text: Title: I have a better way to solve exercise 89
  Body: I think
  
  ```
  print(np.sort(Z)[-n:])
  ```
  
  or
  
  ```
  Z.sort()
  print(Z[-n:])
  ```
  
  would be better than
  
  https://github.com/rougier/numpy-100/blob/916e1ecf9544719b49ece6fc135b089988b33058/100_Numpy_exercises_with_hints_with_solutions.md#L1084
  
  because the first solution is simpler, and if it's ok to modify the array in place, the second solution is faster and uses less space.