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Sum of Square Numbers (四平方数和定理)

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Entropy

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AtCoder Caddi 2018 E. Negative Doubling (Stack)

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Codeforces 962F. Simple Cycles Edges (BCC)

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Codeforces 1009F. Dominant Indices (DSU on Tree)

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Codeforces 990F. Flow Control (Tree + DP)

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Codeforces 985F. Isomorphic Strings (String + Hash)

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Codeforces 1051F. The Shortest Statement (Shortest Path + LCA)

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Codeforces 1065F. Up and Down the Tree (DP + Tree + Greedy)

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Codeforces 1093F. Vasya and Array (DP)

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Codeforces 1093E. Intersection of Permutations (Divide and Conquer + Fenwick Tree)

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Codeforces 1093G. Multidimensional Queries (Manhattan Distance + Segment Tree)

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Codeforces 1083E. The Fair Nut and Rectangles (DP+Convex-Hull Trick)

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Luogu P1251. 餐巾计划问题 (Mincost Flow)

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Partial Order Problem (Divide and Conquer)

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Codeforces 1082G. Petya and Graph (Mincut)

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AtCoder Dwango Programming Contest V E.Cyclic GCD (DP+Polynomials)

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Codeforces 1062E. Company (LCA+RMQ)

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Range Query Problems, Mo's Algorithm and Rollback Square Root Decomposition

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Codeforces 1078C. Vasya and Maximum Matching (Tree+DP)

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