how to rotate a matrix 90 degrees clockwise
int n=A.size();
for(int i=0;i<n/2;i++){
for(int j=i;j<n-i-1;j++){
int temp=A[i][j];
A[i][j]=A[n-1-j][i];
A[n-1-j][i]=A[n-1-i][n-1-j];
A[n-1-i][n-1-j]=A[j][n-1-i];
A[j][n-1-i]=temp;
}
}rotate matrix 90 degrees clockwise
package Arrays;
import java.util.Arrays;
public class RotateMatrix {
static int[][] rotate(int[][] matrix) {
int rows = matrix.length;
int cols = matrix[0].length;
int[][] ans = new int[rows][cols];
for (int i = 0; i < rows; i++) {
for (int j = 0; j < cols; j++) {
ans[i][j] = matrix[j][i];
}
reverse(ans[i]);
}
return ans;
}
static void reverse(int[] arr) {
for (int i = 0; i < arr.length/2; i++) {
int temp = arr[i];
arr[i] = arr[arr.length-i-1];
arr[arr.length-i-1] = temp;
}
}
public static void main(String[] args) {
int[][] nums = {{1, 2, 3},{4, 5, 6}, {7, 8,9}};
System.out.println(Arrays.deepToString(rotate(nums)));
}
}Copyright © 2021 Codeinu
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