![\"\"](\"https://assets.leetcode.com/uploads/2023/02/14/yetgriddrawio-8.png\")
You are given a m x n matrix grid consisting of non-negative integers where grid[row][col] represents the minimum time required to be able to visit the cell (row, col), which means you can visit the cell (row, col) only when the time you visit it is greater than or equal to grid[row][col].
You are standing in the top-left cell of the matrix in the 0th second, and you must move to any adjacent cell in the four directions: up, down, left, and right. Each move you make takes 1 second.
Return the minimum time required in which you can visit the bottom-right cell of the matrix. If you cannot visit the bottom-right cell, then return -1.
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Example 1:
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\nInput: grid = [[0,1,3,2],[5,1,2,5],[4,3,8,6]]\nOutput: 7\nExplanation: One of the paths that we can take is the following:\n- at t = 0, we are on the cell (0,0).\n- at t = 1, we move to the cell (0,1). It is possible because grid[0][1] <= 1.\n- at t = 2, we move to the cell (1,1). It is possible because grid[1][1] <= 2.\n- at t = 3, we move to the cell (1,2). It is possible because grid[1][2] <= 3.\n- at t = 4, we move to the cell (1,1). It is possible because grid[1][1] <= 4.\n- at t = 5, we move to the cell (1,2). It is possible because grid[1][2] <= 5.\n- at t = 6, we move to the cell (1,3). It is possible because grid[1][3] <= 6.\n- at t = 7, we move to the cell (2,3). It is possible because grid[2][3] <= 7.\nThe final time is 7. It can be shown that it is the minimum time possible.\n\n\n
Example 2:
\n\n![\"\"](\"https://assets.leetcode.com/uploads/2023/02/14/yetgriddrawio-9.png\")
\nInput: grid = [[0,2,4],[3,2,1],[1,0,4]]\nOutput: -1\nExplanation: There is no path from the top left to the bottom-right cell.\n\n\n
\n
Constraints:
\n\nm == grid.lengthn == grid[i].length2 <= m, n <= 10004 <= m * n <= 1050 <= grid[i][j] <= 105grid[0][0] == 0\n\n", "translatedTitle": "在网格图中访问一个格子的最少时间", "translatedContent": "
给你一个 m x n 的矩阵 grid ，每个元素都为 非负 整数，其中 grid[row][col] 表示可以访问格子 (row, col) 的 最早 时间。也就是说当你访问格子 (row, col) 时，最少已经经过的时间为 grid[row][col] 。
你从 最左上角 出发，出发时刻为 0 ，你必须一直移动到上下左右相邻四个格子中的 任意 一个格子（即不能停留在格子上）。每次移动都需要花费 1 单位时间。
请你返回 最早 到达右下角格子的时间，如果你无法到达右下角的格子，请你返回 -1 。
\n\n
示例 1：
\n\n
\n输入：grid = [[0,1,3,2],[5,1,2,5],[4,3,8,6]]\n输出：7\n解释：一条可行的路径为：\n- 时刻 t = 0 ，我们在格子 (0,0) 。\n- 时刻 t = 1 ，我们移动到格子 (0,1) ，可以移动的原因是 grid[0][1] <= 1 。\n- 时刻 t = 2 ，我们移动到格子 (1,1) ，可以移动的原因是 grid[1][1] <= 2 。\n- 时刻 t = 3 ，我们移动到格子 (1,2) ，可以移动的原因是 grid[1][2] <= 3 。\n- 时刻 t = 4 ，我们移动到格子 (1,1) ，可以移动的原因是 grid[1][1] <= 4 。\n- 时刻 t = 5 ，我们移动到格子 (1,2) ，可以移动的原因是 grid[1][2] <= 5 。\n- 时刻 t = 6 ，我们移动到格子 (1,3) ，可以移动的原因是 grid[1][3] <= 6 。\n- 时刻 t = 7 ，我们移动到格子 (2,3) ，可以移动的原因是 grid[2][3] <= 7 。\n最终到达时刻为 7 。这是最早可以到达的时间。\n\n\n
示例 2：
\n\n
\n输入：grid = [[0,2,4],[3,2,1],[1,0,4]]\n输出：-1\n解释：没法从左上角按题目规定走到右下角。\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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