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github-actions 2021-09-20 18:50:09 +00:00
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commit e72d71c0d7
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93
Others/RotateMatriceBy90Degree.java
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@ -1,71 +1,60 @@
package Others; package Others;
/** /**
* Given a matrix of size n x n * Given a matrix of size n x n We have to rotate this matrix by 90 Degree Here is the algorithm for
* We have to rotate this matrix by 90 Degree * this problem .
* Here is the algorithm for this problem .
*
*/ */
import java.util.*; import java.util.*;
class Rotate_by_90_degree { class Rotate_by_90_degree {
public static void main(String[] args) { public static void main(String[] args) {
Scanner sc = new Scanner(System.in); Scanner sc = new Scanner(System.in);
int t = sc.nextInt(); int t = sc.nextInt();
while (t-- > 0) { while (t-- > 0) {
int n = sc.nextInt(); int n = sc.nextInt();
int[][] arr = new int[n][n]; int[][] arr = new int[n][n];
for (int i = 0; i < n; i++) for (int i = 0; i < n; i++) for (int j = 0; j < n; j++) arr[i][j] = sc.nextInt();
for (int j = 0; j < n; j++)
arr[i][j] = sc.nextInt();
Rotate g = new Rotate(); Rotate g = new Rotate();
g.rotate(arr); g.rotate(arr);
printMatrix(arr); printMatrix(arr);
}
sc.close();
} }
sc.close();
}
static void printMatrix(int arr[][]) { static void printMatrix(int arr[][]) {
for (int i = 0; i < arr.length; i++) { for (int i = 0; i < arr.length; i++) {
for (int j = 0; j < arr[0].length; j++) for (int j = 0; j < arr[0].length; j++) System.out.print(arr[i][j] + " ");
System.out.print(arr[i][j] + " "); System.out.println("");
System.out.println("");
}
} }
}
} }
/** /** Class containing the algo to roate matrix by 90 degree */
* Class containing the algo to roate matrix by 90 degree
*/
class Rotate { class Rotate {
static void rotate(int a[][]) { static void rotate(int a[][]) {
int n = a.length; int n = a.length;
for (int i = 0; i < n; i++) { for (int i = 0; i < n; i++) {
for (int j = 0; j < n; j++) { for (int j = 0; j < n; j++) {
if (i > j) { if (i > j) {
int temp = a[i][j]; int temp = a[i][j];
a[i][j] = a[j][i]; a[i][j] = a[j][i];
a[j][i] = temp; a[j][i] = temp;
}
}
} }
int i = 0, k = n - 1; }
while (i < k) {
for (int j = 0; j < n; j++) {
int temp = a[i][j];
a[i][j] = a[k][j];
a[k][j] = temp;
}
i++;
k--;
}
} }
int i = 0, k = n - 1;
while (i < k) {
for (int j = 0; j < n; j++) {
int temp = a[i][j];
a[i][j] = a[k][j];
a[k][j] = temp;
}
i++;
k--;
}
}
} }