# 341. Flatten Nested List Iterator LeetCode Solution | Easy Approach

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Flatten Nested List Iterator 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.

Implement the `NestedIterator` class:

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

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
```

If `res` matches the expected flattened list, then your code will be judged as correct.

Example 1:

```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].
```

Example 2:

```Input: nestedList = [1,[4,[6]]]
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].
```

Constraints:

• `1 <= nestedList.length <= 500`
• The values of the integers in the nested list is in the range `[-106, 106]`.

Time: O(n)
Space: O(n)

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