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set_matrix_zeroes.java
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set_matrix_zeroes.java
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public class set_matrix_zeroes {
//利用第1行和第1列的空间做记录
public void setZeroes(int[][] matrix) {
//遍历第0行
int row_length = matrix.length; //行数
int col_length = matrix[0].length; //列数
boolean row0 = false; //记录第0行是否有0
boolean col0 = false; //记录第0列是否有0
if(row_length <= 0 || col_length <= 0){
return;
}else if(row_length == 1 || col_length == 1){ //只有1行或者1列时
for(int i = 0; i < row_length; i++){
for(int j = 0; j < col_length; j++){
if(matrix[i][j] == 0){
row0 = true;
break;
}
}
}
if(row0 == true){
for(int i = 0; i < row_length; i++){
for(int j = 0; j < col_length; j++){
matrix[i][j] = 0;
}
}
}
}else{ //行列都大于1时,判断第0行和第0列是否有0
for(int j = 0; j < col_length; j++){
if(matrix[0][j] == 0){
row0 = true;
break;
}
}
for(int i = 0; i < row_length; i++){
if(matrix[i][0] == 0){
col0 = true;
break;
}
}
//遍历整个数组,判断是否为0
for(int i = 1; i < row_length; i++){
for(int j = 1; j < col_length; j++){
if(matrix[i][j] == 0){
matrix[i][0] = 0; //将该结果保存到[i, 0]相应位置
matrix[0][j] = 0; //将该结果保存到[0, j]相应位置
}
}
}
//遍历第0行和第0列,将0所在的行或者列设置为0
for(int i = 1; i < row_length; i++){
if(matrix[i][0] == 0){
for(int j = 1; j < col_length; j++){
matrix[i][j] = 0;
}
}
}
for(int j = 1; j < col_length; j++){
if(matrix[0][j] == 0){
for(int i = 1; i < row_length; i++){
matrix[i][j] = 0;
}
}
}
//最后改变第0行和第0列
if(row0){
for(int j = 0; j < col_length; j++){
matrix[0][j] = 0;
}
}
if(col0){
for(int i = 0; i < row_length; i++){
matrix[i][0] = 0;
}
}
}
}
}