{ "data": { "question": { "questionId": "463", "questionFrontendId": "463", "boundTopicId": null, "title": "Island Perimeter", "titleSlug": "island-perimeter", "content": "

You are given row x col grid representing a map where grid[i][j] = 1 represents land and grid[i][j] = 0 represents water.

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Grid cells are connected horizontally/vertically (not diagonally). The grid is completely surrounded by water, and there is exactly one island (i.e., one or more connected land cells).

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The island doesn't have "lakes", meaning the water inside isn't connected to the water around the island. One cell is a square with side length 1. The grid is rectangular, width and height don't exceed 100. Determine the perimeter of the island.

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Example 1:

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\nInput: grid = [[0,1,0,0],[1,1,1,0],[0,1,0,0],[1,1,0,0]]\nOutput: 16\nExplanation: The perimeter is the 16 yellow stripes in the image above.\n
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Example 2:

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\nInput: grid = [[1]]\nOutput: 4\n
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Example 3:

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\nInput: grid = [[1,0]]\nOutput: 4\n
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Constraints:

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