http://www.geeksforgeeks.org/connect-nodes-at-same-level-with-o1-extra-space/ recursive: #include <iostream> #include <vector> #include <algorithm> #include <queue> #include <stack> #include <string> #include <fstrea…

http://www.geeksforgeeks.org/populate-inorder-successor-for-all-nodes/ #include <iostream> #include <vector> #include <algorithm> #include <queue> #include <stack> #include <string> #include <fstream> using namesp…

http://www.geeksforgeeks.org/lowest-common-ancestor-binary-tree-set-1/ #include <iostream> #include <vector> #include <algorithm> #include <queue> #include <stack> #include <string> #include <fstream> #include <…

http://www.geeksforgeeks.org/print-ancestors-of-a-given-binary-tree-node-without-recursion/ #include <iostream> #include <vector> #include <algorithm> #include <queue> #include <stack> #include <string> #include <fst…

http://www.geeksforgeeks.org/in-place-convert-a-given-binary-tree-to-doubly-linked-list/ #include <iostream> #include <vector> #include <algorithm> #include <queue> #include <stack> #include <string> #include <fstrea…

http://www.geeksforgeeks.org/iterative-postorder-traversal-using-stack/ #include <iostream> #include <vector> #include <algorithm> #include <queue> #include <stack> #include <string> #include <fstream> #include &l…

http://www.geeksforgeeks.org/largest-independent-set-problem/ #include <iostream> #include <vector> #include <algorithm> #include <queue> #include <stack> #include <string> #include <fstream> #include <map>…

http://www.geeksforgeeks.org/morris-traversal-for-preorder/ #include <iostream> #include <vector> #include <algorithm> #include <queue> #include <stack> #include <string> #include <fstream> #include <map> us…

http://www.geeksforgeeks.org/full-and-complete-binary-tree-from-given-preorder-and-postorder-traversals/ #include <iostream> #include <vector> #include <algorithm> #include <queue> #include <stack> #include <string> #in…

http://www.geeksforgeeks.org/boundary-traversal-of-binary-tree/ #include <iostream> #include <vector> #include <algorithm> #include <queue> #include <stack> #include <string> #include <fstream> #include <map>…

http://www.geeksforgeeks.org/convert-a-given-tree-to-sum-tree/ #include <iostream> #include <vector> #include <algorithm> #include <queue> #include <stack> #include <string> #include <fstream> using namespace std;…

http://www.geeksforgeeks.org/check-if-a-given-binary-tree-is-sumtree/ #include <iostream> #include <vector> #include <algorithm> #include <queue> #include <stack> #include <string> #include <fstream> using namespa…

http://www.geeksforgeeks.org/construct-tree-from-given-inorder-and-preorder-traversal/ #include <iostream> #include <vector> #include <algorithm> #include <queue> #include <stack> #include <string> #include <fstream&…

http://www.geeksforgeeks.org/inorder-tree-traversal-without-recursion-and-without-stack/ #include <iostream> #include <vector> #include <algorithm> #include <queue> #include <stack> #include <string> #include <fstrea…

http://www.geeksforgeeks.org/inorder-tree-traversal-without-recursion/ #include <iostream> #include <vector> #include <algorithm> #include <queue> #include <stack> using namespace std; struct node { int data; struct node *lef…

http://www.geeksforgeeks.org/how-to-determine-if-a-binary-tree-is-balanced/ #include <iostream> #include <vector> #include <algorithm> #include <queue> #include <stack> using namespace std; struct node { int data; struct node…

http://www.geeksforgeeks.org/diameter-of-a-binary-tree/ #include <iostream> #include <vector> #include <algorithm> #include <queue> #include <stack> using namespace std; struct node { int data; struct node *left, *right; node…

http://www.geeksforgeeks.org/convert-an-arbitrary-binary-tree-to-a-tree-that-holds-children-sum-property/ #include <iostream> #include <vector> #include <algorithm> #include <queue> #include <stack> using namespace std; struc…

http://www.geeksforgeeks.org/check-for-children-sum-property-in-a-binary-tree/ #include <iostream> #include <vector> #include <algorithm> #include <queue> #include <stack> using namespace std; struct node { int data; struct n…

http://www.geeksforgeeks.org/level-order-traversal-in-spiral-form/ #include <iostream> #include <vector> #include <algorithm> #include <queue> #include <stack> using namespace std; struct node { int data; struct node *left, *…

http://www.geeksforgeeks.org/find-k-th-smallest-element-in-bst-order-statistics-in-bst/ #include <iostream> #include <vector> #include <algorithm> #include <queue> #include <stack> #include <string> #include <fstream…

struct node { int val; node *left; node *right; node *parent; node() : val(), left(NULL), right(NULL) { } node(int v) : val(v), left(NULL), right(NULL) { } }; node* insert(int n, node *root) { if (root == NULL) { root = new node(n); return root; } if…

题目大意 https://leetcode.com/problems/binary-tree-inorder-traversal/description/ 94. Binary Tree Inorder Traversal Given a binary tree, return the inorder traversal of its nodes' values. Example: Input: [1,null,2,3] 1 \ 2 / 3 Output: [1,3,2] Follow up:…

Follow up for problem "Populating Next Right Pointers in Each Node". What if the given tree could be any binary tree? Would your previous solution still work? Note: You may only use constant extra space. For example, Given the following binary t…

https://www.geeksforgeeks.org/bfs-vs-dfs-binary-tree/ What are BFS and DFS for Binary Tree? A Tree is typically traversed in two ways: Breadth First Traversal (Or Level Order Traversal) Depth First Traversals Inorder Traversal (Left-Root-Right) Preor…

题目: Given a binary tree, imagine yourself standing on the right side of it, return the values of the nodes you can see ordered from top to bottom. For example:Given the following binary tree, 1 <--- / \ 2 3 <--- \ \ 5 4 <--- You should return [1,…

Description: Suppose that all the keys in a binary tree are distinct positive integers. Given the postorder and inorder traversal sequences, a binary tree can be uniquely determined. Now given a sequence of statements about the structure of the resul…

# 树结构 from pythonds.basic.stack import Stack #pip install pythonds from pythonds.trees.binaryTree import BinaryTree from collections import defaultdict import json #JSON-esque def tree(): return defaultdict(tree) def dicts(t): return {k: dicts(t[k])…

In a tree, nodes have a single parent node and may have many children nodes. They never have more than one parent nor point to any siblings. The most common tree structure you see is a web page. The underlying structure is often called the "DOM tree&…

题外话:考试的时候花了一个小时做了27分,由于Siblings这个单词不知道意思,所以剩下的3分就没去纠结了,后来发现单词是兄弟的意思,气哭~~ 这道题的麻烦之处在于如何从一个字符串中去找数字.先首先我们需要整行读取(包括空格),这个我自己写另一个函数,挺好用的: string mygets() { ]; fgets(str,sizeof(str),stdin); int len = strlen(str); ]==] = '\0'; return str; } 用的时候只要 string st…