code: 
  
  
  
  
  
  
  from __future__ import annotations
  
  
  def 						_A     (       SCREAMING_SNAKE_CASE__						:			List[str]  ,						SCREAMING_SNAKE_CASE__						:			Dict ):
  				assert len(SCREAMING_SNAKE_CASE__ ) == len(SCREAMING_SNAKE_CASE__ )
  
  				UpperCamelCase :str										=     len(SCREAMING_SNAKE_CASE__ )
  				UpperCamelCase :Any										=     list(range(SCREAMING_SNAKE_CASE__ ) )
  				UpperCamelCase :Tuple										=     [-1] * n  # who the donor has donated to
  				UpperCamelCase :Any										=     [-1] * n  # who the recipient has received from
  				UpperCamelCase :int										=     [0] * n
  
  				while unmatched_donors:
  								UpperCamelCase :Optional[Any]										=     unmatched_donors[0]
  								UpperCamelCase :str										=     donor_pref[donor]
  								UpperCamelCase :List[Any]										=     donor_preference[num_donations[donor]]
  								num_donations[donor] += 1
  								UpperCamelCase :Union[str, Any]										=     recipient_pref[recipient]
  								UpperCamelCase :Optional[Any]										=     rec_record[recipient]
  
  								if prev_donor != -1:
  												if rec_preference.index(SCREAMING_SNAKE_CASE__ ) > rec_preference.index(SCREAMING_SNAKE_CASE__ ):
  																UpperCamelCase :Optional[Any]										=     donor
  																UpperCamelCase :int										=     recipient
  																unmatched_donors.append(SCREAMING_SNAKE_CASE__ )
  																unmatched_donors.remove(SCREAMING_SNAKE_CASE__ )
  								else:
  												UpperCamelCase :Union[str, Any]										=     donor
  												UpperCamelCase :str										=     recipient
  												unmatched_donors.remove(SCREAMING_SNAKE_CASE__ )
  				return donor_record
  
  
  
  
  
  
style_context: 
  
  
  
  
  
  
  from __future__ import annotations
  
  
  
  
  
  
  
  class     UpperCAmelCase_		:
  
  
  
        """simple docstring"""
        def __init__(       self					,       SCREAMING_SNAKE_CASE_				)       ->   None:
            UpperCamelCase :Tuple										=     value
            UpperCamelCase :Node | None										=     None
            UpperCamelCase :Node | None										=     None
  
  
  
  
  
  
  
  class     UpperCAmelCase_		:
  
  
  
        """simple docstring"""
        UpperCamelCase_       :      int
        def __init__(       self				)       ->   None:
            UpperCamelCase :List[Any]										=     0
        def 					UpperCAmelCase		(       self					,       SCREAMING_SNAKE_CASE_					,       SCREAMING_SNAKE_CASE_				)       ->   None:
            if node is None:
                return
  
            if path_sum == self.target:
                self.paths += 1
  
            if node.left:
                self.depth_first_search(node.left					,       path_sum + node.left.value				)
            if node.right:
                self.depth_first_search(node.right					,       path_sum + node.right.value				)
  
  
  
  
        def 					UpperCAmelCase		(       self					,       SCREAMING_SNAKE_CASE_					,       SCREAMING_SNAKE_CASE_ = None				)       ->   int:
            if node is None:
                return 0
            if target is not None:
                UpperCamelCase :Tuple										=     target
  
            self.depth_first_search(SCREAMING_SNAKE_CASE_					,       node.value				)
            self.path_sum(node.left				)
            self.path_sum(node.right				)
  
            return self.paths
  
  
  if __name__ == "__main__":
   import doctest
  
   doctest.testmod()
  
  
  
  
  
  