public static int[] arrayLeftRotation(int[] a, int n, int k) {
      int[] b = new int[n];
        for(int i=0;i<n-k;i++){
            b[i] = a[k+i];
        }
       int l = 0;
        for(int i=n-k;i<n;i++){
            b[i] = a[l++];
        }
       return b; 
        
        
    }