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

#ifdef LOCAL
#include "debug.h"
#else
#define dbg(...)
#endif

void solve() {    
    int n;
	string s,p;
    cin >> n >> s >> p;
	
	if(n==1){
		cout << (s != p ? "NO" : "YES" ) << endl;
		return;
	}
    int s_one = count(s.begin(),s.end(),'1');
	int s_zero = count(s.begin(),s.end(),'0');
	
	int p_one = count(p.begin(),p.end(),'1');
	int p_zero = count(p.begin(),p.end(),'0');
	
	if(s_one== n && p_zero == n){
		cout << "NO" << endl;
	}
	else if(s_zero== n && p_one == n){
		cout << "NO" << endl;
	}
	
	else cout << "YES" << endl;

}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);

    int t; cin >> t;while (t--)
    solve();
    return 0;
}