Day 8 rust
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133
rust/src/main.rs
133
rust/src/main.rs
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@ -263,8 +263,131 @@ mod day05 {
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}
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}
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mod day06 {
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use std::time::Duration;
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pub fn run(_: bool) -> Duration {
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Duration::new(0, 0)
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}
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}
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mod day07 {
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use std::time::Duration;
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pub fn run(_: bool) -> Duration {
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Duration::new(0, 0)
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}
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}
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mod day08 {
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use std::{
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collections::HashSet,
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time::{Duration, Instant},
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};
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#[derive(Debug, Copy, Clone)]
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enum Instruction {
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Acc(i32),
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Jmp(i32),
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Nop,
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}
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fn part1(instructions: &[Instruction]) -> (i32, Vec<i32>) {
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let mut accumulator = 0;
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let mut pc = 0;
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let mut pc_history = HashSet::new();
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let mut jumps = Vec::new();
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loop {
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match instructions[pc as usize] {
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Instruction::Acc(i) => accumulator += i,
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Instruction::Jmp(i) => {
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let target = pc + i - 1;
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if !pc_history.insert(target) {
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break (accumulator, jumps);
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}
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jumps.push(pc);
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pc += i - 1
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}
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Instruction::Nop => (),
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};
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pc += 1;
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}
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}
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fn part2(instructions: &[Instruction], skip: i32) -> Option<i32> {
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let mut accumulator = 0;
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let mut pc = 0;
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let mut pc_history = HashSet::new();
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loop {
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if pc != skip {
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match instructions.get(pc as usize) {
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Some(Instruction::Acc(i)) => accumulator += i,
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Some(Instruction::Jmp(i)) => {
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let target = pc + i;
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if !pc_history.insert(target) {
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break None;
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}
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pc = target - 1;
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}
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Some(Instruction::Nop) => (),
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None => break Some(accumulator),
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};
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}
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pc += 1;
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}
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}
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pub fn run(print: bool) -> Duration {
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let input = std::fs::read_to_string("inputs/day08").unwrap();
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let instant = Instant::now();
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let instructions: Vec<_> = input
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.lines()
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.map(|line| {
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let operation = &line[0..3];
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let value: i32 = line[4..].parse().unwrap();
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match operation {
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"acc" => Instruction::Acc(value),
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"jmp" => Instruction::Jmp(value),
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"nop" => Instruction::Nop,
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_ => unreachable!(operation),
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}
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})
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.collect();
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let (part1, jumps) = part1(&instructions);
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let part2 = jumps
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.iter()
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.rev()
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.find_map(|skip_pc| part2(&instructions, *skip_pc))
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.unwrap();
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let elapsed = instant.elapsed();
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if print {
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dbg!(elapsed, part1, part2);
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}
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elapsed
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}
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}
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fn main() {
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let days = [day01::run, day02::run, day03::run, day04::run, day05::run];
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let days = [
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day01::run,
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day02::run,
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day03::run,
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day04::run,
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day05::run,
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day06::run,
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day07::run,
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day08::run,
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];
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if let Some(day) = std::env::args().nth(1) {
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let day: usize = day.parse().expect("day not an integer");
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@ -276,11 +399,15 @@ fn main() {
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let mut total = Duration::new(0, 0);
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for day in 0..days.len() {
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let mut elapsed = Duration::new(0, 0);
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for _ in 0..repetitions {
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total += days[day](false) / repetitions;
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elapsed += days[day](false) / repetitions;
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}
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println!("Day {:>2}: {:?}", day + 1, elapsed);
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total += elapsed;
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}
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dbg!(total);
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println!("-------------------");
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println!("Total: {:?}", total);
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}
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}
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