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Codeforces 963 A. Alternating Sum (逆元)
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Codeforces 845 D. Driving Test (模拟)
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Codeforces 920 E. Connected Components? (bfs)
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HDU 3826 Squarefree number (素数)
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Codeforces 861 D. Polycarp's phone book (trie)
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