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线段数 [crayon-67f16bfd710f2550533240/] 树状数组 [crayon-67f16bfd710f7767226772/] 洛谷P1972 [SDOI2009]HH的项链---树状数组 [crayon-67f16bfd710f9081971051/]

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A.permutation [crayon-67f16bfd71a43471945402/] B.Deque [crayon-67f16bfd71a47332900997/] C.Book [crayon-67f16bfd71a49862797098/] D.lines [crayon-67f16bfd71a4b69254349…

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