commit 881c0eea210a117c2ac1681f6ed4d101e9e6e17d · aylac.top/advent_of_code

2015/18/rust/Cargo.lock

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       # This file is automatically @generated by Cargo.

     

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       # It is not intended for manual editing.

     

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       version = 4

     

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       [[package]]

     

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       name = "rust"

     

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       version = "0.1.0"

2015/18/rust/Cargo.toml

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       [package]

     

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       name = "rust"

     

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       version = "0.1.0"

     

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       edition = "2024"

     

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       [dependencies]

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2015/18/rust/src/main.rs

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       use std::mem::swap;

     

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       #[inline]

     

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       fn get_at(world: &Vec<Vec<bool>>, size: usize, x: isize, y: isize) -> u8 {

     

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           let isize = size as isize;

     

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           if x == isize || x == -1 || y == isize || y == -1 {

     

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               return 0;

     

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           };

     

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           if *world

     

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               .get(y as usize)

     

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               .expect("invalid position")

     

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               .get(x as usize)

     

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               .expect("invalid position")

     

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           {

     

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               1

     

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           } else {

     

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               0

     

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           }

     

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       }

     

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       #[inline]

     

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       fn get_at_bool(world: &Vec<Vec<bool>>, x: usize, y: usize) -> bool {

     

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           *world

     

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               .get(y)

     

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               .expect("invalid position")

     

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               .get(x)

     

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               .expect("invalid position")

     

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       }

     

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       fn generations(times: u32, mut world: Vec<Vec<bool>>, size: usize, stuck: bool) -> Vec<Vec<bool>> {

     

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           let mut new_world = vec![vec![false; size]; size];

     

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           if stuck {

     

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               let sizem = size - 1;

     

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               world[0][0] = true;

     

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               world[0][sizem] = true;

     

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               world[sizem][0] = true;

     

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               world[sizem][sizem] = true;

     

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           }

     

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           for _ in 0..times {

     

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               for y in 0..size {

     

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                   for x in 0..size {

     

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                       let xo = x as isize;

     

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                       let yo = y as isize;

     

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                       let xm = xo - 1;

     

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                       let ym = yo - 1;

     

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                       let xp = xo + 1;

     

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                       let yp = yo + 1;

     

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                       let was = get_at_bool(&world, x, y);

     

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                       let neighbours = get_at(&world, size, xm, ym)

     

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                           + get_at(&world, size, xo, ym)

     

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                           + get_at(&world, size, xp, ym)

     

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                           + get_at(&world, size, xm, yo)

     

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                           + get_at(&world, size, xp, yo)

     

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                           + get_at(&world, size, xm, yp)

     

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                           + get_at(&world, size, xo, yp)

     

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                           + get_at(&world, size, xp, yp);

     

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                       new_world[y][x] = neighbours == 3 || (neighbours == 2 && was);

     

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                   }

     

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               }

     

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               swap(&mut world, &mut new_world);

     

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               // i hate the duplication here :(

     

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               if stuck {

     

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                   let sizem = size - 1;

     

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                   world[0][0] = true;

     

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                   world[0][sizem] = true;

     

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                   world[sizem][0] = true;

     

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                   world[sizem][sizem] = true;

     

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               }

     

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           }

     

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           world

     

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       }

     

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       fn main() {

     

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           let input = include_str!("../../input.txt").trim();

     

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           let size = input.split_once("\n").expect("invalid input").0.len();

     

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           let input: Vec<Vec<bool>> = input

     

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               .split("\n")

     

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               .map(|line| line.chars().map(|v| v == '#').collect())

     

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               .collect();

     

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           let part_1 = generations(100, input.clone(), size, false)

     

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               .iter()

     

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               .flatten()

     

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               .filter(|v| **v)

     

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               .count();

     

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           println!("Part 1: {}", part_1);

     

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           let part_2 = generations(100, input.clone(), size, true)

     

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               .iter()

     

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               .flatten()

     

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               .filter(|v| **v)

     

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               .count();

     

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           println!("Part 2: {}", part_2);

     

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       }