Xiaozheng_Algo
Introduction
Index
Introduction
Algorithm Problems
Graph
关于最短路径算法的一些想法
Floyd Algorithm
Dijkstra Algorithm (BFS-2)
Union Find (Disjoint Sets) Algorithm
Clone Graph
Friend Circles
Graph Valid Tree
Topological Sorting
Course Schedule
Course Schedule II
Sequence Reconstruction
Number of Islands
Number of Islands II (Hard Google)
Number of Distinct Islands (Medium Amazon)
Number of Distinct Islands II （Hard Amazon）
Zombie in Matrix
Knight Shortest Path
Build Post Office II
Connected Component in Undirected Graph
Word Ladder
Word Ladder II
Evaluate Division
The Maze
The Maze II
The Maze III
Remove Substrings
Is Graph Bipartite? (Medium)
Flood Fill (Easy Uber)
Alien Dictionary
Reconstruct Itinerary
All Paths From Source to Target
Regions Cut By Slashes
Unique Paths III
Critical Connections in a Network
Tree
Validate Binary Search Tree
Symmetric Tree
Two Sum IV - Input is a BST
Iteratively Traverse BSTs
Trim a Binary Search Tree
Convert Binary Tree to Linked Lists by Depth
Find Mode in Binary Search Tree
Binary Tree Paths
Subtree with Maximum Average
Flatten Binary Tree to Linked List
Lowest Common Ancestor of a Binary Search Tree
Lowest Common Ancestor II
Lowest Common Ancestor III
Path Sum III
Binary Tree Path Sum II
Path Sum IV
Binary Tree Maximum Path Sum
Binary Tree Path Sum III
Binary Tree Serialization
Verify Preorder Serialization of a Binary Tree
Unique Binary Search Trees
Unique Binary Search Trees II
Balanced Binary Tree
Binary Tree Longest Consecutive Sequence
Binary Tree Longest Consecutive Sequence II
Inorder Successor in Binary Search Tree
Equal Tree Partition
Construct Binary Tree from Preorder and Inorder Traversal
Convert Sorted List to Binary Search Tree
Binary Tree Vertical Order Traversal
Binary Tree Zigzag Level Order Traversal
Find Duplicate Subtrees
Count Complete Tree Nodes
Closest Binary Search Tree Value II
Delete Node in a BST
Count Univalue Subtrees
Recover Binary Search Tree
Populating Next Right Pointers in Each Node
Minimum Depth of Binary Tree
Invert Binary Tree (easy)
Tweaked Identical Binary Trees
Check If Binary Tree Is Completed
Convert BST to Greater Tree (Easy Amazon)
Subtree of Another Tree (Easy Facebook)
Second Minimum Node In a Binary Tree (Easy LinkedIn)
Longest Univalue Path (Easy Google)
Maximum Width of Binary Tree
Kth Smallest Element in a BST
Check Completeness of a Binary Tree
Flip Binary Tree To Match Preorder Traversal
Smallest String Starting From Leaf
Vertical Order Traversal of a Binary Tree
Distribute Coins in Binary Tree
Cousins in Binary Tree
Maximum Binary Tree II
LinkedList & Array
Sorting Algorithms
Maximum Size Subarray Sum Equals k
Intersection of Two Linked Lists
Maximum Distance in Arrays
Insert into a Cyclic Sorted List
Merge Two Sorted Lists
Subarray Sum
Subarray Sum Equals K
Subarray Sum Closest
Copy List with Random Pointer
Reverse Linked List
Reverse Linked List II
Partition List
Sort List
Swap Nodes in Pairs (reverse Linked List in Pairs)
Reverse Nodes in k-Group
Add Two Numbers II
Remove Duplicates from Sorted Array
Remove Duplicates from Sorted Array II
Remove Duplicates from Sorted List II
Palindrome Linked List
Increasing Triplet Subsequence
Shortest Unsorted Continuous Subarray
Maximum Average Subarray
Linked List Cycle II
Rotate Array
Circular Array Loop
Insertion Sort List
Shortest Word Distance
Shortest Word Distance II
Reorder List
Permutation in String
Queue Reconstruction by Height （Medium）
Intersection of Two Arrays (easy)
Valid Word Square (easy)
Product of Array Except Self (Medium)
ReOrder Array
95 Percentile
Roman to Integer
Remove Duplicates from Sorted List
Merge Sorted Array
Find All Numbers Disappeared in an Array (easy)
Heaters (Easy Google)
Relative Ranks (Easy Google)
Longest Harmonious Subsequence (Easy)
Non-decreasing Array (Easy Google)
Degree of an Array
1-bit and 2-bit Characters
Odd Even Linked List
K Empty Slots
Set Matrix Zeroes
Third Maximum Number
Fruit Into Baskets
Longest Substring with At Most K Distinct Characters
Longest Mountain in Array
Reverse Pairs
Split Linked List in Parts
Pancake Sorting
Largest Perimeter Triangle
Subarrays with K Different Integers
Subarray Sums Divisible by K
Binary Search
Sqrt(x)
Kth Smallest Element in a Sorted Matrix
Find Right Interval
Search a 2D Matrix II
Maximum Number in Mountain Sequence
Find Peak Element
Total Occurrence of Target
K Closest Numbers In Sorted Array
Smallest Rectangle Enclosing Black Pixels
Maximum Average Subarray
Maximum Average Subarray II
Wood Cut
Find the Duplicate Number
Search in Rotated Sorted Array
Median of two Sorted Arrays
K-diff Pairs in an Array (Easy Amazon)
Trie
Longest Word in Dictionary
Implement Trie
String Manipulation
String Notes
Regular Expressions
KMP Search Algorithm
Robin Karp Algorithm
Shortest Palindrome
Count and Say
Find All Anagrams in a String
Longest Common Prefix
Valid Palindrome
Find Duplicate File in System
Fraction Addition and Subtraction
Is Subsequence
Maximum Product of Word Lengths
Longest Repeating Character Replacement
License Key Formatting
Decode String
Palindromic Substrings
Palindrome Permutation
Remove Duplicate Letters （hard）
Reverse Words in a String
Add Binary
Isomorphic Strings
Word Pattern
Valid Word Abbreviation （easy）
Longest Substring Without Repeating Characters (Medium)
Longest Palindromic Substring (Medium)
Reverse String II (Easy Google)
Valid Palindrome II (Easy LinkedIn)
Count Binary Substrings (Easy)
Bold Words in String (Easy Google)
Similar RGB Color (Ease Google)
Subdomain Visit Count (Easy)
String to Integer (atoi)
Brace Expansion II
DataStructure Problems
Maximum Product of Three Numbers
Next Greater Element II
High Five
K Closest Points
Kth Largest Element II
Rehashing
Ugly Number II
Insert Delete GetRandom O(1)
Insert Delete GetRandom O(1) - Duplicates allowed （hard）
Min Stack
Implement Stack by Two Queues
LRU Cache
LFU Cache
Top k Largest Numbers II
Merge k Sorted Lists
Merge k Sorted Arrays
Top K Frequent Words
Heapify
Longest Consecutive Sequence
Expression Expand
Zigzag Iterator
Flatten Nested List Iterator
Exclusive Time of Functions
Task Scheduler
Contains Duplicate III
Design Hit Counter
Two Sum III - Data structure design
Find K Pairs with Smallest Sums
Find Median from Data Stream
Design Log Storage System
Implement Stack using Queues
Design Compressed String Iterator (Easy Google)
Sentence Similarity (Easy Google)
Sliding Window Maximum
Largest Rectangle in Histogram
Basic Calculator II
Basic Calculator III
Group Anagrams
Maximal Rectangle
Design Phone Directory
Shortest Distance to a Character
Longest Valid Parentheses
Top K Trade Value Stock
Exam Room
Odd Even Jump
Satisfiability of Equality Equations
Random
Linked List Random Node
Random Pick Index
Shuffle an Array
Random7 Using Random5
Random1000 Using Random5
DFS
DFS notes
Permutation & Combination & Subsets
Subsets
Beautiful Arrangement
Palindrome Partitioning
Combination Sum
Combination Sum II
Combination Sum III
Combination Sum IV
Permutations
Permutations II
Next Permutation
Generate Parentheses
Remove Invalid Parentheses
Word Break II
Array Nesting
Lexicographical Numbers
N-Queens
Nested List Weight Sum (easy)
Letter Combinations of a Phone Number (Medium)
Letter Case Permutation (Easy Facebook)
Next Closest Time
Partition Equal Subset Sum
Partition to K Equal Sum Subsets
Word Search
Numbers With Same Consecutive Differences
Two Pointers Problem
K-diff Pairs in an Array (Easy Amazon)
Two Sum - Unique pairs
3Sum
4Sum
4Sum II
Two Sum - Less than or equal to target
Sort Colors
Sort Colors II
Window Sum
Valid Triangle Number
Partition Array II
Max Consecutive Ones II
Reverse Vowels of a String （easy）
Trapping Rain Water
Interval Problems
Non-overlapping Intervals
Merge Intervals
Insert Interval
Minimum Number of Arrows to Burst Balloons
Meeting Rooms II
Summary Ranges
Missing Ranges
Rectangle Overlap
Rectangle Area
Car Pooling
Dynamic Programming
Unique Paths
Unique Paths II
Unique Binary Search Trees
House Robber
House Robber III
Maximum Subarray
Maximum Product Subarray
Counting Bits
Integer Break
Predict the Winner
Best Time to Buy and Sell Stock I
Best Time to Buy and Sell Stock with Cooldown
Best Time To Buy And Sell Stock II
Best Time to Buy and Sell Stock III
Best Time to Buy and Sell Stock IV
Delete Operation for Two Strings（LCS）
Longest Palindromic Subsequence
Guess Number Higher or Lower II
Flip Game II
Can I Win
Paint House
Paint House II
Longest Increasing Subsequence
Number of Longest Increasing Subsequence
Coin Change
Coin Change 2
Climbing Stairs
Min Cost Climbing Stairs
Jump Game
Jump Game II
Paint Fence
Edit Distance (hard)
Max Product Of Cutting Rope
Regular Expression Matching (Hard)
Maximal Square (Largest Square of 1's)
Longest Cross of 1's
Largest Sub-Matrix Sum
Max Sum of Rectangle No Larger Than K (Hard)
Word Break
Wildcard Matching
Coins in a Line
Coins in a Line II
Minimum Path Sum
120 Triangle
410 Split Array Largest Sum
Delete Columns to Make Sorted III
Minimum Cost For Tickets
Longest Turbulent Subarray
Knapsack Problem
Find the Shortest Superstring
Number of Squareful Arrays
Greedy Algorithms
Delete Columns to Make Sorted II
Find the Celebrity
Binary Tree Cameras
Minimum Number of K Consecutive Bit Flips
Bit Manipulation
Bit Manipulation Notes
Reverse Bits
Maximum XOR of Two Numbers in an Array
Single Number II
Single Number III
Total Hamming Distance
Reverse Integer
Convert a Number to Hexadecimal
Prime Number of Set Bits in Binary Representation
Sum of Two Integers
Binary Watch (easy)
Binary Number with Alternating Bits (Easy Yahoo)
Triples with Bitwise AND Equal To Zero
Computer Graphics
Minimum Area Rectangle
Minimum Area Rectangle II
Generate Random Point in a Circle
Grid Illumination
Math Problems
Nth digit
Count Primes
Divide Two Integers
2 Keys Keyboard
Gray Code
Excel Sheet Column Title
Majority Element II
Factorial Trailing Zeroes
Power of Four
Pow(x, n)
Happy Number
Largest Palindrome Product
Sum of Square Numbers (Easy LinkedIn)
Sparse Matrix Multiplication
Equal Rational Numbers
Broken Calculator
Least Operators to Express Number
Brainteaser
Bulb Switcher
Elimination Game
Other Problems
Drop Eggs
Diagonal Traverse
Reconstruct Original Digits from English
Spiral Matrix II
Strobogrammatic Number （I, II, III）
Number of Boomerangs
Rotated Digits (Easy Google)
Magic Squares In Grid (Easy Google)
Rotate Image
Prison Cells After N Days
Operating System
Introduction
Life and Death of Processes
Signals and handlers
Shell and Glue
Pointers and Types
Process Lifecycle
Threads
Multithreaded Programming
Locks and the Bounded Buffer
Atomicity and semaphores
Dead Lock
Memory Management
Virtual Memory
Memory Addressing
How Lock Wait Awake Works
C++ Notes
Cpp Note1: 右值引用于移动语意
Cpp Note2: 运算符重载，容器使用，Function Object，virtual method
Cpp Note3: 函数指针，函数对象，Lambda
Cpp Note4: 细节
Cpp Note5: 多线程
Cpp Note6: Val Categories, 函数参数与返回值, Copy Elision
Cpp Note7: auto
Cpp Note8: iterrators
System Design
Basic Idea
Design Pattern
Design Pattern
Design Principles
Iterator Pattern
Adapter Pattern
Template Method Pattern
Factory Method Pattern
Singleton Pattern
Prototype Pattern
Builder Pattern
Abstract Factory Pattern
Bridge Pattern
Strategy Pattern
Composite Pattern
Decorator Pattern
Visitor Pattern
Chain of Responsibility
Facade Pattern
Java Multithreading
Java Multithreading
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Permutation & Combination & Subsets
Permutation & Combination & Subsets
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