82 lines
1.6 KiB
Rust
82 lines
1.6 KiB
Rust
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#![feature(test)]
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extern crate test;
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use std::ops::Range;
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use aoc2023::{boilerplate, common::*};
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use itertools::Itertools;
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const DAY: usize = 5;
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type I = i64;
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type Mapping = Vec<(Range<I>, I)>;
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type Parsed = (Vec<I>, Vec<Mapping>);
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fn parse_input(raw: &str) -> Parsed {
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let mut groups = raw.split("\n\n");
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let seeds = groups.next().unwrap().trim_start_matches("seeds: ").split(' ').map(parse_num).collect();
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let ranges = groups
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.map(|g| {
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g.lines()
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.skip(1)
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.map(|l| l.split(' ').map(parse_num).collect_tuple().unwrap())
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.map(|(dst, src, len)| (src..src + len, dst - src))
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.collect()
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})
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.collect();
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(seeds, ranges)
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}
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fn resolve(start: I, mappings: &Vec<Mapping>) -> I {
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mappings.iter().fold(start, |i, map| map.iter().find_map(|(range, offset)| range.contains(&i).then_some(i + offset)).unwrap_or(i))
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}
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fn part1((seeds, mappings): &Parsed) -> I {
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seeds.iter().map(|&s| resolve(s, mappings)).min().unwrap()
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}
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fn part2(parsed: &Parsed) -> I {
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unimplemented!()
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}
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boilerplate! {
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TEST_INPUT == "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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tests: {
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part1: { TEST_INPUT => 35 },
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part2: { TEST_INPUT => 0 },
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},
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bench1 == 462648396,
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bench2 == 0,
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bench_parse: |(v1, v2): &Parsed| (v1.len(), v2.len()) => (20, 7),
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}
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