what is the correct/required headers to have for c++ code?

here is my c++code:

#include <set-location; ip address generator.exe location= C:\Users\yda\ip
using namespace std;
{

int main()
}
// Function checks whether IP digits
// are valid or not.
int is_valid(string ip)
{
    // Splitting by "."
    vector <string> ips;
    string ex = "";
    for(int i = 0; i < ip.size(); i++)
    {
        if (ip[i] == '.')
        {
            ips.push_back(ex);
            ex = "";
        }
        else
        {
            ex = ex + ip[i];
        }
    }
    ips.push_back(ex);
 
    // Checking for the corner cases
    // cout << ip << endl;
    for(int i = 0; i < ips.size(); i++)
    {
        // cout << ips[i] <<endl;
        if( ips[i].length() > 3 || 
            stoi(ips[i]) < 0 || 
            stoi(ips[i]) > 255 )
            return 0;
 
        if( ips[i].length() > 1 && 
            stoi(ips[i]) == 0)
            return 0;
 
        if( ips[i].length() > 1 && 
            stoi(ips[i]) != 0 && 
            ips[i][0] == '0')
            return 0;
    }
    return 1;
}
 
// Function converts string to IP address
void convert(string ip)
{
    int l = ip.length();
 
    // Check for string size
    if ( l>12 || l<4 )
    {
        cout << "Not Valid IP Address";
    }
 
    string check = ip;
    vector <string> ans;
 
    // Generating different combinations.
    for( int i = 1; i < l - 2; i++ )
    {
        for( int j = i + 1; j < l - 1; j++ )
        {
            for( int k = j + 1; k < l; k++ )
            {
                check = check.substr(0, k) + "." + 
                        check.substr(k, l - k + 2);
                check = check.substr(0, j) + "." + 
                        check.substr(j, l - j + 3);
                check = check.substr(0, i) + "." + 
                        check.substr(i, l - i + 4);
 
                // cout<< check <<endl;
                // Check for the validity of combination
                if (is_valid(check))
                {
                    ans.push_back (check);
                    std::cout << check << '\n';
                }
                check = ip;
            }
        }
    }
}
 
// Driver code
int main()
{
    string A = "25525511135";
    string B = "25505011535";
 
    convert(A);
    convert(B);
 
    return 0;
}