Unable to find the mistake please help!

1 
using namespace std;
int main()
{
  string s;
  long long int a=0,b=0,t=0;
 
  cin>>s;
  if(s.length()<4)
  {
    cout<<"NO";
    return 0;
  }
  else
  {
    for(int i=0;i<s.length();i++)
    {
      if(s[i]=='A'&&s[i+1]=='B'&&a==0)
      {
        a=1;
        t=i+1;
        break;
      }
      
    }
    for(int i=0;i<s.length();i++)
    {
        if(s[i]=='B'&&s[i+1]=='A'&&a==1&&i!=t||i!=t+1)
      {
        b=1;
        break;
      }
    }
 
    if(a==1&&b==1)
    {
      cout<<"YES";
      return 0;
    }
    else
    {
      cout<<"NO";
      return 0;
    }
  }
}```

I am getting the wrong answer in test case 8 and IDK why pls help!
2

I think your code might fail on this -
ABAAB
Your code ignores the second AB and takes into consideration of the first one. Because of this, non-overlapping BA could not be found.

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