Unity API

#include <iostream>
#include <vector>

int test(int t, int length)
{
    if(t / length % 2 == 1)
        return length - t % length;
    else
        return t % length;
}

int main()
{
    int length = 3;
    std::vector<int> vect{0,1,2,3,4,5,6,7,8};
    for(auto& item : vect)
    {
        std::cout<<test(item,length)<<",";
    }
}