121. Repeated Substring Pattern
EasyString
Print YES if s can be built by repeating one of its substrings two or more times, else NO.
Input format
A single line.
Output format
YES or NO
Example 1
Input
abab
Output
YES
Example 2
Input
aba
Output
NO
Constraints
1 ≤ |s| ≤ 10⁴
Read input from standard input and print the answer to standard output. Your code is judged against 5 test cases, most of them hidden.
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