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Grokking the Coding Interview Patterns in Python

Solution: Number of Islands

Explore the Union Find approach to identify connected land cells in a binary grid. This lesson guides you through counting islands by merging adjacent land cells, optimizing both time and space complexity. Understand how to implement and apply union operations to solve common graph connectivity problems.

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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 ...