ASC47B borderless

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题目描述 border集合为{NULL,str}的串str称为borderless串. border即KMP里的那个. 字符集{'a','b'},给定长度n,求第k(给定)小的borderless串. 题解按位确定,这时我们需要计算对于一个给定的前缀,以它为前缀的长k的borderless串个数. borderless串个数并不好求,我们考虑求有border的串个数,再容斥掉. 考虑前缀为t的长度为j的有border串个数为ex,长度为j的borderless串个数为2^(j-min(j,t)…

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