A14667. Square String?
编程题
普及/提高-
知识点
题目描述
A string is called square if it is some string written twice in a row. For example, the strings "aa", "abcabc", "abab" and "baabaa" are square. But the strings "aaa", "abaaab" and "abcdabc" are not square.
For a given string $s$ determine if it is square.
For a given string $s$ determine if it is square.
输入格式
The first line of input data contains an integer $t$ ( $1 \le t \le 100$ ) —the number of test cases.
This is followed by $t$ lines, each containing a description of one test case. The given strings consist only of lowercase Latin letters and have lengths between $1$ and $100$ inclusive.
This is followed by $t$ lines, each containing a description of one test case. The given strings consist only of lowercase Latin letters and have lengths between $1$ and $100$ inclusive.
输出格式
For each test case, output on a separate line:
- YES if the string in the corresponding test case is square,
- NO otherwise.
You can output YES and NO in any case (for example, strings yEs, yes, Yes and YES will be recognized as a positive response).
- YES if the string in the corresponding test case is square,
- NO otherwise.
You can output YES and NO in any case (for example, strings yEs, yes, Yes and YES will be recognized as a positive response).
输入输出样例
输入 #1
10 a aa aaa aaaa abab abcabc abacaba xxyy xyyx xyxy
输出 #1
NO YES NO YES YES YES NO NO NO YES