#include <bits/stdc++.h>
using namespace std;
#define debug(a) cerr << #a << " = " << (a) << nl;
#define ll long long
#define int long long
#define nl '\n'

void jAVA()
{
    int n; string s, t; cin >> n >> s >> t;
    int zs = count(s.begin(), s.end(), '0');
    int os = count(s.begin(), s.end(), '1');
    int zt = count(t.begin(), t.end(), '0');
    int ot = count(t.begin(), t.end(), '1');
    if(s == t) cout << "YES\n";
    else if(!zt or !ot) cout << "NO\n";
    else cout << "YES\n";
}

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

    int t = 1, cs = 0;
    cin >> t;
    while (t--){
        // cout << "Case " << ++cs << ": ";
        jAVA();
    }
    return 0;
}