message: Update maximum-xor-of-two-non-overlapping-subtrees.py
diff: # Time: O(nlogr), r is sum(values)
  # Space: O(n)
  -# iterative dfs, trie
  +# iterative dfs, trie, greedy
  class Trie(object):
  def __init__(self, bit_length):
  self.__root = {}
  @@ -86,7 +86,7 @@ class Solution(object):
  # Time: O(nlogr), r is sum(values)
  # Space: O(n)
  -# dfs, trie
  +# dfs, trie, greedy
  class Trie(object):
  def __init__(self, bit_length):
  self.__root = {}
  