From c0a5c2165dc1d396d978bc21a352bd64226bcb7a Mon Sep 17 00:00:00 2001
From: Bruno BELANYI <bruno@belanyi.fr>
Date: Tue, 3 Dec 2024 10:12:55 +0000
Subject: [PATCH] 2024: d03: ex1: add solution

---
 2024/d03/ex1/ex1.py | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100755 2024/d03/ex1/ex1.py

diff --git a/2024/d03/ex1/ex1.py b/2024/d03/ex1/ex1.py
new file mode 100755
index 0000000..1981c7b
--- /dev/null
+++ b/2024/d03/ex1/ex1.py
@@ -0,0 +1,36 @@
+#!/usr/bin/env python
+
+import sys
+import re
+import dataclasses
+
+
+@dataclasses.dataclass
+class MulInstruction:
+    lhs: int
+    rhs: int
+
+    def calc(self) -> int:
+        return self.lhs * self.rhs
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> list[MulInstruction]:
+        res: list[MulInstruction] = []
+
+        MUL_REGEX = re.compile(r"mul\((\d+),(\d+)\)")
+        for match in MUL_REGEX.finditer(input):
+            res.append(MulInstruction(int(match.group(1)), int(match.group(2))))
+
+        return res
+
+    return sum(inst.calc() for inst in parse(input))
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()