86 lines
2.2 KiB
Rust
86 lines
2.2 KiB
Rust
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#[macro_use]
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extern crate lazy_static;
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extern crate regex;
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use regex::Regex;
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struct Star {
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x: i32,
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y: i32,
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x_vel: i32,
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y_vel: i32,
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}
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impl Star {
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pub fn new(x: i32, y: i32, x_vel: i32, y_vel: i32) -> Self {
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Star {
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x, y, x_vel, y_vel
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}
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}
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}
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lazy_static! {
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static ref STAR_REGEX: Regex = Regex::new(r"position=<\s?(-?\d+),\s{1,2}(-?\d+)>\svelocity=<\s?(-?\d+),\s{1,2}(-?\d+)>").unwrap();
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}
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fn main() {
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let lines: Vec<&str> = include_str!("../input").lines().collect();
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let mut stars: Vec<Star> = lines.iter().map(|line| parse_star(line)).collect();
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let mut min_y: i32 = 0;
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let mut max_y: i32 = 11;
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let mut step = 0;
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while (max_y - min_y).abs() > 10 {
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stars.iter_mut().for_each(|star| {
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star.x += star.x_vel;
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star.y += star.y_vel;
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});
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min_y = stars.iter().min_by_key(|a| a.y).unwrap().y;
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max_y = stars.iter().max_by_key(|a| a.y).unwrap().y;
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step += 1;
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}
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// Part 1
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print_stars(&stars);
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// Part 2
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println!("{}", step);
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}
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fn print_stars(stars: &Vec<Star>) {
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let min_x = stars.iter().min_by_key(|a| a.x).unwrap().x;
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let max_x = stars.iter().max_by_key(|a| a.x).unwrap().x;
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let min_y= stars.iter().min_by_key(|a| a.y).unwrap().y;
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let max_y = stars.iter().max_by_key(|a| a.y).unwrap().y;
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let width: i32 = max_x - min_x;
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let height: i32 = max_y - min_y;
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let line = vec!('.'; (width + 1) as usize);
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let mut field = vec!(line.clone(); (height + 1) as usize);
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for star in stars {
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field[(star.y - min_y) as usize][(star.x - min_x) as usize] = '#';
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}
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for l in field {
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let s: String = l.into_iter().collect();
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println!("{}", s);
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}
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}
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fn parse_star(input: &str) -> Star {
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let captures = STAR_REGEX.captures(input).expect("unexpected input line");
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let (x, y, x_vel, y_vel): (i32, i32, i32, i32);
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x = captures.get(1).unwrap().as_str().parse::<i32>().unwrap();
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y = captures.get(2).unwrap().as_str().parse::<i32>().unwrap();
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x_vel = captures.get(3).unwrap().as_str().parse::<i32>().unwrap();
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y_vel = captures.get(4).unwrap().as_str().parse::<i32>().unwrap();
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return Star::new(x, y, x_vel, y_vel);
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}
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