样例都没过就A了，我也不知道错哪了，大佬们帮忙看看吧

#include <iostream>
#include <cstring>

using namespace std;

string s;

bool ck(int S, int ed)
{
	for (int i = S, j = ed; i <= ed && j >= S; i ++ , j -- ) if (s[i] != s[j]) return 0;
	return 1;
}

int main()
{
	cin >> s;
	int n = s.size();
	s = ' ' + s;
	int i = 1, len = 1;
	int ans = 0;
	while (i + len - 1 <= n)
	{
		//cout << i << " " << len << endl;
		if (ck(i, i + len - 1)) ans ++ ;
		i += len, len ++ ;
	}
	if (i < n && ck(i, n)) ans ++ ;
	cout << ans << endl;
	return 0;
}