day1 part1

.gitignore

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+/target

Cargo.lock

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+# It is not intended for manual editing.
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Cargo.toml

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+[package]
+name = "advent-of-code-2025"
+version = "0.1.0"
+authors = ["Jan Doumont <jan@6a616e.net>"]
+edition = "2024"
+
+[dependencies]
+aoc-runner = "0.3.0"
+aoc-runner-derive = "0.3.0"

src/day1.rs

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+#[aoc(day1, part1)]
+pub fn part1(input: &str) -> i32 {
+    let mut dial_counter = DialCounter {
+        position: 50,
+        zero_count: 0,
+    };
+    for line in input.lines() {
+        dial_counter.rotate(line)
+    }
+    dial_counter.zero_count
+}
+
+struct DialCounter {
+    position: i32,
+    zero_count: i32,
+}
+
+impl DialCounter {
+    fn rotate(&mut self, operation: &str) {
+        self.position = match operation.chars().nth(0).unwrap() {
+            'L' => (self.position - operation[1..].parse::<i32>().unwrap()) % 100,
+            'R' => (self.position + operation[1..].parse::<i32>().unwrap()) % 100,
+            _ => panic!("Unexpected input!"),
+        };
+        if self.position == 0 {
+            self.zero_count = self.zero_count + 1;
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {}

src/lib.rs

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+extern crate aoc_runner;
+
+#[macro_use]
+extern crate aoc_runner_derive;
+
+pub mod day1;
+
+aoc_lib! { year = 2025 }

src/main.rs

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+extern crate  advent_of_code_2025;
+extern crate aoc_runner_derive;
+extern crate aoc_runner;
+
+
+use aoc_runner_derive::aoc_main;
+
+
+aoc_main! { lib = advent_of_code_2025 }