#include <iostream>
#include <vector>

int main(void){
    std::vector<int> v(3);
    v[0] = 10;
    v[1] = 20;
    v[2] = 30;

    std::vector<int>::reverse_iterator rit;

    int i = 0;
    for(rit = v.rbegin(); rit != v.rend(); rit++)
        *rit = ++i;

    std::vector<int>::iterator it;
    for(it = v.begin(); it != v.end(); it++)
        std::cout << *it << std::endl;


    return 0;
}