Sympy

A grade

{ 7 }

B grade

{ 2, 3, 4, 5, 6, 8, 16 }

C grade

{ }

F normal fail

{ 9, 10, 11, 12, 13, 17 }

F(-1) timedout fail

{ 1, 14, 15, 18, 19 }

F(-2) exception fail

{ }