cc150_1.6

Given an image represented by an NxN matrix, where each pixel in the image is
4 bytes, write a method to rotate the image by 90 degrees. Can you do this in
place?

public void rotate(int[][] matrix, int n){
  for(int i = 0; i < n/2; i++){
   for(int j = i; j < n-1-i; j++){
      int tmp = matrix[i][j];
      matrix[i][j] = matrix[j][n-i-1];
      matrix[j][n-i-1] = matrix[n-i-1][n-j-1];
      matrix[n-i-1][n-j-1] = matrix[n-j-1][i];
      matrix[n-j-1][i] = matrix[i][j];
    }
  }
}