You are given a nested list of integers
nestedList. Each element is either an integer or a list whose elements may also be integers or other lists. Implement an iterator to flatten it.
NestedIterator(List<NestedInteger> nestedList)Initializes the iterator with the nested list
int next()Returns the next integer in the nested list.
trueif there are still some integers in the nested list and
Your code will be tested with the following pseudocode:
initialize iterator with nestedList res =  while iterator.hasNext() append iterator.next() to the end of res return res
res matches the expected flattened list, then your code will be judged as correct.
Input: nestedList = [[1,1],2,[1,1]] Output: [1,1,2,1,1] Explanation: By calling next repeatedly until hasNext returns false, the order of elements returned by next should be: [1,1,2,1,1].
Input: nestedList = [1,[4,]] Output: [1,4,6] Explanation: By calling next repeatedly until hasNext returns false, the order of elements returned by next should be: [1,4,6].
1 <= nestedList.length <= 500