Pythonで最も深い葉の最も低い共通の祖先

理解を深めるために、次の実装を見てみましょう-

class TreeNode:
   def __init__(self, data, left = None, right = None):
      self.data = data
      self.left = left
      self.right = right
def insert(temp,data):
   que = []
   que.append(temp)
   while (len(que)):
      temp = que[0]
      que.pop(0)
      if (not temp.left):
         if data is not None:
            temp.left = TreeNode(data)
         else:
            temp.left = TreeNode(0)
         break
      else:
         que.append(temp.left)
      if (not temp.right):
         if data is not None:
            temp.right = TreeNode(data)
         else:
            temp.right = TreeNode(0)
         break
      else:
         que.append(temp.right)
def make_tree(elements):
   Tree = TreeNode(elements[0])
   for element in elements[1:]:
      insert(Tree, element)
   return Tree
def print_tree(root):
   #print using inorder traversal
   if root is not None:
      print_tree(root.left)
      print(root.data, end = ', ')
      print_tree(root.right)
class Solution(object):
   def lcaDeepestLeaves(self, root):
      return self.solve(root)[1]
   def solve(self,node):
      if not node:
         return [0,None]
      if not node.left and not node.right:
         return [1,node]
      d1,l = self.solve(node.left)
      d2,r = self.solve(node.right)
      if d1>d2:
         return [d1+1,l]
      elif d2>d1:
         return [d2+1,r]
      return [d1+1,node]
ob = Solution()
root = make_tree([1,2,3,4,5])
print_tree(ob.lcaDeepestLeaves(root))

入力

[1,2,3,4,5]

出力

4, 2, 5,