Completed day 10 part 1
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93
day10/Cargo.lock
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93
day10/Cargo.lock
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[[package]]
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10
day10/Cargo.toml
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10
day10/Cargo.toml
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[package]
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name = "day10"
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version = "0.1.0"
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authors = ["Tyler Hallada <tyler@hallada.net>"]
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edition = "2018"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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num = "0.2"
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30
day10/input/input.txt
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30
day10/input/input.txt
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.#.####..#.#...#...##..#.#.##.
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..#####.##..#..##....#..#...#.
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......#.......##.##.#....##..#
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..#..##..#.###.....#.#..###.#.
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..#..#..##..#.#.##..###.......
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...##....#.##.#.#..##.##.#...#
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.##...#.#.##..#.#........#.#..
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.##...##.##..#.#.##.#.#.#.##.#
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#..##....#...###.#..##.#...##.
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.###.###..##......#..#...###.#
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.#..#.####.#..#....#.##..#.#.#
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..#...#..#.#######....###.....
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####..#.#.#...##...##....#..##
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##..#.##.#.#..##.###.#.##.##..
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..#.........#.#.#.#.......#..#
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...##.#.....#.#.##........#..#
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##..###.....#.............#.##
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.#...#....#..####.#.#......##.
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..#..##..###...#.....#...##..#
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...####..#.#.##..#....#.#.....
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####.#####.#.#....#.#....##.#.
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#.#..#......#.........##..#.#.
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#....##.....#........#..##.##.
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.###.##...##..#.##.#.#...#.#.#
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##.###....##....#.#.....#.###.
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..#...#......#........####..#.
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#....#.###.##.#...#.#.#.#.....
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.........##....#...#.....#..##
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###....#.........#..#..#.#.#..
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##...#...###.#..#.###....#.##.
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5
day10/input/test1.txt
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5
day10/input/test1.txt
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.#..#
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.....
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#####
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....#
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...##
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day10/input/test2.txt
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10
day10/input/test2.txt
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......#.#.
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#..#.#....
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..#######.
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.#.#.###..
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.#..#.....
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..#....#.#
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#..#....#.
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.##.#..###
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##...#..#.
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.#....####
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day10/input/test3.txt
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10
day10/input/test3.txt
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#.#...#.#.
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.###....#.
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.#....#...
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##.#.#.#.#
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....#.#.#.
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.##..###.#
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..#...##..
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..##....##
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......#...
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.####.###.
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day10/input/test4.txt
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10
day10/input/test4.txt
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.#..#..###
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####.###.#
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....###.#.
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..###.##.#
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##.##.#.#.
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....###..#
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..#.#..#.#
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#..#.#.###
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.##...##.#
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.....#.#..
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day10/input/test5.txt
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day10/input/test5.txt
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.#..##.###...#######
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##.############..##.
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.#.######.########.#
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.###.#######.####.#.
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#####.##.#.##.###.##
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..#####..#.#########
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####################
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#.####....###.#.#.##
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##.#################
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#####.##.###..####..
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..######..##.#######
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####.##.####...##..#
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.#####..#.######.###
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##...#.##########...
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#.##########.#######
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.####.#.###.###.#.##
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....##.##.###..#####
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.#.#.###########.###
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#.#.#.#####.####.###
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###.##.####.##.#..##
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154
day10/src/main.rs
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154
day10/src/main.rs
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use std::collections::HashMap;
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use std::error::Error;
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use std::fs::File;
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use std::io::{prelude::*, BufReader};
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use std::result;
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use num::integer::gcd;
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const INPUT: &str = "input/input.txt";
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type Result<T> = result::Result<T, Box<dyn Error>>;
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#[derive(Debug, PartialEq, Eq, Clone, Copy, Hash)]
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struct Point {
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x: usize,
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y: usize,
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}
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#[derive(Debug, PartialEq)]
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struct AsteroidField {
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asteroids: Vec<Point>,
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}
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impl AsteroidField {
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fn find_monitoring_station(&self) -> (&Point, usize) {
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let mut asteroid_detect_scores = HashMap::new();
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for asteroid in self.asteroids.iter() {
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let mut lines_of_sight: HashMap<(i32, i32), Point> = HashMap::new();
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for other in self.asteroids.iter() {
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if asteroid != other {
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let x_dist: i32 = other.x as i32 - asteroid.x as i32;
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let y_dist: i32 = other.y as i32 - asteroid.y as i32;
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let mut x_ratio: i32 = 0;
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let mut y_ratio: i32 = 0;
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if x_dist == 0 {
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if y_dist > 0 {
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y_ratio = 1;
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} else {
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y_ratio = -1;
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}
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} else if y_dist == 0 {
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if x_dist > 0 {
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x_ratio = 1;
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} else {
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x_ratio = -1;
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}
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} else {
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let gcd = gcd(x_dist, y_dist);
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x_ratio = x_dist / gcd;
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y_ratio = y_dist / gcd;
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}
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lines_of_sight
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.entry((x_ratio, y_ratio))
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.and_modify(|current| {
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if (current.x as i32 - asteroid.x as i32).abs() > x_dist.abs()
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&& (current.y as i32 - asteroid.y as i32).abs() > y_dist.abs()
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{
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current.x = other.x;
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current.y = other.y;
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}
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})
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.or_insert(other.clone());
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}
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}
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asteroid_detect_scores.insert(asteroid, lines_of_sight.len());
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}
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asteroid_detect_scores
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.into_iter()
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.max_by_key(|score| score.1)
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.expect("No asteroid detect scores")
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}
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}
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fn read_asteroid_field(filename: &str) -> Result<AsteroidField> {
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let file = File::open(filename)?;
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let reader = BufReader::new(file);
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let mut asteroids = vec![];
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for (y, line) in reader.lines().enumerate() {
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for (x, contents) in line?.chars().enumerate() {
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if contents == '#' {
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asteroids.push(Point { x, y });
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}
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}
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}
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Ok(AsteroidField { asteroids })
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}
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fn solve_part1() -> Result<usize> {
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let asteroid_field = read_asteroid_field(INPUT)?;
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Ok(asteroid_field.find_monitoring_station().1)
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}
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fn solve_part2() -> Result<i64> {
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Ok(1)
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}
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fn main() -> Result<()> {
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println!("Part 1: {}", solve_part1()?);
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println!("Part 2: {}", solve_part2()?);
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Ok(())
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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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const TEST_INPUT1: &str = "input/test1.txt";
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const TEST_INPUT2: &str = "input/test2.txt";
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const TEST_INPUT3: &str = "input/test3.txt";
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const TEST_INPUT4: &str = "input/test4.txt";
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const TEST_INPUT5: &str = "input/test5.txt";
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#[test]
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fn reads_asteroid_field() {
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assert_eq!(
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read_asteroid_field(TEST_INPUT1).unwrap(),
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AsteroidField {
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asteroids: vec![
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Point { x: 1, y: 0 },
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Point { x: 4, y: 0 },
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Point { x: 0, y: 2 },
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Point { x: 1, y: 2 },
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Point { x: 2, y: 2 },
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Point { x: 3, y: 2 },
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Point { x: 4, y: 2 },
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Point { x: 4, y: 3 },
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Point { x: 3, y: 4 },
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Point { x: 4, y: 4 },
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]
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},
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)
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}
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#[test]
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fn finds_monitoring_stations() {
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for (input, monitoring_point) in [
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(TEST_INPUT1, Point { x: 3, y: 4 }),
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(TEST_INPUT2, Point { x: 5, y: 8 }),
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(TEST_INPUT3, Point { x: 1, y: 2 }),
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(TEST_INPUT4, Point { x: 6, y: 3 }),
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(TEST_INPUT5, Point { x: 11, y: 13 }),
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]
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.iter()
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{
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let asteroid_field = read_asteroid_field(input).unwrap();
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assert_eq!(asteroid_field.find_monitoring_station().0, monitoring_point);
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}
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}
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}
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