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Create SetMatrixZeros.java #475

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91 changes: 91 additions & 0 deletions CP/SetMatrixZeros.java
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Original file line number Diff line number Diff line change
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package Java_DSA.Problems.Matrix;
import java.io.*;
import java.util.* ;

public class SetMatrixZeros {
public static void setZeros(int[][] matrix) {
// Write your code here..

// int m=matrix.length, n=matrix[0].length;
// boolean isRow0=false, isCol0=false;

// for(int j=0;j<n;j++){
// if(matrix[0][j]==0)
// isRow0=true;
// }

// for(int i=0;i<m;i++){
// if(matrix[i][0]==0)
// isCol0=true;
// }

// for(int i=1;i<m;i++){
// for(int j=1;j<n;j++){
// if(matrix[i][j]==0){
// matrix[i][0]=0;
// matrix[0][j]=0;
// }
// }
// }

// for(int i=1;i<m;i++){
// for(int j=1;j<n;j++){
// if(matrix[0][j]==0 || matrix[i][0]==0)
// matrix[i][j]=0;
// }
// }

// if(isRow0){
// for(int j=0;j<n;j++)
// matrix[0][j]=0;
// }

// if(isCol0){
// for(int i=0;i<m;i++)
// matrix[i][0]=0;
// }
int m=matrix.length, n=matrix[0].length;
int[] rowsArray = new int[m];
int[] colsArray = new int[n];

Arrays.fill(rowsArray,1);
Arrays.fill(colsArray,1);

for(int i=0;i<m;i++){
for(int j=0;j<n;j++){
if(matrix[i][j]==0){
rowsArray[i]=0;
colsArray[j]=0;
}
}
}

for(int i=0;i<m;i++){
for(int j=0;j<n;j++){
if(rowsArray[i]==0 || colsArray[j]==0)
matrix[i][j]=0;
}
}
}

public static void main(String[] args) {
int[][] matrix = {{4,2,3}
,{1,0,3}
,{1,2,3}};
setZeros(matrix);

for(int i = 0;i < matrix.length;i++){
for(int j = 0;j < matrix[0].length;j++){
System.out.print(matrix[i][j]+ " ");
}
System.out.println();
}

// for (int[] element : matrix) {
// for (int j = 0; j < matrix[0].length; j++) {
// System.out.print(element[j] + " ");
// }
// System.out.println();
// }
}
}