Day 13, part 1

2020/13/main.py

@@ -0,0 +1,23 @@
+test = (
+	939,
+	"7,13,x,x,59,x,31,19",
+)
+
+data = (
+	1002462,
+	"37,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,41,x,x,x,x,x,x,x,x,x,601,x,x,x,x,x,x,x,x,x,x,x,19,x,x,x,x,17,x,x,x,x,x,23,x,x,x,x,x,29,x,443,x,x,x,x,x,x,x,x,x,x,x,x,13",
+)
+
+
+def part_1(departure, bus_ids):
+	buses = [int(x) for x in bus_ids.split(",") if x != "x"]
+	distances = [(departure // x + 1) * x - departure for x in buses]
+	idx = distances.index(min(distances))
+	return buses[idx], distances[idx]
+
+
+id, wait = part_1(*test)
+assert id*wait == 295
+
+id, wait = part_1(*data)
+print(f"1: Answer is {id*wait}")