66 lines
1.6 KiB
Rust
66 lines
1.6 KiB
Rust
use utils::load_string;
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const TEST_INPUT: &str =
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"L68
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L30
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R48
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L5
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R60
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L55
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L1
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L99
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R14
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L82";
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const START: u32 = 50;
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enum Rotation {
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Left(u32),
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Right(u32),
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}
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fn parse(input: &str) -> Vec<Rotation> {
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input.lines().map(|l| {
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let (indicator, number) = l.split_at(1);
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match indicator {
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"L" => Rotation::Left(number.parse().unwrap()),
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"R" => Rotation::Right(number.parse().unwrap()),
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_ => panic!("hey!")
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}
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}).collect()
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}
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fn gaby() -> (u32, u32) {
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let input = &load_string("inputs/2025/day1.input");
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//let input = TEST_INPUT;
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let mut current_rotation = START;
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let mut result_part1: u32 = 0;
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let mut result_part2: u32 = 0;
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for roation in parse(input).iter() {
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match roation {
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Rotation::Left(amount) => {
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// overflows to the left
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let new = (current_rotation as i32) - *amount as i32;
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current_rotation = new.rem_euclid(100) as u32;
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result_part2 += ((new.abs() + if new < 0 {100} else {0}) / 100) as u32;
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},
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Rotation::Right(amount) => {
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// overflows to the right
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let new = (current_rotation as i32) + *amount as i32;
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current_rotation = new.rem_euclid(100) as u32;
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result_part2 += (new / 100) as u32;
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},
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}
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if current_rotation == 0 {
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result_part1 += 1;
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}
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}
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(result_part1, result_part2)
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}
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pub fn part1() -> u32 {
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gaby().0
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}
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pub fn part2() -> u32 {
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gaby().1
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}
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