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0073-set-matrix-zeroes.adoc

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73. Set Matrix Zeroes

Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in-place.

Example 1:

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

Example 2:

Input:
[
  [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]
]

Follow up:

  • A straight forward solution using O(m__n) 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?

link:{sourcedir}/_0073_SetMatrixZeroes.java[role=include]