You are a hiker preparing for an upcoming hike. You are given `heights`

, a 2D array of size `rows x columns`

, where `heights[row][col]`

represents the height of cell `(row, col)`

. You are situated in the top-left cell, `(0, 0)`

, and you hope to travel to the bottom-right cell, `(rows-1, columns-1)`

(i.e., **0-indexed**). You can move **up**, **down**, **left**, or **right**, and you wish to find a route that requires the minimum **effort**.

A route's **effort** is the **maximum absolute difference**** **in heights between two consecutive cells of the route.

Return *the minimum effort required to travel from the top-left cell to the bottom-right cell.*

**Example 1:**

Input:heights = [[1,2,2],[3,8,2],[5,3,5]]Output:2Explanation:The route of [1,3,5,3,5] has a maximum absolute difference of 2 in consecutive cells. This is better than the route of [1,2,2,2,5], where the maximum absolute difference is 3.

**Example 2:**

Input:heights = [[1,2,3],[3,8,4],[5,3,5]]Output:1Explanation:The route of [1,2,3,4,5] has a maximum absolute difference of 1 in consecutive cells, which is better than route [1,3,5,3,5].

**Example 3:**

Input:heights = [[1,2,1,1,1],[1,2,1,2,1],[1,2,1,2,1],[1,2,1,2,1],[1,1,1,2,1]]Output:0Explanation:This route does not require any effort.

**Constraints:**

`rows == heights.length`

`columns == heights[i].length`

`1 <= rows, columns <= 100`

`1 <= heights[i][j] <= 10`

^{6}

class Solution {
public int minimumEffortPath(int[][] heights) {
}
}