56 lines
1.2 KiB
Rust
56 lines
1.2 KiB
Rust
#![feature(iter_array_chunks, test)]
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extern crate test;
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use aoc2022::{boilerplate, common::*};
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const DAY: usize = 2;
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fn round([other, _, own, _]: [u8; 4]) -> usize {
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(match other.wrapping_sub(own - b'X' + b'A') {
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0 => 3 + own - b'W',
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1 | 254 => 0 + own - b'W',
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2 | 255 => 6 + own - b'W',
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_ => unreachable!(),
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}) as usize
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}
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fn round_p2([other, _, own, _]: [u8; 4]) -> usize {
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(match own {
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b'X' => other - b'A' + (3 * (other == b'A') as u8),
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b'Y' => other - b'A' + 4,
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b'Z' => other - b'A' + 8 - (3 * (other == b'C') as u8),
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_ => unreachable!(),
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}) as usize
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}
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fn parse_input(raw: &str) -> &str {
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raw
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}
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fn part1(parsed: &str) -> usize {
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parsed.bytes().array_chunks().map(round).sum()
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}
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fn part2(parsed: &str) -> usize {
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parsed.bytes().array_chunks().map(round_p2).sum()
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}
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boilerplate! {
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TEST_INPUT == "A Y
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B X
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C Z
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",
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tests: {
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part1: { TEST_INPUT => 15 },
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part2: {
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TEST_INPUT => 12,
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"A X\n" => 3,
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"C X\n" => 2,
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"A Y\n" => 4,
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"A Z\n" => 8,
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},
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},
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bench1 == 13268,
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bench2 == 15508,
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bench_parse: str::len => 10000,
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}
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