Max Area of Island

You are given an `m x n` binary matrix `grid`. An island is a group of `1`'s (representing land) connected 4-directionally (horizontal or vertical.) You may assume all four edges of the grid are surrounded by water. The area of an island is the number of cells with a value `1` in the island. Return the maximum area of an island in `grid`. If there is no island, return `0`. ### Constraints - `m == grid.length`, `n == grid[i].length` - `1 <= m, n <= 50` - `grid[i][j]` is either `0` or `1`. ### Input Format - Line 1: Two space-separated integers `m` and `n`. - Next `m` lines: `n` space-separated integers (0 or 1). ### Output Format Print the maximum area of an island.