104 lines
2.0 KiB
Rust
104 lines
2.0 KiB
Rust
#![feature(test)]
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extern crate test;
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use std::{collections::HashSet, env};
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fn main() {
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let input = parse_input(&read_input());
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println!("Part 1: {}", part1(&input));
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println!("Part 2: {}", part2(&input));
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}
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fn read_input() -> String {
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std::fs::read_to_string(
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env::args()
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.nth(1)
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.filter(|n| n != "--bench")
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.unwrap_or_else(|| String::from("inputs/day06")),
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)
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.unwrap()
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}
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fn parse_input(raw: &str) -> Vec<Vec<HashSet<char>>> {
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raw.split("\n\n")
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.map(|group| group.lines().map(|l| l.chars().collect()).collect())
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.collect()
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}
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fn part1(answers: &[Vec<HashSet<char>>]) -> usize {
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answers.iter().map(|v| v.iter().fold(HashSet::new(), |a, b| &a | b).len()).sum()
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}
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fn part2(answers: &[Vec<HashSet<char>>]) -> usize {
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answers.iter().map(|v| v.iter().fold(v[0].clone(), |a, b| &a & b).len()).sum()
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use test::black_box;
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const TEST_INPUT: &str = "abc
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a
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b
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c
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ab
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ac
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a
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a
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a
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a
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b";
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const TEST_INPUT_2: &str = "fsl
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fsg
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fs
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fts
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sf
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a
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bdfghjkl
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hdcl
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cdlh
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hdcl
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hldc
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ldhc";
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#[test]
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fn part1_test() {
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assert_eq!(part1(&parse_input(TEST_INPUT)), 11);
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}
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fn part2_help(answers: &[Vec<HashSet<char>>]) -> Vec<usize> {
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answers.iter().map(|v| v.iter().fold(v[0].clone(), |a, b| &a & b).len()).collect()
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}
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#[test]
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fn part2_test() {
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assert_eq!(part2_help(&parse_input(TEST_INPUT_2)), vec![2, 0, 4]);
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assert_eq!(part2(&parse_input(TEST_INPUT)), 6);
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}
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#[bench]
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fn bench_input_parsing(b: &mut test::Bencher) {
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let s = read_input();
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b.iter(|| assert_eq!(parse_input(black_box(&s)).len(), 490))
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}
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#[bench]
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fn bench_part2(b: &mut test::Bencher) {
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let i = parse_input(&read_input());
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b.iter(|| assert_eq!(part2(black_box(&i)), 3221))
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}
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#[bench]
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fn bench_part1(b: &mut test::Bencher) {
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let i = parse_input(&read_input());
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b.iter(|| assert_eq!(part1(black_box(&i)), 6735))
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}
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}
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