#include<bits/stdc++.h>
using namespace std;

/*
 * @author abhishek
 *
*/

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);

    int tt;
    cin>>tt;
    while(tt--) {
        int n;
        cin>>n;
        string s, p;
        cin>>s>>p;

        if(s==p) {
            cout<<"YES"<<endl;
            continue;
        }
        if(n==1) {
            cout<<"NO"<<endl;
            continue;
        }

        bool one = true;
        bool zero= true;

        for(auto it:p) {
            if(it=='1') {
                zero= false;
            }
            if(it=='0') {
                one= false;
            }
        }

        if(one ||zero) {
            if(s==p) {
                cout<<"YES"<<endl;
            } else{
                cout<<"NO"<<endl;
            }
        } else{
            cout<<"YES"<<endl;
        }
    

    }
    return 0;
}