day 7

2023-12-07 13:59:03 +01:00
1 parent 9dafa9952f
commit 5a03581041
@@ -0,0 +1,16 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day7"
+version = "0.1.0"
+dependencies = [
+ "once_cell",
+]
+
+[[package]]
+name = "once_cell"
+version = "1.19.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3fdb12b2476b595f9358c5161aa467c2438859caa136dec86c26fdd2efe17b92"
@@ -0,0 +1,9 @@
+[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]
+once_cell = "1.19.0"
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@@ -0,0 +1,127 @@
+use once_cell::sync::Lazy;
+use std::fs::read_to_string;
+
+static CARD_STRENGTH: Lazy<[u8; 128]> = Lazy::new(|| core::array::from_fn(
+    |i| {
+        match i as u8 as char {
+            '2'..='9' => i as u8 - '2' as u8,
+            'T' => 8 as u8,
+            'J' => 9 as u8,
+            'Q' => 10 as u8,
+            'K' => 11 as u8,
+            'A' => 12 as u8,
+            _ => 0 as u8
+        }
+    }));
+
+static CARD_STRENGTH_ALT: Lazy<[u8; 128]> = Lazy::new(|| core::array::from_fn(
+    |i| {
+        match i as u8 as char {
+            'J' => 0 as u8,
+            '2'..='9' => i as u8 - '1' as u8,
+            'T' => 9 as u8,
+            'Q' => 10 as u8,
+            'K' => 11 as u8,
+            'A' => 12 as u8,
+            _ => 0 as u8
+        }
+    }));
+
+fn get_hand_strength(str: &str) -> i32 {
+    // Amount of combinations is much smaller than i32, so we can just order them all
+    let mut iter = str.bytes().map(|c| CARD_STRENGTH[c as usize]);
+    let hand: [u8; 5] = [iter.next().unwrap(), iter.next().unwrap(), iter.next().unwrap(), iter.next().unwrap(), iter.next().unwrap()];
+    // strength of cards from first to last, constructed like a base13 number, used to break ties
+    let mut cards_strengths: i32 = 0;
+    let mut occurences: [u8; 13] = [0; 13];
+    for c in hand {
+        occurences[c as usize] += 1;
+        cards_strengths *= 13;
+        cards_strengths += c as i32;
+    }
+    let mut occurences_reduced = occurences.iter().cloned().filter(|&c| c > 0 as u8).collect::<Vec<_>>();
+    // sorting the numbers of occurences descending, the biggest group is always the most important
+    occurences_reduced.sort_by(|a, b| b.cmp(a));
+    let mut combination_strength: i32 = match occurences_reduced[0] {
+        5 => 6,
+        4 => 5,
+        3 => 3,
+        2 => 1,
+        _ => 0
+    };
+    if occurences_reduced.len() > 1 && occurences_reduced[1] == 2 {
+        combination_strength += 1;
+    }
+    cards_strengths + combination_strength * 371293 // 13^5, max value of cards_strengths + 1
+}
+
+fn get_hand_strength_alt(str: &str) -> i32 {
+    // Amount of combinations is much smaller than i32, so we can just order them all
+    let mut iter = str.bytes().map(|c| CARD_STRENGTH_ALT[c as usize]);
+    let hand: [u8; 5] = [iter.next().unwrap(), iter.next().unwrap(), iter.next().unwrap(), iter.next().unwrap(), iter.next().unwrap()];
+    // strength of cards from first to last, constructed like a base13 number, used to break ties
+    let mut cards_strengths: i32 = 0;
+    let mut occurences: [u8; 13] = [0; 13];
+    for c in hand {
+        occurences[c as usize] += 1;
+        cards_strengths *= 13;
+        cards_strengths += c as i32;
+    }
+    // taking jokers out of the picture, they will be added after getting the sorted groups
+    let jokers = occurences[0];
+    occurences[0] = 0;
+    let mut occurences_reduced = occurences.iter().cloned().filter(|&c| c > 0 as u8).collect::<Vec<_>>();
+    // sorting the numbers of occurences descending, the biggest group is always the most important
+    occurences_reduced.sort_by(|a, b| b.cmp(a));
+    if occurences_reduced.is_empty() {
+        // if all cards are jokers
+        occurences_reduced.push(jokers);
+    } else {
+        // adding jokers to the biggest group will always get the biggest value increase
+        occurences_reduced[0] += jokers;
+    }
+    let mut combination_strength: i32 = match occurences_reduced[0] {
+        5 => 6,
+        4 => 5,
+        3 => 3,
+        2 => 1,
+        _ => 0
+    };
+    if occurences_reduced.len() > 1 && occurences_reduced[1] == 2 {
+        combination_strength += 1;
+    }
+    cards_strengths + combination_strength * 371293 // 13^5, max value of cards_strengths + 1
+}
+
+fn main() {
+    let hands = read_to_string("input.txt").unwrap().lines().map(
+        |str| {
+            let mut elems = str.split_whitespace();
+            let hand_text = String::from(elems.next().unwrap());
+            let bid = elems.next().unwrap().parse::<i32>().unwrap();
+            (hand_text, bid)
+        }
+    ).collect::<Vec<_>>();
+    let mut hands_task1 = hands.iter().map(
+        |(hand_text, bid)| {
+            (get_hand_strength(hand_text), *bid)
+        }
+    ).collect::<Vec<_>>();
+    hands_task1.sort();
+    let winnings1 = hands_task1.iter().enumerate().fold(
+        0, |acc, (order, &(_, bid))| {
+            acc + (order as i32 + 1) * bid
+        });
+    let mut hands_task2 = hands.iter().map(
+        |(hand_text, bid)| {
+            (get_hand_strength_alt(hand_text), hand_text, *bid)
+        }
+    ).collect::<Vec<_>>();
+    hands_task2.sort();
+    let winnings2 = hands_task2.iter().enumerate().fold(
+        0, |acc, (order, &(_, _, bid))| {
+            acc + (order as i32 + 1) * bid
+        });
+    println!("Winnings1: {}", winnings1);
+    println!("Winnings2: {}", winnings2);
+}