Day 13 (part 2 v2)

day13/part2-v2-minified.py

@@ -0,0 +1,2 @@
+t,s=0,1;w=lambda t:w(t+s)if(t+o)%b else 0
+for o,b in ((i,int(b))for i,b in enumerate(open("input.txt").readlines()[1].split(','))if b!='x'):t,s=w(t),s*b;print(t)

day13/part2-v2.py

@@ -0,0 +1,10 @@
+buses = open("input.txt").readlines()[1]
+buses = ((index, int(bus)) for index, bus in enumerate(buses.split(',')) if bus != 'x')
+
+step, time = 1, 0
+for offset, bus in buses:
+    while (time + offset) % bus:
+        time += step
+    step *= bus
+
+print(time)