vectorn.cpp

template<int D>
struct Vector {
  
  static constexpr unsigned N = D;
  int data[N];
  
  Vector(int fill = 0) {
    for (int i = 0; i < N; ++i) {
      data[i] = fill;
    }
  }

  int& operator[] (unsigned const& i) {
    if (N <= i) {
      throw "out of bound";
    }
    return data[i];
  }
 
   // begin, end, etc... 
};