day 5

day5/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"

day5/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]

day5/input.txt

@@ -0,0 +1,239 @@
+seeds: 929142010 467769747 2497466808 210166838 3768123711 33216796 1609270159 86969850 199555506 378609832 1840685500 314009711 1740069852 36868255 2161129344 170490105 2869967743 265455365 3984276455 31190888
+
+seed-to-soil map:
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+
+soil-to-fertilizer map:
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+
+fertilizer-to-water map:
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+
+water-to-light map:
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+
+light-to-temperature map:
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+
+temperature-to-humidity map:
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+
+humidity-to-location map:
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day5/src/main.rs

@@ -0,0 +1,116 @@
+use std::fs::read_to_string;
+use std::cmp;
+use std::time::Instant;
+
+fn get_numbers_in_line(str: &str) -> Vec<u32> {
+    return str.split_whitespace().filter_map(|substr| substr.parse::<u32>().ok()).collect();
+}
+
+fn process(seeds: Vec<u32>, mut maps: Vec<Vec<(u32, u32, u32)>>) -> (u32, u32) {
+    for map in maps.iter_mut() {
+        map.sort_unstable_by(|&(a, _, _), &(b, _, _)| a.partial_cmp(&b).unwrap());
+    }
+    // Task 1 - mapping a single number through all mappings
+    let min1 = seeds.iter().map(
+        |seed| {
+            let mut n = *seed;
+            for map in &maps {
+                for &(src, dst, len) in map {
+                    if src > n {
+                        break;
+                    }
+                    if n - src < len {
+                        n = n - src + dst;
+                        break;
+                    }
+                }
+            }
+            n
+        }
+    ).min().unwrap();
+
+    // Task 2 - mapping whole ranges through all mappings
+    // Array of ranges that will be mapped for task 2 initialized with pairs from seeds
+    let mut processed_ranges: Vec<_> = (0..seeds.len()).step_by(2).map(|i| (seeds[i], seeds[i + 1])).collect();
+    let mut swap_ranges: Vec<(u32, u32)> = Vec::new();
+    // Map the processed_ranged through all mappings
+    for map in &maps {
+        swap_ranges.clear();
+        for &(working_start, working_len) in &processed_ranges {
+            // Applying one or more mapping ranges to the processed range
+            let (mut temp_start, mut temp_len) = (working_start, working_len);
+            for &(src, dst, len) in map {
+                // Working range starts before mapping range, means it's an unmapped segment
+                if temp_start < src {
+                    let out_len = cmp::min(temp_len, src - temp_start);
+                    swap_ranges.push((temp_start, out_len));
+                    if out_len == temp_len {
+                        break;
+                    }
+                    temp_start = src;
+                }
+                // Working range is sure to not begin before mapping range
+                let start_diff = temp_start - src;
+                // Mapping range is so short that it doesn't reach the working range, skip
+                if len <= start_diff {
+                    continue;
+                }
+                let out_len = cmp::min(temp_len, len - start_diff);
+                swap_ranges.push((dst + start_diff, out_len));
+                if out_len == temp_len {
+                    break;
+                }
+                // Consume the beginning of the working range
+                temp_start += out_len;
+                temp_len -= out_len;
+            }
+        }
+        std::mem::swap(&mut processed_ranges, &mut swap_ranges);
+    }
+    // Find the range with lowest starting value, length is guaranteed to be nonzero
+    let min2 = processed_ranges.iter().map(|&(start, _)| start).min().unwrap();
+    (min1, min2)
+}
+
+fn main() {
+    let time_start = Instant::now();
+    // Set of inputs
+    let mut seeds: Vec<u32> = Vec::new();
+    // Mappings of ranges, ordered in order to easily find the lowest relevant range
+    // Order: (src, dst, len)
+    let mut maps: Vec<Vec<(u32, u32, u32)>> = Vec::new();
+    maps.push(Vec::new());
+    let mut did_read_seeds: bool = false;
+    for line in read_to_string("input.txt").unwrap().lines() {
+        if !did_read_seeds {
+            seeds = get_numbers_in_line(line);
+            did_read_seeds = true;
+        } else {
+            let numbers = get_numbers_in_line(line);
+            if numbers.len() == 3 {
+                maps.last_mut().unwrap().push((numbers[1],numbers[0], numbers[2]));
+            } else {
+                if !maps.last().unwrap().is_empty() {
+                    maps.push(Vec::new());
+                }
+            }
+        }
+    }
+    if maps.last().unwrap().is_empty() {
+        maps.pop();
+    }
+    let time_start_no_io = Instant::now();
+
+    // for _ in 0..1000 {
+    //    let (_, _) = process(seeds.clone(), maps.clone());
+    // }
+    let (min1, min2) = process(seeds, maps);
+
+    // Measurements
+    let elapsed = time_start.elapsed().as_nanos();
+    let elapsed_no_io = time_start_no_io.elapsed().as_nanos();
+    println!("Time: {}ns", elapsed);
+    println!("Time without file i/o: {}ns", elapsed_no_io);
+    println!("Min location1: {}", min1);
+    println!("Min location2: {}", min2);
+}