rust(day23): Rust too
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@ -1,4 +1,6 @@
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rust/target
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callgrind.*
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*.prof
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c64/*.vs
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c64/*.prg
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@ -0,0 +1,91 @@
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use std::{time::Duration, time::Instant};
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fn step(cups: &mut [u32], current_label: u32, min: u32, max: u32) -> u32 {
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let a = cups[current_label as usize];
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let b = cups[a as usize];
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let c = cups[b as usize];
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let picked_up = &[a, b, c];
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cups[current_label as usize] = cups[c as usize];
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let mut destination = current_label - 1;
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if destination < min {
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destination = max;
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}
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while picked_up.contains(&destination) {
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destination -= 1;
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if destination < min {
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destination = max;
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}
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}
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cups[c as usize] = cups[destination as usize];
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cups[destination as usize] = a;
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cups[current_label as usize]
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}
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fn part1(labels: &[u32]) -> Option<u32> {
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let mut cups = vec![0; labels.len() + 1];
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for i in 0..labels.len() {
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cups[labels[i] as usize] = labels[(i + 1) % labels.len()];
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}
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let mut current = labels[0];
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let min = labels.iter().min()?;
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let max = labels.iter().max()?;
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for _ in 0..100 {
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current = step(&mut cups, current, *min, *max);
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}
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let mut result = 0;
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let mut label = 1;
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for _ in 0..8 {
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label = cups[label as usize];
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result = result * 10 + label;
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}
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Some(result)
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}
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fn part2(old_labels: &[u32]) -> Option<usize> {
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let mut labels = Vec::from(old_labels);
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labels.reserve(1_000_000);
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labels.extend((*old_labels.iter().max()? + 1)..=1_000_000);
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let cups = &mut [0; 1_000_001];
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for i in 0..labels.len() {
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cups[labels[i] as usize] = labels[(i + 1) % labels.len()];
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}
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let mut current = labels[0];
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let min = labels.iter().min()?;
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let max = labels.iter().max()?;
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for _ in 0..10_000_000 {
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current = step(cups, current, *min, *max);
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}
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let a = cups[1] as usize;
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let b = cups[a as usize] as usize;
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Some(a * b)
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}
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pub fn run(print: bool) -> Duration {
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let file_string = std::fs::read_to_string("../inputs/23").unwrap();
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let instant = Instant::now();
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let labels: Vec<u32> = file_string
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.trim()
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.chars()
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.map(|c| (c as u32 - '0' as u32))
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.collect();
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let part1 = part1(&labels).unwrap();
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let part2 = part2(&labels).unwrap();
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if print {
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dbg!(part1, part2);
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}
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instant.elapsed()
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}
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@ -22,6 +22,11 @@ mod day17;
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use nop as day18;
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mod day19;
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use nop as day20;
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use nop as day21;
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use nop as day22;
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mod day23;
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use nop as day24;
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use nop as day25;
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fn main() {
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let days = [
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@ -45,6 +50,11 @@ fn main() {
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day18::run,
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day19::run,
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day20::run,
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day21::run,
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day22::run,
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day23::run,
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day24::run,
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day25::run,
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];
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if let Some(day) = std::env::args().nth(1) {
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