input: from typing import List
  
  def types_of_parameters(class_name: str, methods: List[str], variables: List[str]) -> List[str]:
      """Given a class name and lists of its methods' names and its instance variables' names,
      determine and return a list of strings where each string has the format:
      "<method_name> -> [param_type, param_type, ...]"
      and "<variable_name> -> type".
      Each method in the provided list should have at least one parameter.
      Ensure to account for different types of parameters (self, title, artist, other)
      as needed based on the method logic.
      
      >>> types_of_parameters("Song", ["__init__", "__str__", "__eq__", "length"], ["title", "artist"])
      ["__init__ -> [str, str]", "__str__ -> []", "__eq__ -> [Song]", "length -> []", "title -> str", "artist -> str"]
      """
output:     result = []
      for method in methods:
          if method == "__init__":
              result.append(f"{method} -> [str, str]")
          elif method == "__str__" or method == "length":
              result.append(f"{method} -> []")
          elif method == "__eq__":
              result.append(f"{method} -> [Song]")
      
      for variable in variables:
          result.append(f"{variable} -> str")
      
      return result