set matrix zeros

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

Copied method from:http://www.programcreek.com/2012/12/leetcode-set-matrix-zeroes-java/

This problem can solve by following 4 steps:

  • check if first row and column are zero or not
  • mark zeros on first row and column
  • use mark to set elements
  • set first column and row by using marks in step 1

Becareful of first row and column

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