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【例2】直接插人排序的最坏情况是初始序列为( )序;shell排序的最坏情况是初始序列为( )序;直接插入排序的最好情况是初始序列为( )序;快速排序的最坏情况是初始序列为()序时,其时间复杂度为O(n2)。A.正B.反 C.正和反 D.无

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