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Educational Codeforces Round 2_B. Queries about less or equal elements

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A. Vasya and Football

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Codeforces Round #332 (Div. 2)_B. Spongebob and Joke

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Codeforces Round #280 (Div. 2)_C. Vanya and Exams

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DFS入门__poj1979

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Codeforces Round #331 (Div. 2) _A. Wilbur and Swimming Pool

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HDU_5563Clarke and five-pointed star

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克鲁斯卡尔(Kruskal)算法求最小生成树

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B. OR in Matrix

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