grade clustering using iterators

gc_it.cpp

#include <iostream>
#include <vector>

int main()
{
    std::vector<unsigned> scores(11, 0);
    unsigned grade = 0;
    auto it = scores.begin();

    for(;std::cin >> grade;) {
        if (grade <= 100) {
            *(it + (grade / 10)) += 1;
        }
    }

   for(std::vector<unsigned>::iterator it2 = scores.begin(); it2 != scores.end(); ++it2)
       std::cout << *it2 << std::endl;

    return 0;
}