542. 01 Matrix

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https://leetcode.com/problems/01-matrix/

Given a matrix consists of 0 and 1, find the distance of the nearest 0 for each cell.

The distance between two adjacent cells is 1.

 

Example 1:

Input:
[[0,0,0],
 [0,1,0],
 [0,0,0]]

Output:
[[0,0,0],
 [0,1,0],
 [0,0,0]]

Example 2:

Input:
[[0,0,0],
 [0,1,0],
 [1,1,1]]

Output:
[[0,0,0],
 [0,1,0],
 [1,2,1]]

 

Note:

  1. The number of elements of the given matrix will not exceed 10,000.
  2. There are at least one 0 in the given matrix.
  3. The cells are adjacent in only four directions: up, down, left and right.
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