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| 1 | +advent_of_code::solution!(1); |
| 2 | + |
| 3 | +pub fn part_one(input: &str) -> Option<u32> { |
| 4 | + let sum = input.lines().map(|line| { |
| 5 | + let mut digits = line.chars().filter(|c| c.is_digit(10)); |
| 6 | + let first = digits.next().expect("first should be there"); |
| 7 | + let last = digits.next_back().unwrap_or_else(|| first); |
| 8 | + let str = format!("{}{}", first, last); |
| 9 | + str.parse::<u32>().unwrap_or_else(|x| panic!("{}", x)) |
| 10 | + }).sum(); |
| 11 | + Some(sum) |
| 12 | +} |
| 13 | + |
| 14 | +pub fn part_two(input: &str) -> Option<u32> { |
| 15 | + let sum = input.lines().map(|line| { |
| 16 | + let fst = get_nr(line.chars().collect(), NAMES); |
| 17 | + let lst = get_nr(line.chars().rev().collect(), NAMES_REV); |
| 18 | + let str = format!("{}{}", fst, lst); |
| 19 | + str.parse::<u32>().unwrap_or_else(|x| panic!("{}", x)) |
| 20 | + }).sum(); |
| 21 | + Some(sum) |
| 22 | +} |
| 23 | + |
| 24 | +const NAMES: &[&str] = &[ |
| 25 | + "one", |
| 26 | + "two", |
| 27 | + "three", |
| 28 | + "four", |
| 29 | + "five", |
| 30 | + "six", |
| 31 | + "seven", |
| 32 | + "eight", |
| 33 | + "nine", |
| 34 | +]; |
| 35 | + |
| 36 | +const NAMES_REV: &[&str] = &[ |
| 37 | + "eno", |
| 38 | + "owt", |
| 39 | + "eerht", |
| 40 | + "ruof", |
| 41 | + "evif", |
| 42 | + "xis", |
| 43 | + "neves", |
| 44 | + "thgie", |
| 45 | + "enin", |
| 46 | +]; |
| 47 | + |
| 48 | +fn get_nr(chars: Vec<char>, names: &[&str]) -> u32 { |
| 49 | + for i in 0..chars.len() { |
| 50 | + match names.iter().position(|&name| |
| 51 | + chars[0..i].iter().collect::<String>().contains(name) |
| 52 | + ) { |
| 53 | + Some(i) => { |
| 54 | + return i as u32 + 1; |
| 55 | + } |
| 56 | + None => { |
| 57 | + match chars[i].to_digit(10) { |
| 58 | + Some(d) => { return d } |
| 59 | + None => {} |
| 60 | + } |
| 61 | + } |
| 62 | + } |
| 63 | + } |
| 64 | + return 0 |
| 65 | +} |
| 66 | + |
| 67 | + |
| 68 | +#[cfg(test)] |
| 69 | +mod tests { |
| 70 | + use super::*; |
| 71 | + |
| 72 | + #[test] |
| 73 | + fn test_part_one() { |
| 74 | + let result = part_one(&advent_of_code::template::read_file("examples", DAY)); |
| 75 | + assert_eq!(result, None); |
| 76 | + } |
| 77 | + |
| 78 | + #[test] |
| 79 | + fn test_part_two() { |
| 80 | + let result = part_two(&advent_of_code::template::read_file("examples", DAY)); |
| 81 | + assert_eq!(result, None); |
| 82 | + } |
| 83 | +} |
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