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Grokking the Coding Interview Patterns

Solution: Number of Islands

Explore how to implement the Union Find algorithm to count the number of islands in a binary grid. Understand step-by-step how connected land cells form islands and how to efficiently merge and count these using union operations. This lesson develops skills in applying graph-based patterns to solve common algorithmic challenges.

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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 ...