Euler 2

#include <iostream>
#include <vector>

static void fib(std::vector<unsigned int> &v) {
    unsigned int x = 1, y = 2;
    do {
        if (!(x & 1))
            v.push_back(x);
        y = x + y;
        x = y - x;
    } while (x < 4000000);
}

int main() {
    unsigned int anitta = 0;
    std::vector<unsigned int> v;
    fib(v);
    for (unsigned short i = 0; i < v.size(); ++i)
        anitta += v.at(i);
    std::cout << anitta << '\n';
}