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A grade
{ 9, 10, 11 }
B grade
{ 3, 12 }
C grade
{ }
F normal fail
{ 4, 5, 8, 18, 19, 20 }
F(-1) timedout fail
{ 1, 2, 6, 7, 13, 14, 15, 16, 17 }
F(-2) exception fail
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