286. Walls and Gates

Source: Internet
Author: User

You is given a m x n 2D grid initialized with these three possible values.

    1. -1-A wall or an obstacle.
    2. 0-Gate A.
    3. INF-Infinity means a empty room. We use the value of represent as assume that the 231 - 1 = 2147483647 distance to INF a gate are less than 2147483647 .

Fill each empty and the distance to its nearest gate. If It is the impossible to reach a gate, it should are filled with INF .

For example, given the 2D grid:

Inf -1 0 Inf
Inf Inf Inf -1
Inf -1 Inf -1
0 -1 Inf Inf


After running your function, the 2D grid should is:

  3  -1   0   1  2   2   1  -1  1  -1   2  -1  0  -1   3   4
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286. Walls and Gates

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