39 lines
958 B
Rust
39 lines
958 B
Rust
pub fn part_one(input: &str) -> Option<u32> {
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let count = input.matches('(').count() - input.matches(')').count();
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Some(count as u32)
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}
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pub fn part_two(input: &str) -> Option<u32> {
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let mut floor = 0;
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for (idx, c) in input.trim().chars().enumerate() {
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match c {
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'(' => floor += 1,
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')' => floor -= 1,
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_ => panic!("oops {}", c),
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};
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if floor < 0 {
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return Some(idx as u32 + 1);
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}
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}
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None
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}
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fn main() {
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let input = &aoc::read_file("inputs", 1);
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aoc::solve!(1, part_one, input);
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aoc::solve!(2, part_two, input);
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_part_one() {
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let input = aoc::read_file("test_inputs", 1);
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assert_eq!(part_one(&input), Some(3));
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}
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#[test]
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fn test_part_two() {
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let input = aoc::read_file("test_inputs", 1);
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assert_eq!(part_two(&input), Some(11));
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}
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}
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