73. Set Matrix Zeroes

Posted 2020-10-08 鸵鸟

public class Solution {
    public void setZeroes(int[][] matrix) {
        if(matrix.length==0||matrix[0].length==0)
            return;
        boolean row0=false;
        for(int i=0;i<matrix.length;i++)
            for(int j=0;j<matrix[0].length;j++)
                if(matrix[i][j]==0)
                {
                    if(i==0)
                        row0=true;
                    else
                    {
                        matrix[i][0]=0;
                        matrix[0][j]=0;
                    }
                }
        for(int i=matrix.length-1;i>=0;i--)
            for(int j=matrix[0].length-1;j>=0;j--)
            {
                if(i==0)
                    matrix[i][j]=row0==true?0:matrix[i][j];
                else if(matrix[0][j]==0||matrix[i][0]==0)
                    matrix[i][j]=0;
            }
     }
}