72 lines
1.2 KiB
Rust
72 lines
1.2 KiB
Rust
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use std::collections::HashSet;
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use aoc_runner_derive::{aoc, aoc_generator};
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use itertools::Itertools;
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#[aoc_generator(day6, part1)]
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fn parse(input: &str) -> Vec<usize> {
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input.split("\n\n")
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.map(|group| {
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group.chars()
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.filter(|char| !char.is_ascii_whitespace())
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.collect::<HashSet<_>>().len()
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}).collect_vec()
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}
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#[aoc(day6, part1)]
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fn part1(input: &Vec<usize>) -> usize {
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input.iter().sum()
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}
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#[aoc_generator(day6, part2)]
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fn parse2(input: &str) -> Vec<usize> {
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input.split("\n\n")
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.map(|group| {
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let people = group.lines().collect_vec();
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let mut first = people[0].chars().collect_vec();
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for person in &people[1..] {
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first = first.iter()
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.cloned()
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.filter(|question| person.contains(*question))
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.collect_vec()
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}
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first.len()
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}).collect_vec()
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}
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#[aoc(day6, part2)]
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fn part2(input: &Vec<usize>) -> usize {
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input.iter().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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const EX: &str = r"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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#[test]
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fn part1_example() {
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assert_eq!(part1(&parse(EX)), 11);
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}
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#[test]
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fn part2_example() {
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assert_eq!(part2(&parse2(EX)), 6);
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}
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}
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