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Commit 44b5dc2

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finish day11
1 parent d86df6b commit 44b5dc2

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6 files changed

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‎day11/Cargo.lock‎

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‎day11/Cargo.toml‎

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[package]
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name = "day11"
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version = "0.1.0"
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edition = "2021"
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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]

‎day11/input/1.txt‎

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2566885432
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3857414357
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1716783173
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3371176148
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1162578285
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6144726367

‎day11/input/2.txt‎

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11111
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19991
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19191
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19991
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11111

‎day11/input/3.txt‎

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5483143223
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2745854711
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6141336146
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‎day11/src/main.rs‎

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const NEXT: [(i32, i32); 8] = [
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(-1, -1),
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(-1, 0),
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(-1, 1),
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(0, -1),
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(0, 1),
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(1, -1),
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(1, 0),
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(1, 1),
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];
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fn main() {
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let mut input = include_str!("../input/1.txt")
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.lines()
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.map(|l| {
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l.chars()
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.map(|w| w.to_digit(10).unwrap() as i32)
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.collect::<Vec<i32>>()
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})
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.collect::<Vec<_>>();
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// println!("{:?}", input);
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part1(&mut input.clone(), 100);
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part2(&mut input.clone());
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}
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fn part1(m: &mut Vec<Vec<i32>>, days: usize) {
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let mut ans: u64 = 0;
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for _ in 0..days {
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ans += grow(m);
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}
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println!("{}", ans);
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}
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fn part2(m: &mut Vec<Vec<i32>>) {
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let total_element: u64 = (m.len() * m[0].len()) as u64;
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let mut i: u64 = 0;
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loop {
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i += 1;
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if grow(m) == total_element {
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println!("{}", i);
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break;
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}
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}
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}
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fn grow(m: &mut Vec<Vec<i32>>) -> u64 {
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for i in 0..m.len() {
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for j in 0..m[0].len() {
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m[i][j] += 1;
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}
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}
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for i in 0..m.len() {
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for j in 0..m[0].len() {
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if m[i][j] > 9 {
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update(m, i, j);
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}
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}
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}
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let mut zero: u64 = 0;
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for i in 0..m.len() {
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for j in 0..m[0].len() {
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if m[i][j] == 0 {
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zero += 1;
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}
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}
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}
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zero
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}
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fn update(m: &mut Vec<Vec<i32>>, i: usize, j: usize) {
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if m[i][j] <= 9 {
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return;
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}
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m[i][j] = 0;
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for delta in NEXT {
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if valid(m, i as i32, j as i32, delta.0, delta.1) {
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if m[(i as i32 + delta.0) as usize][(j as i32 + delta.1) as usize] != 0 {
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m[(i as i32 + delta.0) as usize][(j as i32 + delta.1) as usize] += 1;
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if m[(i as i32 + delta.0) as usize][(j as i32 + delta.1) as usize] > 9 {
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update(
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m,
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(i as i32 + delta.0) as usize,
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(j as i32 + delta.1) as usize,
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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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fn valid(m: &Vec<Vec<i32>>, row: i32, col: i32, row_delta: i32, col_delta: i32) -> bool {
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0 <= row + row_delta
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&& row + row_delta < m.len() as i32
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&& 0 <= col + col_delta
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&& col + col_delta < m[0].len() as i32
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}

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