## 459. Repeated Substring Pattern

Given a non-empty string check if it can be constructed by taking a substring of it and appending multiple copies of the substring together. You may assume the given string consists of lowercase English letters only and its length will not exceed 10000.

Example 1:

```Input: "abab"
Output: True
Explanation: It's the substring "ab" twice.
```

Example 2:

```Input: "aba"
Output: False
```

Example 3:

```Input: "abcabcabcabc"
Output: True
Explanation: It's the substring "abc" four times. (And the substring "abcabc" twice.)
```

## Rust Solution

``````struct Solution;

impl Solution {
fn repeated_substring_pattern(s: String) -> bool {
let mut t: String = "".to_string();
let n = s.len();
if n < 2 {
return false;
}
t += &s;
t += &s;
t[1..2 * n - 1].contains(&s)
}
}

#[test]
fn test() {
let s = "abab".to_string();
assert_eq!(Solution::repeated_substring_pattern(s), true);
let s = "aba".to_string();
assert_eq!(Solution::repeated_substring_pattern(s), false);
let s = "abcabcabcabc".to_string();
assert_eq!(Solution::repeated_substring_pattern(s), true);
}
``````

Having problems with this solution? Click here to submit an issue on github.