commit 4343ab1026c5d18225de8d96be8a10b0f86c28e4 · aylac.top/advent_of_code

2025/4/rust/Cargo.lock

···

       1
       1
       +
       # This file is automatically @generated by Cargo.

     

       2
       2
       +
       # It is not intended for manual editing.

     

       3
       3
       +
       version = 4

     

       4
       4
       +
       

     

       5
       5
       +
       [[package]]

     

       6
       6
       +
       name = "rust"

     

       7
       7
       +
       version = "0.1.0"

2025/4/rust/Cargo.toml

···

       1
       1
       +
       [package]

     

       2
       2
       +
       name = "rust"

     

       3
       3
       +
       version = "0.1.0"

     

       4
       4
       +
       edition = "2024"

     

       5
       5
       +
       

     

       6
       6
       +
       [dependencies]

+73

2025/4/rust/src/main.rs

···

       1
       1
       +
       use std::mem::swap;

     

       2
       2
       +
       

     

       3
       3
       +
       fn generations(mut world: Vec<u8>, size: usize, part_2: bool) -> u32 {

     

       4
       4
       +
           let pos = |x, y| y * (size + 2) + x;

     

       5
       5
       +
       

     

       6
       6
       +
           let sizep = size + 1;

     

       7
       7
       +
       

     

       8
       8
       +
           let mut new_world = vec![0_u8; (size + 2).pow(2)];

     

       9
       9
       +
       

     

       10
       10
       +
           let mut rolls = 0;

     

       11
       11
       +
       

     

       12
       12
       +
           loop {

     

       13
       13
       +
               for yo in 1..sizep {

     

       14
       14
       +
                   let ym = yo - 1;

     

       15
       15
       +
                   let yp = yo + 1;

     

       16
       16
       +
                   for xo in 1..sizep {

     

       17
       17
       +
                       let xm = xo - 1;

     

       18
       18
       +
                       let xp = xo + 1;

     

       19
       19
       +
       

     

       20
       20
       +
                       unsafe {

     

       21
       21
       +
                           let was = *world.get_unchecked(pos(xo, yo)) == 1;

     

       22
       22
       +
                           let neighbours = world.get_unchecked(pos(xm, ym))

     

       23
       23
       +
                               + world.get_unchecked(pos(xo, ym))

     

       24
       24
       +
                               + world.get_unchecked(pos(xp, ym))

     

       25
       25
       +
                               + world.get_unchecked(pos(xm, yo))

     

       26
       26
       +
                               + world.get_unchecked(pos(xp, yo))

     

       27
       27
       +
                               + world.get_unchecked(pos(xm, yp))

     

       28
       28
       +
                               + world.get_unchecked(pos(xo, yp))

     

       29
       29
       +
                               + world.get_unchecked(pos(xp, yp));

     

       30
       30
       +
                           *new_world.get_unchecked_mut(pos(xo, yo)) =

     

       31
       31
       +
                               match (was, neighbours < 4) {

     

       32
       32
       +
                                   (true, true) => {

     

       33
       33
       +
                                       rolls += 1;

     

       34
       34
       +
                                       0

     

       35
       35
       +
                                   }

     

       36
       36
       +
                                   (true, false) => 1,

     

       37
       37
       +
                                   (_, _) => 0,

     

       38
       38
       +
                               };

     

       39
       39
       +
                       }

     

       40
       40
       +
                   }

     

       41
       41
       +
               }

     

       42
       42
       +
       

     

       43
       43
       +
               if !part_2 || world == new_world {

     

       44
       44
       +
                   break;

     

       45
       45
       +
               }

     

       46
       46
       +
       

     

       47
       47
       +
               swap(&mut world, &mut new_world);

     

       48
       48
       +
           }

     

       49
       49
       +
           rolls

     

       50
       50
       +
       }

     

       51
       51
       +
       

     

       52
       52
       +
       fn main() {

     

       53
       53
       +
           let input = include_str!("../../input.txt").trim();

     

       54
       54
       +
           let size = input.split_once("\n").expect("invalid input").0.len();

     

       55
       55
       +
           // reads the input but adds a line of buffer on the sides

     

       56
       56
       +
           let buffer_line = ".".repeat(size);

     

       57
       57
       +
           let input: Vec<u8> = format!("{buffer_line}\n{input}\n{buffer_line}")

     

       58
       58
       +
               .split("\n")

     

       59
       59
       +
               .map(|line| -> Vec<u8> {

     

       60
       60
       +
                   format!(".{}.", line)

     

       61
       61
       +
                       .chars()

     

       62
       62
       +
                       .map(|v| (v == '@') as u8)

     

       63
       63
       +
                       .collect()

     

       64
       64
       +
               })

     

       65
       65
       +
               .flatten()

     

       66
       66
       +
               .collect();

     

       67
       67
       +
       

     

       68
       68
       +
           let part_1 = generations(input.clone(), size, false);

     

       69
       69
       +
           println!("Part 1: {}", part_1);

     

       70
       70
       +
       

     

       71
       71
       +
           let part_2 = generations(input.clone(), size, true);

     

       72
       72
       +
           println!("Part 2: {}", part_2);

     

       73
       73
       +
       }