package Q1_08_Zero_Matrix;
import CtCILibrary.AssortedMethods;
public class QuestionB {
public static void nullifyRow(int[][] matrix, int row) {
for (int j = 0; j < matrix[0].length; j++) {
matrix[row][j] = 0;
}
}
public static void nullifyColumn(int[][] matrix, int col) {
for (int i = 0; i < matrix.length; i++) {
matrix[i][col] = 0;
}
}
public static void setZeros(int[][] matrix) {
boolean rowHasZero = false;
boolean colHasZero = false;
// Check if first row has a zero
for (int j = 0; j < matrix[0].length; j++) {
if (matrix[0][j] == 0) {
rowHasZero = true;
break;
}
}
// Check if first column has a zero
for (int i = 0; i < matrix.length; i++) {
if (matrix[i][0] == 0) {
colHasZero = true;
break;
}
}
// Check for zeros in the rest of the array
for (int i = 1; i < matrix.length; i++) {
for (int j = 1; j < matrix[0].length;j++) {
if (matrix[i][j] == 0) {
matrix[i][0] = 0;
matrix[0][j] = 0;
}
}
}
// Nullify rows based on values in first column
for (int i = 1; i < matrix.length; i++) {
if (matrix[i][0] == 0) {
nullifyRow(matrix, i);
}
}
// Nullify columns based on values in first row
for (int j = 1; j < matrix[0].length; j++) {
if (matrix[0][j] == 0) {
nullifyColumn(matrix, j);
}
}
// Nullify first row
if (rowHasZero) {
nullifyRow(matrix, 0);
}
// Nullify first column
if (colHasZero) {
nullifyColumn(matrix, 0);
}
}
public static boolean matricesAreEqual(int[][] m1, int[][] m2) {
if (m1.length != m2.length || m1[0].length != m2[0].length) {
return false;
}
for (int k = 0; k < m1.length; k++) {
for (int j = 0; j < m1[0].length; j++) {
if (m1[k][j] != m2[k][j]) {
return false;
}
}
}
return true;
}
public static int[][] cloneMatrix(int[][] matrix) {
int[][] c = new int[matrix.length][matrix[0].length];
for (int i = 0; i < matrix.length; i++) {
for (int j = 0; j < matrix[0].length; j++) {
c[i][j] = matrix[i][j];
}
}
return c;
}
public static void main(String[] args) {
int nrows = 10;
int ncols = 15;
int[][] matrix = AssortedMethods.randomMatrix(nrows, ncols, -10, 10);
AssortedMethods.printMatrix(matrix);
setZeros(matrix);
System.out.println();
AssortedMethods.printMatrix(matrix);
}
}