2025(02): solve part 1

2025/02/part1.py

@@ -0,0 +1,20 @@
+with open("input", "r") as fp:
+	rangestrs = fp.read().split(",")
+	ranges = []
+	for rangestr in rangestrs:
+		a, b = rangestr.split("-")
+		a_int, b_int = int(a), int(b)
+		ranges.append((a, b))
+		assert a_int < b_int, f"Range invalid: {a} is not smaller than {b}"
+
+	illegal_counter = 0
+	illegal_sum = 0
+	for a, b in ranges:
+		a_int, b_int = int(a), int(b)
+		for num in range(a_int, b_int + 1):
+			num_str = str(num)
+			if len(num_str) % 2 == 0 and num_str[len(num_str) // 2:] == num_str[:len(num_str) // 2]:
+				illegal_counter += 1
+				illegal_sum += num
+
+	print(illegal_counter, illegal_sum)

2025/02/testinput

@@ -0,0 +1 @@
+11-22,95-115,998-1012,1188511880-1188511890,222220-222224,1698522-1698528,446443-446449,38593856-38593862,565653-565659,824824821-824824827,2121212118-2121212124