发简信
IP属地：艾奥瓦州
-
Top down/Bottom up in Tree
下一个目标是弄清楚：Top down和Bottom up 理解：Bottom up - 是指不到最下面的叶节点，不会return（触底后反弹 -...
-
Binary Tree *Level* Order Traversal - 637. Average of Levels in Binary Tree
题目地址典型的BFS了，只需要在遍历当前层级的时候记录下结点个数和值的累加和就好了。 注意new后面的具体数据类型：List<Double> =...
-
BFS and DFS for traversing a Tree最近刷关于Tree的题遇到了不少用BFS/DFS解决的问题，鉴于自己对概念一知半解，翻出之前一个朋友推荐过的文章学习一下。原文地址：https:...
-
双端队列Deque「转」双端队列Deque「转」 头部尾部操作语句不同：https://zh.wikipedia.org/wiki/%E5%8F%8C%E7%AB%AF...
-
isValidBST & Balanced binary Tree
isValidBST public boolean isValidBST(TreeNode root) {return valid(root, ...
-
501. Find Mode in Binary Search Tree
题目Given a binary search tree (BST) with duplicates, find all the mode(s)...
-
CSV module in Python
https://docs.python.org/3/library/csv.html 这段代码批量给.csv文件加上headers(thanks...
-
617. Merge Two Binary Trees
For Tree 3, its each node's val is the sum(TreeNode t1 + TreeNode t2) in...
-
pathSum - leetcode
pathSum 1 Given a binary tree and a sum, determine if the tree has a roo...