day 14
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Acvaxoort
parent
e3d4b31f88
commit
34c7808394
7
day14/Cargo.lock
generated
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7
day14/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 = 3
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[[package]]
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name = "day14"
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version = "0.1.0"
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8
day14/Cargo.toml
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8
day14/Cargo.toml
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[package]
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name = "day14"
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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]
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100
day14/input.txt
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100
day14/input.txt
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#.OO..O..O..#.O..#..O....O.#O#.OO.O#.#...#...........O..O..O#.O....#......#........O....O.O.O.#..O..
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##.#..O#....O...#...O....#.......#.#..#..O...#O##...O#...O...#..........O.#O....OO..........#.......
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....O..O.##..#.....O....##..OOO....O.O....O.....OO#O.O#.....##O.##.O.O.#..OO.OO.##.O.#........OO....
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.O.O#...#OO.#..O.#..#.##.#.......O#O.O......O.O......OO..O....#.O........#.#....#.O#O.#..O#O......O.
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.OO..#.O.#.....O#O..#..#.#....O.O####.#.O.O#OO......O........#O.O#OO#O..O.O......O.O.O#...#.O..O...O
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....O..O...##...##.##.O...#......#.O..O#O...O#O..OO....OO.#..#O#.OOO.#..#..O....#OO....#...O.#O..OO.
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#..O#..#..#..O.O.O..#..O.O#.O.....OO....O...O.OO#OO....O.#O..O.O......O..OOO...O#OO..OO.O#....O.OO..
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O.O.....O...##..#...#.O.#.#..O..O................O.#..OO.#....#......O#O..O.#.O.#..#O...........O..#
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.....OO..O..OO...O.#..........O.#O.........OO#.............#..OO...##.#.#.OO.O.O.#.##.#.OO.OOO......
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.O.....#.O#..#..##.OO......#........#...O.#O.#..O#O.O.OO...##......O..O.....#..O...O.O.OO.O.O.#O##.O
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O....O.O..#.#...#..O.#O...#O.O..OOO.....O.#..O.O.#..#...#..O.....#..#..##...........###.....#...OO.#
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..#.....O.OO...O#........O..#O.....O.....OO...#..#.OOO......O#.#.O.O.##O.#..........O.#..O..OOO.....
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..O..#..#.O....O.#.........OO.#...O.....OO.#..O..#....O...#..#...##..OOO....#..O#....#.......O.#O.O#
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190
day14/src/main.rs
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day14/src/main.rs
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use std::hash::Hasher;
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use std::collections::hash_map::DefaultHasher;
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use std::fs::read_to_string;
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use std::hash::Hash;
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use std::time::Instant;
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// For task 1
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fn slide_rock_north(platform: &mut Vec<Vec<u8>>, col: usize, row: usize) -> i32 {
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let mut steps = 0;
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let mut current_row = row;
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while current_row > 0 {
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let new_row = current_row - 1;
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if platform[new_row][col] != b'.' {
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break;
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}
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platform[new_row][col] = b'O';
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platform[current_row][col] = b'.';
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steps += 1;
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current_row = new_row
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}
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steps
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}
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// Slides all rocks on platform north, returns change of load
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fn slide_platform_north(platform: &mut Vec<Vec<u8>>) -> i32 {
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let rows = platform.len();
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let cols = platform[0].len();
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let mut load_change = 0;
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for row in 1..rows {
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for col in 0..cols {
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if platform[row][col] != b'O' {
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continue;
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}
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let mut sliding_row = row;
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while sliding_row > 0 {
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let new_row = sliding_row - 1;
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if platform[new_row][col] != b'.' {
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break;
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}
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load_change += 1;
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platform[new_row][col] = b'O';
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platform[sliding_row][col] = b'.';
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sliding_row = new_row
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}
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}
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}
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load_change
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}
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// Slides all rocks on platform south, returns change of load
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fn slide_platform_south(platform: &mut Vec<Vec<u8>>) -> i32 {
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let rows = platform.len();
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let cols = platform[0].len();
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let mut load_change = 0;
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for row in (0..rows - 1).rev() {
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for col in 0..cols {
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if platform[row][col] != b'O' {
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continue;
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}
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let mut sliding_row = row;
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while sliding_row < rows - 1 {
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let new_row = sliding_row + 1;
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if platform[new_row][col] != b'.' {
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break;
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}
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load_change -= 1;
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platform[new_row][col] = b'O';
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platform[sliding_row][col] = b'.';
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sliding_row = new_row
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}
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}
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}
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load_change
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}
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// Slides all rocks on platform west, there's no change in load
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||||
fn slide_platform_west(platform: &mut Vec<Vec<u8>>) {
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let rows = platform.len();
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let cols = platform[0].len();
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for row in 0..rows {
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||||
for col in 1..cols {
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if platform[row][col] != b'O' {
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||||
continue;
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}
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let mut sliding_col = col;
|
||||
while sliding_col > 0 {
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||||
let new_col = sliding_col - 1;
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||||
if platform[row][new_col] != b'.' {
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||||
break;
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||||
}
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||||
platform[row][new_col] = b'O';
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platform[row][sliding_col] = b'.';
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sliding_col = new_col
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}
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}
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}
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}
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// Slides all rocks on platform east, there's no change in load
|
||||
fn slide_platform_east(platform: &mut Vec<Vec<u8>>) {
|
||||
let rows = platform.len();
|
||||
let cols = platform[0].len();
|
||||
for row in 0..rows {
|
||||
for col in (0..cols - 1).rev() {
|
||||
if platform[row][col] != b'O' {
|
||||
continue;
|
||||
}
|
||||
let mut sliding_col = col;
|
||||
while sliding_col < cols - 1 {
|
||||
let new_col = sliding_col + 1;
|
||||
if platform[row][new_col] != b'.' {
|
||||
break;
|
||||
}
|
||||
platform[row][new_col] = b'O';
|
||||
platform[row][sliding_col] = b'.';
|
||||
sliding_col = new_col
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn hash_platform(platform: &Vec<Vec<u8>>) -> u64 {
|
||||
let mut hasher = DefaultHasher::new();
|
||||
platform.hash(&mut hasher);
|
||||
hasher.finish()
|
||||
}
|
||||
|
||||
fn main() {
|
||||
let time_start = Instant::now();
|
||||
let input_str = read_to_string("input.txt").unwrap();
|
||||
let time_start_no_io = Instant::now();
|
||||
let mut platform: Vec<Vec<u8>> = vec![];
|
||||
let mut sum1 = 0;
|
||||
let mut num_rocks = 0;
|
||||
// Solve task 1 while loading the data
|
||||
for line in input_str.lines() {
|
||||
platform.push(Vec::from(line.as_bytes()));
|
||||
sum1 += num_rocks;
|
||||
let last_row = platform.len() - 1;
|
||||
for (i, c) in line.bytes().enumerate() {
|
||||
if c == b'O' {
|
||||
num_rocks += 1;
|
||||
sum1 += 1 + slide_rock_north(&mut platform, i, last_row);
|
||||
}
|
||||
}
|
||||
}
|
||||
// Task 2
|
||||
let mut load = sum1;
|
||||
// Complete the first cycle
|
||||
slide_platform_west(&mut platform);
|
||||
load += slide_platform_south(&mut platform);
|
||||
slide_platform_east(&mut platform);
|
||||
let mut history_hashes: Vec::<u64> = vec![hash_platform(&platform)];
|
||||
let mut history_loads: Vec::<i32> = vec![load];
|
||||
let mut completed_cycles = 1;
|
||||
let mut len_repeat_cycle = 0;
|
||||
while completed_cycles < 1000000000 {
|
||||
load += slide_platform_north(&mut platform);
|
||||
slide_platform_west(&mut platform);
|
||||
load += slide_platform_south(&mut platform);
|
||||
slide_platform_east(&mut platform);
|
||||
// Check if this value happened before
|
||||
let mut history_pos = completed_cycles - 1;
|
||||
let new_hash = hash_platform(&platform);
|
||||
loop {
|
||||
if history_hashes[history_pos] == new_hash {
|
||||
len_repeat_cycle = completed_cycles - history_pos;
|
||||
}
|
||||
if history_pos == 0 {
|
||||
break;
|
||||
}
|
||||
history_pos -= 1;
|
||||
}
|
||||
completed_cycles += 1;
|
||||
history_hashes.push(new_hash);
|
||||
history_loads.push(load);
|
||||
if len_repeat_cycle != 0 {
|
||||
break;
|
||||
}
|
||||
}
|
||||
const FINAL_CYCLE: usize = 1000000000;
|
||||
let offset_final = (FINAL_CYCLE - completed_cycles) % len_repeat_cycle;
|
||||
let elapsed = time_start.elapsed().as_micros();
|
||||
let elapsed_no_io = time_start_no_io.elapsed().as_micros();
|
||||
println!("Time: {}us", elapsed);
|
||||
println!("Time without file i/o: {}us", elapsed_no_io);
|
||||
println!("Load after first tilt: {}", sum1);
|
||||
println!("Completed cycles: {}, repeat: {}", completed_cycles, len_repeat_cycle);
|
||||
println!("Load after {} cycles: {}", FINAL_CYCLE, history_loads[completed_cycles - len_repeat_cycle - 1 + offset_final]);
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user