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Codeforces Round #346 (Div. 2) E. New Reform dfs
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Codeforces Round #346 (Div. 2) D. Bicycle Race 叉积
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Codeforces Round #346 (Div. 2) F. Polycarp and Hay 并查集 bfs
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April Fools Day Contest 2016 B. Scrambled
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