Sympy

A grade

{ 2 }

B grade

{ 3, 4 }

C grade

{ 13, 14, 15, 16 }

F normal fail

{ 1, 5, 6, 8, 9, 10, 11, 12, 17, 18, 19, 20 }

F(-1) timedout fail

{ 7 }

F(-2) exception fail

{ }