单项选择题
A.log2n B.n2 C.O(n1.5) D.n(n-1)/2
A.GEDHFBCA B.DGEBHFCA C.ABCDEFGH D.ACBFEDHG
A.n-1 B.n(n-1) C.n D.n+1
A.12 B.13 C.14 D.15
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