diagonal-traverse

Diagonal Traverse

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findDiagonalOrder

Given an <code>m x n</code> matrix <code>mat</code>, return an array of all the elements of the array in a diagonal order.

&nbsp;
Example 1:
<img alt="" src="https://assets.leetcode.com/uploads/2021/04/10/diag1-grid.jpg" style="width: 334px; height: 334px;" />
<pre>
Input: mat = [[1,2,3],[4,5,6],[7,8,9]]
Output: [1,2,4,7,5,3,6,8,9]
</pre>

Example 2:

<pre>
Input: mat = [[1,2],[3,4]]
Output: [1,2,3,4]
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>m == mat.length</code></li>
	<li><code>n == mat[i].length</code></li>
	<li><code>1 &lt;= m, n &lt;= 104</code></li>
	<li><code>1 &lt;= m * n &lt;= 104</code></li>
	<li><code>-105 &lt;= mat[i][j] &lt;= 105</code></li>
</ul>

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