#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>

using namespace std ;


bool isPerfectSquare( const int& num )
{
   if (num < 0) {
        return false; // Negative numbers cannot be perfect squares
    }
    int root = sqrt( (double)(num) );
    //cout << root << " " << num << endl ;
    return (root * root == num);

}


int main()
{
     vector<int> numbers = {1 , 4, 5, 6, 9, 10 };

      //TO DO
      //Replace  isPerfectSquare by a lambda expression
      //Put bool as an explicit type
      //Capture clause is empty
      //Pass a single const int& as an argument
       int count = count_if(numbers.begin(), numbers.end(),
                       isPerfectSquare  );
       cout << count << endl ;

    return 0;
}