编写一种算法,若M × N矩阵中某个元素为0,则将其所在的行与列清零。
示例 1:
输入:
[
[1,1,1],
[1,0,1],
[1,1,1]
]
输出:
[
[1,0,1],
[0,0,0],
[1,0,1]
]
示例 2:
输入:
[
[0,1,2,0],
[3,4,5,2],
[1,3,1,5]
]
输出:
[
[0,0,0,0],
[0,4,5,0],
[0,3,1,0]
]
题解:
class Solution {
public void setZeroes(int[][] matrix) {
int lenx = matrix.length, leny = matrix[0].length;
boolean[] row = new boolean[lenx],col = new boolean[leny];
for(int i = 0;i<lenx;i++){
for(int j=0;j<leny;j++){
if(matrix[i][j]==0){
row[i] = true;
col[j] = true;
}
}
}
for(int i=0;i<lenx;i++){
for(int j=0;j<leny;j++){
if(row[i]||col[j]){
matrix[i][j]=0;
}
}
}
}
}