相关链接
题目传送门：http://www.lydsy.com/JudgeOnline/problem.php?id=4556
神犇题解：http://www.cnblogs.com/Var123/p/5575518.html
解题报告
这个题目实际上是询问 $s(c,d)$ 的 $LCP$
于是我们考虑二分这个长度 $L$
那么这个 $L$ 就相当于在 $SA$ 的数组上划了一个区间
不难发现如果这个区间中存在一个后缀的起点属于 $s(a,b)$ ，这个长度就是合法的
于是我们二分一下，然后搞一个后缀数组和函数式线段树就可以啦！
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