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A grade
{ }
B grade
{ 21 }
C grade
F normal fail
F(-1) timedout fail
{ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22, 23, 24, 25, 26, 27, 28, 31, 32, 33 }
F(-2) exception fail
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