seive.cpp

void seive_of_eratosthenes(set<int> *nums, int max_value) {
    set<int>::iterator it;
    for(it = nums->begin(); it != nums->end(); it++){
        int num = *it;
        for(int i = 2*num; i <= max_value; i+= num){
            nums->erase(i);
        }
    }
}