Reduce

A grade

{ }

B grade

{ 3, 4, 15, 16, 28 }

C grade

{ }

F normal fail

{ 1, 2, 5, 6, 7, 8, 9, 10, 13, 14, 19, 20, 21, 22, 25, 26, 27, 29, 30 }

F(-1) timedout fail

{ }

F(-2) exception fail

{ }