Solve 2025 day 1 part 1 in rust

2025/inputs/01.txt

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+L68
+L30
+R48
+L5
+R60
+L55
+L1
+L99
+R14
+L82

2025/rust/.envrc

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+use flake .#rust

2025/rust/day-01/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "day-01"
+version = "0.1.0"

2025/rust/day-01/Cargo.toml

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+[package]
+name = "day-01"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

2025/rust/day-01/src/main.rs

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+use std::fs::{self};
+
+fn main() {
+    let rotations = read_input();
+
+    println!("Password: {}", count_neutral_positions(rotations));
+}
+
+fn read_input() -> 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 * -1,
+            "R" => distance,
+            _ => panic!(),
+        };
+
+        rotations.push(rotation);
+    }
+
+    rotations
+}
+
+fn count_neutral_positions(rotations: Vec<i32>) -> i32 {
+    let mut counter = 0;
+    let mut position = 50;
+
+    for rotation in rotations {
+        position = (position + rotation) % 100;
+
+        if position == 0 {
+            counter += 1;
+        }
+    }
+
+    counter
+}