Maple

A grade

{ 1, 2, 3, 4, 5, 6, 8, 10, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23 }

B grade

{ 7, 9, 11 }

C grade

{ }

F normal fail

{ }

F(-1) timedout fail

{ }

F(-2) exception fail

{ }