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Java-based LeetCode algorithm problem solutions, regularly updated

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1424\. Diagonal Traverse II

Medium

Given a 2D integer array `nums`, return _all elements of_ `nums` _in diagonal order as shown in the below images_.

**Example 1:**

![](https://assets.leetcode.com/uploads/2020/04/08/sample_1_1784.png)

**Input:** nums = [[1,2,3],[4,5,6],[7,8,9]]

**Output:** [1,4,2,7,5,3,8,6,9]

**Example 2:**

![](https://assets.leetcode.com/uploads/2020/04/08/sample_2_1784.png)

**Input:** nums = [[1,2,3,4,5],[6,7],[8],[9,10,11],[12,13,14,15,16]]

**Output:** [1,6,2,8,7,3,9,4,12,10,5,13,11,14,15,16]

**Constraints:**

*   1 <= nums.length <= 10⁵
*   1 <= nums[i].length <= 10⁵
*   1 <= sum(nums[i].length) <= 10⁵
*   1 <= nums[i][j] <= 10⁵