Maxima

A grade

{ 2, 4, 5, 6, 7, 9, 11, 12, 13, 14, 15, 16, 17, 18 }

B grade

{ 1, 3, 8, 10 }

C grade

{ }

F normal fail

{ }

F(-1) timedout fail

{ }

F(-2) exception fail

{ 19, 20, 21, 22, 23 }