#include<bits/stdc++.h>
#define ll long long
#define cy cout<<"YES"<<endl
#define cn cout<<"NO"<<endl
#define srt sort(v.begin(),v.end())
#define pb push_back
using namespace std;

void rs(){
    int n;
    cin>>n;

    string s,s1;
    cin>>s>>s1;

    if(n==1){
        if(s==s1) cy;
        else cn;
        return;
    }
    bool f=false;
    bool f1=false;

    for(char c:s1){
        if(c=='0'){
            f=true;
        }
        if(c=='1'){
            f1=true;
        }
    }

    if(f && f1)cy;
    else{
        if(s==s1) cy;
        else cn;
    }
}

int main(){
    int t;
    cin>>t;

    while(t--){
        rs();
    }
    return 0;
}