#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int main()
{
    //freopen("input.txt","r", stdin);
    int t;
    cin >> t;
    while (t--){
       ll n, u =0,p = 0;
       cin >> n;
       string s, v;
       cin >> s >>v;
       for ( int i = 0; i < n;i++){
          if ( s[i] == '1') u++;
       }

       for ( int i = 0; i < n;i++){
          if ( v[i] == '1') p++;
       }
       if ( s == v){ cout <<"YES" << endl; continue;}

       if ( p ==n || p == 0) cout <<"NO" << endl; else cout <<"YES" << endl;


    }
    return 0;
}