diff --git a/2023/input/05/input b/2023/input/05/input new file mode 100644 index 0000000..8e9d0ba --- /dev/null +++ b/2023/input/05/input @@ -0,0 +1,207 @@ +seeds: 104847962 3583832 1212568077 114894281 3890048781 333451605 1520059863 217361990 310308287 12785610 3492562455 292968049 1901414562 516150861 2474299950 152867148 3394639029 59690410 862612782 176128197 + +seed-to-soil map: +2023441036 2044296880 396074363 +2419515399 3839972576 454994720 +274688417 699823315 258919718 +533608135 0 431744151 +965352286 431744151 161125324 +3391658630 2936663910 903308666 +200749950 1177785526 73938467 +2874510119 1440389999 315892137 +1916089471 2440371243 20593195 +0 977035576 200749950 +1936682666 1957538510 86758370 +1440389999 2902130623 34533287 +1126477610 592869475 106953840 +3190402256 1756282136 201256374 +1474923286 2460964438 441166185 +1233431450 958743033 18292543 + +soil-to-fertilizer map: +1479837493 1486696129 480988794 +3637384566 3730606485 267472485 +70483107 174821741 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+light-to-temperature map: +45 77 23 +81 45 19 +68 64 13 + +temperature-to-humidity map: +0 69 1 +1 0 69 + +humidity-to-location map: +60 56 37 +56 93 4 diff --git a/2023/src/bin/day05.rs b/2023/src/bin/day05.rs new file mode 100644 index 0000000..68aec93 --- /dev/null +++ b/2023/src/bin/day05.rs @@ -0,0 +1,223 @@ +#![feature(iter_map_windows)] +#![feature(test)] +use std::{ + cmp::max, + collections::VecDeque, + ops::{Add, BitAnd, BitOr}, +}; + +use anyhow::Result; +use aoc::Solver; + +// -- Runners -- +fn main() -> Result<()> { + Day::solve() +} + +#[cfg(test)] +mod tests { + use super::*; + + #[test] + fn part1_test1() -> Result<()> { + Day::test(Day::part1, "test-1", 35) + } + + #[test] + fn part1_solution() -> Result<()> { + Day::test(Day::part1, "input", 88151870) + } + + #[test] + fn part1_test2() -> Result<()> { + Day::test(Day::part2, "test-1", 46) + } + + #[test] + fn part2_solution() -> Result<()> { + Day::test(Day::part2, "input", 2008785) + } + + // Benchmarks + extern crate test; + #[bench] + #[ignore] + fn part1_bench(b: &mut test::Bencher) { + Day::benchmark(Day::part1, b) + } + #[bench] + #[ignore] + fn part2_bench(b: &mut test::Bencher) { + Day::benchmark(Day::part2, b) + } +} + +#[derive(Debug, Clone, Copy)] +struct Range { + start: isize, + length: isize, +} + +impl Range { + pub fn new(start: isize, length: isize) -> Self { + Self { start, length } + } + + pub fn end(&self) -> isize { + self.start + self.length + } + + pub fn offset(&self, offset: isize) -> Self { + Self { + start: self.start + offset, + length: self.length, + } + } + + pub fn overlap(&self, rhs: &Self) -> Option { + let start = max(self.start, rhs.start); + let end = std::cmp::min(self.end(), rhs.end()); + + if end > start { + Some(Range { + start, + length: end - start, + }) + } else { + None + } + } + + pub fn exclude(&self, rhs: &Self) -> VecDeque { + if let Some(overlap) = self.overlap(rhs) { + if rhs.start <= self.start && rhs.end() >= self.end() { + vec![].into() + } else if rhs.start <= self.start { + let start = rhs.end(); + let length = self.end() - start; + + vec![Range::new(start, length)].into() + } else if rhs.end() >= self.end() { + let start = self.start; + let length = rhs.start - start; + + vec![Range::new(start, length)].into() + } else { + let a = Range::new(self.start, overlap.start - self.start); + let b = Range::new(overlap.end(), self.end() - overlap.end()); + + vec![a, b].into() + } + } else { + vec![*self].into() + } + } +} + +// -- Solution -- +pub struct Day; +impl aoc::Solver for Day { + type Output1 = isize; + type Output2 = isize; + + fn day() -> u8 { + 5 + } + + fn part1(input: &str) -> Self::Output1 { + let mut split = input.split("\n\n"); + let mut seeds: Vec<_> = split + .next() + .unwrap() + .split_once(": ") + .unwrap() + .1 + .split_whitespace() + .map(|seed| seed.parse::().unwrap()) + .collect(); + + for _ in 0..7 { + let map = split + .next() + .unwrap() + .lines() + .skip(1) + .map(|line| { + let mut split = line.splitn(3, ' '); + ( + split.next().unwrap().parse::().unwrap(), + split.next().unwrap().parse::().unwrap(), + split.next().unwrap().parse::().unwrap(), + ) + }) + .collect::>(); + + seeds = seeds + .into_iter() + .map(|mut seed| { + for mapping in map.iter() { + if seed >= mapping.1 && seed < (mapping.1 + mapping.2) { + seed = seed - mapping.1 + mapping.0; + break; + } + } + + seed + }) + .collect(); + } + + *seeds.iter().min().unwrap() + } + + fn part2(input: &str) -> Self::Output2 { + let mut split = input.split("\n\n"); + let mut seeds: VecDeque<_> = split + .next() + .unwrap() + .split_once(": ") + .unwrap() + .1 + .split_whitespace() + .map(|seed| seed.parse::().unwrap()) + .map_windows(|range: &[isize; 2]| Range::new(range[0], range[1])) + .step_by(2) + .collect(); + + for _ in 0..7 { + let map = split + .next() + .unwrap() + .lines() + .skip(1) + .map(|line| { + let mut split = line.splitn(3, ' '); + let remap = split.next().unwrap().parse::().unwrap(); + let start = split.next().unwrap().parse::().unwrap(); + let length = split.next().unwrap().parse::().unwrap(); + + (Range::new(start, length), remap - start) + }) + .collect::>(); + + let mut result = VecDeque::new(); + + 'outer: while let Some(seed) = seeds.pop_front() { + for mapping in map.iter() { + if let Some(overlap) = seed.overlap(&mapping.0) { + result.push_back(overlap.offset(mapping.1)); + seeds.append(&mut seed.exclude(&mapping.0)); + + continue 'outer; + } + } + + result.push_back(seed); + } + + seeds = result; + } + + seeds.iter().map(|range| range.start).min().unwrap() + } +}