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.

• The grid is rectangular, and each cell is a square with a side length 1.

Your task is to calculate the perimeter of the island.

Constraints:

• row $==$ grid.length

• col $==$ grid[i].length

• $1\leq$ row, col $\leq100$

• grid[i][j] is $0$ or $1$.

• There is exactly one island in grid.

Let’s take a moment to make sure you’ve correctly understood the problem. The quiz below helps you check if you’re solving the correct problem:

We have a game for you to play. Rearrange the logical building blocks to develop a clearer understanding of how to solve this problem.

Implement your solution in the following coding playground.