commit 604340294988acbf8593a75a1e661c3bcae67a44 · kokirigla.de/aoc2025

.gitignore

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       /target

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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 = 4

     

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       [[package]]

     

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       name = "anyhow"

     

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       version = "1.0.100"

     

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       source = "registry+https://github.com/rust-lang/crates.io-index"

     

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       checksum = "a23eb6b1614318a8071c9b2521f36b424b2c83db5eb3a0fead4a6c0809af6e61"

     

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       [[package]]

     

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       name = "aoc2025"

     

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       version = "0.1.0"

     

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       dependencies = [

     

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        "anyhow",

     

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       ]

Cargo.toml

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       [package]

     

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       name = "aoc2025"

     

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       version = "0.1.0"

     

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       edition = "2024"

     

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       [dependencies]

     

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       anyhow = "1"

README.md

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       # AOC 2025

     

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       my BLAZING FAST and MEMORY SAFE aoc solutions. 🚀🚀🚀🚀🚀🚀🚀🚀🚀🚀🚀🚀🚀🚀🚀🚀🚀🚀🚀

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src/day1.rs

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       use anyhow::Context;

     

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       const INPUT: &str = include_str!("input/1/actual.txt");

     

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       pub fn main() -> anyhow::Result<()> {

     

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           let rotations = Rotation::parse_file(INPUT).context("parsing input")?;

     

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           let mut dial = Dial::new(50, true);

     

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           dial.apply_rotations(&rotations);

     

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           println!("{:?}", dial);

     

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           Ok(())

     

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       }

     

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       #[derive(Debug)]

     

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       struct Dial {

     

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           value: i32,

     

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           times_left_at_zero: u32,

     

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           /// for extra challenge thing

     

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           extra_mode: bool,

     

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       }

     

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       impl Dial {

     

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           const SIZE: i32 = 100;

     

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           pub fn new(initial_value: i32, extra: bool) -> Dial {

     

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               Dial {

     

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                   value: initial_value,

     

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                   times_left_at_zero: 0,

     

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                   extra_mode: extra,

     

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               }

     

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           }

     

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           pub fn apply_rotations(&mut self, rotations: &Vec<Rotation>) {

     

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               rotations.iter().for_each(|rotation| {

     

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                   if self.extra_mode {

     

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                       self.times_left_at_zero += self.hits_zero_during(rotation);

     

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                       self.apply_rotation(rotation);

     

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                   } else {

     

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                       self.apply_rotation(rotation);

     

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                       if self.value == 0 {

     

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                           self.times_left_at_zero += 1;

     

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                       }

     

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                   }

     

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               });

     

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           }

     

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           fn apply_rotation(&mut self, rotation: &Rotation) {

     

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               match rotation.direction {

     

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                   Direction::Left => self.value -= rotation.amount,

     

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                   Direction::Right => self.value += rotation.amount,

     

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               }

     

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               self.value = self.value.rem_euclid(Self::SIZE);

     

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           }

     

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           fn hits_zero_during(&self, rotation: &Rotation) -> u32 {

     

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               if rotation.amount <= 0 {

     

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                   return 0;

     

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               }

     

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               // how many steps until next hit 0

     

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               // this gave me a headache. boy do i suck at maths.

     

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               // this is my punishment for sleeping through every maths class in school.

     

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               let turns_needed = match rotation.direction {

     

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                   Direction::Right => {

     

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                       if self.value == 0 {

     

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                           Self::SIZE

     

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                       } else {

     

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                           Self::SIZE - self.value

     

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                       }

     

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                   }

     

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                   Direction::Left => {

     

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                       if self.value == 0 {

     

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                           Self::SIZE

     

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                       } else {

     

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                           self.value

     

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                       }

     

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                   }

     

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               };

     

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               if rotation.amount < turns_needed {

     

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                   0

     

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               } else {

     

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                   1 + ((rotation.amount - turns_needed) / Self::SIZE) as u32

     

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               }

     

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           }

     

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       }

     

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       #[derive(Debug, PartialEq, Eq)]

     

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       enum Direction {

     

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           Left,

     

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           Right,

     

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       }

     

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       impl Direction {

     

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           pub fn parse(character: char) -> anyhow::Result<Direction> {

     

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               match character {

     

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                   'L' => Ok(Self::Left),

     

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                   'R' => Ok(Self::Right),

     

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                   _ => Err(anyhow::anyhow!("unknown direction char '{}'", character)),

     

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               }

     

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           }

     

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       }

     

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       #[derive(Debug)]

     

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       struct Rotation {

     

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           direction: Direction,

     

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           amount: i32,

     

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       }

     

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       impl Rotation {

     

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           pub fn parse_file(text: &str) -> anyhow::Result<Vec<Rotation>> {

     

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               text.lines().map(Rotation::parse).collect()

     

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           }

     

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           pub fn parse(line: &str) -> anyhow::Result<Rotation> {

     

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               let mut chars = line.chars();

     

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               let direction = Direction::parse(chars.next().context("popping first char")?)

     

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                   .context("parsing direction")?;

     

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               let amount = chars

     

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                   .collect::<String>()

     

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                   .parse::<i32>()

     

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                   .context("parsing remaining number")?;

     

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               Ok(Self { direction, amount })

     

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           }

     

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       }

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src/input/1/actual.txt

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src/input/1/example.txt

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src/main.rs

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       use anyhow::Context;

     

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       mod day1;

     

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       fn main() -> anyhow::Result<()> {

     

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           println!("day 1...");

     

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           day1::main().context("running day 1")?;

     

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           Ok(())

     

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       }