清除行列

题目描述

[[1,2,3],[0,1,2],[0,0,1]]

返回：[[0,0,3],[0,0,0],[0,0,0]]

import java.util.*;

public class Clearer {
public int[][] clearZero(int[][] mat, int n) {
// write code here
boolean[] row = new boolean[mat.length];
boolean[] column = new boolean[mat[0].length];
for(int i = 0 ;i < mat.length;++i)
{
for(int j = 0 ;j < mat[0].length;++j)
{
if(mat[i][j] == 0)
{
row[i] = column[j] = true;
}
}
}

for(int i = 0 ;i < mat.length;++i)
{
for(int j = 0 ;j < mat[0].length;++j)
{
if(mat[i][j] !=0 && (row[i] || column[j])) mat[i][j] = 0;
}
}
return mat;
}
}