Leetcode 73. Set Matrix Zeroes

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

public class Solution {    public void setZeroes(int[][] matrix) {      int m = matrix.length;      if(m == 0)        return;      int n = matrix[0].length;      boolean firstRow = false;      boolean firstColumn = false;      for(int i = 0; i < m; i++){        if(matrix[i][0] == 0)          firstColumn = true;      }      for(int i = 0; i < n; i++){        if(matrix[0][i] == 0)          firstRow = true;      }      for(int i = 1; i < m; i++){        for(int j = 1; j < n; j++){          if(matrix[i][j] == 0){            matrix[i][0] = 0;            matrix[0][j] = 0;          }        }      }      for(int i = 0; i < m; i++){        if(matrix[i][0] == 0){          for(int j = 0; j < n; j++){            matrix[i][j] = 0;          }        }      }      for(int i = 0; i < n; i++){        if(matrix[0][i] == 0){          for(int j = 0; j < m;j++){            matrix[j][i] = 0;          }        }      }      if(firstRow){        for(int i = 0; i < n; i++){          matrix[0][i] = 0;         }      }      if(firstColumn){        for(int i = 0; i < m; i++){          matrix[i][0] = 0;        }      }    }}

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