Codeforces Round #784 (Div. 4) 1669D - Colorful Stamp Solution

Problem  link:  https://codeforces.com/contest/1669/problem/D

Solution in C++: 

 ///La ilaha illellahu muhammadur rasulullah

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

///Abul Hasnat  Tonmoy

///Department of CSE,23rd batch

///Islamic University,Bangladesh

///**********ALLAH IS ALMIGHTY************///

#include <bits/stdc++.h>

using namespace std;

int main()

{

    int  n,b,r,ans,i,j,t;

    cin>>t;

    while(t--)

    {

        string s;

        ans=b=r=0;

        cin>>n>>s;

        for(i=0; i<n; i++)

        {

            if(s[i]!='W')

            {

                b=r=0;

                while((n>i)&&(s[i]!='W'))

                {

                    if(s[i]=='B')

                        b++;

                    else

                        r++;

                    i++;

                }

                if(b==0||r==0)

                {

                    ans=1;

                    break;

                }

            }

        }

        if(ans==1)

            cout<<"NO"<<endl;

        else

            cout<<"YES"<<endl;

    }

}