feat: solve day 20 part 1 & 2
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input/20.txt
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102
input/20.txt
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.#####...#....#....##.#.####....###..#.##...#.##..##..###.#.##.##.##...#.###..###.###...###...##.#..
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235
src/day20.rs
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235
src/day20.rs
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use std::{ops::Range, fmt::Display};
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#[derive(Clone, Debug)]
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pub struct Image {
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width: usize,
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height: usize,
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data: Vec<bool>,
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default_value: bool,
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offset_x: i32,
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offset_y: i32
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}
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impl Image {
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fn new(width: usize, height: usize) -> Image {
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let data = vec![false; width*height];
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Image {
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width,
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height,
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data,
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default_value: false,
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offset_x: 0,
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offset_y: 0
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}
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}
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fn get(&self, x: i32, y: i32) -> bool {
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if self.in_bounds(x, y) {
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let index = (y + self.offset_y) * self.width as i32 + (x + self.offset_x);
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*self.data.get(index as usize).unwrap_or(&self.default_value)
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} else {
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self.default_value
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}
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}
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fn set(&mut self, x: i32, y: i32, value: bool) {
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// Make image larger if it is too small
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let (left, top, right, bottom) = self.bounds();
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if !(left <= x && x < right && top <= y && y < bottom) {
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if x < left {
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self.offset_x = -x;
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self.width = self.width + (-x + left) as usize;
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} else if x >= right {
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self.width = self.width + 1 + (x - right) as usize;
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}
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if y < top {
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self.offset_y = -y;
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self.height = self.height + (-y + top) as usize;
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} else if y >= bottom {
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self.height = self.height + 1 + (y - bottom) as usize;
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}
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let mut new_data = Vec::new();
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for y in self.y_range(0) {
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for x in self.x_range(0) {
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new_data.push(self.get(x, y));
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}
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}
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self.data = new_data;
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}
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let index = ((y + self.offset_y) * self.width as i32 + (x + self.offset_x)) as usize;
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self.data[index] = value;
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}
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fn in_bounds(&self, x: i32, y: i32) -> bool {
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let (left, top, right, bottom) = self.bounds();
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left <= x && x < right && top <= y && y < bottom
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}
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fn count(&self, value: bool) -> usize {
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if self.default_value == value {
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usize::MAX
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} else {
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self.data.iter().filter(|x| **x == value).count()
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}
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}
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fn x_range(&self, padding: u32) -> Range<i32> {
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let padding = padding as i32;
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Range {
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start: -self.offset_x - padding,
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end: self.width as i32 - self.offset_x + padding
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}
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}
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fn y_range(&self, padding: u32) -> Range<i32> {
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let padding = padding as i32;
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Range {
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start: -self.offset_y - padding,
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end: self.height as i32 - self.offset_y + padding
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}
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}
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// (i32, i32, i32, i32) => (left, top, right, bottom)
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fn bounds(&self) -> (i32, i32, i32, i32) {
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return (
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-self.offset_x,
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-self.offset_y,
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self.width as i32 - self.offset_x,
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self.height as i32 - self.offset_y
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);
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}
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}
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impl Display for Image {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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let mut grid = String::new();
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for y in self.y_range(1) {
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for x in self.x_range(1) {
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let symbol = if self.get(x, y) { '#' } else { '.' };
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grid.push(symbol);
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}
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grid.push('\n');
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}
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write!(f, "{}", grid)
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}
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}
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fn parse_image(input: &str) -> Image {
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let mut image = Image::new(3, 3);
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let mut y = 0;
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for line in input.lines() {
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let mut x = 0;
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for c in line.chars() {
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image.set(x, y, c == '#');
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x += 1;
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}
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y += 1
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}
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return image;
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}
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fn parse_enchancer(input: &str) -> [bool; 512] {
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let mut enhancer = [false; 512];
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let mut i = 0;
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for c in input.chars() {
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enhancer[i] = c == '#';
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i+=1;
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}
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return enhancer
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}
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pub fn parse_input(input: &str) -> ([bool; 512], Image) {
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let (section1, section2) = input.split_once("\n\n").unwrap();
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return (
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parse_enchancer(section1),
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parse_image(section2)
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);
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}
|
||||
|
||||
fn lookup_enhancer(x: i32, y: i32, image: &Image, enhancer: &[bool; 512]) -> bool {
|
||||
let pixel_offsets = [
|
||||
(-1, -1), ( 0, -1), ( 1, -1),
|
||||
(-1, 0), ( 0, 0), ( 1, 0),
|
||||
(-1, 1), ( 0, 1), ( 1, 1)
|
||||
];
|
||||
|
||||
let mut lookup_index = 0;
|
||||
for i in 0..9 {
|
||||
let (ox, oy) = pixel_offsets[i];
|
||||
let pixel = image.get(x + ox, y + oy);
|
||||
if pixel {
|
||||
lookup_index += 2usize.pow((8-i) as u32)
|
||||
}
|
||||
}
|
||||
|
||||
enhancer[lookup_index]
|
||||
}
|
||||
|
||||
fn enhance(image: &Image, enhancer: &[bool; 512]) -> Image {
|
||||
let mut enhanced = image.clone();
|
||||
for y in image.y_range(1) {
|
||||
for x in image.x_range(1) {
|
||||
enhanced.set(x, y, lookup_enhancer(x, y, image, enhancer));
|
||||
}
|
||||
}
|
||||
|
||||
if image.default_value {
|
||||
enhanced.default_value = enhancer[511];
|
||||
} else {
|
||||
enhanced.default_value = enhancer[0];
|
||||
}
|
||||
|
||||
enhanced
|
||||
}
|
||||
|
||||
pub fn part1(data: &([bool; 512], Image)) -> usize {
|
||||
let (enhancer, image) = data;
|
||||
let mut enhanced_image = enhance(&image, enhancer);
|
||||
enhanced_image = enhance(&enhanced_image, enhancer);
|
||||
enhanced_image.count(true)
|
||||
}
|
||||
|
||||
pub fn part2(data: &([bool; 512], Image)) -> usize {
|
||||
let (enhancer, image) = data;
|
||||
let mut enhanced_image = enhance(&image, enhancer);
|
||||
for _ in 0..49 {
|
||||
enhanced_image = enhance(&enhanced_image, enhancer);
|
||||
}
|
||||
enhanced_image.count(true)
|
||||
}
|
||||
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use super::*;
|
||||
|
||||
#[test]
|
||||
fn part1_example() {
|
||||
let input = parse_input("..#.#..#####.#.#.#.###.##.....###.##.#..###.####..#####..#....#..#..##..###..######.###...####..#..#####..##..#.#####...##.#.#..#.##..#.#......#.###.######.###.####...#.##.##..#..#..#####.....#.#....###..#.##......#.....#..#..#..##..#...##.######.####.####.#.#...#.......#..#.#.#...####.##.#......#..#...##.#.##..#...##.#.##..###.#......#.#.......#.#.#.####.###.##...#.....####.#..#..#.##.#....##..#.####....##...##..#...#......#.#.......#.......##..####..#...#.#.#...##..#.#..###..#####........#..####......#..#
|
||||
|
||||
#..#.
|
||||
#....
|
||||
##..#
|
||||
..#..
|
||||
..###");
|
||||
let result = part1(&input);
|
||||
assert_eq!(result, 35);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn part2_example() {
|
||||
let input = parse_input("..#.#..#####.#.#.#.###.##.....###.##.#..###.####..#####..#....#..#..##..###..######.###...####..#..#####..##..#.#####...##.#.#..#.##..#.#......#.###.######.###.####...#.##.##..#..#..#####.....#.#....###..#.##......#.....#..#..#..##..#...##.######.####.####.#.#...#.......#..#.#.#...####.##.#......#..#...##.#.##..#...##.#.##..###.#......#.#.......#.#.#.####.###.##...#.....####.#..#..#.##.#....##..#.####....##...##..#...#......#.#.......#.......##..####..#...#.#.#...##..#.#..###..#####........#..####......#..#
|
||||
|
||||
#..#.
|
||||
#....
|
||||
##..#
|
||||
..#..
|
||||
..###");
|
||||
let result = part2(&input);
|
||||
assert_eq!(result, 3351);
|
||||
}
|
||||
}
|
||||
@ -72,6 +72,8 @@ fn run(day: i32, part: i32, input_filename: &str) {
|
||||
"18.2" => println!("{}", day18::part2(&day18::parse_input(&contents))),
|
||||
"19.1" => println!("{}", day19::part1(&day19::parse_input(&contents))),
|
||||
"19.2" => println!("{}", day19::part2(&day19::parse_input(&contents))),
|
||||
"20.1" => println!("{}", day20::part1(&day20::parse_input(&contents))),
|
||||
"20.2" => println!("{}", day20::part2(&day20::parse_input(&contents))),
|
||||
_ => println!("Day {} part {} not found", day, part)
|
||||
}
|
||||
}
|
||||
@ -97,4 +99,3 @@ fn main() {
|
||||
}
|
||||
run(day, part, &input_filename);
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user