Maple

A grade

{ 4, 9, 13, 17 }

B grade

{ 5, 18 }

C grade

{ 1, 2, 3, 6, 7, 8, 10, 11, 12, 14, 15, 16 }

F normal fail

{ 20, 21, 22 }

F(-1) timedout fail

{ }

F(-2) exception fail

{ }