#include<bits/stdc++.h>
using namespace std;
#define ll long long
int main()
{
    ll t ;
    cin>>t;
    while(t--){
       ll n;
       cin>>n;
       string s1, s2;
       cin>>s1>>s2;
       ll cnt=0;
        for(ll i=0 ; i<s2.size() ; i++){
            if(s2[i]=='0'&&s2[i+1]=='0'){
                cnt=1;
                break;
            }
        }
        if(n==1){
            if(s1!=s2)
                cout<<"NO"<<endl;
            else
                cout<<"YES"<<endl;
        }
        else if(cnt==1)
            cout<<"NO"<<endl;
        else
            cout<<"YES"<<endl;
    }

}