Grokking Graph Algorithms for Coding Interviews
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Biggest Island (easy)
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Problem Statement

Given a 2D array (i.e., a matrix) containing only 1s (land) and 0s (water), find the biggest island in it. Write a function to return the area of the biggest island. 

An island is a connected set of 1s (land) and is surrounded by either an edge or 0s (water). Each cell is considered connected to other cells horizontally or vertically (not diagonally).

Example 1

Input: matrix =

Output: 5
Explanation: The matrix has three islands. The biggest island has 5 cells .

Constraints:

  • m == matrix.length
  • n == matrix[i].length

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