#include<bits/stdc++.h>
using namespace std;
#define ll long long
int main(){
    ll t;
    cin >> t;
    while(t--){
        ll n;
        cin >> n;
        string s1,s2;
        cin >> s1 >> s2;
        ll cnt1 = count(s1.begin(),s1.end(),'1');
        ll cnt2 = count(s2.begin(),s2.end(),'1');
        if(cnt1>=1 && cnt2==0){
            cout << "NO\n";
        }else if(cnt2==n && cnt1!=n){
            cout << "NO\n";
        }else{
            cout << "YES\n";
        }
    }
}