![\"\"](\"https://assets.leetcode.com/uploads/2024/04/08/moregridsdrawio-1.png\")
You are given an m x n matrix grid consisting of positive integers. You can move from a cell in the matrix to any other cell that is either to the bottom or to the right (not necessarily adjacent). The score of a move from a cell with the value c1 to a cell with the value c2 is c2 - c1.
You can start at any cell, and you have to make at least one move.
\n\nReturn the maximum total score you can achieve.
\n\n\n
Example 1:
\n![\"\"](\"https://assets.leetcode.com/uploads/2024/03/14/grid1.png\")
\nInput: grid = [[9,5,7,3],[8,9,6,1],[6,7,14,3],[2,5,3,1]]
\n\nOutput: 9
\n\nExplanation: We start at the cell (0, 1), and we perform the following moves:
\n- Move from the cell (0, 1) to (2, 1) with a score of 7 - 5 = 2.
\n- Move from the cell (2, 1) to (2, 2) with a score of 14 - 7 = 7.
\nThe total score is 2 + 7 = 9.
Example 2:
\n\n
Input: grid = [[4,3,2],[3,2,1]]
\n\nOutput: -1
\n\nExplanation: We start at the cell (0, 0), and we perform one move: (0, 0) to (0, 1). The score is 3 - 4 = -1.
\n
Constraints:
\n\nm == grid.lengthn == grid[i].length2 <= m, n <= 10004 <= m * n <= 1051 <= grid[i][j] <= 105(x1, y1) to another cell (x2, y2) will always have a score of grid[x2][y2] - grid[x1][y1].",
"Let’s say we fix the starting cell (x1, y1), how to the find a cell (x2, y2) such that the value grid[x2][y2] - grid[x1][y1] is the maximum possible?"
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