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

int32_t main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    #ifdef SUBLIME
        freopen("inputf.in", "r", stdin);
        freopen("outputf.out", "w", stdout);
        freopen("error.txt", "w", stderr);
    #endif

    int tt;
    cin >> tt;
    while (tt--) {
        int n;
        string s, p;
        cin >> n >> s >> p;
        
        int cnt = count(p.begin(), p.end(), '0');
        if ((cnt == 0 || cnt == n) && (s != p)) cout << "NO\n";
        else cout << "YES\n";
    }
    return 0;
}