LeetCode : 459. Repeated Substring Pattern

[congr]

https://leetcode.com/problems/repeated-substring-pattern/

[congr]

class Solution {
    public boolean repeatedSubstringPattern(String s) {
        // if (s.length() % 2 == 1) return false; // abaabaaba len :9

        String t = s + s;
        return t.substring(1, t.length()-1).contains(s);
    }
}