day 03

Author: Liedtke

day03.py

@@ -0,0 +1,18 @@
+import re
+regex_mul = re.compile(r"mul\(([0-9]+),([0-9]+)\)")
+input = open("inputs/day03.txt").read()
+print(f"part 1 = {sum(int(match[0]) * int(match[1]) for match in regex_mul.findall(input))}")
+
+regex_op = re.compile(r"(mul|do|don't)\((([0-9]+),([0-9]+))?\)")
+enabled = True
+result = 0
+for op, _, a, b in regex_op.findall(input):
+    if op == "do":
+        enabled = True
+    elif op == "don't":
+        enabled = False
+    else:
+        assert op == "mul"
+        if enabled:
+            result += int(a) * int(b)
+print(f"part 2 = {result}")