Follow up: As an added challenge, try to code it using only iterators in C++ or iterators in Java. A straightforward way is to flatten the 2D array into a 1D array in the constructor, then everything ...

Design an iterator to flatten a 2D vector. It should support the next and hasNext operations. Implement the Vector2D class: Vector2D(int[][] vec) initializes the object with the 2D vector vec. next() ...