不可爱的小可爱:
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C - The Intriguing Obsession /* Codeforces Round #439 */ (dp ) D - Almost Identity Permutations /* Codeforces Round 888 D */ 线段树模板 B - Oulipo HDU-1686 D - Cyclic Nacklace HDU-3746 C - 剪花布条 HDU-2087 E - Period HDU-1358 A - Number Sequence HDU-1711 素数相关 欧拉函数
C - The Intriguing Obsession /* Codeforces Round #439 */ (dp )
D - Almost Identity Permutations /* Codeforces Round 888 D */
线段树模板
B - Oulipo HDU-1686
D - Cyclic Nacklace HDU-3746
C - 剪花布条 HDU-2087
E - Period HDU-1358
A - Number Sequence HDU-1711
素数相关
欧拉函数