SebastianStork/advent-of-code
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Improve 2025 day 1 in rust

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SebastianStork 2025-12-01 16:16:28 +01:00
parent e2af8dddbe
commit 99554bc83b
Signed by: SebastianStork
SSH key fingerprint: SHA256:iEM011ogNMG1q8+U500adGu/9rpPuZ2KnFtbdLeqTiI
1 changed files with 22 additions and 27 deletions
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49
2025/rust/day-01/src/main.rs
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@ -1,5 +1,8 @@
use std::fs::{self};
const STARTING_POSITION: i32 = 50;
const DIAL_RANGE: i32 = 100;
fn main() {
let rotations = read_rotations();
@ -8,34 +11,26 @@ fn main() {
}
fn read_rotations() -> Vec<i32> {
let contents = fs::read_to_string("../../inputs/01.txt").unwrap();
let lines = contents.lines();
let mut rotations = vec![];
for line in lines {
let (direction, distance) = line.split_at(1);
let distance = distance.parse::<i32>().unwrap();
let rotation = match direction {
"L" => -distance,
"R" => distance,
_ => panic!(),
};
rotations.push(rotation);
fs::read_to_string("../../inputs/01.txt")
.unwrap()
.lines()
.map(|line| {
let distance = line[1..].parse::<i32>().unwrap();
if line.starts_with('L') {
-distance
} else {
distance
}
})
.collect()
}
rotations
}
fn count_zero_positions(rotations: &Vec<i32>) -> i32 {
fn count_zero_positions(rotations: &[i32]) -> i32 {
let mut counter = 0;
let mut position = 50;
let mut position = STARTING_POSITION;
for rotation in rotations {
position = (position + rotation).rem_euclid(100);
position = (position + rotation).rem_euclid(DIAL_RANGE);
if position == 0 {
counter += 1;
@ -45,14 +40,14 @@ fn count_zero_positions(rotations: &Vec<i32>) -> i32 {
counter
}
fn count_zero_clicks(rotations: &Vec<i32>) -> i32 {
fn count_zero_clicks(rotations: &[i32]) -> i32 {
let mut counter = 0;
let mut position = 50;
let mut position = STARTING_POSITION;
for rotation in rotations {
position += rotation;
counter += (position / 100).abs();
counter += (position / DIAL_RANGE).abs();
if position < 0 && position != *rotation {
counter += 1;
}
@ -60,7 +55,7 @@ fn count_zero_clicks(rotations: &Vec<i32>) -> i32 {
counter += 1;
}
position = position.rem_euclid(100);
position = position.rem_euclid(DIAL_RANGE);
}
counter