52 lines
1.1 KiB
Rust
52 lines
1.1 KiB
Rust
use aoc_runner_derive::{aoc as aoc_run, aoc_generator};
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type TRange = (u32, u32);
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type Assignments = (TRange, TRange);
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#[aoc_generator(day4)]
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fn parse_input(input: &str) -> Vec<Assignments> {
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let mut out = Vec::with_capacity(input.len());
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for line in input.lines() {
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let (a, b) = line.split_once(',').unwrap();
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let assignment = (get_range(a), get_range(b));
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out.push(assignment);
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}
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out
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}
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#[aoc_run(day4, part1)]
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fn part1(scheds: &[Assignments]) -> u32 {
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let mut out = 0;
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for (a, b) in scheds {
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if contains(a, b) || contains(b, a) {
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out += 1;
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}
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}
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out
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}
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#[aoc_run(day4, part2)]
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fn part2(scheds: &[Assignments]) -> u32 {
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let mut out = 0;
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for (a, b) in scheds {
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if overlaps(a, b) || overlaps(b, a) {
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out += 1;
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}
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}
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out
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}
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fn get_range(r: &str) -> TRange {
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let (lo, hi) = r.split_once('-').unwrap();
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(lo.parse().unwrap(), hi.parse().unwrap())
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}
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fn contains(a: &TRange, b: &TRange) -> bool {
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a.0 <= b.0 && b.1 <= a.1
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}
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fn overlaps(a: &TRange, b: &TRange) -> bool {
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a.0 <= b.0 && b.0 <= a.1
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}
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