Add day19

day19/Cargo.lock

@@ -0,0 +1,119 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "ahash"
+version = "0.8.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e89da841a80418a9b391ebaea17f5c112ffaaa96f621d2c285b5174da76b9011"
+dependencies = [
+ "cfg-if",
+ "getrandom",
+ "once_cell",
+ "version_check",
+ "zerocopy",
+]
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
+[[package]]
+name = "day19"
+version = "0.1.0"
+dependencies = [
+ "ahash",
+]
+
+[[package]]
+name = "getrandom"
+version = "0.2.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c4567c8db10ae91089c99af84c68c38da3ec2f087c3f82960bcdbf3656b6f4d7"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
+]
+
+[[package]]
+name = "libc"
+version = "0.2.169"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b5aba8db14291edd000dfcc4d620c7ebfb122c613afb886ca8803fa4e128a20a"
+
+[[package]]
+name = "once_cell"
+version = "1.20.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1261fe7e33c73b354eab43b1273a57c8f967d0391e80353e51f764ac02cf6775"
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.92"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "37d3544b3f2748c54e147655edb5025752e2303145b5aefb3c3ea2c78b973bb0"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.37"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b5b9d34b8991d19d98081b46eacdd8eb58c6f2b201139f7c5f643cc155a633af"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "syn"
+version = "2.0.90"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "919d3b74a5dd0ccd15aeb8f93e7006bd9e14c295087c9896a110f490752bcf31"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "adb9e6ca4f869e1180728b7950e35922a7fc6397f7b641499e8f3ef06e50dc83"
+
+[[package]]
+name = "version_check"
+version = "0.9.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b928f33d975fc6ad9f86c8f283853ad26bdd5b10b7f1542aa2fa15e2289105a"
+
+[[package]]
+name = "wasi"
+version = "0.11.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
+
+[[package]]
+name = "zerocopy"
+version = "0.7.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1b9b4fd18abc82b8136838da5d50bae7bdea537c574d8dc1a34ed098d6c166f0"
+dependencies = [
+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
+version = "0.7.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fa4f8080344d4671fb4e831a13ad1e68092748387dfc4f55e356242fae12ce3e"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]

day19/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "day19"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+ahash = "0.8.11"

day19/src/main.rs

@@ -0,0 +1,99 @@
+#[derive(Debug, Clone, Hash, PartialEq, Eq)]
+enum Color {
+    White,
+    Blue,
+    Black,
+    Red,
+    Green,
+}
+use ahash::AHashMap;
+use Color::*;
+
+impl From<char> for Color {
+    fn from(value: char) -> Self {
+        match value {
+            'w' => White,
+            'u' => Blue,
+            'b' => Black,
+            'r' => Red,
+            'g' => Green,
+            _ => panic!(),
+        }
+    }
+}
+
+#[derive(Debug, Clone, Hash, PartialEq, Eq)]
+struct ParsedInput {
+    available_patterns: Vec<Vec<Color>>,
+    designs: Vec<Vec<Color>>,
+}
+
+fn parse(input: &str) -> ParsedInput {
+    let (patterns, designs) = input.split_once("\n\n").unwrap();
+    ParsedInput {
+        available_patterns: patterns
+            .trim_end()
+            .split(", ")
+            .map(|p| p.chars().map(|c| c.into()).collect())
+            .collect(),
+        designs: designs
+            .lines()
+            .map(|d| d.chars().map(|c| c.into()).collect())
+            .collect(),
+    }
+}
+
+fn count_possible(
+    design: &[Color],
+    available_patterns: &[Vec<Color>],
+    cache: &mut AHashMap<Vec<Color>, usize>,
+) -> usize {
+    if design.is_empty() {
+        return 1;
+    }
+    if let Some(res) = cache.get(design) {
+        return *res;
+    }
+    let mut count = 0;
+    for pattern in available_patterns {
+        if pattern.len() > design.len() {
+            continue;
+        }
+        let mut matches = true;
+        for i in 0..pattern.len() {
+            if design[i] != pattern[i] {
+                matches = false;
+                break;
+            }
+        }
+        if matches {
+            count += count_possible(&design[pattern.len()..], available_patterns, cache);
+        }
+    }
+    cache.insert(design.to_vec(), count);
+    count
+}
+
+fn part1(parsed_input: &ParsedInput) -> usize {
+    let mut cache = AHashMap::new();
+    parsed_input
+        .designs
+        .iter()
+        .filter(|d| count_possible(d, &parsed_input.available_patterns, &mut cache) > 0)
+        .count()
+}
+
+fn part2(parsed_input: &ParsedInput) -> usize {
+    let mut cache = AHashMap::new();
+    parsed_input
+        .designs
+        .iter()
+        .map(|d| count_possible(d, &parsed_input.available_patterns, &mut cache))
+        .sum()
+}
+
+fn main() {
+    let input = parse(include_str!("../input.txt"));
+    println!("{}", part1(&input));
+    println!("{}", part2(&input));
+}