blob: 21279afe96114b107574305af8c82c34428f0a9c (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
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
);
}
|