![\"\"](\"https://assets.leetcode.com/uploads/2020/10/04/ex1.png\")
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.
\r\n\r\nReturn the minimum effort required to travel from the top-left cell to the bottom-right cell.
\r\n\r\n\r\n
Example 1:
\r\n\r\n
\r\nInput: heights = [[1,2,2],[3,8,2],[5,3,5]]\r\nOutput: 2\r\nExplanation: The route of [1,3,5,3,5] has a maximum absolute difference of 2 in consecutive cells.\r\nThis is better than the route of [1,2,2,2,5], where the maximum absolute difference is 3.\r\n\r\n\r\n
Example 2:
\r\n\r\n![\"\"](\"https://assets.leetcode.com/uploads/2020/10/04/ex2.png\")
\r\nInput: heights = [[1,2,3],[3,8,4],[5,3,5]]\r\nOutput: 1\r\nExplanation: 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].\r\n\r\n\r\n
Example 3:
\r\n![\"\"](\"https://assets.leetcode.com/uploads/2020/10/04/ex3.png\")
\r\n\r\nInput: 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]]\r\nOutput: 0\r\nExplanation: This route does not require any effort.\r\n\r\n\r\n
\r\n
Constraints:
\r\n\r\nrows == heights.lengthcolumns == heights[i].length1 <= rows, columns <= 1001 <= heights[i][j] <= 106你准备参加一场远足活动。给你一个二维 rows x columns 的地图 heights ，其中 heights[row][col] 表示格子 (row, col) 的高度。一开始你在最左上角的格子 (0, 0) ，且你希望去最右下角的格子 (rows-1, columns-1) （注意下标从 0 开始编号）。你每次可以往 上，下，左，右 四个方向之一移动，你想要找到耗费 体力 最小的一条路径。
一条路径耗费的 体力值 是路径上相邻格子之间 高度差绝对值 的 最大值 决定的。
\n\n请你返回从左上角走到右下角的最小 体力消耗值 。
\n\n\n\n
示例 1：
\n\n![\"\"](\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2020/10/25/ex1.png\")
\n输入：heights = [[1,2,2],[3,8,2],[5,3,5]]\n输出：2\n解释：路径 [1,3,5,3,5] 连续格子的差值绝对值最大为 2 。\n这条路径比路径 [1,2,2,2,5] 更优，因为另一条路径差值最大值为 3 。\n\n\n
示例 2：
\n\n![\"\"](\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2020/10/25/ex2.png\")
\n输入：heights = [[1,2,3],[3,8,4],[5,3,5]]\n输出：1\n解释：路径 [1,2,3,4,5] 的相邻格子差值绝对值最大为 1 ，比路径 [1,3,5,3,5] 更优。\n\n\n
示例 3：
\n![\"\"](\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2020/10/25/ex3.png\")
\n\n输入：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]]\n输出：0\n解释：上图所示路径不需要消耗任何体力。\n\n\n
\n\n
提示：
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collections<\\/a>\\u3002\\u5982\\u679c\\u60a8\\u9700\\u8981\\u4f7f\\u7528\\u5176\\u4ed6\\u5e93\\u51fd\\u6570\\uff0c\\u8bf7\\u81ea\\u884c\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n \\u6ce8\\u610f Python 2.7 \\u5c06\\u57282020\\u5e74\\u540e\\u4e0d\\u518d\\u7ef4\\u62a4<\\/a>\\u3002 \\u5982\\u60f3\\u4f7f\\u7528\\u6700\\u65b0\\u7248\\u7684Python\\uff0c\\u8bf7\\u9009\\u62e9Python 3\\u3002<\\/p>\"],\"c\":[\"C\",\" \\u7248\\u672c\\uff1a \\u7f16\\u8bd1\\u65f6\\uff0c\\u5c06\\u4f1a\\u91c7\\u7528 \\u4e3a\\u4e86\\u4f7f\\u7528\\u65b9\\u4fbf\\uff0c\\u5927\\u90e8\\u5206\\u6807\\u51c6\\u5e93\\u7684\\u5934\\u6587\\u4ef6\\u5df2\\u7ecf\\u88ab\\u81ea\\u52a8\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n \\u5982\\u60f3\\u4f7f\\u7528\\u54c8\\u5e0c\\u8868\\u8fd0\\u7b97, \\u60a8\\u53ef\\u4ee5\\u4f7f\\u7528 uthash<\\/a>\\u3002 \\\"uthash.h\\\"\\u5df2\\u7ecf\\u9ed8\\u8ba4\\u88ab\\u5bfc\\u5165\\u3002\\u8bf7\\u770b\\u5982\\u4e0b\\u793a\\u4f8b:<\\/p>\\r\\n\\r\\n 1. 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