getting minimum character to be added at front to make string palindrome.txt

#include<bits/stdc++.h>
using namespace std;

bool ispalindrome(string s)
{
int l = s.length();
int j;
for(int i=0;j=l-1;i<=j;i++,j--)
{
	if(s[i] != s[j])
	return false;
}
return true;
}

int main()
{
string s = "BABABAA";
int cnt=0;
int flag = 0;

while(s.length()>0)
{
if(ispalindrome(s))
{
flag = 1;
break;
}
else
{
cnt++;
s.erase(s.begin()+s.length()-1);
}
}
if(flag)
cout<<cnt;
}