Day 13 (reduce)

day13/part2.py

@@ -1,3 +1,4 @@
+from functools import reduce
 from math import gcd
 
 
@@ -20,9 +21,5 @@ def merge(a, b, x, y):
 
 lines = [x.strip() for x in open("input.txt")]
 busses = ((int(x), -idx) for idx, x in enumerate(lines[1].split(',')) if x != 'x')
-
-current = (1, 0)
-for bus in busses:
-    current = merge(*current, *bus)
-
-print(current[1])
+sequence = reduce(lambda fn, fm: merge(*fn, *fm), busses, (1, 0))
+print(sequence[1])