ABC145B - Echo

問題：B - Echo

#include <iostream>
#include <string>
using namespace std;

int main(void) {
    int n;
    string s;

    cin.tie(0);
    ios::sync_with_stdio(false);
    cin >> n;
    cin >> s;
    cout << (n % 2 == 0 && s.substr(0, n / 2) == s.substr(n / 2, n)? "Yes" : "No") << "\n";
    return 0;
}