在Python中实现二进制搜索树(Binary Search Tree, BST)的删除操作时,可能会遇到以下问题:
class TreeNode:
def __init__(self, val):
self.val = val
self.left = None
self.right = None
def deleteNode(root, key):
if not root:
return root
if key < root.val:
root.left = deleteNode(root.left, key)
elif key > root.val:
root.right = deleteNode(root.right, key)
else:
if not root.left:
return root.right
elif not root.right:
return root.left
else:
successor = findSuccessor(root.right)
root.val = successor.val
root.right = deleteNode(root.right, successor.val)
return root
def findSuccessor(node):
while node.left:
node = node.left
return node
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