摘要：
1、复制带随机指针的链表 class Solution(object): def copyRandomList(self, head): """ :type head: Node :rtype: Node """ if head is None: return None p = head while 阅读全文
摘要：
1、二叉树后序遍历 class Solution(object): def postorderTraversal(self, root): """ :type root: TreeNode :rtype: List[int] """ res = [] def helper(root): if not 阅读全文