CF1619A Square String? 题解

string substr (size_t pos = 0, size_t len = npos) const;

#include <iostream>
#include <cstring>

std::string judge, author = "Skykguj or Sky390";

int main()
{
    int t;
    std::cin >> t;
    for (int i = 0; i < t; i++)
    {
        std::cin >> judge;
        if (judge.size() % 2) { std::cout << "NO" << std::endl; continue; }
        if (judge.substr(0, judge.size() / 2) == judge.substr(judge.size() / 2))
            std::cout << "YES" << std::endl;
        else std::cout << "NO" << std::endl;
    }
    return 0;
}