In the submission, the sample 8 ms submission is as follows:

```
class Solution {
public boolean repeatedSubstringPattern(String s) {
if (s == null || s.length() <= 1) return false;
int len = s.length(), mid = len >>> 1;//一半
if (s.substring(0, mid).equals(s.substring(mid))) return true;
int one_third = len/3;//三分之一
String sub = s.substring(0, one_third);
if (sub.equals(s.substring(one_third, one_third * 2))
&& sub.equals(s.substring(one_third * 2))) return true;
if (len % 2 == 1) {//奇数个字符
char c = s.charAt(0);
for (int i = 1; i < len; i ++) {
if (s.charAt(i) != c) return false;
}
return true;
}
return false;
}
}
```

while it fails with test case "abcabcabcabcabc". Where should I report these cheated submissions? Thanks for letting me know.