Grokking 75: Top Coding Interview Questions
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Set Matrix Zeroes (medium)
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Problem Statement

Given a 2D grid of numbers called matrix, if any number in the grid is 0, set the entire row and column containing that zero to zeros.

The grid should be modified in place without using any extra grid.

Examples

Example 1:

  • Input: matrix =
[[2, 3, 4], 
 [5, 0, 6], 
 [7, 8, 9]]
  • Expected Output:
[[2, 0, 4], 
 [0, 0, 0], 
 [7, 0, 9]]
  • Justification: The element at position (1, 1) is zero. So, the second row and column are set to zero.

Example 2:

  • Input: matrix =
[[0, 2, 3], 
 [4, 5, 6], 
 [7, 8, 9]]
  • Expected Output:
[[0, 0, 0], 
 [0, 5, 6], 
 [0, 8, 9]]
  • Justification: The element at position (0, 0) is zero. So, the first row and column are set to zero.

Example 3:

  • Input: matrix =
[[1, 2, 3, 7], 
 [4, 0, 6, 8], 
 [0, 8, 9, 6],
 [1, 4, 6, 4]]
  • Expected Output:
[[0, 0, 3, 7], 
 [0, 0, 0, 0], 
 [0, 0, 0, 0],
 [0, 0, 6, 4]
  • Justification: The elements at position (1, 1), and (2, 0) are zero. So, the respected rows and columns are set to zero.

Constraints:

  • m == matrix.length
  • n == matrix[0].length
  • 1 <= m, n <= 200
  • -2<sup>31</sup> <= matrix[i][j] <= 2<sup>31</sup> - 1

Try it yourself

Try solving this question here:

Python3
Python3
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