Codeforces Round #769 (Div. 2) 1632A - ABC Solution

 Solution in C++: 

///La ilaha illellahu muhammadur rasulullah

///******Bismillahir-Rahmanir-Rahim******///

///Abul Hasnat  Tonmoy

///Department of CSE,23rd batch

///Islamic University,Bangladesh

#include <bits/stdc++.h>

using namespace std;

int main()

{

    ios::sync_with_stdio(false);

    cin.tie(0);

    int t,n,i,l;

    cin>>t;

    while(t--)

    {

        cin>>l;

        string s;

        cin>>s;

        if(l==1)

            cout<<"YES"<<endl;

        else if((s=="00")||(s=="11"))

            cout<<"NO"<<endl;

        else if(l>=3)

            cout<<"NO"<<endl;

        else

            cout<<"YES"<<endl;

    }

    return 0;

}