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Create SetMatrixToZero.java

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anujgaud 2024-03-16 23:36:32 +05:30 committed by GitHub
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core-java-modules/core-java-arrays-operations-advanced-2/src/main/java/com/baeldung/matrixtozero/SetMatrixToZero.java Normal file
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package com.baeldung.matrixtozero;
import java.util.*;
public class SetMatrixToZero{
static void setZeroesBruteForce(int[][] matrix) {
int row = matrix.length;
int col = matrix[0].length;
int [][] result = new int[row][col];
for(int i = 0; i<row; i++){
for(int j = 0; j < col; j++){
result[i][j] = matrix[i][j];
}
}
for(int i = 0; i < row; i++){
for(int j = 0; j < col; j++){
if(matrix[i][j] == 0){
for(int k = 0; k < col; k++){
result[i][k] = 0;
}
for(int k = 0; k < row; k++){
result[k][j] = 0;
}
}
}
}
for(int i = 0; i < row; i++){
for(int j = 0; j < col; j++){
matrix[i][j] = result[i][j];
}
}
}
static void setZeroesExtraSpace(int[][] matrix) {
int rows = matrix.length;
int cols = matrix[0].length;
Set<Integer> rowSet = new HashSet<>();
Set<Integer> colSet = new HashSet<>();
for(int i = 0; i < rows; i++){
for(int j = 0; j < cols; j++){
if (matrix[i][j] == 0){
rowSet.add(i);
colSet.add(j);
}
}
}
for(int row: rowSet){
for(int j = 0; j < cols; j++){
matrix[row][j] = 0;
}
}
for(int col: colSet) {
for(int i = 0; i < rows; i++){
matrix[i][col] = 0;
}
}
}
static void setZeroesOptimized(int[][] matrix){
int rows = matrix.length;
int cols = matrix[0].length;
boolean firstRowZero = false;
boolean firstColZero = false;
for(int j = 0; j < cols; j++){
if (matrix[0][j] == 0) {
firstRowZero = true;
break;
}
}
for(int i = 0; i < rows; i++){
if (matrix[i][0] == 0) {
firstColZero = true;
break;
}
}
for(int i = 1; i < rows; i++){
for(int j = 1; j < cols; j++){
if (matrix[i][j] == 0){
matrix[i][0] = 0;
matrix[0][j] = 0;
}
}
}
for(int i = 1; i < rows; i++){
if(matrix[i][0] == 0){
for(int j = 1; j < cols; j++){
matrix[i][j] = 0;
}
}
}
for(int j = 1; j < cols; j++){
if(matrix[0][j] == 0) {
for(int i = 1; i < rows; i++){
matrix[i][j] = 0;
}
}
}
if(firstRowZero){
for(int j = 0; j < cols; j++){
matrix[0][j] = 0;
}
}
if(firstColZero){
for(int i = 0; i < rows; i++){
matrix[i][0] = 0;
}
}
}
}