Max Area Of Island :
Difficulty Level : Easy
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Asked In :
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You are given an n x m 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.
Input
The first line contains N (1 <= N <= 1e4) and M (1 <= M <=1e4)
The next N lines contains M integers, 0 or 1 representing the grid.
N*M <= 1e4 for all test cases
Output
Output a single integer, max are of the island.
Examples
Input
5 5 0 0 0 1 0 0 0 1 1 1 0 1 1 1 1 0 0 0 0 0 0 0 0 0 0
Output
8
Input
5 5 0 0 1 0 0 0 1 1 0 1 0 0 0 0 1 0 0 1 0 0 0 0 0 0 1
Output
3
Input
3 3 0 0 0 0 0 0 0 0 0
Output
0
