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pub fn parse(
fh: std::fs::File,
) -> anyhow::Result<impl Iterator<Item = String>> {
Ok(crate::util::parse::lines(fh))
}
pub fn part1(lines: impl Iterator<Item = String>) -> anyhow::Result<i64> {
let mut yes = std::collections::HashSet::new();
let mut total = 0;
for line in lines {
if line.is_empty() {
total += yes.len() as i64;
yes = std::collections::HashSet::new();
} else {
for c in line.chars() {
yes.insert(c);
}
}
}
total += yes.len() as i64;
Ok(total)
}
pub fn part2(lines: impl Iterator<Item = String>) -> anyhow::Result<i64> {
let mut yes = std::collections::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() as i64;
yes = std::collections::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() as i64;
Ok(total)
}
#[test]
fn test() {
assert_eq!(
part1(parse(crate::util::data(2020, 6).unwrap()).unwrap()).unwrap(),
6930
);
assert_eq!(
part2(parse(crate::util::data(2020, 6).unwrap()).unwrap()).unwrap(),
3585
);
}
|
