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Grokking the Coding Interview Patterns in JavaScript

Solution: Number of Islands

Explore the Union Find pattern to solve the Number of Islands problem in a grid of 0s and 1s. Learn to identify connected land cells and count islands by merging them efficiently. This lesson guides you through initializing Union Find, performing unions among neighbors, and calculating the final number of islands, while understanding its time and space complexity.

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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 ...