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Title: LintCode/KnowledgeHash.md at master · linux2Java/LintCode · GitHub

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Description: Java Solutions to problems on LintCode/LeetCode. Contribute to linux2Java/LintCode development by creating an account on GitHub.

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	https://github.com/linux2Java/LintCode/commits/master/KnowledgeHash.md
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	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#table-of-contents
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StringBuffer	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#stringbuffer
其他	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E5%85%B6%E4%BB%96
Hash Table	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#hash-table
HashTable	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#hashtable
HashSet	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#hashset
HashMap	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#hashmap
Heap	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#heap
Insert	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#insert
Extract Minimum Element	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#extract-minimum-element
如何想到用 Min/Max Heap	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E5%A6%82%E4%BD%95%E6%83%B3%E5%88%B0%E7%94%A8-minmax-heap
Example	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#example
Stack	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#stack
Functions	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#functions-1
基本用法	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E5%9F%BA%E6%9C%AC%E7%94%A8%E6%B3%95
Monotonous Stack	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#monotonous-stack
Example	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#example-1
Queue	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#queue
Functions	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#functions-2
Linked List	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#linked-list
考法	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E8%80%83%E6%B3%95
Tree	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#tree
Binary Search Tree	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#binary-search-tree
TreeSet	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#treeset
Traversal	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#traversal
Binary Tree	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#binary-tree
Type of Tree	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#type-of-tree
Balanced bianry tree	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#balanced-bianry-tree
Complete binary tree	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#complete-binary-tree
Full Binary Tree	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#full-binary-tree
Perfect Binary Tree	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#perfect-binary-tree
Binary Tree Traversal	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#binary-tree-traversal
Inorder Traversal	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#inorder-traversal
Expression Tree	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#expression-tree
Example	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#example-2
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Trie	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#trie
用法/考点	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E7%94%A8%E6%B3%95%E8%80%83%E7%82%B9
Compare with HashMap	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#compare-with-hashmap
Code Model/ Sample Functions	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#code-model-sample-functions
Binary Indexed Tree	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#binary-indexed-tree
Segment Tree	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#segment-tree
基本知识	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E5%9F%BA%E6%9C%AC%E7%9F%A5%E8%AF%86
functions	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#functions-3
用法	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E7%94%A8%E6%B3%95
Red Black Tree	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#red-black-tree
基本知识	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E5%9F%BA%E6%9C%AC%E7%9F%A5%E8%AF%86-1
特点	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E7%89%B9%E7%82%B9
引申特点	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E5%BC%95%E7%94%B3%E7%89%B9%E7%82%B9
用法	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E7%94%A8%E6%B3%95-1
B-Tree	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#b-tree
基本知识	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E5%9F%BA%E6%9C%AC%E7%9F%A5%E8%AF%86-2
AVL Tree	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#avl-tree
基本知识	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E5%9F%BA%E6%9C%AC%E7%9F%A5%E8%AF%86-3
更多细节特点	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E6%9B%B4%E5%A4%9A%E7%BB%86%E8%8A%82%E7%89%B9%E7%82%B9
用途	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E7%94%A8%E9%80%94
优点	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E4%BC%98%E7%82%B9
Graph	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#graph
Popular algorithms	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#popular-algorithms
Adjacency List	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#adjacency-list
Example	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#example-3
构建Graph	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E6%9E%84%E5%BB%BAgraph
Adjacency Matrices	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#adjacency-matrices
Graph Search	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#graph-search
DFS	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#dfs
BFS	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#bfs
Bidirectional Search	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#bidirectional-search
Deque	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#deque
Union Find	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#union-find
UnionFind基础操作	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#unionfind%E5%9F%BA%E7%A1%80%E6%93%8D%E4%BD%9C
UnionFind follow up	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#unionfind-follow-up
Topological Sort	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#topological-sort
建立Graph InDegree	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E5%BB%BA%E7%AB%8Bgraph--indegree
Topological Sort - BFS	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#topological-sort---bfs
Topological Sort - DFS	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#topological-sort---dfs
Two Pointers	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#two-pointers
Binary Search	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#binary-search
Template	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#template
中二思想	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E4%B8%AD%E4%BA%8C%E6%80%9D%E6%83%B3
Sort	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#sort
常用	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E5%B8%B8%E7%94%A8
Merge Sort	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#merge-sort
Heap Sort	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#heap-sort
Quick Sort	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#quick-sort
Quick Select	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#quick-select
Bucket Sort	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#bucket-sort
Comparator for Arrays, Collections	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#comparator-for-arrays-collections
DP	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#dp
判断	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E5%88%A4%E6%96%AD
四个步骤:	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E5%9B%9B%E4%B8%AA%E6%AD%A5%E9%AA%A4
确定状态	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E7%A1%AE%E5%AE%9A%E7%8A%B6%E6%80%81
转移方程	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E8%BD%AC%E7%A7%BB%E6%96%B9%E7%A8%8B
初始条件/边界情况	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E5%88%9D%E5%A7%8B%E6%9D%A1%E4%BB%B6%E8%BE%B9%E7%95%8C%E6%83%85%E5%86%B5
计算顺序	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E8%AE%A1%E7%AE%97%E9%A1%BA%E5%BA%8F
Technique	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#technique
基本原理	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E5%9F%BA%E6%9C%AC%E5%8E%9F%E7%90%86
分类	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E5%88%86%E7%B1%BB
网格坐标	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E7%BD%91%E6%A0%BC%E5%9D%90%E6%A0%87
特殊	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E7%89%B9%E6%AE%8A
序列	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E5%BA%8F%E5%88%97
特点	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E7%89%B9%E7%82%B9-1
性质	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E6%80%A7%E8%B4%A8
特点	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E7%89%B9%E7%82%B9-2
关键点	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E5%85%B3%E9%94%AE%E7%82%B9
序列加状态	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E5%BA%8F%E5%88%97%E5%8A%A0%E7%8A%B6%E6%80%81
划分	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E5%88%92%E5%88%86
性质	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E6%80%A7%E8%B4%A8-1
经验	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E7%BB%8F%E9%AA%8C
解决方法	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E8%A7%A3%E5%86%B3%E6%96%B9%E6%B3%95
博弈类	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E5%8D%9A%E5%BC%88%E7%B1%BB
背包类	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E8%83%8C%E5%8C%85%E7%B1%BB
多种问法	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E5%A4%9A%E7%A7%8D%E9%97%AE%E6%B3%95
方法策略	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E6%96%B9%E6%B3%95%E7%AD%96%E7%95%A5
放入的物品没有顺序	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E6%94%BE%E5%85%A5%E7%9A%84%E7%89%A9%E5%93%81%E6%B2%A1%E6%9C%89%E9%A1%BA%E5%BA%8F
区间类(Interval DP)	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E5%8C%BA%E9%97%B4%E7%B1%BBinterval-dp
特点	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E7%89%B9%E7%82%B9-3
三把斧	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E4%B8%89%E6%8A%8A%E6%96%A7
难点	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E9%9A%BE%E7%82%B9
Bitwise Operation DP	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#bitwise-operation-dp
优化	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E4%BC%98%E5%8C%96
Minimax/MaxiMin	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#minimaxmaximin
Optimization problems	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#optimization-problems
Double Sequence	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#double-sequence
存状态	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E5%AD%98%E7%8A%B6%E6%80%81
记忆化搜索 Memoization DP	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E8%AE%B0%E5%BF%86%E5%8C%96%E6%90%9C%E7%B4%A2-memoization-dp
什么时候用记忆化搜索	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E4%BB%80%E4%B9%88%E6%97%B6%E5%80%99%E7%94%A8%E8%AE%B0%E5%BF%86%E5%8C%96%E6%90%9C%E7%B4%A2
特点	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E7%89%B9%E7%82%B9-4
缺点	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E7%BC%BA%E7%82%B9
时间空间复杂度的节省	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E6%97%B6%E9%97%B4%E7%A9%BA%E9%97%B4%E5%A4%8D%E6%9D%82%E5%BA%A6%E7%9A%84%E8%8A%82%E7%9C%81
Search	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#search
Breadth-first Search	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#breadth-first-search
Depth-first Search	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#depth-first-search
for loop dfs vs. pick&&skip dfs	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#for-loop-dfs-vs-pickskip-dfs
void dfs	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#void-dfs
object dfs	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#object-dfs
Regular Premitives	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#regular-premitives
Customized Object	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#customized-object
Tree DFS	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#tree-dfs
Combinatorics	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#combinatorics
DFS 思想	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#dfs-%E6%80%9D%E6%83%B3
DFS 注意	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#dfs-%E6%B3%A8%E6%84%8F
Permutation	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#permutation
原理	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E5%8E%9F%E7%90%86
Backtracking DFS (Recursive)	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#backtracking-dfs-recursive
插入法 (iterative)	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E6%8F%92%E5%85%A5%E6%B3%95-iterative
Sweep Line	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#sweep-line
Backtracking	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#backtracking
Greedy	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#greedy
When to use	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#when-to-use
Examples	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#examples
Reservoir Sampling	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#reservoir-sampling
Geometry	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#geometry
Approach	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#approach
遇到Array	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E9%81%87%E5%88%B0array
遇到需要排序	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E9%81%87%E5%88%B0%E9%9C%80%E8%A6%81%E6%8E%92%E5%BA%8F
Divide and Conquer	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#divide-and-conquer
Recursion	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#recursion
特征	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E7%89%B9%E5%BE%81
Other minor problem sets	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#other-minor-problem-sets
回文串 Palindrome	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#%E5%9B%9E%E6%96%87%E4%B8%B2-palindrome
Windows Problem	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#windows-problem
Collections Functions	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#collections-functions
methods	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#methods
ArrayList	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#arraylist
CS Basics	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#cs-basics
BigO Specials	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#bigo-specials
Time Complexity of graph/dfs block	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#time-complexity-of-graphdfs-block
Sum, PrefixSum	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#sum-prefixsum
Math	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#math
Math Functions	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#math-functions
Numbers	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#numbers
Probability theory	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#probability-theory
Combinatorics	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#combinatorics-1
subset time&&space	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#subset-timespace
Brainteaser	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#brainteaser
Operating system	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#operating-system
Threads	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#threads
Two approaches	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#two-approaches
Bit Manipulation	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#bit-manipulation
Memory	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#memory
Java Garbage Collections	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#java-garbage-collections
Heap	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#heap-1
Garbage Collection Roots	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#garbage-collection-roots
Example	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#example-4
Marking and Sweeping Carbage	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#marking-and-sweeping-carbage
Pain Point	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#pain-point
NP-Complete problems	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#np-complete-problems
wiki	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#wiki
Knapsack	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#knapsack
Travelling salesman	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#travelling-salesman
Basics	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#basics
Edge case	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#edge-case
Advanced	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#advanced
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#array
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#honorable-problems
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#string
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#functions
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#stringbuffer
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#其他
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#hash-table
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#hashtable
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#hashset
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#hashmap
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#heap
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#insert
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#extract-minimum-element
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#如何想到用-minmax-heap
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#example
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#stack
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#functions-1
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#基本用法
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#monotonous-stack
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#example-1
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#queue
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#functions-2
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#linked-list
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#考法
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#tree
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#binary-search-tree
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#treeset
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#traversal
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#binary-tree
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#type-of-tree
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#balanced-bianry-tree
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#complete-binary-tree
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#full-binary-tree
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#perfect-binary-tree
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#binary-tree-traversal
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#inorder-traversal
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#expression-tree
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#example-2
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#build-tree
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#trie
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#用法考点
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#compare-with-hashmap
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#code-model-sample-functions
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#binary-indexed-tree
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#segment-tree
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#基本知识
https://en.wikipedia.org/wiki/Segment_tree	https://en.wikipedia.org/wiki/Segment_tree
https://en.wikipedia.org/wiki/Interval_tree	https://en.wikipedia.org/wiki/Interval_tree
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#functions-3
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#用法
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#red-black-tree
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#基本知识-1
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#特点
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#引申特点
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#用法-1
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#b-tree
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#基本知识-2
https://en.wikipedia.org/wiki/B-tree	https://en.wikipedia.org/wiki/B-tree
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#avl-tree
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#基本知识-3
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#更多细节特点
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#用途
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#优点
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#graph
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#popular-algorithms
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#adjacency-list
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#example-3
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#构建graph
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#adjacency-matrices
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#graph-search
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#dfs
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#bfs
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#bidirectional-search
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#deque
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#union-find
https://en.wikipedia.org/wiki/Proof_of_O(log*n)_time_complexity_of_union%E2%80%93find	https://en.wikipedia.org/wiki/Proof_of_O(log*n)_time_complexity_of_union%E2%80%93find
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#unionfind基础操作
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#unionfind-follow-up
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#topological-sort
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#建立graph--indegree
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#topological-sort---bfs
https://www.youtube.com/watch?v=_LuIvEi_kZk	https://www.youtube.com/watch?v=_LuIvEi_kZk
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#topological-sort---dfs
https://youtu.be/AfSk24UTFS8?t=42m	https://youtu.be/AfSk24UTFS8?t=42m
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#two-pointers
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#binary-search
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#template
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#中二思想
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#sort
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#常用
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#merge-sort
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#heap-sort
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#quick-sort
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#quick-select
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#bucket-sort
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#comparator-for-arrays-collections
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#dp
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#判断
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#四个步骤
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#确定状态
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#转移方程
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#初始条件边界情况
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#计算顺序
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#technique
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#基本原理
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#分类
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#网格坐标-coordinate
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#特殊
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#序列-sequence
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#特点-1
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#性质
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#特点-2
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#关键点
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#序列加状态
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#划分partition
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#性质-1
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#经验
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#解决方法
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#博弈类-game-theory
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#背包类-backpack
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#多种问法
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#方法策略
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#放入的物品没有顺序
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#区间类interval-dp
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#特点-3
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#三把斧
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#难点
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#bitwise-operation-dp
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#优化
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#minimaxmaximin
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#optimization-problems
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#double-sequence
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#存状态
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#记忆化搜索-memoization-dp
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#什么时候用记忆化搜索
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#特点-4
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#缺点
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#时间空间复杂度的节省
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#search
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#breadth-first-search
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#depth-first-search
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#for-loop-dfs-vs-pickskip-dfs
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#void-dfs
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#object-dfs
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#regular-premitives
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#customized-object
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#tree-dfs
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#combinatorics
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#dfs-思想
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#dfs-注意
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#permutation
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#原理
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#backtracking-dfs-recursive
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#插入法-iterative
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#sweep-line
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#backtracking
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#greedy
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#when-to-use
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#examples
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#reservoir-sampling
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#geometry
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#approach
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#遇到array
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#遇到需要排序
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#divide-and-conquer
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#recursion
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#特征
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#other-minor-problem-sets
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#回文串-palindrome
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#windows-problem
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#collections-functions
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#methods
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#arraylist
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#cs-basics
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#bigo-specials
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#time-complexity-of-graphdfs-block
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#sum-prefixsum
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#math
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#math-functions
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#numbers
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#probability-theory
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#combinatorics-1
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#subset-timespace
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#brainteaser
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#operating-system
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#threads
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#two-approaches
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#bit-manipulation
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#memory
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#java-garbage-collections
https://www.dynatrace.com/resources/ebooks/javabook/how-garbage-collection-works/	https://www.dynatrace.com/resources/ebooks/javabook/how-garbage-collection-works/
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#heap-1
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#garbage-collection-roots
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#example-4
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#marking-and-sweeping-carbage
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#pain-point
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#np-complete-problems
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#wiki
https://en.wikipedia.org/wiki/NP-completeness	https://en.wikipedia.org/wiki/NP-completeness
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#knapsack
https://en.wikipedia.org/wiki/Knapsack_problem	https://en.wikipedia.org/wiki/Knapsack_problem
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#travelling-salesman
https://en.wikipedia.org/wiki/Travelling_salesman_problem	https://en.wikipedia.org/wiki/Travelling_salesman_problem
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#basics
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#edge-case
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#advanced
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#pre-computation
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#knowledge--experience
	https://github.com/linux2Java/LintCode/blob/master/KnowledgeHash.md#java-design-pattern
https://www.journaldev.com/1827/java-design-patterns-example-tutorial	https://www.journaldev.com/1827/java-design-patterns-example-tutorial
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