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Grokking the Coding Interview Patterns

Solution: Number of Islands

Explore how to apply the union find pattern to identify and count islands in a 2D grid of water and land cells. This lesson guides you through building a solution that connects neighboring land cells into components and returns the total number of islands efficiently. Understand traversal, union operations, and how to manage counts for an optimal approach.

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Statement

Let’s consider a scenario with an (m×n)(m \times n) 2D grid containing binary numbers, where '0' represents water and '1' represents land. If any '1' cells are connected to each other horizontally or vertically (not diagonally), they form an island. Your task is to return the total number of islands in the grid.

Constraints:

  • 1≤1 \leq grid.length ≤50\leq 50 ...