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BZOJ 2301 [HAOI2011]Problem b (莫比乌斯反演)
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51nod 1239 欧拉函数之和
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HDU 6055 Regular polygon (找正方形)
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HDU 6050 Funny Function (规律+逆元)
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SPOJ SUBST1 - New Distinct Substrings (后缀数组)
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Codeforces 851 D. Arpa and a list of numbers(技巧)
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Codeforces 849 C. From Y to Y (技巧)
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51nod 1109 01组成的N的倍数 (bfs)
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Codeforces 842 D. Vitya and Strange Lesson (trie)
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Codeforces 842 C. Ilya And The Tree (dfs)
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