set-matrix-zeroes


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Points: 3
Time limit: 30.0s
Memory limit: 250M

Problem type
Allowed languages
Python

Given an m x n integer matrix matrix, if an element is 0, set its entire row and column to 0's.

You must do it in place.

  Example 1:

Input: matrix = [[1,1,1],[1,0,1],[1,1,1]] Output: [[1,0,1],[0,0,0],[1,0,1]]

Example 2:

Input: matrix = [[0,1,2,0],[3,4,5,2],[1,3,1,5]] Output: [[0,0,0,0],[0,4,5,0],[0,3,1,0]]

  Constraints:

m == matrix.length
n == matrix[0].length
1 <= m, n <= 200
-2³¹ <= matrix[i][j] <= 2³¹ - 1

  Follow up:

A straightforward solution using O(mn) space is probably a bad idea.
A simple improvement uses O(m + n) space, but still not the best solution.
Could you devise a constant space solution?

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