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2023: Day 5, part 1
This commit is contained in:
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5 changed files with 417 additions and 0 deletions
7
2023/day5/Cargo.lock
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7
2023/day5/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 = 3
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[[package]]
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name = "day5"
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version = "0.1.0"
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8
2023/day5/Cargo.toml
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8
2023/day5/Cargo.toml
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[package]
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name = "day5"
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version = "0.1.0"
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edition = "2021"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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119
2023/day5/src/main.rs
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119
2023/day5/src/main.rs
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use std::collections::HashMap;
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use std::ops::Range;
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use std::{env, fs};
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type BoxError = Box<dyn std::error::Error>;
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#[derive(Debug)]
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struct Map {
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source: String,
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dest: String,
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mappings: Vec<MapRange>,
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}
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#[derive(Debug)]
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struct MapRange {
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destination_range_start: usize,
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source_range_start: usize,
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length: usize,
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}
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fn main() -> Result<(), BoxError> {
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let input_path = env::args_os()
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.skip(1)
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.next()
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.ok_or("missing input file path")?;
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let input = fs::read_to_string(input_path)?;
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let mut chunks = input.split("\n\n");
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let seeds_text = chunks.next().ok_or("missing seeds")?;
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if !seeds_text.starts_with("seeds: ") {
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return Err("seeds text does not start with expected prefix".into());
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}
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let seeds = seeds_text
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.split_ascii_whitespace()
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.skip(1)
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.map(|text| text.parse::<usize>())
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.collect::<Result<Vec<_>, _>>()?;
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let mut maps = HashMap::new();
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for map_text in chunks {
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let map = read_map(map_text)?;
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maps.insert(map.source.clone(), map);
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}
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// chase the seed ids through the maps
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let locations = seeds
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.iter()
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.copied()
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.map(|seed| {
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let mut map = &maps["seed"];
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let mut id = seed;
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while map.dest != "location" {
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id = map.lookup(id);
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map = &maps[&map.dest];
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}
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map.lookup(id)
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})
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.collect::<Vec<_>>();
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println!(
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"Part 1: {}",
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locations.iter().min().ok_or("no min location")?
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);
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Ok(())
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}
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fn read_map(input: &str) -> Result<Map, BoxError> {
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let mut lines = input.lines();
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let title = lines.next().ok_or("map missing title")?;
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let (from_to, _) = title.split_once(' ').ok_or("unable to split title")?;
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let mut words = from_to.split('-');
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let source = words.next().ok_or("title missing source")?;
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let _to = words.next();
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let destination = words.next().ok_or("title missing destination")?;
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let mut mappings = Vec::new();
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for line in lines {
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match line
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.split_ascii_whitespace()
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.map(|part| part.parse::<usize>())
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.collect::<Result<Vec<_>, _>>()?
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.as_slice()
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{
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&[destination_range_start, source_range_start, length] => mappings.push(MapRange {
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destination_range_start,
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source_range_start,
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length,
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}),
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_ => return Err(format!("unable to parse '{}'", line).into()),
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}
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}
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Ok(Map {
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source: source.to_owned(),
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dest: destination.to_owned(),
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mappings,
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})
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}
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impl Map {
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fn lookup(&self, id: usize) -> usize {
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self.mappings
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.iter()
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.find_map(|range| range.map(id))
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.unwrap_or(id)
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}
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}
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impl MapRange {
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fn map(&self, id: usize) -> Option<usize> {
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self.source_range().contains(&id).then(|| {
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let offset = id - self.source_range_start;
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self.destination_range_start + offset
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})
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}
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fn source_range(&self) -> Range<usize> {
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self.source_range_start..self.source_range_start + self.length
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}
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}
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33
2023/input/day5.sample
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33
2023/input/day5.sample
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seeds: 79 14 55 13
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seed-to-soil map:
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50 98 2
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52 50 48
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soil-to-fertilizer map:
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0 15 37
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37 52 2
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39 0 15
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fertilizer-to-water map:
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49 53 8
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0 11 42
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42 0 7
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57 7 4
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water-to-light map:
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88 18 7
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18 25 70
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light-to-temperature map:
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45 77 23
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81 45 19
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68 64 13
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temperature-to-humidity map:
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0 69 1
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1 0 69
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humidity-to-location map:
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60 56 37
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56 93 4
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250
2023/input/day5.txt
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250
2023/input/day5.txt
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seeds: 28965817 302170009 1752849261 48290258 804904201 243492043 2150339939 385349830 1267802202 350474859 2566296746 17565716 3543571814 291402104 447111316 279196488 3227221259 47952959 1828835733 9607836
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seed-to-soil map:
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3680121696 1920754815 614845600
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1920754815 3846369604 448597692
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193356576 570761634 505124585
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2369352507 2535600415 31531965
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2400884472 2567132380 1279237224
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0 459278395 111483239
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698481161 97868205 361410190
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1059891351 0 15994868
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111483239 15994868 81873337
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soil-to-fertilizer map:
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1633669237 1273301814 72865265
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2398515176 2671190790 99210785
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2397916384 3018946373 598792
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4034325916 3061716397 20017393
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3298612516 3793795301 14249501
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4030007411 3051046904 2833129
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1906984482 224872691 14620134
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864506893 1590633724 149044542
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1029530319 442871336 36727018
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1921604616 770934113 68546178
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3560536321 3114405501 28822192
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1019762634 1263534129 9767685
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3852235341 3579014714 60339892
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2385228698 1577946038 12687686
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2234322470 239492825 150906228
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0 170310676 54562015
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3208946111 3808044802 89666405
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1209615399 839480291 424053838
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4032840540 4041982568 1485376
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2497725961 2174737461 293042810
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2002543511 1346167079 231778959
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3312862017 3475611771 103402943
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318739997 1739678266 354749094
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1013551435 3012735174 6211199
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4014277153 4160859076 15730258
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3589358513 3143227693 230682158
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1990150794 2467780271 12392717
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3051046904 3081733790 32671711
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3820040671 3761600631 32194670
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148429321 0 170310676
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673489091 2480172988 191017802
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1066257337 627576051 143358062
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2790768771 2770401575 242333599
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3091554979 4043467944 117391132
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3416264960 3897711207 144271361
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3912575233 3373909851 101701920
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4072291714 3639354606 104297620
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3083718615 3053880033 7836364
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54562015 3019545165 13557205
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1759006785 479598354 147977697
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68119220 2094427360 80310101
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1706534502 390399053 52472283
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4054343309 3743652226 17948405
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fertilizer-to-water map:
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0 1095885172 129797665
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2661548513 1044284418 17872363
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3282164642 3678907615 214830258
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1440687421 2218635146 325889720
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3496994900 4208791298 25912548
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3253828209 4136945159 5561683
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1797056017 864689597 109403664
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3259389892 4186016548 22774750
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2578517508 1225682837 83031005
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3193832718 3618912124 59995491
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3695649169 3214450646 211194594
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820325042 974093261 70191157
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1284591017 1074888739 20996433
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2929761569 3893737873 85668135
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1305587450 2605461705 73959171
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2168339930 1062156781 12731958
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2465234843 2135490203 52666067
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3522907448 4108091872 882860
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3523790308 4255675252 39292044
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2517900910 1308713842 60616598
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3563082352 3176039879 38410767
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3015429704 3979406008 128685864
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1913427402 2131043562 4446641
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2235159285 1419841841 190190495
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3673886186 4108974732 21762983
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891504291 1610032336 393086726
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3927815169 3425645240 193266884
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4121082053 3002154636 173885243
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2084864581 2004107154 83475349
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1917874043 557612753 69524983
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890516199 2003119062 988092
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766355924 2551492587 53969118
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1379546621 0 61140800
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3187625274 4130737715 6207444
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528804063 627137736 237551861
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1987399026 230411125 97465555
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1906459681 2544524866 6967721
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2184647884 1369330440 50511401
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2425349780 2091158499 39885063
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2181071888 2087582503 3575996
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3144115568 4142506842 43509706
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1766577141 2188156270 30478876
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359533738 61140800 169270325
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129797665 327876680 229736073
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3906843763 4234703846 20971406
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3601493119 2929761569 72393067
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water-to-light map:
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2375927917 1595026882 126334140
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1307603095 818620477 43777869
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2050676589 1855896418 112224406
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3618302244 2909504698 119958941
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3078570200 3088215627 6211083
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3084781283 3094426710 141266337
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524666822 53020621 149058240
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673725062 862398346 147671362
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2364320682 2577001713 11607235
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1941578413 1584221500 10805382
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2162900995 2536766467 40235246
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162015400 237365123 4480592
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821396424 241845715 141336168
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166495992 1138498800 212882164
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4277433486 4220367555 17533810
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3226047620 2229635217 307131250
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2909428734 1968120824 34606070
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1885573816 3954749082 56004597
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2711875933 2868267590 41237108
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0 726306378 92314099
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2944034804 1721361022 134535396
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1584221500 3392008740 301352316
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962732592 34415039 18605582
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2235705153 2101019688 128615529
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4252936467 4237901365 24497019
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92314099 202078861 35286262
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981338174 400041457 326264921
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379378156 1010069708 128429092
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3591930858 3693361056 26371386
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3785017329 3719732442 235016640
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2502262057 4010753679 209613876
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3533178870 3029463639 58751988
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3738261185 2821511446 46756144
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4020033969 2806534555 14976891
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1952383795 2002726894 98292794
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127600361 0 34415039
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2753113041 3235693047 156315693
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507807248 383181883 16859574
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2203136241 4262398384 32568912
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4035010860 2588608948 217925607
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light-to-temperature map:
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2137189745 1335050925 100355790
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639139367 2440321747 987829
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1663612748 1778059435 153830272
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1122754252 1950103191 82536600
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1929621334 1199531530 135519395
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1286703174 2032639791 207137687
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245313533 981575774 217955756
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2597564380 2824691125 293777778
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895004176 331442633 25226735
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1493840861 236388681 616173
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1494457034 764560381 107637728
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1817443020 1435406715 112178314
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1205290852 356669368 33552643
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474799702 0 164339665
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2341054397 2260378974 100255179
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1043066658 2360634153 79687594
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125852143 390222011 119461390
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3924383937 3130691909 13614218
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2467721984 3747288823 76649669
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2065140729 164339665 72049016
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920230911 1673437172 104622263
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640127196 509683401 254876980
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1024853174 1931889707 18213484
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2331983314 2251307891 9071083
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2237545535 237004854 94437779
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3912160931 3118468903 12223006
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1238843495 933716095 47859679
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3326002417 3517222025 230066798
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3556069215 3144306127 241363224
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3797432439 4180238804 114728492
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1602094762 872198109 61517986
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2544371653 4127046077 53192727
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2891342158 3823938492 303107585
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463269289 2239777478 11530413
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3194449743 3385669351 131552674
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3937998155 2467721984 356969141
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0 1547585029 125852143
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temperature-to-humidity map:
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2687600833 2313887435 187105587
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3281196981 2291603041 22284394
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1771250828 1899269239 314167725
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784031720 478456148 306959384
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2605226464 1771250828 58348072
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2085418553 3793564740 111907603
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1090991104 785415532 575136195
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3437652344 1829598900 69670339
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2874706420 2500993022 389039942
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3303481375 3905472343 134170969
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305575572 0 478456148
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3263746362 2890032964 17450619
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2527060387 2213436964 78166077
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2428623843 3695128196 98436544
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2663574536 4270940999 24026297
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3507322683 2907483583 787644613
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2197326156 4039643312 231297687
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0 1360551727 305575572
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humidity-to-location map:
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1919184105 1156349110 51114849
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4031284281 3411510751 25609498
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0 171183359 79004094
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1253227229 2072782209 122019778
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4056893779 3437120249 136289693
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3402931364 4156827458 101778985
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84557792 1207463959 134801591
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635909965 1371746366 266495395
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4029464617 4127764171 1819664
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4193183472 2857352625 101783824
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1375247007 2200355685 41445634
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1996492203 0 171183359
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3601595563 3699895117 427869054
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2218993186 1133540977 22808133
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3217192942 2959136449 140385316
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2987922009 4258606443 9236491
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2628749093 2543337773 86365212
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2167675562 369831582 51317624
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3504710349 2446452559 96885214
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902405360 421149206 108869392
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3357578258 2811999519 45353106
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1196458443 1638241761 56768786
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1178674352 693035436 17784091
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1970298954 530018598 26193249
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2868723842 3099521765 91954544
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1522874936 895259169 18612073
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2841599480 4267842934 27124362
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1880563756 1695010547 38620349
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1011274752 913871242 137918784
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219359383 556211847 136823589
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1785350971 250187453 95212785
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2960678386 4129583835 27243623
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540622614 1977494858 95287351
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356182972 710819527 184439642
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1498443592 345400238 24431344
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1416692641 1051790026 81750951
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1541487009 1733630896 243863962
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79004094 2194801987 5553698
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1149193536 1342265550 29480816
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2997158500 3191476309 220034442
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2715114305 3573409942 126485175
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2446452559 2629702985 182296534
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