83 lines
2.4 KiB
Rust
83 lines
2.4 KiB
Rust
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use std::fs;
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fn main() {
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const FILE_PATH: &str = "input.txt";
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println!("Hi this is the third day of AOC2022, first we will read the file {}", FILE_PATH);
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let contents = fs::read_to_string(FILE_PATH)
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.expect("Should have been able to read the file");
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println!("The sum of the priorities is: {}", &contents.lines().map(|l| get_priori(get_repeat(l))).sum::<u32>());
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println!("The sum of the badges is: {}", get_groups(&contents).iter().map(|g| get_priori(grup_repeat(g))).sum::<u32>());
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}
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fn get_priori(c: char) -> u32{
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let priori = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
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priori.find(c).expect("must be a letre") as u32 + 1
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}
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fn get_groups(s: &str) -> Vec<Vec<&str>>{
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let mut out = Vec::new();
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let mut lines = s.lines();
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loop {
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let mut grup = Vec::new();
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if let Some(line) = lines.next() {
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grup.push(line);
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grup.push(lines.next().expect("what"));
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grup.push(lines.next().expect("Wharrr"))
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}else{break;}
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out.push(grup);
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}
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out
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}
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fn grup_repeat(grup: &Vec<&str>) -> char{
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let mut repeated = Vec::new();
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for c in grup[0].chars(){
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if let Some(i) = grup[1].find(c){
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repeated.push(grup[1].chars().nth(i).expect("should have failed before"));
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}
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};
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for c in repeated {
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if let Some(i) = grup[2].find(c){
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return (grup[2].chars().nth(i).expect("should have failed before"));
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}
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};
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return panic!();
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}
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fn get_repeat(s: &str) -> char{
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let slen = s.len();
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let s1 = &s[0..slen/2];
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let s2 = &s[slen/2..slen];
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for c in s1.chars(){
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if let Some(i) = s2.find(c){
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return s2.chars().nth(i).expect("should have failed before");
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}
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};
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return panic!();
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}
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#[cfg(test)]
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mod test {
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use super::*;
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#[test]
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fn it_works() {
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let input = r#"vJrwpWtwJgWrhcsFMMfFFhFp
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jqHRNqRjqzjGDLGLrsFMfFZSrLrFZsSL
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PmmdzqPrVvPwwTWBwg
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wMqvLMZHhHMvwLHjbvcjnnSBnvTQFn
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ttgJtRGJQctTZtZT
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CrZsJsPPZsGzwwsLwLmpwMDw"#;
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assert_eq!(input.lines().map(|l| get_priori(get_repeat(l))).sum::<u32>(), 157);
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}
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#[test]
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fn it_works2() {
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let input = r#"vJrwpWtwJgWrhcsFMMfFFhFp
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jqHRNqRjqzjGDLGLrsFMfFZSrLrFZsSL
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PmmdzqPrVvPwwTWBwg
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wMqvLMZHhHMvwLHjbvcjnnSBnvTQFn
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ttgJtRGJQctTZtZT
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CrZsJsPPZsGzwwsLwLmpwMDw"#;
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assert_eq!(get_groups(input).iter().map(|g| get_priori(grup_repeat(g))).sum::<u32>(), 70);
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}
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}
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