Fuck

#define range(a, b, step) ([](){assert((step)!=0); assert((1-2*((unsigned)(step)>>31))*(a)<=(1-2*((unsigned)(step)>>31))*(b)); auto v = std::vector<int>{}; for (auto i = (a); (1-2*((unsigned)(step)>>31))*i < (1-2*((unsigned)(step)>>31))*(b); i += (step)) v.push_back(i); return v;}())


#include <iostream>
#include <vector>
#include <cassert>

template <typename Int>
constexpr auto range(Int a, Int b, Int step) {
    assert(a <= b);
    assert((b-a)%step == 0);
    auto v = std::vector<Int>{};
    for(auto i_ = a; i_ < b; i_ += step) {
        v.push_back(i_);
    }
    return v;
}

template <typename Int>
constexpr auto range(Int a, Int b) {
    return range(a, b, (Int)(1));
}

int main() {
    std::vector<float> test = {1.0f, 0.0f, -5.0f, 30.3f, 10.2f, 9.7f};

    for(auto i : range(0, 6, 2)) {
        std::cout << test[i] << "\n";
    }

    std::cout << "\n";

    for(auto i : range(0, 6)) {
        std::cout << test[i] << "\n";
    }

    return 0;
}