code: def is_valid_array(array, events, slots):
      
  
      if len(array) == 0:
          return False
      violations = sum(1 for c in (array_violations(array, events, slots)))
      return violations == 0
docs: Take a schedule in array form and return whether it is a valid
      solution for the given constraints
  
      Parameters
      ----------
          array : np.array
              a schedule in array form
          events : list or tuple
              of resources.Event instances
          slots : list or tuple
              of resources.Slot instances
  
      Returns
      -------
          bool
              True if array represents a valid solution