82 lines
1.6 KiB
Rust
82 lines
1.6 KiB
Rust
#![feature(test)]
|
|
extern crate test;
|
|
use std::ops::Range;
|
|
|
|
use aoc2023::{boilerplate, common::*};
|
|
use itertools::Itertools;
|
|
|
|
const DAY: usize = 5;
|
|
type I = i64;
|
|
type Mapping = Vec<(Range<I>, I)>;
|
|
type Parsed = (Vec<I>, Vec<Mapping>);
|
|
|
|
fn parse_input(raw: &str) -> Parsed {
|
|
let mut groups = raw.split("\n\n");
|
|
let seeds = groups.next().unwrap().trim_start_matches("seeds: ").split(' ').map(parse_num).collect();
|
|
let ranges = groups
|
|
.map(|g| {
|
|
g.lines()
|
|
.skip(1)
|
|
.map(|l| l.split(' ').map(parse_num).collect_tuple().unwrap())
|
|
.map(|(dst, src, len)| (src..src + len, dst - src))
|
|
.collect()
|
|
})
|
|
.collect();
|
|
(seeds, ranges)
|
|
}
|
|
|
|
fn resolve(start: I, mappings: &Vec<Mapping>) -> I {
|
|
mappings.iter().fold(start, |i, map| map.iter().find_map(|(range, offset)| range.contains(&i).then_some(i + offset)).unwrap_or(i))
|
|
}
|
|
|
|
fn part1((seeds, mappings): &Parsed) -> I {
|
|
seeds.iter().map(|&s| resolve(s, mappings)).min().unwrap()
|
|
}
|
|
|
|
fn part2(parsed: &Parsed) -> I {
|
|
unimplemented!()
|
|
}
|
|
|
|
boilerplate! {
|
|
TEST_INPUT == "seeds: 79 14 55 13
|
|
|
|
seed-to-soil map:
|
|
50 98 2
|
|
52 50 48
|
|
|
|
soil-to-fertilizer map:
|
|
0 15 37
|
|
37 52 2
|
|
39 0 15
|
|
|
|
fertilizer-to-water map:
|
|
49 53 8
|
|
0 11 42
|
|
42 0 7
|
|
57 7 4
|
|
|
|
water-to-light map:
|
|
88 18 7
|
|
18 25 70
|
|
|
|
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",
|
|
tests: {
|
|
part1: { TEST_INPUT => 35 },
|
|
part2: { TEST_INPUT => 0 },
|
|
},
|
|
bench1 == 462648396,
|
|
bench2 == 0,
|
|
bench_parse: |(v1, v2): &Parsed| (v1.len(), v2.len()) => (20, 7),
|
|
}
|