A14667 | $Square String?$

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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.

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.

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).

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

C++ 编辑器

输入

输出