#include <vector>
#include <iostream>
#define SIZE 10
using namespace std;
 
int main() {
  vector<int> ints;
  for(int i=0; i<10; i++)
    ints.push_back(SIZE-i);
 
  for(vector<int>::iterator it=ints.begin(); it!=ints.end(); it++) {
    *it += 10;                         // we modify container here
    cout << *it << " ";
  }
  cout << endl;
  
  for(vector<int>::const_iterator it=ints.cbegin(); it!=ints.cend(); it++) {
    // *it += 10;       // this is not allowed for a const_iterator (only input iterator)
    cout << *it << " ";
  }
}