C++ vector of int and add value to the vector

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;
int main()/*from   ww w  . j  a va2s .  c o  m*/
{
   const int NUMELS = 4;
   int n[] = {136, 122, 109, 146};
   int i;
   vector<int> partnums(n, n + NUMELS);
   cout << endl;
   for (i = 0; i < int(partnums.size()); i++)
      cout << partnums[i] << "   ";
   cout << endl;
   partnums[3] = 144;
   for (i = 0; i < int(partnums.size()); i++)
      cout << partnums[i] << "  ";
   cout << endl;
   partnums.insert(partnums.begin()+1, 142);
   for (i = 0; i < int(partnums.size()); i++)
      cout << partnums[i] << "  ";
   cout << endl;
   partnums.push_back(157);
   for (i = 0; i < int(partnums.size()); i++)
      cout << partnums[i] << "  ";
   cout << endl;
   sort(partnums.begin(), partnums.end());
   for (i = 0; i < int(partnums.size()); i++)
      cout << partnums[i] << "  ";
   cout << endl;
   return 0;
}