SDET-2

Ninja has given a nested list of integers nestedList of size 'N'. Each element is either an integer or a list whose elements may also be integers or other lists.

Ninjas have asked to implement the following methods of the NestedIterator class.

NestedIterator(vector<NestedInteger> nestedList) Initializes the 
iterator with the nested list nestedList.
int next() Returns the next integer in the nested list.
bool hasNext() Returns true if there are still some integers in the nested list and false otherwise.

Your task is to help the ninja to implement the above methods.

Your code will be tested with the following pseudocode:

initialize iterator with nestedList
  answer = []
  while iterator.hasNext()
    append iterator.next() to the end of answer
    return answer

You will get the correct answer verdict if the answer matches the expected flattened list.

EXAMPLE:

Input List: [[1, 1], 2, [1, 1]]
Output List: [1, 1, 2, 1, 1]

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