ICode9

 链接：https://ac.nowcoder.com/acm/contest/27589/B来源：牛客网 题目描述 设 s,ts,ts,t 为两个字符串，定义 f(s,t)=tf(s,t) = tf(s,t)=t 的子串中，与 sss 相等的串的个数。如 f("ac","acacac")=3f("ac","acacac")=3f("ac","