Grokking the Engineering Manager Coding Interview
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Zigzag Iterator (medium)
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Problem Statement

Examples

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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.

Examples

Example 1

  • 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.size() + v2.size() number of calls to the next() method.

Example 2

  • Input: V1 = [1, 2, 3, 4], v2 = [5,6]
  • Expected Output: [1,5,2,6,3,4]
  • Explanation: The elements will be returned in [1,5,2,6,3,4] order when we make v1.size() + v2.size() number of calls to the next() method.

Example 3

  • Input: V1 = [1, 2], v2 = []
  • Expected Output: [1,2]
  • Explanation: The elements will be returned in [1, 2] order when we make v1.size() + v2.size() number of calls to the next() method.

Constraints:

  • 0 <= v1.length, v2.length <= 1000
  • 1 <= v1.length + v2.length <= 2000
  • -2<sup>31</sup> <= v1[i], v2[i] <= 2<sup>31</sup> - 1

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Python3
Python3
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On this page

Problem Statement

Examples

Try it yourself