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rust(day17): Optimize to run in 34 ms

This commit is contained in:
Sijmen 2020-12-23 15:53:25 +01:00
parent 7b6e8f05e0
commit 90e0a3060e
Signed by: vijfhoek
GPG Key ID: DAF7821E067D9C48
3 changed files with 73 additions and 123 deletions
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50
rust/Cargo.lock generated
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1
rust/Cargo.toml
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@ -7,4 +7,3 @@ edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies] [dependencies]
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145
rust/src/day17.rs
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@ -1,99 +1,100 @@
use std::time::{Duration, Instant}; use std::time::{Duration, Instant};
const SIZE: usize = 50; const SIZE: usize = 20;
const OFFSET: usize = SIZE / 2; const OFFSET: usize = SIZE / 2;
type Field = Vec<Vec<Vec<bool>>>; type Field = Vec<[[[bool; SIZE]; SIZE]; SIZE]>;
pub fn step(field: &mut Field) { pub fn step(hypercube: &mut Field) {
let mut changes = Vec::new(); let mut changes = Vec::new();
for (z, slice) in field.iter().enumerate() { for w in 0..hypercube.len() as i64 {
for (y, row) in slice.iter().enumerate() { for z in 0..SIZE as i64 {
for (x, cell) in row.iter().enumerate() { for y in 0..SIZE as i64 {
let mut neighbors = 0; for x in 0..SIZE as i64 {
for dz in -1..=1 { let mut neighbors = 0;
for dy in -1..=1 { for dw in -1..=1 {
for dx in -1..=1 { for dz in -1..=1 {
let nx = dx + x as i64; for dy in -1..=1 {
let ny = dy + y as i64; for dx in -1..=1 {
let nz = dz + z as i64; let nx = dx + x;
let ny = dy + y;
let nz = dz + z;
let nw = dw + w;
if (nx == x as i64 && ny == y as i64 && nz == z as i64) if !(nx == x && ny == y && nz == z && nw == w)
|| (nx < 0 || nx >= SIZE as i64) && !(nx < 0 || nx >= SIZE as i64)
|| (ny < 0 || ny >= SIZE as i64) && !(ny < 0 || ny >= SIZE as i64)
|| (nz < 0 || nz >= SIZE as i64) && !(nz < 0 || nz >= SIZE as i64)
{ && !(nw < 0 || nw >= hypercube.len() as i64)
continue; && hypercube[nw as usize][nz as usize][ny as usize]
} [nx as usize]
{
if field[nz as usize][ny as usize][nx as usize] { neighbors += 1;
neighbors += 1; }
}
} }
} }
} }
}
if *cell && neighbors != 2 && neighbors != 3 { let cell = hypercube[w as usize][z as usize][y as usize][x as usize];
changes.push((x, y, z, false)); if cell && neighbors != 2 && neighbors != 3 {
} changes.push((x, y, z, w, false));
if !cell && neighbors == 3 { }
changes.push((x, y, z, true)); if !cell && neighbors == 3 {
changes.push((x, y, z, w, true));
}
} }
} }
} }
} }
for (x, y, z, state) in changes { for (x, y, z, w, state) in changes {
field[z][y][x] = state; hypercube[w as usize][z as usize][y as usize][x as usize] = state;
} }
} }
pub fn run(_: bool) -> Duration { pub fn simulate(input: &str, n: usize) -> usize {
assert!(n == 3 || n == 4);
let w_size = if n == 3 { 1 } else { SIZE };
let w_offset = if n == 3 { 0 } else { OFFSET };
let mut field = vec![[[[false; SIZE]; SIZE]; SIZE]; w_size];
for (y, line) in input.lines().enumerate() {
for (x, cell) in line.chars().enumerate() {
field[w_offset][OFFSET][y + OFFSET - 2][x + OFFSET - 2] = cell == '#';
}
}
for _ in 0..6 {
step(&mut field);
}
let mut alive = 0;
for cube in field {
for slice in &cube {
for row in slice {
for &cell in row {
if cell {
alive += 1;
}
}
}
}
}
alive
}
pub fn run(print: bool) -> Duration {
let input = std::fs::read_to_string("../inputs/17").unwrap(); let input = std::fs::read_to_string("../inputs/17").unwrap();
let instant = Instant::now(); let instant = Instant::now();
let mut field = vec![vec![vec![false; SIZE]; SIZE]; SIZE]; let part1 = simulate(&input, 3);
for (y, line) in input.lines().enumerate() { let part2 = simulate(&input, 4);
for (x, cell) in line.chars().enumerate() { if print {
field[OFFSET][y + OFFSET - 1][x + OFFSET - 1] = cell == '#'; dbg!(part1, part2);
}
} }
// for y in 0..SIZE {
// for x in 0..SIZE {
// print!("{}", if field[OFFSET][y][x] { '#' } else { '.' });
// }
// println!();
// }
for i in 0..6 {
step(&mut field);
println!("step {}:", i + 1);
// for z in (OFFSET - 1)..=(OFFSET + 1) {
// println!("z = {}", z as i64 - OFFSET as i64);
// for y in 0..SIZE {
// for x in 0..SIZE {
// print!("{}", if field[z][y][x] { '#' } else { '.' });
// }
// println!();
// }
// println!();
// }
}
let mut alive = 0;
for slice in field {
for row in slice {
for cell in row {
if cell {
alive += 1;
}
}
}
}
dbg!(alive);
instant.elapsed() instant.elapsed()
} }