• 2025.03.04 Service-Oriented Architecture, SOAP and REST
• 2025.03.02 <Coursera> Reinforcement Learning 1
• 2025.03.01 <Coursera> Reinforcement Learning 0
• 2025.02.23 Deploy Github Pages in Year 2025
• 2024.12.08 Node.js - how to use pnpm globally
• 2024.12.05 Python environment management
• 2024.12.03 Docker compose tutorial
• 2024.12.01 Blocking/non-blocking in Python with async/await
• 2024.11.30 One-line launch anything from Mac OS
• 2024.09.25 System Design 2024 - Amazon
• 2024.09.25 System Design 2024 - Bidding Platform
• 2024.08.20 Explain LLM in Simple Terms
• 2024.08.09 System Design 2024 - Robinhood
• 2024.07.29 System Design 2024 - Twitter
• 2024.07.29 System Design 2024 - TicketMaster
• 2024.07.29 System Design 2024 - Youtube
• 2024.07.28 TODO
• 2024.07.16 2285. Maximum Total Importance of Roads
• 2024.07.16 2341. Maximum Number of Pairs in Array
• 2024.07.16 445. Add Two Numbers II
• 2024.07.16 380. Insert Delete GetRandom O(1)
• 2024.07.16 Setup Zookeeper + Kafka in VMware
• 2024.07.16 1094. Car Pooling
• 2023.01.16 Maven tutorial
• 2022.12.02 Hackerrank - DigitalWallet
• 2022.12.01 RuntimeException and checked Exception
• 2022.12.01 347. Top K Frequent Elements
• 2022.11.20 543. Diameter of Binary Tree
• 2022.11.20 206. Reverse Linked List
• 2022.11.20 1628. Design an Expression Tree With Evaluate Function
• 2022.11.20 Java一些基础语法：Comparator, MapEntry, Iterator
• 2022.11.20 1152. Analyze User Website Visit Pattern
• 2022.11.18 277. Find the Celebrity
• 2022.11.18 285. Inorder Successor in BST
• 2022.11.18 472. Concatenated Words
• 2022.11.18 364. Nested List Weight Sum II
• 2022.11.18 339. Nested List Weight Sum
• 2022.11.18 1429. First Unique Number
• 2022.11.18 1428. Leftmost Column with at Least a One
• 2022.11.18 510. Inorder Successor in BST II
• 2022.11.17 System design cheat sheet
• 2022.11.17 Google questions
• 2022.11.15 System design questions
• 2022.11.15 Java Design Pattern
• 2022.11.15 207. Course Schedule
• 2022.11.15 394. Decode String
• 2022.11.15 695. Max Area of Island
• 2022.11.15 987. Vertical Order Traversal of a Binary Tree
• 2022.11.15 653. Two Sum IV - Input is a BST
• 2022.11.15 1046. Last Stone Weight
• 2022.11.14 1160. Find Words That Can Be Formed by Characters
• 2022.11.14 803. Bricks Falling When Hit
• 2022.11.14 2402. Meeting Rooms III
• 2022.11.14 683. K Empty Slots
• 2022.11.12 359. Logger Rate Limiter
• 2022.11.12 681. Next Closest Time
• 2022.11.12 545. Boundary of Binary Tree
• 2022.11.11 430. Flatten a Multilevel Doubly Linked List
• 2022.11.10 1854. Maximum Population Year
• 2022.11.09 2104. Sum of Subarray Ranges
• 2022.11.09 719. Find K-th Smallest Pair Distance
• 2022.11.09 948. Bag of Tokens
• 2022.11.09 739. Daily Temperatures
• 2022.11.09 773. Sliding Puzzle
• 2022.11.09 662. Maximum Width of Binary Tree
• 2022.11.09 240. Search a 2D Matrix II
• 2022.11.09 241. Different Ways to Add Parentheses
• 2022.11.09 158. Read N Characters Given read4 II - Call Multiple Times
• 2022.11.08 2259. Remove Digit From Number to Maximize Result
• 2022.11.08 1567. Maximum Length of Subarray With Positive Product
• 2022.11.08 2221. Find Triangular Sum of an Array
• 2022.11.08 2006. Count Number of Pairs With Absolute Difference K
• 2022.11.08 1710. Maximum Units on a Truck
• 2022.11.08 1153. String Transforms Into Another String
• 2022.11.08 1405. Longest Happy String
• 2022.11.08 163. Missing Ranges
• 2022.11.08 1652. Defuse the Bomb
• 2022.11.08 238. Product of Array Except Self
• 2022.11.08 253. Meeting Rooms II
• 2022.11.08 261. Graph Valid Tree
• 2022.11.08 276. Paint Fence
• 2022.11.08 269. Alien Dictionary
• 2022.11.08 311. Sparse Matrix Multiplication
• 2022.11.08 340. Longest Substring with At Most K Distinct Characters
• 2022.11.08 346. Moving Average from Data Stream
• 2022.11.08 366. Find Leaves of Binary Tree
• 2022.11.08 418. Sentence Screen Fitting
• 2022.11.08 523. Continuous Subarray Sum
• 2022.11.08 642. Design Search Autocomplete System
• 2022.11.08 1662. Check If Two String Arrays are Equivalent
• 2022.11.08 244. Shortest Word Distance II
• 2022.11.08 1123. Lowest Common Ancestor of Deepest Leaves
• 2022.11.08 1143. Longest Common Subsequence
• 2022.11.08 1249. Minimum Remove to Make Valid Parentheses
• 2022.11.08 1254. Number of Closed Islands
• 2022.11.08 1302. Deepest Leaves Sum
• 2022.11.08 1326. Minimum Number of Taps to Open to Water a Garden
• 2022.11.08 1352. Product of the Last K Numbers
• 2022.11.08 1423. Maximum Points You Can Obtain from Cards
• 2022.11.08 1654. Minimum Jumps to Reach Home
• 2022.11.08 17.12. BiNode LCCI
• 2022.11.08 1712. Ways to Split Array Into Three Subarrays
• 2022.11.08 1769. Minimum Number of Operations to Move All Balls to Each Box
• 2022.11.08 1864. Minimum Number of Swaps to Make the Binary String Alternating
• 2022.11.08 202. Happy Number
• 2022.11.08 2096. Step-By-Step Directions From a Binary Tree Node to Another
• 2022.11.08 210. Course Schedule II
• 2022.11.08 222. Count Complete Tree Nodes
• 2022.11.08 2290. Minimum Obstacle Removal to Reach Corner
• 2022.11.08 234. Palindrome Linked List
• 2022.11.08 236. Lowest Common Ancestor of a Binary Tree
• 2022.11.08 295. Find Median from Data Stream
• 2022.11.08 331. Verify Preorder Serialization of a Binary Tree
• 2022.11.08 417. Pacific Atlantic Water Flow
• 2022.11.08 440. K-th Smallest in Lexicographical Order
• 2022.11.08 463. Island Perimeter
• 2022.11.08 547. Number of Provinces
• 2022.11.08 622. Design Circular Queue
• 2022.11.08 655. Print Binary Tree
• 2022.11.08 710. Random Pick with Blacklist
• 2022.11.08 875. Koko Eating Bananas
• 2022.11.08 981. Time Based Key-Value Store
• 2022.11.08 993. Cousins in Binary Tree
• 2022.11.04 727. Minimum Window Subsequence
• 2022.11.04 1740. Find Distance in a Binary Tree
• 2022.11.04 250. Count Univalue Subtrees
• 2022.11.02 937. Reorder Data in Log Files
• 2022.11.02 994. Rotting Oranges
• 2022.11.01 224. Basic Calculator
• 2022.11.01 MyBatis and SSM (Spring/SpringMVC/MyBatis)
• 2022.10.31 Redis (NoSQL) Cache
• 2022.10.31 SpringMVC learning notes
• 2022.10.30 1366. Rank Teams by Votes
• 2022.10.30 MySql (3) - Sharding
• 2022.10.30 MySql (2) - Master/slave
• 2022.10.30 MySql (4) - Performance Optimization
• 2022.10.30 MySql (1) - Indexing, Locking and Transaction
• 2022.10.30 Java Spring framework
• 2022.10.29 并查集 (261. Graph Valid Tree)
• 2022.10.29 221. Maximal Square
• 2022.10.29 239. Sliding Window Maximum
• 2022.10.29 264. Ugly Number II
• 2022.10.29 299. Bulls and Cows
• 2022.10.29 396. Rotate Function
• 2022.10.29 426. Convert Binary Search Tree to Sorted Doubly Linked List
• 2022.10.29 652. Find Duplicate Subtrees
• 2022.10.29 692. Top K Frequent Words
• 2022.10.29 696. Count Binary Substrings
• 2022.10.29 769. Max Chunks To Make Sorted
• 2022.10.29 797. All Paths From Source to Target
• 2022.10.29 785. Is Graph Bipartite?
• 2022.10.29 983. Minimum Cost For Tickets
• 2017.05.22 [Question] Trie Wildcard String Matching
• 2017.05.13 [Question] Dutch national flag problem
• 2016.08.01 [Design] How to Design Logging
• 2016.07.31 [Design] MVC, MVP and MVVM
• 2016.07.11 [Design] Design Twitter
• 2016.06.11 [Octopress] Add Aside Content to Octopress
• 2016.05.08 [Design] User Registry Table Design
• 2015.11.22 [Design] Designing a simple web crawler
• 2015.11.21 [Design] How to generate Maze
• 2015.11.21 [Question] Swizzle Sort
• 2015.11.18 [Design] Strategy design pattern
• 2015.11.15 [Question] Partition Problem (divide array into halves)
• 2015.11.04 [LeetCode 188] Best Time to Buy and Sell Stock IV
• 2015.10.28 [Java OOP] Java ArrayList implementation
• 2015.10.23 [Java OOP] Template method pattern (abstract class)
• 2015.10.23 [Java OOP] What is Java Exception
• 2015.10.23 [Java OOP] Static class and Inner class
• 2015.10.23 [Java OOP] Java Vector and ArrayList
• 2015.10.22 [Java OOP] Why avoid using Protected?
• 2015.10.22 [Fundamental] What is a Literal?
• 2015.10.22 [Fundamental] Reflexive, Symmetric and Transitive Rules
• 2015.10.22 [Fundamental] Polynomial, quadratic, cubic and exponential
• 2015.10.14 [Fundamental] UML Class Diagrams
• 2015.10.13 [LintCode] Segment Tree Build II
• 2015.10.13 [LintCode] Segment Tree Build
• 2015.10.13 [LintCode] Segment Tree Modify
• 2015.10.13 [LintCode] Segment Tree Query II
• 2015.10.13 [LintCode] Segment Tree Query
• 2015.10.08 [Fundamental] Segment Tree
• 2015.10.07 [Question] Find Cloest Leaf in Binary Tree
• 2015.10.07 [Amazon] All Strings by Placing Spaces
• 2015.10.07 [Question] Largest Sub-square with Edges filled
• 2015.10.04 [Fundamental] The 7 Bridges Problem
• 2015.10.02 [Google] Shortest Manhattan Distance
• 2015.09.02 [Design] Facebook Photo Storage
• 2015.08.30 [NineChap System Design] Class 4.1: Crawler
• 2015.08.30 [NineChap System Design] Class 4.2: Search Engine
• 2015.08.30 [Design] How Google search works
• 2015.08.28 [NineChap System Design] Class 3.1: Web Service
• 2015.08.28 [NineChap System Design] Class 3.2: Web Service
• 2015.08.26 [NineChap System Design] Class 2.1: Database
• 2015.08.26 [NineChap System Design] Class 2.2: Database
• 2015.08.24 [Java OOP] Three Properties of Class/Object
• 2015.08.23 [NineChap System Design] Class 1.1: Overview
• 2015.08.23 [NineChap System Design] Class 1.2: An Example
• 2015.08.23 [NineChap System Design] Class 1.3: Improvement
• 2015.07.23 [Design] How is Pipe implemented in Unix/Linux
• 2015.06.09 [Design] Cryptographic standard, AES and RSA
• 2015.06.08 [Design] Linux and TCP ports
• 2015.05.24 [Java OOP] Overload, Override, Compile, Runtime (Static/Dynamic Polymph)
• 2015.05.21 [Palantir] Sort Letters Given Lexicographic Order
• 2015.05.10 [LeetCode 199] Binary Tree Right Side View
• 2015.05.10 [LeetCode 201] Bitwise AND of Numbers Range
• 2015.05.10 [LeetCode 198] House Robber
• 2015.05.10 [LeetCode 191] Number of 1 Bits
• 2015.05.10 [LeetCode 200] Number of Islands
• 2015.05.10 [LeetCode 190] Reverse Bits
• 2015.05.10 [LeetCode 189] Rotate Array
• 2015.05.01 [LeetCode 187] Repeated DNA Sequences
• 2015.04.15 [LeetCode 173] Binary Search Tree Iterator
• 2015.04.15 [LeetCode 174] Dungeon Game
• 2015.04.15 [LeetCode 179] Largest Number
• 2015.04.14 [LeetCode 168] Excel Sheet Column Title
• 2015.04.14 [LeetCode 169] Majority Element
• 2015.04.14 [Question] 编程之美 NIM 一排石头的游戏
• 2015.04.14 [UVa] Wooden Sticks
• 2015.04.13 [LeetCode 171] Excel Sheet Column Number
• 2015.04.13 [LeetCode 164] Maximum Gap
• 2015.04.13 [LeetCode 172] Factorial Trailing Zeroes
• 2015.04.12 [LeetCode 162] Find Peak Element
• 2015.04.12 [Palantir] Find Duplicate within K Distance
• 2015.04.12 [LeetCode 165] Compare Version Numbers
• 2015.04.12 [Palantir] MultiMap in Java without using Collections
• 2015.04.11 [LeetCode 166] Fraction to Recurring Decimal
• 2015.04.08 [LeetCode 160] Intersection of Two Linked Lists
• 2015.04.07 [LeetCode 154] Find Minimum in Rotated Sorted Array II
• 2015.04.07 [LeetCode 153] Find Minimum in Rotated Sorted Array
• 2015.04.07 [Octopress] Add Google AdSense to Octopress
• 2015.04.07 [LeetCode 155] Min Stack
• 2015.04.07 [LeetCode 152] Maximum Product Subarray
• 2015.02.15 [Design] HBase and HDFS
• 2015.02.14 [Design] Speed Up Webpage for Slow Connection (1)
• 2015.02.14 [Design] Speed Up Webpage for Slow Connection (4)
• 2015.02.14 [Design] Speed Up Webpage for Slow Connection (3)
• 2015.02.14 [Design] Speed Up Webpage for Slow Connection (2)
• 2015.02.13 [LinkedIn] Sum of integer weighted by depth
• 2015.02.13 [LinkedIn] Unique combination of factors (因式分解)
• 2015.02.13 [Google] Minimum adjustments
• 2015.02.13 [LinkedIn] Sort part to make entire array sorted
• 2015.02.12 [LinkedIn] Executive's Schedule
• 2015.02.11 [Design] Application Server vs. Web Server
• 2015.02.11 [LinkedIn] Isomorphic Strings
• 2015.02.10 [Design] Design Cache System (`)
• 2015.02.09 [Java OOP] Can abstract class have 0 abstract method?
• 2015.02.09 [Java OOP] Can abstract class have constructor
• 2015.02.09 [Question] Count multiples of array
• 2015.02.09 [Google] Array Signature
• 2015.02.09 [Google] Heap and BST conversion
• 2015.02.09 [Design] Intro to Google Spanner
• 2015.02.09 [Google] Number of slices
• 2015.02.08 [Design] Big Data - Find Common Elements in 2 Lists
• 2015.02.08 [Google] BST find ceiling
• 2015.02.08 [Design] Difference: Internet and the Web
• 2015.02.08 [Design] Find similar library books
• 2015.02.08 [Facebook] Generate number with Given probability
• 2015.02.08 [Google] Transform a unbalanced tree into balanced tree
• 2015.02.08 [Google] Transform a unbalanced tree into balanced tree
• 2015.02.07 [Question] Check string with no common letters (Bitmask)
• 2015.02.07 [Google] Continental divider
• 2015.02.07 [Google] Max prodcut of strings that have no common char
• 2015.02.07 [Google] First Unique URL
• 2015.02.07 [Design] Multithreading Async Increment Problem
• 2015.02.07 [Question] Reservoir sampling
• 2015.02.05 [Google] Implement a Blocking Queue
• 2015.02.05 [Google] Multi-server Messaging System
• 2015.02.05 [Java OOP] PubSub (Publish–subscribe) pattern
• 2015.02.05 [Google] Set Cover Problem
• 2015.02.05 [Design] Winning Games Rank (pagerank)
• 2015.02.04 [Google] Data Structure of Insert, Remove, GetRandom
• 2015.02.04 [Google] Collatz Conjecture (Oneness property)
• 2015.02.04 [Amazon] Grep command interview question
• 2015.02.04 [Google] Number of subtrees with even nodes
• 2015.02.04 [Google] Snakes and ladders
• 2015.02.03 [Design] Monitor Rps for Past sec/min/hr
• 2015.02.01 [Greedy] Activity Selection Problem
• 2015.02.01 [Greedy] Each Employee 2 events
• 2015.02.01 [Design] Limit the Request per Second
• 2015.02.01 [Question] Stock Span Problem (couting BST)
• 2015.01.30 [Question] 2D Bin Packing
• 2015.01.29 [Question] Packing Rectangles
• 2015.01.29 [Apple] Calculate Area
• 2015.01.29 [Question] Product Array Puzzle
• 2015.01.28 [Fundamental] Implement Trie and Suffix Tree
• 2015.01.28 [Question] Two Dimensional Knapsack Problem
• 2015.01.27 [Google] Generate Request ID
• 2015.01.27 [Fundamental] Prefix Tree
• 2015.01.27 [Fundamental] Pattern Searching Algorithms
• 2015.01.27 [Fundamental] Suffix Array
• 2015.01.27 [Fundamental] Suffix Tree
• 2015.01.26 [Question] Push and Pop Sequences of Stacks
• 2015.01.26 [Google] Make a Java method thread-safe
• 2015.01.24 [Design] Design Google Suggest (autocomplete)
• 2015.01.24 [Design] Distributed Caching - memcached
• 2015.01.20 [Palantir] Largest basin size in matrix
• 2015.01.20 [Design] Difference between HTTP and HTTPS
• 2015.01.20 [Java OOP] Interface and Abstract classes
• 2015.01.20 [Java OOP] Java Vector and ArrayList
• 2015.01.20 [Google] Top n values from Sum of 2 arrays
• 2015.01.19 [Question] Check if two line segments intersect
• 2015.01.19 [Question] Check if given point inside polygon
• 2015.01.19 [Design] Difference between HTTP protocol and TCP protocol
• 2015.01.18 [Google] Lexicographic order (letter replacement) of dictionary
• 2015.01.18 [Question] Maximum square sub-matrix with all 1s
• 2015.01.18 [Amazon] Lexicographic rank of a string
• 2015.01.17 [Amazon] Find nodes of distance k from Binary Tree
• 2015.01.12 [Java OOP] Java BlockingQueue (1)
• 2015.01.12 [Java OOP] BlockingQueue and Thread Pool
• 2015.01.12 [Java OOP] Java BlockingQueue (2)
• 2015.01.11 [Google] Diameter of a Binary Tree
• 2015.01.11 [LinkedIn] Find all repeating substring with given length
• 2015.01.11 [Google] Check if repeating subsequence exists
• 2015.01.11 [Google] Crazy Distance Between Strings
• 2015.01.11 [Amazon] Longest Repeating Substring
• 2015.01.11 [Question] Number of occurence of given sub-sequence
• 2015.01.11 [Question] Number of distinct sub-sequence
• 2015.01.11 [Question] All distinct subsequences with given length
• 2015.01.10 [Google] Form a Queue Given Heights
• 2015.01.10 [Google] Maximum Count Array in a Queue
• 2015.01.10 [Amazon] Mininum Range that includes at least One
• 2015.01.10 [Google] Reverse a Stack without DS
• 2015.01.09 [Design] Real Time Top k
• 2015.01.09 [Question] Most Frequent Word from a book
• 2015.01.09 [Design] Terminology: n-gram
• 2015.01.09 [Amazon] Match triplet with reverse order
• 2015.01.09 [Design] Big Data - Top k Frequency (hands-on)
• 2015.01.08 [Google] Number of distinct substrings
• 2015.01.08 [Google] Check all numbers given the decimal scale
• 2015.01.07 [Design] P2P Technology
• 2015.01.07 [Question] Longest Common Substring
• 2015.01.07 [Facebook] Scheduling Jobs with Max Cost
• 2015.01.06 [Facebook] Write a Json prettifier
• 2015.01.06 [Design] Big Data Storage
• 2015.01.06 [Design] Cloud, Grid and Cluster
• 2015.01.06 [Design] Distributed hash table
• 2015.01.02 [Question] Frog Crossing (dynamic programming)
• 2014.12.27 [Design] Database Indexing
• 2014.12.23 [Ruby] Endless error with gem dependencies
• 2014.12.23 [Java OOP] Java Runtime Exception
• 2014.12.22 [Java OOP] Discussion of Polymorphism
• 2014.12.22 [Facebook] Maximum sum such that no two elements are adjacent
• 2014.12.22 [Ruby] RubyGems, gem, Gemfile and Bundler
• 2014.12.22 [Java OOP] Interface extend another Interface
• 2014.12.22 [Question] Split an integer or coin
• 2014.12.22 [Java OOP] Common Root of Java Classes
• 2014.12.22 [Java OOP] Override/overload Java main method
• 2014.12.18 [Facebook] Binary Search Tree 3Sum
• 2014.12.17 [Facebook] Print a Binary Tree in Vertical Order
• 2014.12.17 [Question] Equilibrium Points in 2D Array
• 2014.12.08 [Epic] Patient Disease Data Structure
• 2014.12.02 [Question] Axis Aligned Rectangles
• 2014.11.30 [Question] Multiples of 3 and 5
• 2014.11.04 [Google] Code a HashMap
• 2014.11.01 [Question] Find row with most 1s
• 2014.10.08 [Question] Interleave Positive and Negative Numbers
• 2014.10.02 [CC150v5] 18.7 Longest Word Made From Other Words
• 2014.10.01 [CC150v5] 17.14 Optimal Way to Unconcatenate Doc
• 2014.09.30 [CC150v5] 17.13 Convert BST to DLL
• 2014.09.28 [CC150v5] 11.8 Get Rank in Stream of Integers
• 2014.09.27 [CC150v5] 17.6 Order an Array by Sorting Middle
• 2014.09.26 [CC150v5] 14.6 Implement CircularArray in Java
• 2014.09.24 [CC150v5] 11.4 Sort 20GB File
• 2014.09.24 [CC150v5] 12.0 Example - Troubleshoot Google Chrome
• 2014.09.17 [CC150v5] 9.3 Find Magic Index
• 2014.09.17 [CC150v5] 9.7 Paint Fill in Map
• 2014.09.17 [CC150v5] 9.11 Parenthesize the Expression
• 2014.09.17 [CC150v5] 9.10 Stack up the Boxes
• 2014.09.16 [CC150v5] 5.1 Binary Merge 2 Numbers
• 2014.09.16 [Brain teaser] 6.1 Bottles of Pills
• 2014.09.16 [CC150v5] 5.5 Calculate Bits Conversion Required
• 2014.09.16 [Google] Guess Password
• 2014.09.16 [CC150v5] 5.6 Swap Odd and Even Bits
• 2014.09.15 [CC150v5] 3.0 Example - Implement Stack
• 2014.09.15 [CC150v5] 2.7 Linked List Palindrome
• 2014.09.15 [CC150v5] 3.2 Stack Min Value
• 2014.09.15 [CC150v5] 3.7 Stack of Animals
• 2014.09.14 [CC150v5] 2.2 Kth last element (recursive)
• 2014.09.12 [Design] DNS Communication Protocol
• 2014.09.11 [Google] Length of Longest Arithmetic Progression (LLAP)
• 2014.09.11 [Google] Arithmetic Progression Triplet
• 2014.09.11 [Question] Celebrity Problem
• 2014.09.11 [Google] Barrier, Goods Van and Distance
• 2014.09.10 [CC150v4] 20.4 Count 2s in Digits
• 2014.09.10 [CC150v4] 20.11 Find Subsquare with Black Border
• 2014.09.10 [CC150v4] 20.8 Full Text Search (suffix tree)
• 2014.09.10 [CC150v4] 20.12 Sub-matrix with Largest Sum
• 2014.09.10 [CC150v4] 20.3 Generate M int from Array of Size N
• 2014.09.10 [CC150v4] 20.6 Top Million from Billion
• 2014.09.09 [Google] Winner of tic-tac-toe
• 2014.09.09 [CC150v4] 19.4 Get Max Number without Comparator
• 2014.09.09 [CC150v4] 19.6 Convert Integer to English
• 2014.09.08 [CC150v4] 10.4 Implement Mathematical Operators
• 2014.09.08 [CC150v4] 14.2 Java Finally Statement
• 2014.09.08 [CC150v4] 14.3 Java Final, Finally and Finalize
• 2014.09.08 [CC150v4] 10.6 Find Collinear in 2D Plane
• 2014.09.08 [CC150v4] 14.6 Java HashMap Counter
• 2014.09.08 [CC150v4] 14.1 Java Private Constructor
• 2014.09.08 [CC150v4] 14.5 Java Reflection
• 2014.09.08 [CC150v4] 11.2 Random error debugging 2
• 2014.09.08 [CC150v4] 15.1 SQL count and group by statement
• 2014.09.08 [CC150v4] 15.2 SQL Types of Join
• 2014.09.08 [CC150v4] 11.4 Test Webpage without Tools
• 2014.09.07 [CC150v4] 5.2 Convert Integer to Binary Form
• 2014.09.07 [Brain teaser] 6.2 Cover the Chess Board
• 2014.09.07 [CC150v4] 5.7 Find Missing Number
• 2014.09.07 [CC150v4] 8.4 Generate Permutation Recursively
• 2014.09.07 [CC150v4] 9.5 Search Array Containing Empty String
• 2014.09.07 [CC150v4] 9.0 Example - Sort Persons
• 2014.09.06 [Google] Form a Palindrome with Insertion
• 2014.09.06 [CC150v4] 4.7 Check Subtree
• 2014.09.06 [CC150v4] 4.5 Find Next Node in BST
• 2014.09.06 [CC150v4] 4.8 Print Path Sum to Value
• 2014.09.06 [CC150v4] 3.4 Towers of Hanoi
• 2014.09.06 [CC150v4] 3.6 Sort Stack
• 2014.09.04 [Google] Find Second Shortest Path
• 2014.09.04 [Google] Unsolved Mystery of UTF8 Encoding
• 2014.09.03 [Design] Leader Election
• 2014.09.03 [Google] String Replacement Question
• 2014.09.03 [Google] Weird Sort Array
• 2014.09.02 [Google] Find Anagrams in Dictionary
• 2014.09.02 [Java OOP] Observer pattern
• 2014.09.02 [Google] Array Distance A(i)+A(j)+(j-i)
• 2014.09.01 [Google] Crosswod Solver
• 2014.09.01 [Facebook] Hamming Distance of Array
• 2014.09.01 [Design] Multithreading - Deadlock Prevention
• 2014.08.30 [Fundamental] A-Star Search
• 2014.08.30 [Design] Cryptographic Hash, MD5 and Digital signature
• 2014.08.30 [Fundamental] Travelling salesman problem
• 2014.08.30 [Fundamental] Min-Max Algorithm (minmax)
• 2014.08.29 [Google] Boggle Solver (search words from matrix)
• 2014.08.28 [Design] HTTP cookie
• 2014.08.28 [Google] Google Pre-interview Coaching
• 2014.08.28 [CC150v4] 10.7 Ugly Numbers (Hamming numbers)
• 2014.08.27 [Twitter] Count Visible Nodes in Binary Tree
• 2014.08.27 [Question] Duplicate Rows in Matrix
• 2014.08.27 [Twitter] Largest Cycle in Permutation
• 2014.08.27 [Google] Google API read4096 (read4K)
• 2014.08.26 [Design] OOD Design of Elevator
• 2014.08.26 [Testing] Test hashCode() function
• 2014.08.26 [Design] Virtual Memory, Page Fault and Thrashing
• 2014.08.25 [CC150v5] 8.9 Design a in-memory File System
• 2014.08.25 [CC150v5] 8.10 Implement a Hashmap
• 2014.08.25 [CC150v5] 8.4 Design a Parking Lot
• 2014.08.24 [CC150v5] 8.7 Design Online Chat Server (1)
• 2014.08.24 [CC150v5] 8.7 Design Online Chat Server (2)
• 2014.08.24 [CC150v5] 8.8 Design Othello Game
• 2014.08.23 [Design] Merits of BST over HashTables
• 2014.08.23 [Design] Shared Hosting vs. VPS Hosting
• 2014.08.23 [Design] Stack and Heap
• 2014.08.22 [CC150v5] 8.1 Design a Generic Deck of Cards
• 2014.08.20 [Question] Square Count of Matchstick Graph
• 2014.08.20 [Question] Count Set Bit in Binary Number
• 2014.08.20 [Question] Ways of Dice Throw
• 2014.08.20 [Java OOP] Singleton, 3 implementations
• 2014.08.19 [Java OOP] Factory Pattern
• 2014.08.19 [Question] Count Level in Perfect Binary Tree
• 2014.08.19 [Java OOP] Singleton Pattern Introduction
• 2014.08.17 [Twitter] Arithmetic Expression Evaluation
• 2014.08.17 [ItInt5] Number of Valid Trees Given Preorder and Postorder
• 2014.08.17 [ItInt5] Numbers Concatenation Max (Largest Number)
• 2014.08.16 [ItInt5] Excel Decimal Conversion
• 2014.08.16 [Google] Orthogonal Traverse the Map (`)
• 2014.08.15 [Google] Alphabet Table (`)
• 2014.08.15 [Question] Greatest Common Divisor
• 2014.08.15 [ItInt5] 跳马问题加强版
• 2014.08.15 [Google] Product All 1s
• 2014.08.15 [Facebook] Task Scheduling Question
• 2014.08.14 [Facebook] Query Search (HashMap, suffix array)
• 2014.08.12 [Design] From Client/Server to Multi-Tier
• 2014.08.12 [CC150v4] 9.7 Circus Tower Routine
• 2014.08.11 [Design] TCP 3-Way Handshake
• 2014.08.11 [ItInt5] Maximum circular subarray sum
• 2014.08.11 [Google] Count Complete Binary Tree
• 2014.08.10 [Design] Big Data - Remove Duplicate Numbers
• 2014.08.10 [Design] Big Data - Top k Frequency (case analysis)
• 2014.08.10 [Design] Big Data - Find Median Numbers
• 2014.08.10 [Design] Big Data - Find Existence of a Number
• 2014.08.10 [Design] Big Data - Fuzzy Search url (Bloom Filter)
• 2014.08.09 [Design] Functional programming
• 2014.08.09 [Design] Median of array in Distributed Computers
• 2014.08.09 [Design] Process VS. Thread
• 2014.08.09 [Testing] Test Command Line Copy
• 2014.08.08 [Question] Add Integers without +/++
• 2014.08.08 [Design] Composition Over Inheritance
• 2014.08.08 [Question] Decimal to Hexadecimal
• 2014.08.08 [Question] Max Sum Of Non-Consecutive Elements
• 2014.08.08 [Design] Producer Consumer Problem
• 2014.08.08 [Java OOP] Thread pool pattern
• 2014.08.07 [Google] Million Phone Numbers
• 2014.08.07 [Design] Distributed Network Bottleneck
• 2014.08.07 [CC150v4] 9.4 Sort Large Files
• 2014.08.07 [Testing] Random error debugging 1
• 2014.08.06 [Google] Connect Graph Nodes and Avoid Intersect
• 2014.08.06 [Design] HTTP Headers
• 2014.08.06 [Design] Networks and TCP/IP
• 2014.08.06 [Google] Postorder successor in Binary Tree
• 2014.08.05 [Design] MapReduce Common Friends Example
• 2014.08.05 [Design] Amazon Web Services
• 2014.08.05 [Design] MapReduce Intro
• 2014.08.05 [Google] Replace Question Mark With Number
• 2014.08.05 [Java OOP] Upcasting, Downcasting and Object Slicing
• 2014.08.05 [Google] Write a Random Number Generator
• 2014.08.05 [Question] Print Numbers containing 5
• 2014.08.04 [Google] Find Occurance Greater Than Index
• 2014.08.04 [Design] Hadoop cluster
• 2014.08.04 [Design] Model–view–controller (MVC)
• 2014.08.04 [Google] Traveller Path Problem
• 2014.08.04 [Design] Overview of Big Data Technology
• 2014.08.04 [Google] Find Nearest Point in a 2D Space
• 2014.08.03 [Google] Design Solar System (`)
• 2014.08.03 [CC150v4] 17.1 Type a URL in Browser and Hit Enter
• 2014.08.03 [Google] Three Keys Data Structure
• 2014.08.03 [Design] Multilayered architecture
• 2014.08.02 [Google] Special increasing adjacent sequence
• 2014.08.02 [Google] Print string comparison order
• 2014.08.01 [Question] Arranging Sequence
• 2014.08.01 [Question] Overriding private method
• 2014.08.01 [Question] Max Sum In A 2D Array (sub-matrix)
• 2014.08.01 [Question] Shuffle An Array (Fisher–Yates)
• 2014.07.31 [Question] Inorder Successor in Binary Search Tree
• 2014.07.31 [Question] Run-Length Encoding
• 2014.07.31 [Question] Points On Globe Puzzle
• 2014.07.30 [Question] Nth Fibonacci Number In O(LogN)
• 2014.07.30 [Question] Peripheral Of A Complete Tree
• 2014.07.29 [Question] Which loop is faster
• 2014.07.29 [Question] Find Min & Max in an Array Using Minimum Comparisons
• 2014.07.29 [Question] Construct a BST from Preorder Traversal
• 2014.07.29 [Question] Remove chars in Pairs
• 2014.07.28 [Question] Breaking Chocolate Bars
• 2014.07.28 [Question] Check If Number Exists
• 2014.07.28 [Question] Matching Nuts And Bolts
• 2014.07.27 [LeetCode Plus] Coins in a Line
• 2014.07.27 [Question] Fit 1*2 Dominos In 2*N Strip
• 2014.07.27 [Question] Reconstruct Tree From Pre-Order Traversal
• 2014.07.27 [Question] Elephant And Bananas
• 2014.07.27 [LeetCode Plus] Sliding Window Maximum
• 2014.07.26 [Question] Random Number Generate Question
• 2014.07.26 [Testing] Test Number Divisibility
• 2014.07.26 [Question] Truth tell brain teaser
• 2014.07.26 [Design] Multithreading Q&A
• 2014.07.25 [Fundamental] Quickselect
• 2014.07.25 [Design] Semaphore Mutex Toilet Example
• 2014.07.25 [Question] Find 10001st Prime (Sieve of E)
• 2014.07.25 [Design] Big Data - Top k Frequency
• 2014.07.24 [Design] Multithreading Basics
• 2014.07.24 [Question] Find the first non-repeating character
• 2014.07.24 [LeetCode Plus] Convert BST to Circular DLL
• 2014.07.24 [Java OOP] Octal and Hexadecimal Numbers in Java
• 2014.07.23 [Question] Largest palindrome product
• 2014.07.23 [Question] Least Number after Deleting Digits
• 2014.07.23 [Question] Implement Stack using Two Queues
• 2014.07.22 [Question] Bucket Sort (bin sort)
• 2014.07.21 [Question] Longest Substring with At Most Two Distinct Characters
• 2014.07.21 [Java OOP] OOP - 4 major principles
• 2014.07.21 [Question] Quick Sort
• 2014.07.21 [Question] Max Binary Gap
• 2014.07.21 [Octopress] Clone Octopress Blog From A Different Computer
• 2014.07.13 [Design] Two's complement (2's complement)
• 2014.07.07 [NineChap 10] Additional Questions
• 2014.07.04 [Question] Check Power of 2
• 2014.07.04 [Question] Subarray with 0 Sum
• 2014.07.04 [Question] Subarray with Particular Sum
• 2014.07.04 [Question] Subarray with Sum Closest
• 2014.07.02 [LintCode] Trailing Zeros of Factorial
• 2014.07.01 [Design] HashMap vs Hashtable vs HashSet
• 2014.07.01 [Question] Implement a HashMap
• 2014.07.01 [Question] Implement Queue using Stacks
• 2014.07.01 [Question] Median in a stream of integers
• 2014.07.01 [Question] Min Stack
• 2014.07.01 [Question] The Skyline Problem
• 2014.06.30 [Question] Coin Change Problem
• 2014.06.30 [Question] Make a fair coin from a biased coin
• 2014.06.30 [Question] 0-1 Knapsack Problem
• 2014.06.30 [NineChap 9] Big Date, System Design and Resume (`)
• 2014.06.28 [LintCode] Majority Number II
• 2014.06.28 [LintCode] Majority Number III
• 2014.06.28 [LintCode] Majority Number
• 2014.06.28 [LintCode] Maximum Subarray II
• 2014.06.28 [LintCode] Minimum Subarray
• 2014.06.28 [NineChap 7] Data Structure
• 2014.06.28 [LintCode] Partition Array
• 2014.06.28 [Question] Single Number IV
• 2014.06.28 [NineChap 8] High Frequency Questions
• 2014.06.28 [Question] Single Number III
• 2014.06.27 [Question] Topology Sort
• 2014.06.27 [LintCode] Previous Permutation
• 2014.06.26 [NineChap 6] Graph and Search
• 2014.06.26 [Brain teaser] Khan Academy 8 brain teasers
• 2014.06.24 [LintCode] Longest Common Subsequence
• 2014.06.24 [LintCode] Longest Increasing Subsequence
• 2014.06.24 [NineChap 5.1] Dynamic Programming
• 2014.06.23 [Design] Cache and Page Replacement Algorithms
• 2014.06.18 [NineChap 4.2] Linked List Additional
• 2014.06.18 [Question] Number Sum Sequence
• 2014.06.18 [Brain teaser] 2 Eggs 100 Floors Puzzle
• 2014.06.17 [LeetCode Plus] Reverse linked list iteratively and recursively
• 2014.06.17 [Design] Time complexity calculation (Master theorem)
• 2014.06.17 [Question] Union and Intersection of two Linked Lists
• 2014.06.16 [LeetCode Plus] Binary Tree Serialize and Deserialize
• 2014.06.16 [NineChap 4.1] Linked List
• 2014.06.15 [Java OOP] Java Global Variable
• 2014.06.15 [NineChap 3.4] Binary Tree Additional
• 2014.06.15 [Question] Binary Search Tree find upper/lower bound
• 2014.06.14 [Question] Iterator of Binary Search Tree
• 2014.06.14 [Question] Count negative in a 2D Sorted Matrix
• 2014.06.14 [Java OOP] Java modifier and Access Level
• 2014.06.13 [Question] Search Range in BST (Trim a BST)
• 2014.06.12 [Question] Compare Mergesort and Quicksort
• 2014.06.12 [NineChap 1.2] Permutation
• 2014.06.11 [Design] BST Node Insertion / Deletion
• 2014.06.11 [NineChap 1.1] strStr and Coding Style
• 2014.06.10 [Question] First Character Appearing Only Once
• 2014.06.10 [LeetCode Plus] Lowest Common Ancestor of Binary Tree (II)
• 2014.06.10 [LeetCode Plus] Lowest Common Ancestor of Binary Tree (I)
• 2014.06.10 [LeetCode Plus] Lowest Common Ancestor of BST
• 2014.06.10 [NineChap 3.2] Binary Tree BFS
• 2014.06.10 [NineChap 3.3] Binary Search Tree
• 2014.06.10 [LeetCode Plus] Searching a 2D Sorted Matrix
• 2014.06.10 [NineChap 3.1] Binary Tree DFS and Divide Conquer
• 2014.06.09 [NineChap 2.2] Sorted Array
• 2014.06.08 [NineChap 2.1] Binary Search
• 2014.06.08 [LintCode] Recover Rotated Sorted Array
• 2014.06.05 [Testing] Software Testing
• 2014.06.04 [Question] ASCII, Utf-8, Utf-16 and Unicode
• 2014.06.04 [Question] Junit Hand-on Notes
• 2014.06.03 [Design] Implemention of DFS using a Stack
• 2014.06.03 [Design] Big Endian and Little Endian
• 2014.06.03 [LeetCode 150] Evaluate Reverse Polish Notation
• 2014.06.03 [LeetCode 146] LRU Cache
• 2014.06.03 [LeetCode 145] Binary Tree Postorder Traversal
• 2014.06.03 [LeetCode 149] Max Points on a Line
• 2014.06.03 [LeetCode 143] Reorder List
• 2014.06.03 [LeetCode 151] Reverse Words in a String
• 2014.06.02 [LeetCode 144] Binary Tree Preorder Traversal
• 2014.06.02 [LeetCode 138] Copy List with Random Pointer
• 2014.06.02 [LeetCode 142] Linked List Cycle II
• 2014.06.02 [LeetCode 141] Linked List Cycle
• 2014.06.02 [LeetCode 148] Sort List
• 2014.06.02 [LeetCode 139] Word Break
• 2014.06.02 [LeetCode 140] Word Break II
• 2014.06.01 [LeetCode 137] Single Number II
• 2014.06.01 [LeetCode 136] Single Number
• 2014.05.31 [LeetCode 135] Candy
• 2014.05.31 [LeetCode 134] Gas Station
• 2014.05.30 [LeetCode 133] Clone Graph
• 2014.05.30 [LeetCode 147] Insertion Sort List
• 2014.05.30 [LeetCode 126] Word Ladder II (unsolvable)
• 2014.05.30 [LeetCode 132] Palindrome Partitioning II
• 2014.05.29 [LeetCode 128] Longest Consecutive Sequence
• 2014.05.29 [LeetCode 131] Palindrome Partitioning
• 2014.05.29 [Design] DFS, BFS and space efficiency
• 2014.05.29 [LeetCode 130] Surrounded Regions
• 2014.05.29 [LeetCode 129] Sum Root to Leaf Numbers
• 2014.05.29 [LeetCode 127] Word Ladder
• 2014.05.28 [LeetCode 122] Best Time to Buy and Sell Stock II
• 2014.05.28 [LeetCode 123] Best Time to Buy and Sell Stock III
• 2014.05.28 [LeetCode 121] Best Time to Buy and Sell Stock
• 2014.05.28 [LeetCode 124] Binary Tree Maximum Path Sum
• 2014.05.28 [LeetCode 114] Flatten Binary Tree to Linked List
• 2014.05.28 [LeetCode 125] Valid Palindrome
• 2014.05.27 [LeetCode 106] Construct Binary Tree from Inorder and Postorder
• 2014.05.27 [LeetCode 115] Distinct Subsequences
• 2014.05.27 [LeetCode 105] Construct Binary Tree from Preorder and Inorder
• 2014.05.27 [LeetCode 113] Path Sum II
• 2014.05.27 [LeetCode 118] Pascal's Triangle
• 2014.05.27 [LeetCode 112] Path Sum
• 2014.05.27 [LeetCode 119] Pascal's Triangle II
• 2014.05.27 [LeetCode 117] Populating Next Right Pointers in Each Node II
• 2014.05.27 [LeetCode 116] Populating Next Right Pointers in Each Node
• 2014.05.27 [LeetCode 120] Triangle
• 2014.05.26 [LeetCode 110] Balanced Binary Tree
• 2014.05.26 [LeetCode 108] Convert Sorted Array to Binary Search Tree
• 2014.05.26 [LeetCode 109] Convert Sorted List to Binary Search Tree
• 2014.05.26 [LeetCode 96] Unique Binary Search Trees
• 2014.05.26 [LeetCode 95] Unique Binary Search Trees II
• 2014.05.26 [LeetCode 101] Symmetric Tree
• 2014.05.26 [LeetCode 98] Validate Binary Search Tree
• 2014.05.25 [LeetCode 107] Binary Tree Level Order Traversal II
• 2014.05.25 [LeetCode 103] Binary Tree Zigzag Level Order Traversal
• 2014.05.25 [LeetCode 104] Maximum Depth of Binary Tree
• 2014.05.25 [LeetCode 111] Minimum Depth of Binary Tree
• 2014.05.25 [LeetCode 99] Recover Binary Search Tree
• 2014.05.25 [LeetCode 100] Same Tree
• 2014.05.25 [LeetCode 102] Binary Tree Level Order Traversal
• 2014.05.24 [LeetCode 94] Binary Tree Inorder Traversal
• 2014.05.24 [LeetCode 97] Interleaving String
• 2014.05.24 [LeetCode 85] Maximal Rectangle
• 2014.05.24 [LeetCode 93] Restore IP Addresses
• 2014.05.23 [LeetCode 91] Decode Ways
• 2014.05.23 [LeetCode 89] Gray Code
• 2014.05.23 [LeetCode 88] Merge Sorted Array
• 2014.05.23 [LeetCode 86] Partition List
• 2014.05.23 [LeetCode 92] Reverse Linked List II
• 2014.05.23 [LeetCode 84] Largest Rectangle in Histogram
• 2014.05.23 [LeetCode 87] Scramble String
• 2014.05.22 [LeetCode 77] Combinations
• 2014.05.22 [LeetCode 80] Remove Duplicates from Sorted Array II
• 2014.05.22 [LeetCode 83] Remove Duplicates from Sorted List
• 2014.05.22 [LeetCode 82] Remove Duplicates from Sorted List II
• 2014.05.22 [LeetCode 90] Subsets II
• 2014.05.22 [LeetCode 81] Search in Rotated Sorted Array II
• 2014.05.22 [LeetCode 78] Subsets
• 2014.05.21 [LeetCode 67] Add Binary
• 2014.05.21 [LeetCode 70] Climbing Stairs
• 2014.05.21 [LeetCode 72] Edit Distance
• 2014.05.21 [LeetCode 74] Search a 2D Matrix
• 2014.05.21 [LeetCode 66] Plus One
• 2014.05.21 [LeetCode 76] Minimum Window Substring
• 2014.05.21 [LeetCode 73] Set Matrix Zeroes
• 2014.05.21 [LeetCode 71] Simplify Path
• 2014.05.21 [LeetCode 75] Sort Colors
• 2014.05.21 [LeetCode 69] Sqrt(x)
• 2014.05.21 [LeetCode 79] Word Search
• 2014.05.20 [LeetCode 53] Maximum Subarray
• 2014.05.20 [LeetCode 64] Minimum Path Sum
• 2014.05.20 [LeetCode 63] Unique Paths II
• 2014.05.20 [LeetCode 62] Unique Paths
• 2014.05.19 [LeetCode 60] Permutation Sequence
• 2014.05.19 [LeetCode 61] Rotate List
• 2014.05.18 [LeetCode 65] Valid Number (unsolvable)
• 2014.05.18 [LeetCode 68] Text Justification (unsolvable)
• 2014.05.18 [LeetCode 57] Insert Interval
• 2014.05.17 [LeetCode 56] Merge Intervals
• 2014.05.16 [LeetCode 55] Jump Game
• 2014.05.16 [LeetCode 51] N-Queens
• 2014.05.16 [LeetCode 58] Length of Last Word
• 2014.05.16 [LeetCode 52] N-Queens II
• 2014.05.16 [LeetCode 59] Spiral Matrix II
• 2014.05.16 [LeetCode 54] Spiral Matrix
• 2014.05.15 [LeetCode 50] Pow(x, n)
• 2014.05.15 [LeetCode 44] Wildcard Matching
• 2014.05.15 [LeetCode 49] Anagrams
• 2014.05.14 [LeetCode 41] First Missing Positive
• 2014.05.14 [LeetCode 43] Multiply Strings
• 2014.05.14 [LeetCode 45] Jump Game II
• 2014.05.14 [LeetCode 47] Permutations II
• 2014.05.14 [LeetCode 46] Permutations
• 2014.05.14 [LeetCode 48] Rotate Image
• 2014.05.14 [LeetCode 37] Sudoku Solver
• 2014.05.14 [LeetCode 42] Trapping Rain Water
• 2014.05.13 [LeetCode 40] Combination Sum II
• 2014.05.13 [LeetCode 39] Combination Sum
• 2014.05.13 [LeetCode 38] Count and Say
• 2014.05.12 [LeetCode 32] Longest Valid Parentheses
• 2014.05.12 [LeetCode 31] Next Permutation
• 2014.05.12 [LeetCode 35] Search Insert Position
• 2014.05.12 [LeetCode 34] Search for a Range
• 2014.05.12 [LeetCode 33] Search in Rotated Sorted Array
• 2014.05.12 [LeetCode 36] Valid Sudoku
• 2014.05.11 [LeetCode 23] Merge k Sorted Lists
• 2014.05.11 [LeetCode 25] Reverse Nodes in k-Groups
• 2014.05.11 [Fundamental] Heap (data structure)
• 2014.05.10 [LeetCode 28] Implement strStr
• 2014.05.10 [Fundamental] Java Bit Operation
• 2014.05.10 [Fundamental] Recap on Java HashMap
• 2014.05.10 [LeetCode 29] Divide Two Integers
• 2014.05.10 [LeetCode 30] Substring with Concatenation of All Words
• 2014.05.09 [LeetCode 22] Generate Parentheses
• 2014.05.09 [LeetCode 21] Merge Two Sorted Lists
• 2014.05.09 [LeetCode 26] Remove Duplicates from Sorted Array
• 2014.05.09 [LeetCode 27] Remove Element
• 2014.05.09 [LeetCode 24] Swap Nodes in Pairs
• 2014.05.09 [LeetCode 20] Valid Parentheses
• 2014.05.03 [LeetCode 18] 4Sum
• 2014.05.02 [LeetCode 16] 3Sum Closest
• 2014.05.02 [LeetCode 15] 3Sum
• 2014.05.02 [LeetCode 17] Letter Combinations of a Phone Number
• 2014.05.02 [LeetCode 19] Remove Nth Node From End of List
• 2014.05.01 [LeetCode 14] Longest Common Prefix
• 2014.04.30 [LeetCode 12] Integer to Roman
• 2014.04.30 [LeetCode 13] Roman to Integer
• 2014.04.29 [LeetCode 11] Container With Most Water
• 2014.04.29 [LeetCode 9] Palindrome Number
• 2014.04.29 [LeetCode 10] Regular Expression Matching
• 2014.04.29 [LeetCode 6] ZigZag Conversion
• 2014.04.29 [LeetCode 8] String to Integer (atoi)
• 2014.04.28 [LeetCode 5] Longest Palindromic Substring
• 2014.04.28 [LeetCode 7] Reverse Integer
• 2014.04.27 [LeetCode 2] Add Two Numbers
• 2014.04.27 [LeetCode 3] Longest Substring Without Repeating Characters
• 2014.04.26 [LeetCode 4] Median of Two Sorted Arrays
• 2014.04.26 [LeetCode 1] Two Sum
• 2014.04.25 LeetCode Statistics
• 2013.11.21 [Question] Insert Plus and Minus to Complete Expression
• 2013.11.21 [Question] Get Max Number Game (minmax + dp)
• 2013.11.20 [Amazon] Infix to Postfix conversion
• 2013.11.15 [Question] Count Arithmetic Slices
• 2013.11.15 [Question] Shuffle and Get Max Difference
• 2013.11.05 [Question] Number Of Bus Stations (meeting rooms)