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+.#.#..####.#####. +##..##.##.##.#..# +..##.##..#.#.#.#. +..##.##..#.#.#.#. +##..##.##.##.#..# +.#.#..###..#####. +#.##......#.##### +..#......#..#.### +########.#...#.## +########...##.### +####......#.##..# +#.##.#.###..####. +#.##.#.###..####. +####......#.##..# diff --git a/13/src/main.rs b/13/src/main.rs new file mode 100644 index 0000000..d380727 --- /dev/null +++ b/13/src/main.rs @@ -0,0 +1,183 @@ +use std::fs::File; +use std::io::{BufRead, BufReader, Lines}; +use std::ops::Index; +use std::time::Instant; + +// BOILERPLATE +type InputIter = Lines>; + +fn get_input() -> InputIter { + let f = File::open("input").unwrap(); + let br = BufReader::new(f); + br.lines() +} + +fn main() { + let start = Instant::now(); + let ans1 = problem1(get_input()); + let duration = start.elapsed(); + println!("Problem 1 solution: {} [{}s]", ans1, duration.as_secs_f64()); + + let start = Instant::now(); + let ans2 = problem2(get_input()); + let duration = start.elapsed(); + println!("Problem 2 solution: {} [{}s]", ans2, duration.as_secs_f64()); +} + +// PARSE + +#[derive(Debug)] +struct Pattern { + mirrors: Vec>, +} + +impl Pattern { + fn width(&self) -> usize { + self.mirrors[0].len() + } + fn height(&self) -> usize { + self.mirrors.len() + } + fn col(&self, idx: usize) -> Vec { + self.mirrors.iter().map(|row| row[idx]).collect() + } + + fn find_horizontal_reflection(&self) -> Option { + println!("looking for horiz: {:?}", (1..self.height() - 1).collect::>()); + (1..self.height()).find(|idx| self.is_horizontal_reflection(*idx)) + } + + fn is_horizontal_reflection(&self, idx: usize) -> bool { + let row_pairs = std::cmp::min(idx, self.height() - idx); + (0..row_pairs).all(|offset| { + println!( + "{}: [{} == {}] {:?} == {:?}", + idx, + idx - offset - 1, + idx + offset, + self.mirrors[idx - offset - 1], + self.mirrors[idx + offset] + ); + self.mirrors[idx - offset - 1] == self.mirrors[idx + offset] + }) + } + + fn find_vertical_reflection(&self) -> Option { + println!("looking for vert: {:?}", (1..self.width() - 1).collect::>()); + (1..self.width() ).find(|idx| self.is_vertical_reflection(*idx)) + } + + fn is_vertical_reflection(&self, idx: usize) -> bool { + let col_pairs = std::cmp::min(idx, self.width() - idx); + (0..col_pairs).all(|offset| { + println!( + "{}: [{} == {}] {:?} == {:?}", + idx, + idx - offset - 1, + idx + offset, + self.col(idx - offset - 1), + self.col(idx + offset) + ); + self.col(idx - offset - 1) == self.col(idx + offset) + }) + } + + fn reflection_cost(&self) -> u64 { + if let Some(refl) = self.find_horizontal_reflection() { + println!("horizontal found at {}", refl); + 100 * refl as u64 + } else if let Some(refl) = self.find_vertical_reflection() { + println!("vertical found at {}", refl); + refl as u64 + } else { + panic!("no reflection"); + } + } +} + +#[derive(Debug)] +struct Patterns { + patterns: Vec, +} + +impl From> for Patterns { + fn from(mut lines: Lines) -> Self { + let mut patterns = Vec::new(); + let mut cur_lines = Vec::new(); + while let Some(Ok(line)) = lines.next() { + if line.len() == 0 { + patterns.push(Pattern { mirrors: cur_lines }); + cur_lines = Vec::new(); + } else { + cur_lines.push(line.chars().collect()); + } + } + patterns.push(Pattern { mirrors: cur_lines }); + Self { patterns } + } +} + +// PROBLEM 1 solution + +fn problem1(input: Lines) -> u64 { + let patterns = Patterns::from(input); + + patterns + .patterns + .iter() + .map(|pat| { println!("{:?}", pat); pat.reflection_cost() }) + .sum() +} + +// PROBLEM 2 solution +fn problem2(input: Lines) -> u64 { + 0 +} + +#[cfg(test)] +mod tests { + use crate::*; + use std::io::Cursor; + + const EXAMPLE: &str = &"#.##..##. +..#.##.#. +##......# +##......# +..#.##.#. +..##..##. +#.#.##.#. + +#...##..# +#....#..# +..##..### +#####.##. +#####.##. +..##..### +#....#..#"; + + #[test] + fn problem1_find_horizontal() { + let c = Cursor::new(EXAMPLE); + let patterns = Patterns::from(c.lines()); + assert_eq!(patterns.patterns[1].find_horizontal_reflection(), Some(4)); + } + + #[test] + fn problem1_find_vertical() { + let c = Cursor::new(EXAMPLE); + let patterns = Patterns::from(c.lines()); + assert_eq!(patterns.patterns[0].find_vertical_reflection(), Some(5)); + } + + #[test] + fn problem1_example() { + let c = Cursor::new(EXAMPLE); + assert_eq!(problem1(c.lines()), 405); + } + + #[test] + fn problem2_example() { + let c = Cursor::new(EXAMPLE); + assert_eq!(problem2(c.lines()), 0); + } +}