求调

#include<bits/stdc++.h>
using namespace std;
int n;
string s; 
int main(){
    cin>>n>>s;
    if(n==2&&s[0]==s[1]){cout<<"Yes";return 0;}
    for(int i=1;i+i<n;i++){
    	string t="";
    	for(int j=0;j<i;j++)t+=s[j];
    	bool f=1;
    	for(int j=0;j<n;j+=i){
    		string xs="";
    		for(int k=j;k<j+i;k++)xs+=s[k];
    		//cout<<'['<<t<<' '<<xs<<']';
    		if(t!=xs){f=0;break;}
		}
		if(f){cout<<"Yes";return 0;}
	}
	cout<<"No";
}
// 0 1 2 3 4 5 
// a b a b a b