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use std::fs::File;
use std::io::{BufRead, BufReader};
fn appears(s: &str, n: usize) -> bool {
s.chars().any(|c| s.matches(c).count() == n)
}
fn same_but_one(s: &str, t: &str) -> Option<String> {
let mut x = s.chars().zip(t.chars()).enumerate().filter(|(_, (a,b))| a != b);
match (x.next(), x.next()) {
(Some(m), None) => Some(format!("{}{}", &s[..m.0], &s[m.0+1..])),
_ => None
}
}
fn main() {
let f = File::open("day02").unwrap();
let v: Vec<_> = BufReader::new(&f).lines().map(|l| l.unwrap()).collect();
println!("{}",
v.iter().filter(|s| appears(s, 2)).count() *
v.iter().filter(|s| appears(s, 3)).count());
'outer: for x in &v {
for y in &v {
if let Some(s) = same_but_one(&x, &y) {
println!("{}", s);
break 'outer;
}
}
}
}
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