1 awice 19 0:07:59 0:03:06 0:03:15 0:04:54 0:07:59

The above line is copied from the latest contest ranking, and that guy appears to solve the Q2 in just 9 seconds!
I can't even complete reading the description that fast. Can someone help me understand how it''s achievable?
Am I too dumb or they are just too smart?