2658. Maximum Number of Fish in a Grid

You are given a 0-indexed 2D matrix grid of size m x n, where (r, c) represents: - A land cell if grid[r][c] = 0, or - A water cell containing grid[r][c] fish, if grid[r][c] > 0. A fisher can start at any water cell (r, c) and can do the following operations any number of times: - Catch all the fish at cell (r, c), or - Move to any adjacent water cell. Return the maximum number of fish the f