longest-increasing-path-in-a-matrix

Longest Increasing Path in a Matrix

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longestIncreasingPath

Given an <code>m x n</code> integers <code>matrix</code>, return the length of the longest increasing path in <code>matrix</code>.

From each cell, you can either move in four directions: left, right, up, or down. You may not move diagonally or move outside the boundary (i.e., wrap-around is not allowed).

&nbsp;
Example 1:
<img alt="" src="https://assets.leetcode.com/uploads/2021/01/05/grid1.jpg" style="width: 242px; height: 242px;" />
<pre>
Input: matrix = [[9,9,4],[6,6,8],[2,1,1]]
Output: 4
Explanation: The longest increasing path is <code>[1, 2, 6, 9]</code>.
</pre>

Example 2:
<img alt="" src="https://assets.leetcode.com/uploads/2021/01/27/tmp-grid.jpg" style="width: 253px; height: 253px;" />
<pre>
Input: matrix = [[3,4,5],[3,2,6],[2,2,1]]
Output: 4
Explanation: The longest increasing path is <code>[3, 4, 5, 6]</code>. Moving diagonally is not allowed.
</pre>

Example 3:

<pre>
Input: matrix = [[1]]
Output: 1
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>m == matrix.length</code></li>
	<li><code>n == matrix[i].length</code></li>
	<li><code>1 &lt;= m, n &lt;= 200</code></li>
	<li><code>0 &lt;= matrix[i][j] &lt;= 231 - 1</code></li>
</ul>

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