0994. Rotting Oranges
https://leetcode.com/problems/rotting-oranges
Description
You are given an m x n
grid
where each cell can have one of three values:
0
representing an empty cell,1
representing a fresh orange, or2
representing a rotten orange.
Every minute, any fresh orange that is 4-directionally adjacent to a rotten orange becomes rotten.
Return the minimum number of minutes that must elapse until no cell has a fresh orange. If this is impossible, return -1
.
Example 1:

**Input:** grid = [[2,1,1],[1,1,0],[0,1,1]]
**Output:** 4
Example 2:
**Input:** grid = [[2,1,1],[0,1,1],[1,0,1]]
**Output:** -1
**Explanation:** The orange in the bottom left corner (row 2, column 0) is never rotten, because rotting only happens 4-directionally.
Example 3:
**Input:** grid = [[0,2]]
**Output:** 0
**Explanation:** Since there are already no fresh oranges at minute 0, the answer is just 0.
Constraints:
m == grid.length
n == grid[i].length
1 <= m, n <= 10
grid[i][j]
is0
,1
, or2
.
ac
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