Add day12
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126
day12/Cargo.lock
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126
day12/Cargo.lock
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# This file is automatically @generated by Cargo.
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# It is not intended for manual editing.
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version = 4
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[[package]]
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name = "ahash"
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version = "0.8.11"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "e89da841a80418a9b391ebaea17f5c112ffaaa96f621d2c285b5174da76b9011"
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dependencies = [
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"cfg-if",
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"getrandom",
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"once_cell",
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"version_check",
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"zerocopy",
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]
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[[package]]
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name = "cfg-if"
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version = "1.0.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
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[[package]]
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name = "day12"
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version = "0.1.0"
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dependencies = [
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"ahash",
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"glam",
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]
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[[package]]
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name = "getrandom"
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version = "0.2.15"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "c4567c8db10ae91089c99af84c68c38da3ec2f087c3f82960bcdbf3656b6f4d7"
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dependencies = [
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"cfg-if",
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"libc",
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"wasi",
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]
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[[package]]
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name = "glam"
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version = "0.29.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "dc46dd3ec48fdd8e693a98d2b8bafae273a2d54c1de02a2a7e3d57d501f39677"
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[[package]]
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name = "libc"
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version = "0.2.168"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "5aaeb2981e0606ca11d79718f8bb01164f1d6ed75080182d3abf017e6d244b6d"
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[[package]]
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name = "once_cell"
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version = "1.20.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "1261fe7e33c73b354eab43b1273a57c8f967d0391e80353e51f764ac02cf6775"
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[[package]]
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name = "proc-macro2"
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version = "1.0.92"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "37d3544b3f2748c54e147655edb5025752e2303145b5aefb3c3ea2c78b973bb0"
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dependencies = [
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"unicode-ident",
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]
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[[package]]
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name = "quote"
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version = "1.0.37"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "b5b9d34b8991d19d98081b46eacdd8eb58c6f2b201139f7c5f643cc155a633af"
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dependencies = [
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"proc-macro2",
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]
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[[package]]
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name = "syn"
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version = "2.0.90"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "919d3b74a5dd0ccd15aeb8f93e7006bd9e14c295087c9896a110f490752bcf31"
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dependencies = [
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"proc-macro2",
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"quote",
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"unicode-ident",
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]
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[[package]]
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name = "unicode-ident"
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version = "1.0.14"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "adb9e6ca4f869e1180728b7950e35922a7fc6397f7b641499e8f3ef06e50dc83"
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[[package]]
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name = "version_check"
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version = "0.9.5"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "0b928f33d975fc6ad9f86c8f283853ad26bdd5b10b7f1542aa2fa15e2289105a"
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[[package]]
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name = "wasi"
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version = "0.11.0+wasi-snapshot-preview1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
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[[package]]
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name = "zerocopy"
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version = "0.7.35"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "1b9b4fd18abc82b8136838da5d50bae7bdea537c574d8dc1a34ed098d6c166f0"
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dependencies = [
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"zerocopy-derive",
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]
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[[package]]
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name = "zerocopy-derive"
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version = "0.7.35"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "fa4f8080344d4671fb4e831a13ad1e68092748387dfc4f55e356242fae12ce3e"
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dependencies = [
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"proc-macro2",
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"quote",
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"syn",
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]
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8
day12/Cargo.toml
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8
day12/Cargo.toml
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[package]
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name = "day12"
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version = "0.1.0"
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edition = "2021"
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[dependencies]
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ahash = "0.8.11"
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glam = "0.29.2"
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122
day12/src/main.rs
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122
day12/src/main.rs
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use ahash::AHashSet;
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use glam::IVec2;
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fn parse(input: &str) -> Vec<Vec<char>> {
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input.lines().map(|l| l.chars().collect()).collect()
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}
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const DIRECTIONS: [IVec2; 4] = [
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IVec2 { x: -1, y: 0 },
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IVec2 { x: 1, y: 0 },
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IVec2 { x: 0, y: -1 },
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IVec2 { x: 0, y: 1 },
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];
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fn get_region(pos: &IVec2, map: &[Vec<char>]) -> AHashSet<IVec2> {
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let mut res = AHashSet::new();
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let mut prev_amount = 0;
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let plot_type = map[pos.x as usize][pos.y as usize];
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res.insert(*pos);
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while res.len() != prev_amount {
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let mut new_plots = AHashSet::new();
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for plot in &res {
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for direction in DIRECTIONS {
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let new_pos = plot + direction;
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if let Some(Some(new_plot)) = map
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.get(new_pos.x as usize)
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.map(|v| v.get(new_pos.y as usize))
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{
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if new_plot == &plot_type {
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new_plots.insert(new_pos);
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}
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}
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}
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}
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prev_amount = res.len();
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res.extend(new_plots);
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}
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res
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}
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fn get_perimeter(region: &AHashSet<IVec2>) -> usize {
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let mut res = 0;
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for pos in region {
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for direction in DIRECTIONS {
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if !region.contains(&(pos + direction)) {
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res += 1;
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}
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}
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}
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res
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}
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fn get_connected(pos: &IVec2, all_pos: &AHashSet<IVec2>) -> AHashSet<IVec2> {
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let mut res = AHashSet::new();
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res.insert(*pos);
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let mut last_len = 0;
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while last_len != res.len() {
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let mut new_positions = AHashSet::new();
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for checking in &res {
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for direction in DIRECTIONS {
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if all_pos.contains(&(checking + direction)) {
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new_positions.insert(checking + direction);
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}
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}
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}
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last_len = res.len();
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res.extend(new_positions);
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}
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res
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}
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fn get_sides(region: &AHashSet<IVec2>) -> usize {
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let mut res = 0;
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for direction in DIRECTIONS {
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let mut outside = AHashSet::new();
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for plot in region {
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if !region.contains(&(plot + direction)) {
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outside.insert(plot + direction);
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}
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}
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while !outside.is_empty() {
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let connected = get_connected(outside.iter().next().unwrap(), &outside);
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res += 1;
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outside.retain(|p| !connected.contains(p));
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}
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}
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res
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}
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fn part12(map: &[Vec<char>], part2: bool) -> usize {
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let mut positions: AHashSet<IVec2> = (0..map.len())
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.flat_map(|x| {
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(0..map[0].len()).map(move |y| IVec2 {
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x: x as i32,
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y: y as i32,
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})
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})
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.collect();
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let mut regions = vec![];
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while !positions.is_empty() {
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let region = get_region(positions.iter().next().unwrap(), map);
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positions.retain(|p| !region.contains(p));
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regions.push(region);
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}
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regions
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.iter()
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.map(|r| {
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r.len()
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* if part2 {
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get_sides(r)
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} else {
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get_perimeter(r)
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}
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})
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.sum()
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}
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fn main() {
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let input = parse(include_str!("../input.txt"));
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println!("{}", part12(&input, false));
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println!("{}", part12(&input, true));
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}
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