feat(01/2015): solve first part

Author: manhunto

readme.md

@@ -83,5 +83,12 @@
 | [Day 24: Never Tell Me The Odds](src/solutions/year2023/day24.rs)         |   ⭐    |            2.406 |                - |
 | [Day 25: Snowverload](src/solutions/year2023/day25.rs)                    |        |                - |                - |
 
+# 2015
+
+| Day                                                      | Solved | Part 1 time (ms) | Part 2 time (ms) |
+|----------------------------------------------------------|:------:|-----------------:|-----------------:|
+| [Day 1: Not Quite Lisp](src/solutions/year2015/day01.rs) |   ⭐    |            0.013 |                - |
+
 # TODO
+
 - if result for given day was invalid, save it in cache and avoid sending again

src/solutions/year2015/day01.rs

@@ -3,8 +3,16 @@ use crate::solutions::Solution;
 pub struct Day01;
 
 impl Solution for Day01 {
-    fn part_one(&self, _input: &str) -> String {
-        String::from("0")
+    fn part_one(&self, input: &str) -> String {
+        input
+            .bytes()
+            .map(|b| match b {
+                b'(' => 1,
+                b')' => -1,
+                _ => 0,
+            })
+            .sum::<isize>()
+            .to_string()
     }
 
     fn part_two(&self, _input: &str) -> String {
@@ -14,13 +22,18 @@ impl Solution for Day01 {
 
 #[cfg(test)]
 mod tests {
-    use crate::solutions::year2024::day01::Day01;
-    use crate::solutions::Solution;
-
-    const EXAMPLE: &str = r#""#;
+    use super::*;
 
     #[test]
     fn part_one_example_test() {
-        assert_eq!("0", Day01.part_one(EXAMPLE));
+        assert_eq!("0", Day01.part_one("(())"));
+        assert_eq!("0", Day01.part_one("()()"));
+        assert_eq!("3", Day01.part_one("((("));
+        assert_eq!("3", Day01.part_one("(()(()("));
+        assert_eq!("3", Day01.part_one("))((((("));
+        assert_eq!("-1", Day01.part_one("())"));
+        assert_eq!("-1", Day01.part_one("))("));
+        assert_eq!("-3", Day01.part_one(")))"));
+        assert_eq!("-3", Day01.part_one(")())())"));
     }
 }