = num*10 + (s[i] as u64 - '0' as u64);
+            len += 1;
+        } else {
+            break;
+        }
+    }
+    (num, len)
+}
+
+// Assuming no malformed input
+fn compare(left: &[u8], right: &[u8]) -> Ordering {
+    if left.len() == 0 {
+        return Ordering::Less;
+    }
+    if right.len() == 0 {
+        return Ordering::Greater;
+    }
+    let (l, r) = (left[0], right[0]);
+    if l == b',' && r == b',' {
+        compare(&left[1..], &right[1..])
+    } else if l == b'[' && r == b'[' {
+        compare(&left[1..], &right[1..])
+    } else if l == b']' && r == b']' {
+        compare(&left[1..], &right[1..])
+    } else if l == b']' {
+        Ordering::Less
+    } else if r == b']' {
+        Ordering::Greater
+    } else if l == b'[' {
+        let (num, len) = parse_num(right);
+        compare(
+            &left,
+            &[b"[", num.to_string().as_bytes(), b"]", &right[len..]].concat())
+    } else if r == b'[' {
+        let (num, len) = parse_num(left);
+        compare(
+            &[b"[", num.to_string().as_bytes(), b"]", &left[len..]].concat(),
+             &right)
+    } else {
+        let (lnum, llen) = parse_num(left);
+        let (rnum, rlen) = parse_num(right);
+        if lnum < rnum {
+            Ordering::Less
+        } else if lnum > rnum {
+            Ordering::Greater
+        } else {
+            compare(&left[llen..], &right[rlen..])
+        }
+    }
+        
+}
+
+fn main() {
+    let file = File::open(&env::args().nth(1).expect("input")).expect("io err");
+    let mut lines: Vec<_> = BufReader::new(file).lines().flatten()
+        .filter(|line| line != "").collect();
+    lines.push(String::from("[[2]]"));
+    lines.push(String::from("[[6]]"));
+    lines.sort_unstable_by(|s1, s2| compare(s1.as_bytes(), s2.as_bytes()));
+    
+    let (mut six, mut two): (usize, usize) = (0, 0);
+    for (i, line) in lines.iter().enumerate() {
+        if line == "[[6]]" {
+            six = i + 1;
+        }
+        if line == "[[2]]" {
+            two = i + 1;
+        }
+    }
+    println!("{:?}", six*two);
+}

day13/src/main1.rs

@@ -0,0 +1,74 @@
+use std::env;
+use std::fs::File;
+use std::io::{BufReader, BufRead};
+
+fn parse_num(s: &[u8]) -> (u64, usize) {
+    let mut num: u64 = 0;
+    let mut len = 0;
+    for i in 0..s.len() {
+        if s[i].is_ascii_digit() {
+            num = num*10 + (s[i] as u64 - '0' as u64);
+            len += 1;
+        } else {
+            break;
+        }
+    }
+    (num, len)
+}
+
+// Assuming no malformed input
+fn is_in_order(left: &[u8], right: &[u8]) -> bool {
+    //println!(">> {:?}, {:?} -- {:?}", str::from_utf8(left), str::from_utf8(right));
+    if left.len() == 0 {
+        return true;
+    }
+    if right.len() == 0 {
+        return false;
+    }
+    let (l, r) = (left[0], right[0]);
+    if l == b',' && r == b',' {
+        is_in_order(&left[1..], &right[1..])
+    } else if l == b'[' && r == b'[' {
+        is_in_order(&left[1..], &right[1..])
+    } else if l == b']' && r == b']' {
+        is_in_order(&left[1..], &right[1..])
+    } else if l == b']' {
+        true
+    } else if r == b']' {
+        false
+    } else if l == b'[' {
+        let (num, len) = parse_num(right);
+        is_in_order(&left, &[b"[", num.to_string().as_bytes(), b"]", &right[len..]].concat())
+    } else if r == b'[' {
+        let (num, len) = parse_num(left);
+        is_in_order(&[b"[", num.to_string().as_bytes(), b"]", &left[len..]].concat(), &right)
+    } else {
+        let (lnum, llen) = parse_num(left);
+        let (rnum, rlen) = parse_num(right);
+        if lnum < rnum {
+            true
+        } else if lnum > rnum {
+            false
+        } else {
+            is_in_order(&left[llen..], &right[rlen..])
+        }
+    }
+        
+}
+
+fn main() {
+    let file = File::open(&env::args().nth(1).expect("input")).expect("io err");
+    let lines: Vec<String> = BufReader::new(file).lines().flatten().collect();
+    // TODO: array_chunks() for lazy iter?
+    let blocks: Vec<_> = lines.chunks(3).collect();
+    
+    let mut sum = 0;
+    for (i, block) in blocks.iter().enumerate() {
+        // TODO: return error here instead of assert?
+        assert!((block.len() == 3 && block[2] == "") || block.len() == 2);
+        if is_in_order(block[0].as_bytes(), block[1].as_bytes()) {
+            sum += i + 1;
+        }
+    }
+    println!("Answer: {:?}", sum);
+}

day13/test.txt

@@ -0,0 +1,23 @@
+[1,1,3,1,1]
+[1,1,5,1,1]
+
+[[1],[2,3,4]]
+[[1],4]
+
+[9]
+[[8,7,6]]
+
+[[4,4],4,4]
+[[4,4],4,4,4]
+
+[7,7,7,7]
+[7,7,7]
+
+[]
+[3]
+
+[[[]]]
+[[]]
+
+[1,[2,[3,[4,[5,6,7]]]],8,9]
+[1,[2,[3,[4,[5,6,0]]]],8,9]

day14/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day14"
+version = "0.1.0"

day14/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day14"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day14/input.txt

@@ -0,0 +1,151 @@
+492,26 -> 492,17 -> 492,26 -> 494,26 -> 494,16 -> 494,26 -> 496,26 -> 496,22 -> 496,26 -> 498,26 -> 498,17 -> 498,26 -> 500,26 -> 500,20 -> 500,26 -> 502,26 -> 502,25 -> 502,26 -> 504,26 -> 504,23 -> 504,26 -> 506,26 -> 506,21 -> 506,26 -> 508,26 -> 508,16 -> 508,26 -> 510,26 -> 510,24 -> 510,26
+481,92 -> 481,96 -> 476,96 -> 476,99 -> 487,99 -> 487,96 -> 485,96 -> 485,92
+460,73 -> 460,70 -> 460,73 -> 462,73 -> 462,69 -> 462,73 -> 464,73 -> 464,65 -> 464,73 -> 466,73 -> 466,65 -> 466,73 -> 468,73 -> 468,64 -> 468,73 -> 470,73 -> 470,68 -> 470,73 -> 472,73 -> 472,68 -> 472,73
+470,76 -> 470,80 -> 466,80 -> 466,84 -> 481,84 -> 481,80 -> 474,80 -> 474,76
+492,26 -> 492,17 -> 492,26 -> 494,26 -> 494,16 -> 494,26 -> 496,26 -> 496,22 -> 496,26 -> 498,26 -> 498,17 -> 498,26 -> 500,26 -> 500,20 -> 500,26 -> 502,26 -> 502,25 -> 502,26 -> 504,26 -> 504,23 -> 504,26 -> 506,26 -> 506,21 -> 506,26 -> 508,26 -> 508,16 -> 508,26 -> 510,26 -> 510,24 -> 510,26
+495,155 -> 499,155
+460,73 -> 460,70 -> 460,73 -> 462,73 -> 462,69 -> 462,73 -> 464,73 -> 464,65 -> 464,73 -> 466,73 -> 466,65 -> 466,73 -> 468,73 -> 468,64 -> 468,73 -> 470,73 -> 470,68 -> 470,73 -> 472,73 -> 472,68 -> 472,73
+500,138 -> 505,138
+484,39 -> 484,38 -> 484,39 -> 486,39 -> 486,33 -> 486,39 -> 488,39 -> 488,30 -> 488,39 -> 490,39 -> 490,35 -> 490,39 -> 492,39 -> 492,38 -> 492,39 -> 494,39 -> 494,30 -> 494,39 -> 496,39 -> 496,36 -> 496,39
+481,92 -> 481,96 -> 476,96 -> 476,99 -> 487,99 -> 487,96 -> 485,96 -> 485,92
+492,26 -> 492,17 -> 492,26 -> 494,26 -> 494,16 -> 494,26 -> 496,26 -> 496,22 -> 496,26 -> 498,26 -> 498,17 -> 498,26 -> 500,26 -> 500,20 -> 500,26 -> 502,26 -> 502,25 -> 502,26 -> 504,26 -> 504,23 -> 504,26 -> 506,26 -> 506,21 -> 506,26 -> 508,26 -> 508,16 -> 508,26 -> 510,26 -> 510,24 -> 510,26
+460,73 -> 460,70 -> 460,73 -> 462,73 -> 462,69 -> 462,73 -> 464,73 -> 464,65 -> 464,73 -> 466,73 -> 466,65 -> 466,73 -> 468,73 -> 468,64 -> 468,73 -> 470,73 -> 470,68 -> 470,73 -> 472,73 -> 472,68 -> 472,73
+492,26 -> 492,17 -> 492,26 -> 494,26 -> 494,16 -> 494,26 -> 496,26 -> 496,22 -> 496,26 -> 498,26 -> 498,17 -> 498,26 -> 500,26 -> 500,20 -> 500,26 -> 502,26 -> 502,25 -> 502,26 -> 504,26 -> 504,23 -> 504,26 -> 506,26 -> 506,21 -> 506,26 -> 508,26 -> 508,16 -> 508,26 -> 510,26 -> 510,24 -> 510,26
+460,73 -> 460,70 -> 460,73 -> 462,73 -> 462,69 -> 462,73 -> 464,73 -> 464,65 -> 464,73 -> 466,73 -> 466,65 -> 466,73 -> 468,73 -> 468,64 -> 468,73 -> 470,73 -> 470,68 -> 470,73 -> 472,73 -> 472,68 -> 472,73
+492,26 -> 492,17 -> 492,26 -> 494,26 -> 494,16 -> 494,26 -> 496,26 -> 496,22 -> 496,26 -> 498,26 -> 498,17 -> 498,26 -> 500,26 -> 500,20 -> 500,26 -> 502,26 -> 502,25 -> 502,26 -> 504,26 -> 504,23 -> 504,26 -> 506,26 -> 506,21 -> 506,26 -> 508,26 -> 508,16 -> 508,26 -> 510,26 -> 510,24 -> 510,26
+489,115 -> 489,119 -> 481,119 -> 481,126 -> 494,126 -> 494,119 -> 493,119 -> 493,115
+492,26 -> 492,17 -> 492,26 -> 494,26 -> 494,16 -> 494,26 -> 496,26 -> 496,22 -> 496,26 -> 498,26 -> 498,17 -> 498,26 -> 500,26 -> 500,20 -> 500,26 -> 502,26 -> 502,25 -> 502,26 -> 504,26 -> 504,23 -> 504,26 -> 506,26 -> 506,21 -> 506,26 -> 508,26 -> 508,16 -> 508,26 -> 510,26 -> 510,24 -> 510,26
+485,112 -> 485,102 -> 485,112 -> 487,112 -> 487,111 -> 487,112 -> 489,112 -> 489,105 -> 489,112
+481,92 -> 481,96 -> 476,96 -> 476,99 -> 487,99 -> 487,96 -> 485,96 -> 485,92
+484,39 -> 484,38 -> 484,39 -> 486,39 -> 486,33 -> 486,39 -> 488,39 -> 488,30 -> 488,39 -> 490,39 -> 490,35 -> 490,39 -> 492,39 -> 492,38 -> 492,39 -> 494,39 -> 494,30 -> 494,39 -> 496,39 -> 496,36 -> 496,39
+470,49 -> 470,53 -> 468,53 -> 468,60 -> 477,60 -> 477,53 -> 476,53 -> 476,49
+483,160 -> 487,160
+492,26 -> 492,17 -> 492,26 -> 494,26 -> 494,16 -> 494,26 -> 496,26 -> 496,22 -> 496,26 -> 498,26 -> 498,17 -> 498,26 -> 500,26 -> 500,20 -> 500,26 -> 502,26 -> 502,25 -> 502,26 -> 504,26 -> 504,23 -> 504,26 -> 506,26 -> 506,21 -> 506,26 -> 508,26 -> 508,16 -> 508,26 -> 510,26 -> 510,24 -> 510,26
+460,73 -> 460,70 -> 460,73 -> 462,73 -> 462,69 -> 462,73 -> 464,73 -> 464,65 -> 464,73 -> 466,73 -> 466,65 -> 466,73 -> 468,73 -> 468,64 -> 468,73 -> 470,73 -> 470,68 -> 470,73 -> 472,73 -> 472,68 -> 472,73
+491,131 -> 502,131 -> 502,130
+475,88 -> 475,89 -> 483,89 -> 483,88
+483,164 -> 487,164
+498,147 -> 503,147
+505,147 -> 510,147
+485,112 -> 485,102 -> 485,112 -> 487,112 -> 487,111 -> 487,112 -> 489,112 -> 489,105 -> 489,112
+516,150 -> 521,150
+492,26 -> 492,17 -> 492,26 -> 494,26 -> 494,16 -> 494,26 -> 496,26 -> 496,22 -> 496,26 -> 498,26 -> 498,17 -> 498,26 -> 500,26 -> 500,20 -> 500,26 -> 502,26 -> 502,25 -> 502,26 -> 504,26 -> 504,23 -> 504,26 -> 506,26 -> 506,21 -> 506,26 -> 508,26 -> 508,16 -> 508,26 -> 510,26 -> 510,24 -> 510,26
+496,13 -> 501,13
+492,26 -> 492,17 -> 492,26 -> 494,26 -> 494,16 -> 494,26 -> 496,26 -> 496,22 -> 496,26 -> 498,26 -> 498,17 -> 498,26 -> 500,26 -> 500,20 -> 500,26 -> 502,26 -> 502,25 -> 502,26 -> 504,26 -> 504,23 -> 504,26 -> 506,26 -> 506,21 -> 506,26 -> 508,26 -> 508,16 -> 508,26 -> 510,26 -> 510,24 -> 510,26
+492,26 -> 492,17 -> 492,26 -> 494,26 -> 494,16 -> 494,26 -> 496,26 -> 496,22 -> 496,26 -> 498,26 -> 498,17 -> 498,26 -> 500,26 -> 500,20 -> 500,26 -> 502,26 -> 502,25 -> 502,26 -> 504,26 -> 504,23 -> 504,26 -> 506,26 -> 506,21 -> 506,26 -> 508,26 -> 508,16 -> 508,26 -> 510,26 -> 510,24 -> 510,26
+492,26 -> 492,17 -> 492,26 -> 494,26 -> 494,16 -> 494,26 -> 496,26 -> 496,22 -> 496,26 -> 498,26 -> 498,17 -> 498,26 -> 500,26 -> 500,20 -> 500,26 -> 502,26 -> 502,25 -> 502,26 -> 504,26 -> 504,23 -> 504,26 -> 506,26 -> 506,21 -> 506,26 -> 508,26 -> 508,16 -> 508,26 -> 510,26 -> 510,24 -> 510,26
+484,39 -> 484,38 -> 484,39 -> 486,39 -> 486,33 -> 486,39 -> 488,39 -> 488,30 -> 488,39 -> 490,39 -> 490,35 -> 490,39 -> 492,39 -> 492,38 -> 492,39 -> 494,39 -> 494,30 -> 494,39 -> 496,39 -> 496,36 -> 496,39
+492,26 -> 492,17 -> 492,26 -> 494,26 -> 494,16 -> 494,26 -> 496,26 -> 496,22 -> 496,26 -> 498,26 -> 498,17 -> 498,26 -> 500,26 -> 500,20 -> 500,26 -> 502,26 -> 502,25 -> 502,26 -> 504,26 -> 504,23 -> 504,26 -> 506,26 -> 506,21 -> 506,26 -> 508,26 -> 508,16 -> 508,26 -> 510,26 -> 510,24 -> 510,26
+512,147 -> 517,147
+492,26 -> 492,17 -> 492,26 -> 494,26 -> 494,16 -> 494,26 -> 496,26 -> 496,22 -> 496,26 -> 498,26 -> 498,17 -> 498,26 -> 500,26 -> 500,20 -> 500,26 -> 502,26 -> 502,25 -> 502,26 -> 504,26 -> 504,23 -> 504,26 -> 506,26 -> 506,21 -> 506,26 -> 508,26 -> 508,16 -> 508,26 -> 510,26 -> 510,24 -> 510,26
+497,141 -> 502,141
+492,26 -> 492,17 -> 492,26 -> 494,26 -> 494,16 -> 494,26 -> 496,26 -> 496,22 -> 496,26 -> 498,26 -> 498,17 -> 498,26 -> 500,26 -> 500,20 -> 500,26 -> 502,26 -> 502,25 -> 502,26 -> 504,26 -> 504,23 -> 504,26 -> 506,26 -> 506,21 -> 506,26 -> 508,26 -> 508,16 -> 508,26 -> 510,26 -> 510,24 -> 510,26
+460,73 -> 460,70 -> 460,73 -> 462,73 -> 462,69 -> 462,73 -> 464,73 -> 464,65 -> 464,73 -> 466,73 -> 466,65 -> 466,73 -> 468,73 -> 468,64 -> 468,73 -> 470,73 -> 470,68 -> 470,73 -> 472,73 -> 472,68 -> 472,73
+492,26 -> 492,17 -> 492,26 -> 494,26 -> 494,16 -> 494,26 -> 496,26 -> 496,22 -> 496,26 -> 498,26 -> 498,17 -> 498,26 -> 500,26 -> 500,20 -> 500,26 -> 502,26 -> 502,25 -> 502,26 -> 504,26 -> 504,23 -> 504,26 -> 506,26 -> 506,21 -> 506,26 -> 508,26 -> 508,16 -> 508,26 -> 510,26 -> 510,24 -> 510,26
+492,26 -> 492,17 -> 492,26 -> 494,26 -> 494,16 -> 494,26 -> 496,26 -> 496,22 -> 496,26 -> 498,26 -> 498,17 -> 498,26 -> 500,26 -> 500,20 -> 500,26 -> 502,26 -> 502,25 -> 502,26 -> 504,26 -> 504,23 -> 504,26 -> 506,26 -> 506,21 -> 506,26 -> 508,26 -> 508,16 -> 508,26 -> 510,26 -> 510,24 -> 510,26
+484,39 -> 484,38 -> 484,39 -> 486,39 -> 486,33 -> 486,39 -> 488,39 -> 488,30 -> 488,39 -> 490,39 -> 490,35 -> 490,39 -> 492,39 -> 492,38 -> 492,39 -> 494,39 -> 494,30 -> 494,39 -> 496,39 -> 496,36 -> 496,39
+480,162 -> 484,162
+492,26 -> 492,17 -> 492,26 -> 494,26 -> 494,16 -> 494,26 -> 496,26 -> 496,22 -> 496,26 -> 498,26 -> 498,17 -> 498,26 -> 500,26 -> 500,20 -> 500,26 -> 502,26 -> 502,25 -> 502,26 -> 504,26 -> 504,23 -> 504,26 -> 506,26 -> 506,21 -> 506,26 -> 508,26 -> 508,16 -> 508,26 -> 510,26 -> 510,24 -> 510,26
+485,112 -> 485,102 -> 485,112 -> 487,112 -> 487,111 -> 487,112 -> 489,112 -> 489,105 -> 489,112
+489,155 -> 493,155
+460,73 -> 460,70 -> 460,73 -> 462,73 -> 462,69 -> 462,73 -> 464,73 -> 464,65 -> 464,73 -> 466,73 -> 466,65 -> 466,73 -> 468,73 -> 468,64 -> 468,73 -> 470,73 -> 470,68 -> 470,73 -> 472,73 -> 472,68 -> 472,73
+484,39 -> 484,38 -> 484,39 -> 486,39 -> 486,33 -> 486,39 -> 488,39 -> 488,30 -> 488,39 -> 490,39 -> 490,35 -> 490,39 -> 492,39 -> 492,38 -> 492,39 -> 494,39 -> 494,30 -> 494,39 -> 496,39 -> 496,36 -> 496,39
+460,73 -> 460,70 -> 460,73 -> 462,73 -> 462,69 -> 462,73 -> 464,73 -> 464,65 -> 464,73 -> 466,73 -> 466,65 -> 466,73 -> 468,73 -> 468,64 -> 468,73 -> 470,73 -> 470,68 -> 470,73 -> 472,73 -> 472,68 -> 472,73
+460,73 -> 460,70 -> 460,73 -> 462,73 -> 462,69 -> 462,73 -> 464,73 -> 464,65 -> 464,73 -> 466,73 -> 466,65 -> 466,73 -> 468,73 -> 468,64 -> 468,73 -> 470,73 -> 470,68 -> 470,73 -> 472,73 -> 472,68 -> 472,73
+492,26 -> 492,17 -> 492,26 -> 494,26 -> 494,16 -> 494,26 -> 496,26 -> 496,22 -> 496,26 -> 498,26 -> 498,17 -> 498,26 -> 500,26 -> 500,20 -> 500,26 -> 502,26 -> 502,25 -> 502,26 -> 504,26 -> 504,23 -> 504,26 -> 506,26 -> 506,21 -> 506,26 -> 508,26 -> 508,16 -> 508,26 -> 510,26 -> 510,24 -> 510,26
+498,157 -> 502,157
+460,73 -> 460,70 -> 460,73 -> 462,73 -> 462,69 -> 462,73 -> 464,73 -> 464,65 -> 464,73 -> 466,73 -> 466,65 -> 466,73 -> 468,73 -> 468,64 -> 468,73 -> 470,73 -> 470,68 -> 470,73 -> 472,73 -> 472,68 -> 472,73
+460,73 -> 460,70 -> 460,73 -> 462,73 -> 462,69 -> 462,73 -> 464,73 -> 464,65 -> 464,73 -> 466,73 -> 466,65 -> 466,73 -> 468,73 -> 468,64 -> 468,73 -> 470,73 -> 470,68 -> 470,73 -> 472,73 -> 472,68 -> 472,73
+492,26 -> 492,17 -> 492,26 -> 494,26 -> 494,16 -> 494,26 -> 496,26 -> 496,22 -> 496,26 -> 498,26 -> 498,17 -> 498,26 -> 500,26 -> 500,20 -> 500,26 -> 502,26 -> 502,25 -> 502,26 -> 504,26 -> 504,23 -> 504,26 -> 506,26 -> 506,21 -> 506,26 -> 508,26 -> 508,16 -> 508,26 -> 510,26 -> 510,24 -> 510,26
+491,147 -> 496,147
+484,39 -> 484,38 -> 484,39 -> 486,39 -> 486,33 -> 486,39 -> 488,39 -> 488,30 -> 488,39 -> 490,39 -> 490,35 -> 490,39 -> 492,39 -> 492,38 -> 492,39 -> 494,39 -> 494,30 -> 494,39 -> 496,39 -> 496,36 -> 496,39
+484,39 -> 484,38 -> 484,39 -> 486,39 -> 486,33 -> 486,39 -> 488,39 -> 488,30 -> 488,39 -> 490,39 -> 490,35 -> 490,39 -> 492,39 -> 492,38 -> 492,39 -> 494,39 -> 494,30 -> 494,39 -> 496,39 -> 496,36 -> 496,39
+489,115 -> 489,119 -> 481,119 -> 481,126 -> 494,126 -> 494,119 -> 493,119 -> 493,115
+484,39 -> 484,38 -> 484,39 -> 486,39 -> 486,33 -> 486,39 -> 488,39 -> 488,30 -> 488,39 -> 490,39 -> 490,35 -> 490,39 -> 492,39 -> 492,38 -> 492,39 -> 494,39 -> 494,30 -> 494,39 -> 496,39 -> 496,36 -> 496,39
+484,39 -> 484,38 -> 484,39 -> 486,39 -> 486,33 -> 486,39 -> 488,39 -> 488,30 -> 488,39 -> 490,39 -> 490,35 -> 490,39 -> 492,39 -> 492,38 -> 492,39 -> 494,39 -> 494,30 -> 494,39 -> 496,39 -> 496,36 -> 496,39
+492,26 -> 492,17 -> 492,26 -> 494,26 -> 494,16 -> 494,26 -> 496,26 -> 496,22 -> 496,26 -> 498,26 -> 498,17 -> 498,26 -> 500,26 -> 500,20 -> 500,26 -> 502,26 -> 502,25 -> 502,26 -> 504,26 -> 504,23 -> 504,26 -> 506,26 -> 506,21 -> 506,26 -> 508,26 -> 508,16 -> 508,26 -> 510,26 -> 510,24 -> 510,26
+470,76 -> 470,80 -> 466,80 -> 466,84 -> 481,84 -> 481,80 -> 474,80 -> 474,76
+492,26 -> 492,17 -> 492,26 -> 494,26 -> 494,16 -> 494,26 -> 496,26 -> 496,22 -> 496,26 -> 498,26 -> 498,17 -> 498,26 -> 500,26 -> 500,20 -> 500,26 -> 502,26 -> 502,25 -> 502,26 -> 504,26 -> 504,23 -> 504,26 -> 506,26 -> 506,21 -> 506,26 -> 508,26 -> 508,16 -> 508,26 -> 510,26 -> 510,24 -> 510,26
+492,26 -> 492,17 -> 492,26 -> 494,26 -> 494,16 -> 494,26 -> 496,26 -> 496,22 -> 496,26 -> 498,26 -> 498,17 -> 498,26 -> 500,26 -> 500,20 -> 500,26 -> 502,26 -> 502,25 -> 502,26 -> 504,26 -> 504,23 -> 504,26 -> 506,26 -> 506,21 -> 506,26 -> 508,26 -> 508,16 -> 508,26 -> 510,26 -> 510,24 -> 510,26
+475,88 -> 475,89 -> 483,89 -> 483,88
+460,73 -> 460,70 -> 460,73 -> 462,73 -> 462,69 -> 462,73 -> 464,73 -> 464,65 -> 464,73 -> 466,73 -> 466,65 -> 466,73 -> 468,73 -> 468,64 -> 468,73 -> 470,73 -> 470,68 -> 470,73 -> 472,73 -> 472,68 -> 472,73
+486,162 -> 490,162
+460,73 -> 460,70 -> 460,73 -> 462,73 -> 462,69 -> 462,73 -> 464,73 -> 464,65 -> 464,73 -> 466,73 -> 466,65 -> 466,73 -> 468,73 -> 468,64 -> 468,73 -> 470,73 -> 470,68 -> 470,73 -> 472,73 -> 472,68 -> 472,73
+508,144 -> 513,144
+481,92 -> 481,96 -> 476,96 -> 476,99 -> 487,99 -> 487,96 -> 485,96 -> 485,92
+460,73 -> 460,70 -> 460,73 -> 462,73 -> 462,69 -> 462,73 -> 464,73 -> 464,65 -> 464,73 -> 466,73 -> 466,65 -> 466,73 -> 468,73 -> 468,64 -> 468,73 -> 470,73 -> 470,68 -> 470,73 -> 472,73 -> 472,68 -> 472,73
+470,49 -> 470,53 -> 468,53 -> 468,60 -> 477,60 -> 477,53 -> 476,53 -> 476,49
+477,164 -> 481,164
+485,112 -> 485,102 -> 485,112 -> 487,112 -> 487,111 -> 487,112 -> 489,112 -> 489,105 -> 489,112
+504,141 -> 509,141
+489,164 -> 493,164
+480,42 -> 485,42
+484,39 -> 484,38 -> 484,39 -> 486,39 -> 486,33 -> 486,39 -> 488,39 -> 488,30 -> 488,39 -> 490,39 -> 490,35 -> 490,39 -> 492,39 -> 492,38 -> 492,39 -> 494,39 -> 494,30 -> 494,39 -> 496,39 -> 496,36 -> 496,39
+470,49 -> 470,53 -> 468,53 -> 468,60 -> 477,60 -> 477,53 -> 476,53 -> 476,49
+485,112 -> 485,102 -> 485,112 -> 487,112 -> 487,111 -> 487,112 -> 489,112 -> 489,105 -> 489,112
+484,39 -> 484,38 -> 484,39 -> 486,39 -> 486,33 -> 486,39 -> 488,39 -> 488,30 -> 488,39 -> 490,39 -> 490,35 -> 490,39 -> 492,39 -> 492,38 -> 492,39 -> 494,39 -> 494,30 -> 494,39 -> 496,39 -> 496,36 -> 496,39
+489,115 -> 489,119 -> 481,119 -> 481,126 -> 494,126 -> 494,119 -> 493,119 -> 493,115
+486,157 -> 490,157
+460,73 -> 460,70 -> 460,73 -> 462,73 -> 462,69 -> 462,73 -> 464,73 -> 464,65 -> 464,73 -> 466,73 -> 466,65 -> 466,73 -> 468,73 -> 468,64 -> 468,73 -> 470,73 -> 470,68 -> 470,73 -> 472,73 -> 472,68 -> 472,73
+492,26 -> 492,17 -> 492,26 -> 494,26 -> 494,16 -> 494,26 -> 496,26 -> 496,22 -> 496,26 -> 498,26 -> 498,17 -> 498,26 -> 500,26 -> 500,20 -> 500,26 -> 502,26 -> 502,25 -> 502,26 -> 504,26 -> 504,23 -> 504,26 -> 506,26 -> 506,21 -> 506,26 -> 508,26 -> 508,16 -> 508,26 -> 510,26 -> 510,24 -> 510,26
+470,76 -> 470,80 -> 466,80 -> 466,84 -> 481,84 -> 481,80 -> 474,80 -> 474,76
+485,112 -> 485,102 -> 485,112 -> 487,112 -> 487,111 -> 487,112 -> 489,112 -> 489,105 -> 489,112
+501,144 -> 506,144
+484,39 -> 484,38 -> 484,39 -> 486,39 -> 486,33 -> 486,39 -> 488,39 -> 488,30 -> 488,39 -> 490,39 -> 490,35 -> 490,39 -> 492,39 -> 492,38 -> 492,39 -> 494,39 -> 494,30 -> 494,39 -> 496,39 -> 496,36 -> 496,39
+485,112 -> 485,102 -> 485,112 -> 487,112 -> 487,111 -> 487,112 -> 489,112 -> 489,105 -> 489,112
+470,76 -> 470,80 -> 466,80 -> 466,84 -> 481,84 -> 481,80 -> 474,80 -> 474,76
+492,26 -> 492,17 -> 492,26 -> 494,26 -> 494,16 -> 494,26 -> 496,26 -> 496,22 -> 496,26 -> 498,26 -> 498,17 -> 498,26 -> 500,26 -> 500,20 -> 500,26 -> 502,26 -> 502,25 -> 502,26 -> 504,26 -> 504,23 -> 504,26 -> 506,26 -> 506,21 -> 506,26 -> 508,26 -> 508,16 -> 508,26 -> 510,26 -> 510,24 -> 510,26
+460,73 -> 460,70 -> 460,73 -> 462,73 -> 462,69 -> 462,73 -> 464,73 -> 464,65 -> 464,73 -> 466,73 -> 466,65 -> 466,73 -> 468,73 -> 468,64 -> 468,73 -> 470,73 -> 470,68 -> 470,73 -> 472,73 -> 472,68 -> 472,73
+492,166 -> 496,166
+509,150 -> 514,150
+484,39 -> 484,38 -> 484,39 -> 486,39 -> 486,33 -> 486,39 -> 488,39 -> 488,30 -> 488,39 -> 490,39 -> 490,35 -> 490,39 -> 492,39 -> 492,38 -> 492,39 -> 494,39 -> 494,30 -> 494,39 -> 496,39 -> 496,36 -> 496,39
+480,134 -> 480,135 -> 500,135 -> 500,134
+460,73 -> 460,70 -> 460,73 -> 462,73 -> 462,69 -> 462,73 -> 464,73 -> 464,65 -> 464,73 -> 466,73 -> 466,65 -> 466,73 -> 468,73 -> 468,64 -> 468,73 -> 470,73 -> 470,68 -> 470,73 -> 472,73 -> 472,68 -> 472,73
+486,166 -> 490,166
+494,144 -> 499,144
+481,92 -> 481,96 -> 476,96 -> 476,99 -> 487,99 -> 487,96 -> 485,96 -> 485,92
+460,73 -> 460,70 -> 460,73 -> 462,73 -> 462,69 -> 462,73 -> 464,73 -> 464,65 -> 464,73 -> 466,73 -> 466,65 -> 466,73 -> 468,73 -> 468,64 -> 468,73 -> 470,73 -> 470,68 -> 470,73 -> 472,73 -> 472,68 -> 472,73
+484,39 -> 484,38 -> 484,39 -> 486,39 -> 486,33 -> 486,39 -> 488,39 -> 488,30 -> 488,39 -> 490,39 -> 490,35 -> 490,39 -> 492,39 -> 492,38 -> 492,39 -> 494,39 -> 494,30 -> 494,39 -> 496,39 -> 496,36 -> 496,39
+460,73 -> 460,70 -> 460,73 -> 462,73 -> 462,69 -> 462,73 -> 464,73 -> 464,65 -> 464,73 -> 466,73 -> 466,65 -> 466,73 -> 468,73 -> 468,64 -> 468,73 -> 470,73 -> 470,68 -> 470,73 -> 472,73 -> 472,68 -> 472,73
+484,39 -> 484,38 -> 484,39 -> 486,39 -> 486,33 -> 486,39 -> 488,39 -> 488,30 -> 488,39 -> 490,39 -> 490,35 -> 490,39 -> 492,39 -> 492,38 -> 492,39 -> 494,39 -> 494,30 -> 494,39 -> 496,39 -> 496,36 -> 496,39
+484,39 -> 484,38 -> 484,39 -> 486,39 -> 486,33 -> 486,39 -> 488,39 -> 488,30 -> 488,39 -> 490,39 -> 490,35 -> 490,39 -> 492,39 -> 492,38 -> 492,39 -> 494,39 -> 494,30 -> 494,39 -> 496,39 -> 496,36 -> 496,39
+480,134 -> 480,135 -> 500,135 -> 500,134
+481,46 -> 486,46
+477,44 -> 482,44
+470,49 -> 470,53 -> 468,53 -> 468,60 -> 477,60 -> 477,53 -> 476,53 -> 476,49
+491,131 -> 502,131 -> 502,130
+492,157 -> 496,157
+484,39 -> 484,38 -> 484,39 -> 486,39 -> 486,33 -> 486,39 -> 488,39 -> 488,30 -> 488,39 -> 490,39 -> 490,35 -> 490,39 -> 492,39 -> 492,38 -> 492,39 -> 494,39 -> 494,30 -> 494,39 -> 496,39 -> 496,36 -> 496,39
+488,150 -> 493,150
+481,92 -> 481,96 -> 476,96 -> 476,99 -> 487,99 -> 487,96 -> 485,96 -> 485,92
+474,46 -> 479,46
+484,39 -> 484,38 -> 484,39 -> 486,39 -> 486,33 -> 486,39 -> 488,39 -> 488,30 -> 488,39 -> 490,39 -> 490,35 -> 490,39 -> 492,39 -> 492,38 -> 492,39 -> 494,39 -> 494,30 -> 494,39 -> 496,39 -> 496,36 -> 496,39
+489,115 -> 489,119 -> 481,119 -> 481,126 -> 494,126 -> 494,119 -> 493,119 -> 493,115
+460,73 -> 460,70 -> 460,73 -> 462,73 -> 462,69 -> 462,73 -> 464,73 -> 464,65 -> 464,73 -> 466,73 -> 466,65 -> 466,73 -> 468,73 -> 468,64 -> 468,73 -> 470,73 -> 470,68 -> 470,73 -> 472,73 -> 472,68 -> 472,73
+489,115 -> 489,119 -> 481,119 -> 481,126 -> 494,126 -> 494,119 -> 493,119 -> 493,115
+492,26 -> 492,17 -> 492,26 -> 494,26 -> 494,16 -> 494,26 -> 496,26 -> 496,22 -> 496,26 -> 498,26 -> 498,17 -> 498,26 -> 500,26 -> 500,20 -> 500,26 -> 502,26 -> 502,25 -> 502,26 -> 504,26 -> 504,23 -> 504,26 -> 506,26 -> 506,21 -> 506,26 -> 508,26 -> 508,16 -> 508,26 -> 510,26 -> 510,24 -> 510,26
+470,76 -> 470,80 -> 466,80 -> 466,84 -> 481,84 -> 481,80 -> 474,80 -> 474,76
+488,46 -> 493,46
+495,150 -> 500,150
+474,166 -> 478,166
+492,26 -> 492,17 -> 492,26 -> 494,26 -> 494,16 -> 494,26 -> 496,26 -> 496,22 -> 496,26 -> 498,26 -> 498,17 -> 498,26 -> 500,26 -> 500,20 -> 500,26 -> 502,26 -> 502,25 -> 502,26 -> 504,26 -> 504,23 -> 504,26 -> 506,26 -> 506,21 -> 506,26 -> 508,26 -> 508,16 -> 508,26 -> 510,26 -> 510,24 -> 510,26
+484,44 -> 489,44
+484,39 -> 484,38 -> 484,39 -> 486,39 -> 486,33 -> 486,39 -> 488,39 -> 488,30 -> 488,39 -> 490,39 -> 490,35 -> 490,39 -> 492,39 -> 492,38 -> 492,39 -> 494,39 -> 494,30 -> 494,39 -> 496,39 -> 496,36 -> 496,39
+484,39 -> 484,38 -> 484,39 -> 486,39 -> 486,33 -> 486,39 -> 488,39 -> 488,30 -> 488,39 -> 490,39 -> 490,35 -> 490,39 -> 492,39 -> 492,38 -> 492,39 -> 494,39 -> 494,30 -> 494,39 -> 496,39 -> 496,36 -> 496,39
+489,115 -> 489,119 -> 481,119 -> 481,126 -> 494,126 -> 494,119 -> 493,119 -> 493,115
+481,92 -> 481,96 -> 476,96 -> 476,99 -> 487,99 -> 487,96 -> 485,96 -> 485,92
+492,26 -> 492,17 -> 492,26 -> 494,26 -> 494,16 -> 494,26 -> 496,26 -> 496,22 -> 496,26 -> 498,26 -> 498,17 -> 498,26 -> 500,26 -> 500,20 -> 500,26 -> 502,26 -> 502,25 -> 502,26 -> 504,26 -> 504,23 -> 504,26 -> 506,26 -> 506,21 -> 506,26 -> 508,26 -> 508,16 -> 508,26 -> 510,26 -> 510,24 -> 510,26
+492,26 -> 492,17 -> 492,26 -> 494,26 -> 494,16 -> 494,26 -> 496,26 -> 496,22 -> 496,26 -> 498,26 -> 498,17 -> 498,26 -> 500,26 -> 500,20 -> 500,26 -> 502,26 -> 502,25 -> 502,26 -> 504,26 -> 504,23 -> 504,26 -> 506,26 -> 506,21 -> 506,26 -> 508,26 -> 508,16 -> 508,26 -> 510,26 -> 510,24 -> 510,26
+489,115 -> 489,119 -> 481,119 -> 481,126 -> 494,126 -> 494,119 -> 493,119 -> 493,115
+492,153 -> 496,153
+502,150 -> 507,150
+470,49 -> 470,53 -> 468,53 -> 468,60 -> 477,60 -> 477,53 -> 476,53 -> 476,49
+475,88 -> 475,89 -> 483,89 -> 483,88
+480,134 -> 480,135 -> 500,135 -> 500,134
+470,76 -> 470,80 -> 466,80 -> 466,84 -> 481,84 -> 481,80 -> 474,80 -> 474,76
+492,26 -> 492,17 -> 492,26 -> 494,26 -> 494,16 -> 494,26 -> 496,26 -> 496,22 -> 496,26 -> 498,26 -> 498,17 -> 498,26 -> 500,26 -> 500,20 -> 500,26 -> 502,26 -> 502,25 -> 502,26 -> 504,26 -> 504,23 -> 504,26 -> 506,26 -> 506,21 -> 506,26 -> 508,26 -> 508,16 -> 508,26 -> 510,26 -> 510,24 -> 510,26
+480,166 -> 484,166
+470,49 -> 470,53 -> 468,53 -> 468,60 -> 477,60 -> 477,53 -> 476,53 -> 476,49
+470,76 -> 470,80 -> 466,80 -> 466,84 -> 481,84 -> 481,80 -> 474,80 -> 474,76
+485,112 -> 485,102 -> 485,112 -> 487,112 -> 487,111 -> 487,112 -> 489,112 -> 489,105 -> 489,112
+470,49 -> 470,53 -> 468,53 -> 468,60 -> 477,60 -> 477,53 -> 476,53 -> 476,49

day14/src/main.rs

@@ -0,0 +1,105 @@
+use std::env;
+use std::fs::File;
+use std::io::{BufReader, BufRead};
+use std::cmp::{min, max};
+
+fn parse_num(s: &[u8]) -> (usize, usize) {
+    let mut num: usize = 0;
+    let mut len = 0;
+    for i in 0..s.len() {
+        if s[i].is_ascii_digit() {
+            num = num*10 + (s[i] as usize - '0' as usize);
+            len += 1;
+        } else {
+            break;
+        }
+    }
+    (num, len)
+}
+
+fn print_map(map: &Vec<Vec<char>>) {
+    for row in map {
+        let s: String = row.iter().collect();
+        println!("{}", s);
+    }
+    println!("");
+}
+
+fn main() {
+    let file = File::open(&env::args().nth(1).expect("input")).expect("io err");
+    let lines = BufReader::new(file).lines();
+    let (mut minx, mut miny, mut maxx, mut maxy) =
+        (usize::MAX, usize::MAX, 0, 0);
+    let mut lists: Vec<Vec<(usize, usize)>> = Vec::new();
+
+    for line in lines.flatten() {
+        let l_bytes = line.as_bytes();
+        let mut cursor = 0;
+        let mut list: Vec<(usize, usize)> = Vec::new();
+        while cursor < l_bytes.len() {
+            let (x, lenx) = parse_num(&l_bytes[cursor..]);
+            let (y, leny) = parse_num(&l_bytes[cursor + lenx + 1..]);
+            list.push((x, y));
+            minx = if x < minx {x} else {minx};
+            miny = if y < miny {y} else {miny};
+            maxx = if x > maxx {x} else {maxx};
+            maxy = if y > maxy {y} else {maxy};
+            cursor = cursor + lenx + 1 + leny + 4;
+        }
+        lists.push(list);
+    }
+
+    // part2 hack here
+    minx = 0;
+    maxx = 1000;
+    maxy = maxy + 2;
+    lists.push(vec![(minx, maxy), (maxx, maxy)]);
+
+    println!("{:?} {:?} {:?} {:?}", minx, miny, maxx, maxy);
+    let mut map: Vec<Vec<char>> =
+        vec![vec!['.'; maxx - minx + 3]; maxy + 1];
+    for list in lists {
+        let (mut xprev, mut yprev) = &list[0];
+        for (x, y) in &list[1..] {
+            if *x == xprev {
+                for ty in *min(y, &yprev)..=*max(y, &yprev) {
+                    map[ty][*x - minx + 1] = '#';
+                }
+            } else if *y == yprev {
+                for tx in *min(x, &xprev)..=*max(x, &xprev) {
+                    map[*y][tx - minx + 1] = '#';
+                }
+            }
+            xprev = *x;
+            yprev = *y;
+        }
+    }
+    print_map(&map);
+
+    let mut total = 0;
+    'map: loop {
+        let (mut rockx, mut rocky) = (500, 0);
+        'rock: loop {
+            //println!("{:?}, {:?}", rockx, rocky);
+            if map[rocky + 1][rockx + 1 - minx] == '.' {
+                rocky = rocky + 1;
+            } else if map[rocky + 1][rockx + 1 - minx - 1] == '.' {
+                rocky = rocky + 1;
+                rockx = rockx - 1;
+            } else if map[rocky + 1][rockx + 1 - minx + 1] == '.' {
+                rocky = rocky + 1;
+                rockx = rockx + 1;
+            } else {
+                map[rocky][rockx - minx + 1] = 'o';
+                total += 1;
+                if rockx == 500 && rocky == 0 {
+                    break 'map;
+                }
+                //print_map(&map);
+                break 'rock;
+            }
+        }
+    }
+    print_map(&map);
+    println!("{:?}", total);
+}

day14/src/main1.rs

@@ -0,0 +1,97 @@
+use std::env;
+use std::fs::File;
+use std::io::{BufReader, BufRead};
+use std::cmp::{min, max};
+
+fn parse_num(s: &[u8]) -> (usize, usize) {
+    let mut num: usize = 0;
+    let mut len = 0;
+    for i in 0..s.len() {
+        if s[i].is_ascii_digit() {
+            num = num*10 + (s[i] as usize - '0' as usize);
+            len += 1;
+        } else {
+            break;
+        }
+    }
+    (num, len)
+}
+
+fn print_map(map: &Vec<Vec<char>>) {
+    for row in map {
+        let s: String = row.iter().collect();
+        println!("{}", s);
+    }
+    println!("");
+}
+
+fn main() {
+    let file = File::open(&env::args().nth(1).expect("input")).expect("io err");
+    let lines = BufReader::new(file).lines();
+    let (mut minx, mut miny, mut maxx, mut maxy) =
+        (usize::MAX, usize::MAX, 0, 0);
+    let mut lists: Vec<Vec<(usize, usize)>> = Vec::new();
+
+    for line in lines.flatten() {
+        let l_bytes = line.as_bytes();
+        let mut cursor = 0;
+        let mut list: Vec<(usize, usize)> = Vec::new();
+        while cursor < l_bytes.len() {
+            let (x, lenx) = parse_num(&l_bytes[cursor..]);
+            let (y, leny) = parse_num(&l_bytes[cursor + lenx + 1..]);
+            list.push((x, y));
+            minx = if x < minx {x} else {minx};
+            miny = if y < miny {y} else {miny};
+            maxx = if x > maxx {x} else {maxx};
+            maxy = if y > maxy {y} else {maxy};
+            cursor = cursor + lenx + 1 + leny + 4;
+        }
+        lists.push(list);
+    }
+    println!("{:?} {:?} {:?} {:?}", minx, miny, maxx, maxy);
+    let mut map: Vec<Vec<char>> =
+        vec![vec!['.'; maxx - minx + 3]; maxy + 1];
+    for list in lists {
+        let (mut xprev, mut yprev) = &list[0];
+        for (x, y) in &list[1..] {
+            if *x == xprev {
+                for ty in *min(y, &yprev)..=*max(y, &yprev) {
+                    map[ty][*x - minx + 1] = '#';
+                }
+            } else if *y == yprev {
+                for tx in *min(x, &xprev)..=*max(x, &xprev) {
+                    map[*y][tx - minx + 1] = '#';
+                }
+            }
+            xprev = *x;
+            yprev = *y;
+        }
+    }
+    print_map(&map);
+
+    let mut total = 0;
+    'map: loop {
+        let (mut rockx, mut rocky) = (500, 0);
+        'rock: loop {
+            //println!("{:?}, {:?}", rockx, rocky);
+            if rockx < minx || rockx > maxx || rocky == maxy {
+                break 'map;
+            } else if map[rocky + 1][rockx + 1 - minx] == '.' {
+                rocky = rocky + 1;
+            } else if map[rocky + 1][rockx + 1 - minx - 1] == '.' {
+                rocky = rocky + 1;
+                rockx = rockx - 1;
+            } else if map[rocky + 1][rockx + 1 - minx + 1] == '.' {
+                rocky = rocky + 1;
+                rockx = rockx + 1;
+            } else {
+                map[rocky][rockx - minx + 1] = 'o';
+                total += 1;
+                //print_map(&map);
+                break 'rock;
+            }
+        }
+    }
+    print_map(&map);
+    println!("{:?}", total);
+}

day14/test.txt

@@ -0,0 +1,2 @@
+498,4 -> 498,6 -> 496,6
+503,4 -> 502,4 -> 502,9 -> 494,9

day15/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day15"
+version = "0.1.0"

day15/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day15"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day15/input.txt

@@ -0,0 +1,33 @@
+Sensor at x=2899860, y=3122031: closest beacon is at x=2701269, y=3542780
+Sensor at x=1836719, y=1116779: closest beacon is at x=2037055, y=2000000
+Sensor at x=3995802, y=2706630: closest beacon is at x=3944538, y=3053285
+Sensor at x=2591204, y=2008272: closest beacon is at x=2597837, y=2509170
+Sensor at x=2546593, y=1538222: closest beacon is at x=2037055, y=2000000
+Sensor at x=252214, y=61954: closest beacon is at x=1087565, y=-690123
+Sensor at x=950, y=1106672: closest beacon is at x=-893678, y=1276864
+Sensor at x=1349445, y=1752783: closest beacon is at x=2037055, y=2000000
+Sensor at x=3195828, y=3483667: closest beacon is at x=3334657, y=3531523
+Sensor at x=2057761, y=2154359: closest beacon is at x=2037055, y=2000000
+Sensor at x=2315350, y=3364640: closest beacon is at x=2701269, y=3542780
+Sensor at x=327139, y=2426600: closest beacon is at x=-88420, y=3646947
+Sensor at x=3943522, y=2854345: closest beacon is at x=3944538, y=3053285
+Sensor at x=3358620, y=516881: closest beacon is at x=3260516, y=2246079
+Sensor at x=1788376, y=8679: closest beacon is at x=1087565, y=-690123
+Sensor at x=3344883, y=3537985: closest beacon is at x=3334657, y=3531523
+Sensor at x=2961064, y=2697125: closest beacon is at x=2597837, y=2509170
+Sensor at x=3780090, y=2093546: closest beacon is at x=3260516, y=2246079
+Sensor at x=3291917, y=3398703: closest beacon is at x=3334657, y=3531523
+Sensor at x=3999864, y=2998005: closest beacon is at x=3944538, y=3053285
+Sensor at x=2919272, y=3732950: closest beacon is at x=2701269, y=3542780
+Sensor at x=2057404, y=2947435: closest beacon is at x=2037055, y=2000000
+Sensor at x=1072126, y=645784: closest beacon is at x=1087565, y=-690123
+Sensor at x=3549465, y=2554712: closest beacon is at x=3260516, y=2246079
+Sensor at x=3550313, y=3121694: closest beacon is at x=3944538, y=3053285
+Sensor at x=3405149, y=3483630: closest beacon is at x=3334657, y=3531523
+Sensor at x=2600212, y=3961193: closest beacon is at x=2701269, y=3542780
+Sensor at x=1102632, y=3932527: closest beacon is at x=-88420, y=3646947
+Sensor at x=67001, y=3506079: closest beacon is at x=-88420, y=3646947
+Sensor at x=3994250, y=3975025: closest beacon is at x=3944538, y=3053285
+Sensor at x=3019750, y=2125144: closest beacon is at x=3260516, y=2246079
+Sensor at x=3282319, y=3656404: closest beacon is at x=3334657, y=3531523
+Sensor at x=2797371, y=3645126: closest beacon is at x=2701269, y=3542780

day15/src/main.rs

@@ -0,0 +1,83 @@
+use std::env;
+use std::fs::File;
+use std::io::{BufReader, BufRead};
+use std::cmp::{min, max};
+use std::collections::HashSet;
+
+fn parse_num(s: &[u8]) -> (i64, usize) {
+    let mut num: i64 = 0;
+    let negative = s[0] == '-' as u8;
+    let start = if negative {1} else {0};
+    let mut len = if negative {1} else {0};
+
+    for i in start..s.len() {
+        if s[i].is_ascii_digit() {
+            num = num*10 + (s[i] as i64 - '0' as i64);
+            len += 1;
+        } else {
+            break;
+        }
+    }
+    (if negative {-num} else {num}, len)
+}
+
+fn combine(ranges: &mut Vec<(i64, i64)>, l: i64, r: i64) {
+    for (l0, r0) in ranges.iter_mut() {
+        if *l0 <= r && l <= *r0 {
+            *l0 = min(*l0, l);
+            *r0 = max(*r0, r);
+            return;
+        }
+    }
+    if ranges.len() > 0 {
+        let (_, last_r) = ranges.last_mut().unwrap();
+        if l == *last_r + 1 {
+            *last_r = r;
+            return;
+        }
+    }       
+    ranges.push((l, r));
+}
+
+fn main() {
+    let file = File::open(&env::args().nth(1).expect("input")).expect("io err");
+    let lines = BufReader::new(file).lines();
+    let mut sensors: Vec<(i64, i64, u64)> = Vec::new();
+    let mut beacons: HashSet<(i64, i64)> = HashSet::new();
+    for line in lines.flatten() {
+        let l_bytes = line.as_bytes();
+        let (sx, e1) = parse_num(&l_bytes[12..]);
+        let (sy, e2) = parse_num(&l_bytes[12 + e1 + 4..]);
+        let (bx, e3) = parse_num(&l_bytes[12 + e1 + 4 + e2 + 25..]);
+        let (by, _) = parse_num(&l_bytes[12 + e1 + 4 + e2 + 25 + e3 + 4..]);
+        sensors.push((sx, sy, ((bx - sx).abs() + (by - sy).abs()) as u64));
+        beacons.insert((bx, by));
+    }
+    sensors.sort_by_key(|(x, _, _)| *x);
+    println!("{:?}", sensors);
+    println!("{:?}", beacons);
+
+    let max_y = &env::args().nth(2).expect("max y").parse::<i64>().unwrap();
+    for target_y in 0..=*max_y {
+        let mut line_coverages: Vec<(i64, i64)> = Vec::new();
+        for (sx, sy, range) in &sensors {
+            let clip = (*range as i64) - (sy - target_y).abs();
+            if clip < 0 {
+                continue;
+            }
+            let startx = sx - clip;
+            let endx = sx + clip;
+            line_coverages.push((startx, endx)); 
+        }
+        line_coverages.sort_by_key(|(x, _)| *x);
+        let mut coverage: Vec<(i64, i64)> = Vec::new();
+        for (startx, endx) in line_coverages {
+            combine(&mut coverage, startx, endx);
+        }
+        if coverage.len() > 1 {
+            let score = 4000000 * (coverage[0].1 + 1) + target_y;
+            println!("{:?} --> {:?}", coverage, score);
+            break;
+        }
+    }
+}

day15/src/main1.rs

@@ -0,0 +1,78 @@
+use std::env;
+use std::fs::File;
+use std::io::{BufReader, BufRead};
+use std::cmp::{min, max};
+use std::collections::HashSet;
+
+fn parse_num(s: &[u8]) -> (i64, usize) {
+    let mut num: i64 = 0;
+    let negative = s[0] == '-' as u8;
+    let start = if negative {1} else {0};
+    let mut len = if negative {1} else {0};
+
+    for i in start..s.len() {
+        if s[i].is_ascii_digit() {
+            num = num*10 + (s[i] as i64 - '0' as i64);
+            len += 1;
+        } else {
+            break;
+        }
+    }
+    (if negative {-num} else {num}, len)
+}
+
+fn combine(ranges: &mut Vec<(i64, i64)>, l: i64, r: i64) {
+    for (l0, r0) in ranges.iter_mut() {
+        if *l0 <= r && l <= *r0 {
+            *l0 = min(*l0, l);
+            *r0 = max(*r0, r);
+            return;
+        }
+    }
+    ranges.push((l, r));
+}
+
+fn main() {
+    let file = File::open(&env::args().nth(1).expect("input")).expect("io err");
+    let lines = BufReader::new(file).lines();
+    let mut sensors: Vec<(i64, i64, u64)> = Vec::new();
+    let mut beacons: HashSet<(i64, i64)> = HashSet::new();
+    for line in lines.flatten() {
+        let l_bytes = line.as_bytes();
+        let (sx, e1) = parse_num(&l_bytes[12..]);
+        let (sy, e2) = parse_num(&l_bytes[12 + e1 + 4..]);
+        let (bx, e3) = parse_num(&l_bytes[12 + e1 + 4 + e2 + 25..]);
+        let (by, _) = parse_num(&l_bytes[12 + e1 + 4 + e2 + 25 + e3 + 4..]);
+        sensors.push((sx, sy, ((bx - sx).abs() + (by - sy).abs()) as u64));
+        beacons.insert((bx, by));
+    }
+    sensors.sort_by_key(|(x, _, _)| *x);
+    println!("{:?}", sensors);
+    println!("{:?}", beacons);
+
+    let target_y = &env::args().nth(2).expect("line").parse::<i64>().unwrap();
+    let mut coverage: Vec<(i64, i64)> = Vec::new();
+    for (sx, sy, range) in sensors {
+        let clip = (range as i64) - (sy - target_y).abs();
+        if clip < 0 {
+            continue;
+        }
+        let startx = sx - clip;
+        let endx = sx + clip;
+        combine(&mut coverage, startx, endx);
+         
+    }
+    println!("{:?}", coverage);
+
+    let mut sum = 0;
+    for (l, r) in coverage {
+        let mut overlap = 0;
+        for (bx, by) in &beacons {
+            if *by == *target_y && l <= *bx && r >= *bx {
+                overlap += 1;
+            }
+        }
+        sum += r - l + 1 - overlap;
+    }
+    println!("answer: {:?}", sum);
+}

day15/test.txt

@@ -0,0 +1,14 @@
+Sensor at x=2, y=18: closest beacon is at x=-2, y=15
+Sensor at x=9, y=16: closest beacon is at x=10, y=16
+Sensor at x=13, y=2: closest beacon is at x=15, y=3
+Sensor at x=12, y=14: closest beacon is at x=10, y=16
+Sensor at x=10, y=20: closest beacon is at x=10, y=16
+Sensor at x=14, y=17: closest beacon is at x=10, y=16
+Sensor at x=8, y=7: closest beacon is at x=2, y=10
+Sensor at x=2, y=0: closest beacon is at x=2, y=10
+Sensor at x=0, y=11: closest beacon is at x=2, y=10
+Sensor at x=20, y=14: closest beacon is at x=25, y=17
+Sensor at x=17, y=20: closest beacon is at x=21, y=22
+Sensor at x=16, y=7: closest beacon is at x=15, y=3
+Sensor at x=14, y=3: closest beacon is at x=15, y=3
+Sensor at x=20, y=1: closest beacon is at x=15, y=3

day16/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day16"
+version = "0.1.0"

day16/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day16"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day16/input.txt

@@ -0,0 +1,52 @@
+Valve AP has flow rate=0; tunnels lead to valves AA, ON
+Valve QN has flow rate=21; tunnels lead to valves RI, CG
+Valve LK has flow rate=0; tunnels lead to valves XM, AA
+Valve HA has flow rate=0; tunnels lead to valves WH, KF
+Valve DS has flow rate=16; tunnel leads to valve II
+Valve KD has flow rate=0; tunnels lead to valves KG, QB
+Valve JW has flow rate=0; tunnels lead to valves AD, KF
+Valve HU has flow rate=0; tunnels lead to valves UK, CO
+Valve AE has flow rate=10; tunnels lead to valves IR, PT, UV
+Valve XA has flow rate=0; tunnels lead to valves CG, EU
+Valve SE has flow rate=17; tunnels lead to valves YR, AD
+Valve TR has flow rate=0; tunnels lead to valves AL, CS
+Valve BS has flow rate=0; tunnels lead to valves YH, XM
+Valve IJ has flow rate=24; tunnels lead to valves XN, WE
+Valve AA has flow rate=0; tunnels lead to valves LK, AP, IZ, PC, QD
+Valve KG has flow rate=0; tunnels lead to valves KD, CS
+Valve QV has flow rate=0; tunnels lead to valves XM, II
+Valve PC has flow rate=0; tunnels lead to valves AA, YF
+Valve GJ has flow rate=20; tunnel leads to valve RI
+Valve UV has flow rate=0; tunnels lead to valves UK, AE
+Valve IR has flow rate=0; tunnels lead to valves EU, AE
+Valve EU has flow rate=13; tunnels lead to valves IR, DT, XA, ON
+Valve ED has flow rate=0; tunnels lead to valves XN, CO
+Valve DT has flow rate=0; tunnels lead to valves EU, UK
+Valve YE has flow rate=0; tunnels lead to valves XM, WS
+Valve AD has flow rate=0; tunnels lead to valves JW, SE
+Valve WE has flow rate=0; tunnels lead to valves IJ, NA
+Valve UK has flow rate=5; tunnels lead to valves UV, DT, QD, HU
+Valve YR has flow rate=0; tunnels lead to valves OS, SE
+Valve II has flow rate=0; tunnels lead to valves QV, DS
+Valve GT has flow rate=0; tunnels lead to valves CS, MN
+Valve YH has flow rate=0; tunnels lead to valves BS, QB
+Valve BQ has flow rate=0; tunnels lead to valves XM, KF
+Valve OS has flow rate=0; tunnels lead to valves YR, NA
+Valve WH has flow rate=0; tunnels lead to valves QB, HA
+Valve QB has flow rate=4; tunnels lead to valves WH, KD, YH, IZ
+Valve ON has flow rate=0; tunnels lead to valves AP, EU
+Valve IZ has flow rate=0; tunnels lead to valves AA, QB
+Valve MN has flow rate=25; tunnel leads to valve GT
+Valve CG has flow rate=0; tunnels lead to valves XA, QN
+Valve QD has flow rate=0; tunnels lead to valves UK, AA
+Valve AL has flow rate=0; tunnels lead to valves KF, TR
+Valve XN has flow rate=0; tunnels lead to valves ED, IJ
+Valve WS has flow rate=0; tunnels lead to valves YE, CS
+Valve CO has flow rate=18; tunnels lead to valves ED, PT, HU
+Valve PT has flow rate=0; tunnels lead to valves CO, AE
+Valve RI has flow rate=0; tunnels lead to valves QN, GJ
+Valve CS has flow rate=9; tunnels lead to valves YF, GT, WS, TR, KG
+Valve YF has flow rate=0; tunnels lead to valves PC, CS
+Valve NA has flow rate=23; tunnels lead to valves OS, WE
+Valve KF has flow rate=12; tunnels lead to valves HA, AL, JW, BQ
+Valve XM has flow rate=3; tunnels lead to valves LK, QV, YE, BS, BQ

day16/src/main.rs

@@ -0,0 +1,157 @@
+use std::env;
+use std::fs::File;
+use std::io::{BufReader, BufRead};
+use std::collections::{HashMap, HashSet, VecDeque};
+use std::cmp::max;
+use std::str::FromStr;
+use std::fmt::Debug;
+use std::hash::{Hash, Hasher};
+
+const TIME: u64 = 26;
+
+fn parse_str<T: FromStr>(str: &str) -> Result<(T, usize), <T as FromStr>::Err> {
+    let mut iter = str.chars().peekable();
+    let mut prefix = String::new();
+
+    while let Some(c) = iter.peek()  {
+        if !c.to_string().parse::<T>().is_ok() {
+            break;
+        }
+        prefix.push(iter.next().unwrap());
+    }
+    Ok((prefix.parse::<T>()?, prefix.len()))
+}
+
+#[derive(Debug)]
+struct Valve {
+    rate: u64,
+    links: Vec<(String, u64)>,
+}
+
+fn read_input(fname: &String) -> Result<HashMap<String, Valve>, <u64 as FromStr>::Err> {
+    let file = File::open(fname).expect("cannot open input file");
+    let lines = BufReader::new(file).lines();
+    let mut valves = HashMap::new();
+    for line in lines.flatten() {
+        let name = String::from(&line[6..=7]);
+        let (rate, rate_len) = parse_str::<u64>(&line[23..])?;
+        let links_str = &line[23 + rate_len + 24..];
+        let mut link = String::new();
+        let mut links = Vec::new();
+        let mut iter = links_str.chars();
+        loop {
+            match iter.next() {
+                Some(' ') | Some(',') => continue,
+                None => break,
+                Some(c) => { 
+                    link.push(c);
+                    link.push(iter.next().unwrap());
+                    links.push((link.clone(), 1));
+                    link = String::new();
+                },
+            }
+        }
+        valves.insert(name, Valve { rate, links });
+    }
+    Ok(valves)
+}
+
+fn routes_from(valve: &String, valves: &HashMap<String, Valve>) -> Valve {
+    let mut visited = HashSet::from([valve.clone()]);
+    let mut queue = VecDeque::from([(valve.clone(), 0)]);
+    let mut links = Vec::new();
+    while !queue.is_empty() {
+        let (current_valve, current_cost) = queue.pop_front().unwrap();
+        if current_valve != *valve && valves[&current_valve].rate > 0 {
+            // +1 because it takes 1min to open a valve
+            links.push((current_valve.clone(), current_cost + 1));
+        }
+        for (next_valve, _) in &valves[&current_valve].links {
+            if !visited.contains(next_valve) {
+                queue.push_back((next_valve.clone(), current_cost + 1));
+                visited.insert(next_valve.clone());
+            }
+        }
+    }
+    Valve { rate: valves[valve].rate, links: links }
+}
+
+fn print_map<T1: Debug, T2: Debug>(map: &HashMap<T1, T2>) {
+    for (k, v) in map {
+        println!("{:?}: {:?}", k, v);
+    }
+    println!("");
+}
+
+#[derive(Debug, Eq, PartialEq, Clone)]
+struct Visited {
+    set: HashSet<String>,
+}
+
+impl Hash for Visited {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        let l = &mut self.set.iter()
+            .filter(|x| *x != "AA")
+            .cloned().collect::<Vec<String>>();
+        l.sort();
+        l.join("");
+        l.hash(state);
+    }
+}
+
+fn get_pressure_map(valves: &HashMap<String, Valve>) -> HashMap<Visited, u64> {
+    let mut max_pressure: HashMap<Visited, u64> = HashMap::new();
+    let mut queue: VecDeque<(String, u64, u64, Visited)> =
+        VecDeque::from([(
+            String::from("AA"), 0, 0,
+            Visited { set: HashSet::new() },
+        )]);
+    while !queue.is_empty() {
+        let (valve, cost, pressure, visited) = queue.pop_front().unwrap();
+        // println!("{}: {}, {}, {:?}", valve, cost, pressure, visited);
+        if let Some(last_max) = max_pressure.get_mut(&visited) {
+            *last_max = max(*last_max, pressure);
+        } else {
+            max_pressure.insert(visited.clone(), pressure);
+        }
+
+        for (hop, hop_cost) in &valves[&valve].links {
+            let new_cost = cost + hop_cost;
+            if new_cost >= TIME || visited.set.contains(hop) {
+                continue;
+            }
+            let new_pressure = pressure + (TIME - new_cost)*valves[hop].rate;
+            let mut new_visited = visited.clone();
+            new_visited.set.insert(hop.clone());
+            queue.push_back((hop.clone(), new_cost, new_pressure, new_visited));
+        }
+    }
+    max_pressure
+}
+
+fn main() {
+    let input_fname = env::args().nth(1).expect("need input file");
+    let valves = read_input(&input_fname).expect("parse error");
+    let mut good_valves: HashMap<String, Valve> = HashMap::new();
+    for (name, valve) in &valves {
+        if valve.rate > 0 || name == "AA" {
+            good_valves.insert(name.clone(), routes_from(name, &valves));
+        }
+    }
+    print_map(&good_valves);
+
+    let pressure_map = get_pressure_map(&good_valves);
+    // print_map(&pressure_map);
+    println!("pressure_map.len(): {}", pressure_map.len());
+
+    let mut max_pressure = 0;
+    for (visited1, pressure1) in &pressure_map {
+        for (visited2, pressure2) in &pressure_map {
+            if visited1.set.is_disjoint(&visited2.set) {
+                max_pressure = max(max_pressure, pressure1 + pressure2);
+            }
+        }
+    }
+    println!(">> {} <<", max_pressure);
+}
+

day16/src/main1.rs

@@ -0,0 +1,103 @@
+use std::env;
+use std::fs::File;
+use std::io::{BufReader, BufRead};
+use std::collections::{HashMap, HashSet, VecDeque};
+use std::cmp::max;
+use std::str::FromStr;
+
+fn parse_str<T: FromStr>(str: &str) -> Result<(T, usize), <T as FromStr>::Err> {
+    let mut iter = str.chars().peekable();
+    let mut prefix = String::new();
+
+    while let Some(c) = iter.peek()  {
+        if !c.to_string().parse::<T>().is_ok() {
+            break;
+        }
+        prefix.push(iter.next().unwrap());
+    }
+    Ok((prefix.parse::<T>()?, prefix.len()))
+}
+
+#[derive(Debug)]
+struct Valve {
+    rate: u64,
+    links: Vec<(String, u64)>,
+}
+
+fn read_input(fname: &String) -> Result<HashMap<String, Valve>, <u64 as FromStr>::Err> {
+    let file = File::open(fname).expect("cannot open input file");
+    let lines = BufReader::new(file).lines();
+    let mut valves = HashMap::new();
+    for line in lines.flatten() {
+        let name = String::from(&line[6..=7]);
+        let (rate, rate_len) = parse_str::<u64>(&line[23..])?;
+        let links_str = &line[23 + rate_len + 24..];
+        let mut link = String::new();
+        let mut links = Vec::new();
+        let mut iter = links_str.chars();
+        loop {
+            match iter.next() {
+                Some(' ') | Some(',') => continue,
+                None => break,
+                Some(c) => { 
+                    link.push(c);
+                    link.push(iter.next().unwrap());
+                    links.push((link.clone(), 1));
+                    link = String::new();
+                },
+            }
+        }
+        valves.insert(name, Valve { rate, links });
+    }
+    Ok(valves)
+}
+
+fn routes_from(valve: &String, valves: &HashMap<String, Valve>) -> Valve {
+    let mut visited = HashSet::from([valve.clone()]);
+    let mut queue = VecDeque::from([(valve.clone(), 0)]);
+    let mut links = Vec::new();
+    while !queue.is_empty() {
+        let (current_valve, current_cost) = queue.pop_front().unwrap();
+        if current_valve != *valve && valves[&current_valve].rate > 0 {
+            // +1 because it takes 1min to open a valve
+            links.push((current_valve.clone(), current_cost + 1));
+        }
+        for (next_valve, _) in &valves[&current_valve].links {
+            if !visited.contains(next_valve) {
+                queue.push_back((next_valve.clone(), current_cost + 1));
+                visited.insert(next_valve.clone());
+            }
+        }
+    }
+    Valve { rate: valves[valve].rate, links: links }
+}
+
+fn main() {
+    let input_fname = env::args().nth(1).expect("need input file");
+    let valves = read_input(&input_fname).expect("parse error");
+    let mut good_valves = HashMap::new();
+    for (valve_name, valve) in &valves {
+        if valve.rate > 0 || valve_name == "AA" {
+            good_valves.insert(valve_name, routes_from(valve_name, &valves));
+        }
+    }
+
+    let mut max_pressure = 0;
+    let mut queue: VecDeque<(String, u64, u64, HashSet<_>)> = VecDeque::from([(
+        String::from("AA"), 0, 0, HashSet::from([String::from("AA")]))]);
+    while !queue.is_empty() {
+        let (valve, cost, pressure, visited) = queue.pop_front().unwrap();
+        max_pressure = max(max_pressure, pressure);
+        for (hop, hop_cost) in &good_valves[&valve].links {
+            if cost + hop_cost >= 30 || visited.contains(hop) {
+                continue;
+            }
+            let new_cost = cost + hop_cost;
+            let new_pressure = pressure + (30 - new_cost)*valves[hop].rate;
+            let mut new_visited = visited.clone();
+            new_visited.insert(hop.clone());
+            queue.push_back((hop.clone(), new_cost, new_pressure, new_visited));
+        }
+    }
+    println!("Max pressure: {}", max_pressure);
+}

day16/test.txt

@@ -0,0 +1,10 @@
+Valve AA has flow rate=0; tunnels lead to valves DD, II, BB
+Valve BB has flow rate=13; tunnels lead to valves CC, AA
+Valve CC has flow rate=2; tunnels lead to valves DD, BB
+Valve DD has flow rate=20; tunnels lead to valves CC, AA, EE
+Valve EE has flow rate=3; tunnels lead to valves FF, DD
+Valve FF has flow rate=0; tunnels lead to valves EE, GG
+Valve GG has flow rate=0; tunnels lead to valves FF, HH
+Valve HH has flow rate=22; tunnel leads to valve GG
+Valve II has flow rate=0; tunnels lead to valves AA, JJ
+Valve JJ has flow rate=21; tunnel leads to valve II

day17/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day17"
+version = "0.1.0"

day17/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "day17"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]