diff options
| author | Justin Wernick <justin@worthe-it.co.za> | 2023-12-14 13:53:12 +0200 |
|---|---|---|
| committer | Justin Wernick <justin@worthe-it.co.za> | 2023-12-14 13:53:12 +0200 |
| commit | e37434b49728141f92a3002fdb0a2f07108db28f (patch) | |
| tree | 715c65ade45fa4c9317dd6e57990c2d92554b9f5 | |
| parent | d985f2802d65691ee18b23c261cb2b12b7e6146f (diff) | |
Day 13 part 1
| -rw-r--r-- | 2023/inputs/day_13.txt | 1345 | ||||
| -rw-r--r-- | 2023/src/bin/day_13.rs | 74 |
2 files changed, 1411 insertions, 8 deletions
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+.#..#.### +#.#....## +#.######. +......#.# +.#....#.# +#.######. +#.#....## +.#..#.### + +.##...#..#...##.. +##..#.####.#..### +#......#.......## +##..#..##..#..### +..###..##..###... +#..#..####..#..## +#.##.#....#.##.## +#.##.#....#.##.## +.###.#....#.###.. diff --git a/2023/src/bin/day_13.rs b/2023/src/bin/day_13.rs index b3a610b..b2ef8aa 100644 --- a/2023/src/bin/day_13.rs +++ b/2023/src/bin/day_13.rs @@ -1,19 +1,77 @@ -use nom::IResult; +use nom::{ + character::complete::{line_ending, one_of}, + combinator::map, + multi::{many1, separated_list1}, + sequence::pair, + IResult, +}; use std::fs; fn main() -> Result<(), Box<dyn std::error::Error>> { - let input = fs::read_to_string("inputs/day_2.txt")?; - let parsed = Example::parser(&input).unwrap().1; - dbg!(&parsed); + let input = fs::read_to_string("inputs/day_13.txt")?; + let parsed = ManyMaps::parser(&input).unwrap().1; + dbg!(&parsed.reflection_score_sum()); Ok(()) } #[derive(Debug)] -struct Example; +struct ManyMaps(Vec<Map>); -impl Example { - fn parser(_input: &str) -> IResult<&str, Self> { - todo!() +#[derive(Debug)] +struct Map { + rows: Vec<String>, + cols: Vec<String>, +} + +impl ManyMaps { + fn parser(input: &str) -> IResult<&str, Self> { + map( + separated_list1(pair(line_ending, line_ending), Map::parser), + ManyMaps, + )(input) + } + + fn reflection_score_sum(&self) -> usize { + self.0.iter().map(|m| m.reflection_score()).sum() + } +} + +impl Map { + fn parser(input: &str) -> IResult<&str, Self> { + map(separated_list1(line_ending, many1(one_of(".#"))), |rows| { + Map { + rows: rows + .iter() + .map(|char_array| char_array.iter().collect::<String>()) + .collect(), + cols: (0..rows[0].len()) + .map(|i| rows.iter().map(|row| row[i]).collect::<String>()) + .collect(), + } + })(input) + } + + fn reflection_score(&self) -> usize { + reflection_i(&self.cols) + .or_else(|| reflection_i(&self.rows).map(|y| y * 100)) + .expect("No reflection!") + } +} + +fn reflection_i(rows: &[String]) -> Option<usize> { + for i in 1..rows.len() { + let mut is_reflection = true; + let mut d = 1; + while is_reflection && d <= i && d + i - 1 < rows.len() { + if rows[i - d] != rows[i + d - 1] { + is_reflection = false; + } + d += 1; + } + if is_reflection { + return Some(i); + } } + None } |