550A Codeforces - Two Substrings

550A Codeforces - Two Substrings

Link : http://codeforces.com/problemset/problem/550/A

Solution in C++

#include <bits/stdc++.h>

using namespace std;

int n,sol,AB,BA,ABA,flag=-1;

string inp;

int main() {

    ios::sync_with_stdio(0);

    cin.tie(0);cout.tie(0);

    cin>>inp;

    n=inp.size();

    for(int i=1;i<n;i++)

    {

        if(inp[i]=='A' && inp[i-1]=='B')

        {

            BA++;

            if(flag==i-1)ABA++,i++;

            flag=i;

        }

        else if(inp[i]=='B' && inp[i-1]=='A')

        {

            AB++;

            if(flag==i-1)ABA++,i++;

            flag=i;

        }

    }

    AB-=ABA;

    BA-=ABA;

    if(ABA>1 || (AB && ABA) || (BA && ABA) || (AB && BA)) cout<<"YES\n";

    else cout<<"NO";

    return 0;

}

Share on Google Plus

About Mohamed Sobhi

My name is Mo.Sobhy ,I study at School excelling high school in Ain Shams ,Cairo
My hobbies is programming ,and web development ,playing chess and writing horror stories.