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use advent_of_code::prelude::*;
pub fn parse(fh: File) -> Result<impl Iterator<Item = String>> {
Ok(parse::raw_lines(fh))
}
pub fn part1(lines: impl Iterator<Item = String>) -> Result<usize> {
let mut yes = HashSet::new();
let mut total = 0;
for line in lines {
if line.is_empty() {
total += yes.len();
yes = HashSet::new();
} else {
for c in line.chars() {
yes.insert(c);
}
}
}
total += yes.len();
Ok(total)
}
pub fn part2(lines: impl Iterator<Item = String>) -> Result<usize> {
let mut yes = HashSet::new();
for c in 'a'..='z' {
yes.insert(c);
}
let mut total = 0;
for line in lines {
if line.is_empty() {
total += yes.len();
yes = HashSet::new();
for c in 'a'..='z' {
yes.insert(c);
}
} else {
for c in 'a'..='z' {
if !line.contains(c) {
yes.remove(&c);
}
}
}
}
total += yes.len();
Ok(total)
}
#[test]
fn test() {
assert_eq!(
part1(parse(parse::data(2020, 6).unwrap()).unwrap()).unwrap(),
6930
);
assert_eq!(
part2(parse(parse::data(2020, 6).unwrap()).unwrap()).unwrap(),
3585
);
}
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