Solution: Island Perimeter
Explore how to calculate the perimeter of an island represented in a grid of land and water cells. This lesson guides you through the step-by-step algorithm that accounts for shared edges between cells and explains how to implement it efficiently using JavaScript, focusing on key matrix operations and time-space complexity tradeoffs.
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Statement
You are given a grid with dimensions row x col, where each cell represents either land (grid[i][j] = 1) or water (grid[i][j] = 0). The grid satisfies the following conditions:
Cells are connected only horizontally or vertically (not diagonally).
The grid is surrounded by water and contains exactly one island, consisting of one or more connected land cells.
The island has no lakes, meaning no water is enclosed within the island that connects to the surrounding water. ...