{ "data": { "question": { "questionId": "1036", "questionFrontendId": "994", "boundTopicId": null, "title": "Rotting Oranges", "titleSlug": "rotting-oranges", "content": "

You are given an m x n grid where each cell can have one of three values:

\n\n\n\n

Every minute, any fresh orange that is 4-directionally adjacent to a rotten orange becomes rotten.

\n\n

Return the minimum number of minutes that must elapse until no cell has a fresh orange. If this is impossible, return -1.

\n\n

 

\n

Example 1:

\n\"\"\n
\nInput: grid = [[2,1,1],[1,1,0],[0,1,1]]\nOutput: 4\n
\n\n

Example 2:

\n\n
\nInput: grid = [[2,1,1],[0,1,1],[1,0,1]]\nOutput: -1\nExplanation: The orange in the bottom left corner (row 2, column 0) is never rotten, because rotting only happens 4-directionally.\n
\n\n

Example 3:

\n\n
\nInput: grid = [[0,2]]\nOutput: 0\nExplanation: Since there are already no fresh oranges at minute 0, the answer is just 0.\n
\n\n

 

\n

Constraints:

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