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Codeforeces Round #226 (Div. 2) E---Bear in the Field(矩阵快速幂)
Our bear's forest has a checkered field. The...
Codeforces Round #291 (Div. 2) E. Darth Vader and Tree(矩阵优化DP)
题意：给你一颗树，有无限个节点，每个节点有n个儿子...