From 77a2c79f410f5040a2533a5a52d7de4480d85957 Mon Sep 17 00:00:00 2001 From: pjht Date: Wed, 6 Dec 2023 07:57:39 -0600 Subject: [PATCH] Day 5 initial solution (part 2 too slow, untested) --- input/2023/day5.txt | 213 ++++++++++++++++++++++++++++++++++++++++++++ src/day05.rs | 129 +++++++++++++++++++++++++++ src/lib.rs | 1 + 3 files changed, 343 insertions(+) create mode 100644 input/2023/day5.txt create mode 100644 src/day05.rs diff --git a/input/2023/day5.txt b/input/2023/day5.txt new file mode 100644 index 0000000..eeee701 --- /dev/null +++ b/input/2023/day5.txt @@ -0,0 +1,213 @@ +seeds: 3139431799 50198205 3647185634 110151761 2478641666 139825503 498892555 8913570 961540761 489996751 568452082 100080382 907727477 42158689 1617552130 312026427 342640189 97088268 2049289560 336766062 + +seed-to-soil map: +1615836342 1401909974 23067952 +785532007 269485885 88937774 +3019002892 2773729385 10470414 +4202163101 2747292152 26437233 +3183210415 4217634159 77333137 +2847460091 3211730218 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+1957894300 561533 922927950 +945220828 2590144784 734802140 +2880822250 0 561533 +3447014853 1489120553 277858250 +2881383783 923489483 565631070 +3965094386 3724873103 140154003 +1680022968 2312273452 277871332 diff --git a/src/day05.rs b/src/day05.rs new file mode 100644 index 0000000..6f06666 --- /dev/null +++ b/src/day05.rs @@ -0,0 +1,129 @@ +use std::ops::Range; + +use aoc_runner_derive::{aoc, aoc_generator}; +use nom::{ + bytes::complete::tag, + character::complete::{anychar, line_ending}, + combinator::map, + multi::{many_till, separated_list0}, + sequence::{pair, preceded, separated_pair, terminated, tuple}, + IResult, +}; + +#[derive(Debug)] +struct Map { + ranges: Vec<(Range, i32)>, +} + +impl Map { + fn new(raw_ranges: Vec<(u32, u32, u32)>) -> Self { + let mut ranges = Vec::new(); + for (dest_start, source_start, len) in raw_ranges { + let source_range = source_start..(source_start + len); + let offset = ((dest_start as i64) - (source_start as i64)) as i32; + ranges.push((source_range, offset)) + } + Self { ranges } + } + + fn transform(&self, input: u32) -> u32 { + for (range, offset) in &self.ranges { + if range.contains(&input) { + return ((input as i64) + (*offset as i64)) as u32; + } + } + input + } + + fn transform_range(&self, input: Range) -> Range { + let start = self.transform(input.start); + let end = self.transform(input.end); + start..end + } +} + +fn parse_seed_list(input: &str) -> IResult<&str, Vec> { + preceded( + tag("seeds: "), + separated_list0(tag(" "), nom::character::complete::u32), + )(input) +} + +fn parse_seed_list_as_ranges(input: &str) -> IResult<&str, Vec>> { + preceded( + tag("seeds: "), + separated_list0( + tag(" "), + map( + separated_pair( + nom::character::complete::u32, + tag(" "), + nom::character::complete::u32, + ), + |(start, length)| (start..(start + length)), + ), + ), + )(input) +} + +fn parse_raw_range(input: &str) -> IResult<&str, (u32, u32, u32)> { + tuple(( + terminated(nom::character::complete::u32, tag(" ")), + terminated(nom::character::complete::u32, tag(" ")), + nom::character::complete::u32, + ))(input) +} + +fn parse_map(input: &str) -> IResult<&str, Map> { + map( + preceded( + many_till(anychar, line_ending), + separated_list0(line_ending, parse_raw_range), + ), + Map::new, + )(input) +} + +#[aoc_generator(day5, part1)] +fn input_generator_part1(input: &str) -> (Vec, Vec) { + pair( + terminated(parse_seed_list, pair(line_ending, line_ending)), + separated_list0(pair(line_ending, line_ending), parse_map), + )(input) + .unwrap() + .1 +} + +#[aoc_generator(day5, part2)] +fn input_generator_part2(input: &str) -> (Vec>, Vec) { + pair( + terminated(parse_seed_list_as_ranges, pair(line_ending, line_ending)), + separated_list0(pair(line_ending, line_ending), parse_map), + )(input) + .unwrap() + .1 +} + +#[aoc(day5, part1)] +fn part1((seeds, maps): &(Vec, Vec)) -> u32 { + fn run_through_maps(seed: u32, maps: &[Map]) -> u32 { + maps.iter().fold(seed, |val, map| map.transform(val)) + } + seeds + .iter() + .map(|&seed| run_through_maps(seed, &maps)) + .min() + .unwrap() +} + +#[aoc(day5, part2)] +fn part2((seeds, maps): &(Vec>, Vec)) -> u32 { + fn run_through_maps(seed: u32, maps: &[Map]) -> u32 { + maps.iter().fold(seed, |val, map| map.transform(val)) + } + seeds + .iter() + .flat_map(|range| maps.iter().fold(range.clone(), |val, map| map.transform_range(val)).clone()) + .min() + .unwrap() +} diff --git a/src/lib.rs b/src/lib.rs index c0e7712..bad81fe 100644 --- a/src/lib.rs +++ b/src/lib.rs @@ -4,5 +4,6 @@ mod day01; mod day02; mod day03; mod day04; +mod day05; aoc_lib! { year = 2023 }