Solution: Zigzag Iterator

Grokking the Engineering Manager Coding Interview

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Solution: Zigzag Iterator

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Problem Statement

Given two 1d vectors, implement an iterator to return their elements alternately.

Implement the Solution class:

Solution(List<int> v1, List<int> v2) is a constructor.
int next() returns the current element of the iterator and moves the iterator to the next element.
boolean hasNext() returns true if the iterator still has elements, and false otherwise.

Input: V1 = [1,2], v2 = [3,4,5,6]
Expected Output: [1,3,2,4,5,6]
Explanation: The elements will be returned in [1,3,2,4,5,6] order when we make v1

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