Archives | Tech blog

IMDb Non-Commercial Datasets April 19, 2025

Install Resilio Sync in 2024 April 16, 2025

Nginx config in 2024 April 16, 2025

Hexo best practice in 2025 April 14, 2025

CircleCI auto deploy Github Pages April 14, 2025

Service-Oriented Architecture, SOAP and REST March 4, 2025

<Coursera> Reinforcement Learning 1 March 2, 2025

<Coursera> Reinforcement Learning 0 March 1, 2025

Deploy Github Pages in Year 2025 February 23, 2025

Node.js - how to use pnpm globally December 8, 2024

Python environment management December 5, 2024

Docker compose tutorial December 3, 2024

Blocking/non-blocking in Python with async/await December 1, 2024

One-line launch anything from Mac OS November 30, 2024

System Design 2024 - Amazon September 25, 2024

System Design 2024 - Bidding Platform September 25, 2024

Explain LLM in Simple Terms August 20, 2024

System Design 2024 - Robinhood August 9, 2024

System Design 2024 - Twitter July 29, 2024

System Design 2024 - TicketMaster July 29, 2024

System Design 2024 - Youtube July 29, 2024

TODO July 28, 2024

2285. Maximum Total Importance of Roads July 16, 2024

2341. Maximum Number of Pairs in Array July 16, 2024

445. Add Two Numbers II July 16, 2024

380. Insert Delete GetRandom O(1) July 16, 2024

Setup Zookeeper + Kafka in VMware July 16, 2024

1094. Car Pooling July 16, 2024

Maven tutorial January 16, 2023

Hackerrank - DigitalWallet December 2, 2022

RuntimeException and checked Exception December 1, 2022

347. Top K Frequent Elements December 1, 2022

543. Diameter of Binary Tree November 20, 2022

206. Reverse Linked List November 20, 2022

1628. Design an Expression Tree With Evaluate Function November 20, 2022

Java一些基础语法：Comparator, MapEntry, Iterator November 20, 2022

1152. Analyze User Website Visit Pattern November 20, 2022

277. Find the Celebrity November 18, 2022

285. Inorder Successor in BST November 18, 2022

472. Concatenated Words November 18, 2022

364. Nested List Weight Sum II November 18, 2022

339. Nested List Weight Sum November 18, 2022

1429. First Unique Number November 18, 2022

1428. Leftmost Column with at Least a One November 18, 2022

510. Inorder Successor in BST II November 18, 2022

System design cheat sheet November 17, 2022

Google questions November 17, 2022

System design questions November 15, 2022

Java Design Pattern November 15, 2022

207. Course Schedule November 15, 2022

394. Decode String November 15, 2022

695. Max Area of Island November 15, 2022

987. Vertical Order Traversal of a Binary Tree November 15, 2022

653. Two Sum IV - Input is a BST November 15, 2022

1046. Last Stone Weight November 15, 2022

1160. Find Words That Can Be Formed by Characters November 14, 2022

803. Bricks Falling When Hit November 14, 2022

2402. Meeting Rooms III November 14, 2022

683. K Empty Slots November 14, 2022

359. Logger Rate Limiter November 12, 2022

681. Next Closest Time November 12, 2022

545. Boundary of Binary Tree November 12, 2022

430. Flatten a Multilevel Doubly Linked List November 11, 2022

1854. Maximum Population Year November 10, 2022

2104. Sum of Subarray Ranges November 9, 2022

719. Find K-th Smallest Pair Distance November 9, 2022

948. Bag of Tokens November 9, 2022

739. Daily Temperatures November 9, 2022

773. Sliding Puzzle November 9, 2022

662. Maximum Width of Binary Tree November 9, 2022

240. Search a 2D Matrix II November 9, 2022

241. Different Ways to Add Parentheses November 9, 2022

158. Read N Characters Given read4 II - Call Multiple Times November 9, 2022

2259. Remove Digit From Number to Maximize Result November 8, 2022

1567. Maximum Length of Subarray With Positive Product November 8, 2022

2221. Find Triangular Sum of an Array November 8, 2022

2006. Count Number of Pairs With Absolute Difference K November 8, 2022

1710. Maximum Units on a Truck November 8, 2022

1153. String Transforms Into Another String November 8, 2022

1405. Longest Happy String November 8, 2022

163. Missing Ranges November 8, 2022

1652. Defuse the Bomb November 8, 2022

238. Product of Array Except Self November 8, 2022

253. Meeting Rooms II November 8, 2022

261. Graph Valid Tree November 8, 2022

269. Alien Dictionary November 8, 2022

276. Paint Fence November 8, 2022

311. Sparse Matrix Multiplication November 8, 2022

340. Longest Substring with At Most K Distinct Characters November 8, 2022

346. Moving Average from Data Stream November 8, 2022

366. Find Leaves of Binary Tree November 8, 2022

418. Sentence Screen Fitting November 8, 2022

523. Continuous Subarray Sum November 8, 2022

642. Design Search Autocomplete System November 8, 2022

1662. Check If Two String Arrays are Equivalent November 8, 2022

244. Shortest Word Distance II November 8, 2022

1123. Lowest Common Ancestor of Deepest Leaves November 8, 2022

1143. Longest Common Subsequence November 8, 2022

1249. Minimum Remove to Make Valid Parentheses November 8, 2022

1254. Number of Closed Islands November 8, 2022

1302. Deepest Leaves Sum November 8, 2022

1326. Minimum Number of Taps to Open to Water a Garden November 8, 2022

1352. Product of the Last K Numbers November 8, 2022

1423. Maximum Points You Can Obtain from Cards November 8, 2022

1654. Minimum Jumps to Reach Home November 8, 2022

17.12. BiNode LCCI November 8, 2022

1712. Ways to Split Array Into Three Subarrays November 8, 2022

1769. Minimum Number of Operations to Move All Balls to Each Box November 8, 2022

1864. Minimum Number of Swaps to Make the Binary String Alternating November 8, 2022

202. Happy Number November 8, 2022

2096. Step-By-Step Directions From a Binary Tree Node to Another November 8, 2022

210. Course Schedule II November 8, 2022

222. Count Complete Tree Nodes November 8, 2022

2290. Minimum Obstacle Removal to Reach Corner November 8, 2022

234. Palindrome Linked List November 8, 2022

236. Lowest Common Ancestor of a Binary Tree November 8, 2022

295. Find Median from Data Stream November 8, 2022

331. Verify Preorder Serialization of a Binary Tree November 8, 2022

417. Pacific Atlantic Water Flow November 8, 2022

440. K-th Smallest in Lexicographical Order November 8, 2022

463. Island Perimeter November 8, 2022

547. Number of Provinces November 8, 2022

622. Design Circular Queue November 8, 2022

655. Print Binary Tree November 8, 2022

710. Random Pick with Blacklist November 8, 2022

875. Koko Eating Bananas November 8, 2022

981. Time Based Key-Value Store November 8, 2022

993. Cousins in Binary Tree November 8, 2022

727. Minimum Window Subsequence November 4, 2022

1740. Find Distance in a Binary Tree November 4, 2022

250. Count Univalue Subtrees November 4, 2022

937. Reorder Data in Log Files November 2, 2022

994. Rotting Oranges November 2, 2022

224. Basic Calculator November 1, 2022

MyBatis and SSM (Spring/SpringMVC/MyBatis) November 1, 2022

Redis (NoSQL) Cache October 31, 2022

SpringMVC learning notes October 31, 2022

1366. Rank Teams by Votes October 30, 2022

MySql (3) - Sharding October 30, 2022

MySql (2) - Master/slave October 30, 2022

MySql (4) - Performance Optimization October 30, 2022

MySql (1) - Indexing, Locking and Transaction October 30, 2022

Java Spring framework October 30, 2022

并查集 (261. Graph Valid Tree) October 29, 2022

221. Maximal Square October 29, 2022

239. Sliding Window Maximum October 29, 2022

264. Ugly Number II October 29, 2022

299. Bulls and Cows October 29, 2022

396. Rotate Function October 29, 2022

426. Convert Binary Search Tree to Sorted Doubly Linked List October 29, 2022

652. Find Duplicate Subtrees October 29, 2022

692. Top K Frequent Words October 29, 2022

696. Count Binary Substrings October 29, 2022

769. Max Chunks To Make Sorted October 29, 2022

785. Is Graph Bipartite? October 29, 2022

797. All Paths From Source to Target October 29, 2022

983. Minimum Cost For Tickets October 29, 2022

【Tech】 Joplin Tutorial May 28, 2022

【Tech】 APT hold back a package from updating May 9, 2022

【Tech】 Run Jellyfin server on Windows May 5, 2022

【Tech】 Check Folder Size on Linux April 27, 2022

【Tech】 Mint Linux - remove Xfce and install Cinnamon April 27, 2022

【Tech】 MP3 compression April 26, 2022

【Tech】 Gnome extension - Gnomenu April 24, 2022

【Tech】 Gnome extension - Internet Radio April 24, 2022

【Tech】 VSCode： copy all search results April 20, 2022

【Tech】 Check which desktop environment is running on Linux April 19, 2022

【Tech】 curl download a batch of files on Linux April 19, 2022

【Tech】 Remove Libre Office from Linux April 19, 2022

【Tech】 Create Link using 'ln' in Linux April 18, 2022

【Tech】 Pop!_OS install Sunloginclient April 17, 2022

【Tech】 Chromebook Tutorial 5 - v2ray on GalliumOS April 16, 2022

【Tech】 Linux Kernel version April 16, 2022

【Tech】 XFCE panel config April 9, 2022

【Tech】 Debian 9/10 minimal April 1, 2022

【Tech】 Chromebook Tutorial 4 - Using GalliumOS March 29, 2022

【Tech】 Chromebook Tutorial 3 - Install GalliumOS March 28, 2022

【Tech】 Chromebook Tutorial 2 - Linux (Crostini) March 26, 2022

【Tech】 Install Resilio Sync on Linxu / ChromeOS March 25, 2022

【Tech】 Tmux and Mosh March 11, 2022

【Tech】 Download all MP3 files in RSS feed March 1, 2022

【Tech】 How to mount shared folder for VirtualBox January 10, 2022

【Tech】 Install Joplin on Linux November 4, 2021

【Tech】 Amlogic 晶晨芯片刷机教程 November 3, 2021

【Tech】 Install OpenMediaVault on Debian October 19, 2021

【Tech】 Armbian day to day 使用教程 October 19, 2021

【Tech】 Debian 9 (Armbian) on N1/Wky 使用教程 October 15, 2021

【Tech】不足百元的 Nas 矿渣机对比 September 27, 2021

【Tech】 VPN / Trojan on Ubuntu / Linux September 14, 2021

【Tech】 Mount APFS September 13, 2021

【Tech】 Install Wechat on Ubuntu September 12, 2021

【Tech】 Install Jdk / Java on Linux September 5, 2021

【Tech】 Install Python/pip on Ubuntu 20.04 September 4, 2021

【Tech】 Install Golang on Ubuntu 20.04 September 3, 2021

【Tech】 Install MySQL 5.7 on Ubuntu 20.04 September 2, 2021

【Tech】 Install Node/npm using Nvm September 1, 2021

【Tech】 Ubuntu System Commands August 13, 2021

【Tech】 CentOS 7 Commands July 1, 2021

【Tech】 How to compress VDI file for VirtualBox December 1, 2020

[Question] Trie Wildcard String Matching May 22, 2017

[Question] Dutch national flag problem May 13, 2017

[Design] How to Design Logging August 1, 2016

[Design] MVC, MVP and MVVM July 31, 2016

[Design] Design Twitter July 11, 2016

[Octopress] Add Aside Content to Octopress June 11, 2016

[Design] User Registry Table Design May 8, 2016

[Design] Designing a simple web crawler November 22, 2015

[Design] How to generate Maze November 21, 2015

[Question] Swizzle Sort November 21, 2015

[Design] Strategy design pattern November 18, 2015

[Question] Partition Problem (divide array into halves) November 15, 2015

[LeetCode 188] Best Time to Buy and Sell Stock IV November 4, 2015

[Java OOP] Java ArrayList implementation October 28, 2015

[Java OOP] Template method pattern (abstract class) October 23, 2015

[Java OOP] Java Vector and ArrayList October 23, 2015

[Java OOP] What is Java Exception October 23, 2015

[Java OOP] Static class and Inner class October 23, 2015

[Java OOP] Why avoid using Protected? October 22, 2015

[Fundamental] What is a Literal? October 22, 2015

[Fundamental] Polynomial, quadratic, cubic and exponential October 22, 2015

[Fundamental] Reflexive, Symmetric and Transitive Rules October 22, 2015

[Fundamental] UML Class Diagrams October 14, 2015

[LintCode] Segment Tree Build II October 13, 2015

[LintCode] Segment Tree Build October 13, 2015

[LintCode] Segment Tree Modify October 13, 2015

[LintCode] Segment Tree Query II October 13, 2015

[LintCode] Segment Tree Query October 13, 2015

[Fundamental] Segment Tree October 8, 2015

[Amazon] All Strings by Placing Spaces October 7, 2015

[Question] Find Cloest Leaf in Binary Tree October 7, 2015

[Question] Largest Sub-square with Edges filled October 7, 2015

[Fundamental] The 7 Bridges Problem October 4, 2015

[Google] Shortest Manhattan Distance October 2, 2015

【Tech】 SQL learning notes September 20, 2015

[Design] Facebook Photo Storage September 2, 2015

[NineChap System Design] Class 4.1: Crawler August 30, 2015

[NineChap System Design] Class 4.2: Search Engine August 30, 2015

[Design] How Google search works August 30, 2015

[NineChap System Design] Class 3.1: Web Service August 28, 2015

[NineChap System Design] Class 3.2: Web Service August 28, 2015

[NineChap System Design] Class 2.1: Database August 26, 2015

[NineChap System Design] Class 2.2: Database August 26, 2015

[Java OOP] Three Properties of Class/Object August 24, 2015

[NineChap System Design] Class 1.1: Overview August 23, 2015

[NineChap System Design] Class 1.2: An Example August 23, 2015

[NineChap System Design] Class 1.3: Improvement August 23, 2015

【Tech】Operating System learning notes August 10, 2015

[Design] How is Pipe implemented in Unix/Linux July 23, 2015

[Design] Cryptographic standard, AES and RSA June 9, 2015

[Design] Linux and TCP ports June 8, 2015

【Tech】 HTTP learning notes (1/3) all about http June 6, 2015

【Tech】 HTTP learning notes (2/3) security June 6, 2015

【Tech】 PHP learning notes May 31, 2015

【Tech】 Python learning notes May 31, 2015

【Tech】 Regular Expression Learning Notes May 24, 2015

[Java OOP] Overload, Override, Compile, Runtime (Static/Dynamic Polymph) May 24, 2015

[Palantir] Sort Letters Given Lexicographic Order May 21, 2015

【Tech】 SSH keys setup for GitHub May 14, 2015

[LeetCode 199] Binary Tree Right Side View May 10, 2015

[LeetCode 201] Bitwise AND of Numbers Range May 10, 2015

[LeetCode 198] House Robber May 10, 2015

[LeetCode 191] Number of 1 Bits May 10, 2015

[LeetCode 200] Number of Islands May 10, 2015

[LeetCode 190] Reverse Bits May 10, 2015

[LeetCode 189] Rotate Array May 10, 2015

[LeetCode 187] Repeated DNA Sequences May 1, 2015

【Tech】 Nginx tutorial April 30, 2015

【Tech】 Linux Directory Structure April 28, 2015

【Tech】 Quick setup guide of Ghost on VPS April 27, 2015

【Tech】 Git Learning Notes April 26, 2015

【Tech】 Vi tutorial April 24, 2015

[LeetCode 173] Binary Search Tree Iterator April 15, 2015

[LeetCode 174] Dungeon Game April 15, 2015

[LeetCode 179] Largest Number April 15, 2015

[LeetCode 168] Excel Sheet Column Title April 14, 2015

[LeetCode 169] Majority Element April 14, 2015

[Question] 编程之美 NIM 一排石头的游戏 April 14, 2015

[UVa] Wooden Sticks April 14, 2015

[LeetCode 171] Excel Sheet Column Number April 13, 2015

[LeetCode 172] Factorial Trailing Zeroes April 13, 2015

[LeetCode 164] Maximum Gap April 13, 2015

[LeetCode 165] Compare Version Numbers April 12, 2015

[LeetCode 162] Find Peak Element April 12, 2015

[Palantir] Find Duplicate within K Distance April 12, 2015

[Palantir] MultiMap in Java without using Collections April 12, 2015

[LeetCode 166] Fraction to Recurring Decimal April 11, 2015

[LeetCode 160] Intersection of Two Linked Lists April 8, 2015

[LeetCode 154] Find Minimum in Rotated Sorted Array II April 7, 2015

[LeetCode 153] Find Minimum in Rotated Sorted Array April 7, 2015

[LeetCode 152] Maximum Product Subarray April 7, 2015

[LeetCode 155] Min Stack April 7, 2015

[Octopress] Add Google AdSense to Octopress April 7, 2015

[Design] HBase and HDFS February 15, 2015

[Design] Speed Up Webpage for Slow Connection (1) February 14, 2015

[Design] Speed Up Webpage for Slow Connection (2) February 14, 2015

[Design] Speed Up Webpage for Slow Connection (3) February 14, 2015

[Design] Speed Up Webpage for Slow Connection (4) February 14, 2015

[LinkedIn] Sum of integer weighted by depth February 13, 2015

[LinkedIn] Unique combination of factors (因式分解) February 13, 2015

[Google] Minimum adjustments February 13, 2015

[LinkedIn] Sort part to make entire array sorted February 13, 2015

[LinkedIn] Executive's Schedule February 12, 2015

[Design] Application Server vs. Web Server February 11, 2015

[LinkedIn] Isomorphic Strings February 11, 2015

[Design] Design Cache System (`) February 10, 2015

[Java OOP] Can abstract class have constructor February 9, 2015

[Java OOP] Can abstract class have 0 abstract method? February 9, 2015

[Google] Array Signature February 9, 2015

[Question] Count multiples of array February 9, 2015

[Google] Heap and BST conversion February 9, 2015

[Design] Intro to Google Spanner February 9, 2015

[Google] Number of slices February 9, 2015

[Design] Big Data - Find Common Elements in 2 Lists February 8, 2015

[Google] BST find ceiling February 8, 2015

[Design] Difference: Internet and the Web February 8, 2015

[Design] Find similar library books February 8, 2015

[Facebook] Generate number with Given probability February 8, 2015

[Google] Transform a unbalanced tree into balanced tree February 8, 2015

[Question] Check string with no common letters (Bitmask) February 7, 2015

[Google] Continental divider February 7, 2015

[Google] First Unique URL February 7, 2015

[Google] Max prodcut of strings that have no common char February 7, 2015

[Design] Multithreading Async Increment Problem February 7, 2015

[Question] Reservoir sampling February 7, 2015

[Google] Implement a Blocking Queue February 5, 2015

[Google] Multi-server Messaging System February 5, 2015

[Java OOP] PubSub (Publish–subscribe) pattern February 5, 2015

[Google] Set Cover Problem February 5, 2015

[Design] Winning Games Rank (pagerank) February 5, 2015

[Google] Collatz Conjecture (Oneness property) February 4, 2015

[Google] Data Structure of Insert, Remove, GetRandom February 4, 2015

[Amazon] Grep command interview question February 4, 2015

[Google] Number of subtrees with even nodes February 4, 2015

[Google] Snakes and ladders February 4, 2015

[Design] Monitor Rps for Past sec/min/hr February 3, 2015

[Greedy] Activity Selection Problem February 1, 2015

[Greedy] Each Employee 2 events February 1, 2015

[Design] Limit the Request per Second February 1, 2015

[Question] Stock Span Problem (couting BST) February 1, 2015

[Question] 2D Bin Packing January 30, 2015

[Question] Packing Rectangles January 29, 2015

[Apple] Calculate Area January 29, 2015

[Question] Product Array Puzzle January 29, 2015

[Fundamental] Implement Trie and Suffix Tree January 28, 2015

[Question] Two Dimensional Knapsack Problem January 28, 2015

[Google] Generate Request ID January 27, 2015

[Fundamental] Pattern Searching Algorithms January 27, 2015

[Fundamental] Prefix Tree January 27, 2015

[Fundamental] Suffix Array January 27, 2015

[Fundamental] Suffix Tree January 27, 2015

[Question] Push and Pop Sequences of Stacks January 26, 2015

[Google] Make a Java method thread-safe January 26, 2015

[Design] Design Google Suggest (autocomplete) January 24, 2015

[Design] Distributed Caching - memcached January 24, 2015

[Palantir] Largest basin size in matrix January 20, 2015

[Design] Difference between HTTP and HTTPS January 20, 2015

[Java OOP] Interface and Abstract classes January 20, 2015

[Java OOP] Java Vector and ArrayList January 20, 2015

[Google] Top n values from Sum of 2 arrays January 20, 2015

[Question] Check if two line segments intersect January 19, 2015

[Question] Check if given point inside polygon January 19, 2015

[Design] Difference between HTTP protocol and TCP protocol January 19, 2015

[Amazon] Lexicographic rank of a string January 18, 2015

[Google] Lexicographic order (letter replacement) of dictionary January 18, 2015

[Question] Maximum square sub-matrix with all 1s January 18, 2015

[Amazon] Find nodes of distance k from Binary Tree January 17, 2015

[Java OOP] BlockingQueue and Thread Pool January 12, 2015

[Java OOP] Java BlockingQueue (1) January 12, 2015

[Java OOP] Java BlockingQueue (2) January 12, 2015

[Google] Diameter of a Binary Tree January 11, 2015

[Question] All distinct subsequences with given length January 11, 2015

[LinkedIn] Find all repeating substring with given length January 11, 2015

[Google] Check if repeating subsequence exists January 11, 2015

[Google] Crazy Distance Between Strings January 11, 2015

[Amazon] Longest Repeating Substring January 11, 2015

[Question] Number of distinct sub-sequence January 11, 2015

[Question] Number of occurence of given sub-sequence January 11, 2015

[Google] Form a Queue Given Heights January 10, 2015

[Google] Maximum Count Array in a Queue January 10, 2015

[Amazon] Mininum Range that includes at least One January 10, 2015

[Google] Reverse a Stack without DS January 10, 2015

[Design] Real Time Top k January 9, 2015

[Design] Big Data - Top k Frequency (hands-on) January 9, 2015

[Amazon] Match triplet with reverse order January 9, 2015

[Question] Most Frequent Word from a book January 9, 2015

[Design] Terminology: n-gram January 9, 2015

[Google] Check all numbers given the decimal scale January 8, 2015

[Google] Number of distinct substrings January 8, 2015

[Design] P2P Technology January 7, 2015

[Question] Longest Common Substring January 7, 2015

[Facebook] Scheduling Jobs with Max Cost January 7, 2015

[Facebook] Write a Json prettifier January 6, 2015

[Design] Big Data Storage January 6, 2015

[Design] Cloud, Grid and Cluster January 6, 2015

[Design] Distributed hash table January 6, 2015

[Question] Frog Crossing (dynamic programming) January 2, 2015

[Design] Database Indexing December 27, 2014

[Ruby] Endless error with gem dependencies December 23, 2014

[Java OOP] Java Runtime Exception December 23, 2014

[Java OOP] Discussion of Polymorphism December 22, 2014

[Facebook] Maximum sum such that no two elements are adjacent December 22, 2014

[Ruby] RubyGems, gem, Gemfile and Bundler December 22, 2014

[Question] Split an integer or coin December 22, 2014

[Java OOP] Interface extend another Interface December 22, 2014

[Java OOP] Common Root of Java Classes December 22, 2014

[Java OOP] Override/overload Java main method December 22, 2014

[Facebook] Binary Search Tree 3Sum December 18, 2014

[Facebook] Print a Binary Tree in Vertical Order December 17, 2014

[Question] Equilibrium Points in 2D Array December 17, 2014

[Epic] Patient Disease Data Structure December 8, 2014

[Question] Axis Aligned Rectangles December 2, 2014

[Question] Multiples of 3 and 5 November 30, 2014

[Google] Code a HashMap November 4, 2014

[Question] Find row with most 1s November 1, 2014

[Question] Interleave Positive and Negative Numbers October 8, 2014

[CC150v5] 18.7 Longest Word Made From Other Words October 2, 2014

[CC150v5] 17.14 Optimal Way to Unconcatenate Doc October 1, 2014

[CC150v5] 17.13 Convert BST to DLL September 30, 2014

[CC150v5] 11.8 Get Rank in Stream of Integers September 28, 2014

[CC150v5] 17.6 Order an Array by Sorting Middle September 27, 2014

[CC150v5] 14.6 Implement CircularArray in Java September 26, 2014

[CC150v5] 11.4 Sort 20GB File September 24, 2014

[CC150v5] 12.0 Example - Troubleshoot Google Chrome September 24, 2014

[CC150v5] 9.3 Find Magic Index September 17, 2014

[CC150v5] 9.7 Paint Fill in Map September 17, 2014

[CC150v5] 9.11 Parenthesize the Expression September 17, 2014

[CC150v5] 9.10 Stack up the Boxes September 17, 2014

[CC150v5] 5.1 Binary Merge 2 Numbers September 16, 2014

[Brain teaser] 6.1 Bottles of Pills September 16, 2014

[CC150v5] 5.5 Calculate Bits Conversion Required September 16, 2014

[Google] Guess Password September 16, 2014

[CC150v5] 5.6 Swap Odd and Even Bits September 16, 2014

[CC150v5] 3.0 Example - Implement Stack September 15, 2014

[CC150v5] 2.7 Linked List Palindrome September 15, 2014

[CC150v5] 3.2 Stack Min Value September 15, 2014

[CC150v5] 3.7 Stack of Animals September 15, 2014

[CC150v5] 2.2 Kth last element (recursive) September 14, 2014

[Design] DNS Communication Protocol September 12, 2014

[Google] Length of Longest Arithmetic Progression (LLAP) September 11, 2014

[Google] Arithmetic Progression Triplet September 11, 2014

[Google] Barrier, Goods Van and Distance September 11, 2014

[Question] Celebrity Problem September 11, 2014

[CC150v4] 20.4 Count 2s in Digits September 10, 2014

[CC150v4] 20.11 Find Subsquare with Black Border September 10, 2014

[CC150v4] 20.8 Full Text Search (suffix tree) September 10, 2014

[CC150v4] 20.3 Generate M int from Array of Size N September 10, 2014

[CC150v4] 20.12 Sub-matrix with Largest Sum September 10, 2014

[CC150v4] 20.6 Top Million from Billion September 10, 2014

[Google] Winner of tic-tac-toe September 9, 2014

[CC150v4] 19.6 Convert Integer to English September 9, 2014

[CC150v4] 19.4 Get Max Number without Comparator September 9, 2014

[CC150v4] 10.6 Find Collinear in 2D Plane September 8, 2014

[CC150v4] 10.4 Implement Mathematical Operators September 8, 2014

[CC150v4] 14.3 Java Final, Finally and Finalize September 8, 2014

[CC150v4] 14.2 Java Finally Statement September 8, 2014

[CC150v4] 14.6 Java HashMap Counter September 8, 2014

[CC150v4] 14.1 Java Private Constructor September 8, 2014

[CC150v4] 14.5 Java Reflection September 8, 2014

[CC150v4] 11.2 Random error debugging 2 September 8, 2014

[CC150v4] 15.1 SQL count and group by statement September 8, 2014

[CC150v4] 15.2 SQL Types of Join September 8, 2014

[CC150v4] 11.4 Test Webpage without Tools September 8, 2014

[CC150v4] 5.2 Convert Integer to Binary Form September 7, 2014

[Brain teaser] 6.2 Cover the Chess Board September 7, 2014

[CC150v4] 5.7 Find Missing Number September 7, 2014

[CC150v4] 8.4 Generate Permutation Recursively September 7, 2014

[CC150v4] 9.5 Search Array Containing Empty String September 7, 2014

[CC150v4] 9.0 Example - Sort Persons September 7, 2014

[Google] Form a Palindrome with Insertion September 6, 2014

[CC150v4] 4.7 Check Subtree September 6, 2014

[CC150v4] 4.5 Find Next Node in BST September 6, 2014

[CC150v4] 3.4 Towers of Hanoi September 6, 2014

[CC150v4] 4.8 Print Path Sum to Value September 6, 2014

[CC150v4] 3.6 Sort Stack September 6, 2014

[Google] Find Second Shortest Path September 4, 2014

[Google] Unsolved Mystery of UTF8 Encoding September 4, 2014

[Design] Leader Election September 3, 2014

[Google] String Replacement Question September 3, 2014

[Google] Weird Sort Array September 3, 2014

[Google] Array Distance A(i)+A(j)+(j-i) September 2, 2014

[Google] Find Anagrams in Dictionary September 2, 2014

[Java OOP] Observer pattern September 2, 2014

[Google] Crosswod Solver September 1, 2014

[Facebook] Hamming Distance of Array September 1, 2014

[Design] Multithreading - Deadlock Prevention September 1, 2014

[Fundamental] A-Star Search August 30, 2014

[Design] Cryptographic Hash, MD5 and Digital signature August 30, 2014

[Fundamental] Min-Max Algorithm (minmax) August 30, 2014

[Fundamental] Travelling salesman problem August 30, 2014

[Google] Boggle Solver (search words from matrix) August 29, 2014

[Design] HTTP cookie August 28, 2014

[Google] Google Pre-interview Coaching August 28, 2014

[CC150v4] 10.7 Ugly Numbers (Hamming numbers) August 28, 2014

[Twitter] Count Visible Nodes in Binary Tree August 27, 2014

[Question] Duplicate Rows in Matrix August 27, 2014

[Google] Google API read4096 (read4K) August 27, 2014

[Twitter] Largest Cycle in Permutation August 27, 2014

[Design] OOD Design of Elevator August 26, 2014

[Testing] Test hashCode() function August 26, 2014

[Design] Virtual Memory, Page Fault and Thrashing August 26, 2014

[CC150v5] 8.10 Implement a Hashmap August 25, 2014

[CC150v5] 8.9 Design a in-memory File System August 25, 2014

[CC150v5] 8.4 Design a Parking Lot August 25, 2014

[CC150v5] 8.7 Design Online Chat Server (1) August 24, 2014

[CC150v5] 8.7 Design Online Chat Server (2) August 24, 2014

[CC150v5] 8.8 Design Othello Game August 24, 2014

[Design] Merits of BST over HashTables August 23, 2014

[Design] Shared Hosting vs. VPS Hosting August 23, 2014

[Design] Stack and Heap August 23, 2014

[CC150v5] 8.1 Design a Generic Deck of Cards August 22, 2014

[Question] Count Set Bit in Binary Number August 20, 2014

[Question] Ways of Dice Throw August 20, 2014

[Question] Square Count of Matchstick Graph August 20, 2014

[Java OOP] Singleton, 3 implementations August 20, 2014

[Question] Count Level in Perfect Binary Tree August 19, 2014

[Java OOP] Factory Pattern August 19, 2014

[Java OOP] Singleton Pattern Introduction August 19, 2014

[Twitter] Arithmetic Expression Evaluation August 17, 2014

[ItInt5] Number of Valid Trees Given Preorder and Postorder August 17, 2014

[ItInt5] Numbers Concatenation Max (Largest Number) August 17, 2014

[ItInt5] Excel Decimal Conversion August 16, 2014

[Google] Orthogonal Traverse the Map (`) August 16, 2014

[Google] Alphabet Table (`) August 15, 2014

[Question] Greatest Common Divisor August 15, 2014

[ItInt5] 跳马问题加强版 August 15, 2014

[Google] Product All 1s August 15, 2014

[Facebook] Task Scheduling Question August 15, 2014

[Facebook] Query Search (HashMap, suffix array) August 14, 2014

[Design] From Client/Server to Multi-Tier August 12, 2014

[CC150v4] 9.7 Circus Tower Routine August 12, 2014

[Google] Count Complete Binary Tree August 11, 2014

[Design] TCP 3-Way Handshake August 11, 2014

[ItInt5] Maximum circular subarray sum August 11, 2014

[Design] Big Data - Remove Duplicate Numbers August 10, 2014

[Design] Big Data - Top k Frequency (case analysis) August 10, 2014

[Design] Big Data - Find Existence of a Number August 10, 2014

[Design] Big Data - Find Median Numbers August 10, 2014

[Design] Big Data - Fuzzy Search url (Bloom Filter) August 10, 2014

[Design] Functional programming August 9, 2014

[Design] Median of array in Distributed Computers August 9, 2014

[Design] Process VS. Thread August 9, 2014

[Testing] Test Command Line Copy August 9, 2014

[Question] Add Integers without +/++ August 8, 2014

[Design] Composition Over Inheritance August 8, 2014

[Question] Decimal to Hexadecimal August 8, 2014

[Question] Max Sum Of Non-Consecutive Elements August 8, 2014

[Design] Producer Consumer Problem August 8, 2014

[Java OOP] Thread pool pattern August 8, 2014

[Design] Distributed Network Bottleneck August 7, 2014

[Google] Million Phone Numbers August 7, 2014

[Testing] Random error debugging 1 August 7, 2014

[CC150v4] 9.4 Sort Large Files August 7, 2014

[Google] Connect Graph Nodes and Avoid Intersect August 6, 2014

[Design] HTTP Headers August 6, 2014

[Design] Networks and TCP/IP August 6, 2014

[Google] Postorder successor in Binary Tree August 6, 2014

[Design] Amazon Web Services August 5, 2014

[Design] MapReduce Common Friends Example August 5, 2014

[Design] MapReduce Intro August 5, 2014

[Google] Replace Question Mark With Number August 5, 2014

[Java OOP] Upcasting, Downcasting and Object Slicing August 5, 2014

[Google] Write a Random Number Generator August 5, 2014

[Question] Print Numbers containing 5 August 5, 2014

[Google] Find Nearest Point in a 2D Space August 4, 2014

[Google] Find Occurance Greater Than Index August 4, 2014

[Design] Hadoop cluster August 4, 2014

[Design] Model–view–controller (MVC) August 4, 2014

[Design] Overview of Big Data Technology August 4, 2014

[Google] Traveller Path Problem August 4, 2014

[Google] Design Solar System (`) August 3, 2014

[Design] Multilayered architecture August 3, 2014

[Google] Three Keys Data Structure August 3, 2014

[CC150v4] 17.1 Type a URL in Browser and Hit Enter August 3, 2014

[Google] Print string comparison order August 2, 2014

[Google] Special increasing adjacent sequence August 2, 2014

[Question] Arranging Sequence August 1, 2014

[Question] Max Sum In A 2D Array (sub-matrix) August 1, 2014

[Question] Overriding private method August 1, 2014

[Question] Shuffle An Array (Fisher–Yates) August 1, 2014

[Question] Inorder Successor in Binary Search Tree July 31, 2014

[Question] Points On Globe Puzzle July 31, 2014

[Question] Run-Length Encoding July 31, 2014

[Question] Nth Fibonacci Number In O(LogN) July 30, 2014

[Question] Peripheral Of A Complete Tree July 30, 2014

[Question] Construct a BST from Preorder Traversal July 29, 2014

[Question] Find Min & Max in an Array Using Minimum Comparisons July 29, 2014

[Question] Remove chars in Pairs July 29, 2014

[Question] Which loop is faster July 29, 2014

[Question] Breaking Chocolate Bars July 28, 2014

[Question] Check If Number Exists July 28, 2014

[Question] Matching Nuts And Bolts July 28, 2014

[LeetCode Plus] Coins in a Line July 27, 2014

[Question] Elephant And Bananas July 27, 2014

[Question] Fit 1*2 Dominos In 2*N Strip July 27, 2014

[Question] Reconstruct Tree From Pre-Order Traversal July 27, 2014

[LeetCode Plus] Sliding Window Maximum July 27, 2014

[Design] Multithreading Q&A July 26, 2014

[Question] Random Number Generate Question July 26, 2014

[Testing] Test Number Divisibility July 26, 2014

[Question] Truth tell brain teaser July 26, 2014

[Question] Find 10001st Prime (Sieve of E) July 25, 2014

[Fundamental] Quickselect July 25, 2014

[Design] Semaphore Mutex Toilet Example July 25, 2014

[Design] Big Data - Top k Frequency July 25, 2014

[LeetCode Plus] Convert BST to Circular DLL July 24, 2014

[Question] Find the first non-repeating character July 24, 2014

[Design] Multithreading Basics July 24, 2014

[Java OOP] Octal and Hexadecimal Numbers in Java July 24, 2014

[Question] Largest palindrome product July 23, 2014

[Question] Least Number after Deleting Digits July 23, 2014

[Question] Implement Stack using Two Queues July 23, 2014

[Question] Bucket Sort (bin sort) July 22, 2014

[Octopress] Clone Octopress Blog From A Different Computer July 21, 2014

[Question] Longest Substring with At Most Two Distinct Characters July 21, 2014

[Java OOP] OOP - 4 major principles July 21, 2014

[Question] Quick Sort July 21, 2014

[Question] Max Binary Gap July 21, 2014

[Design] Two's complement (2's complement) July 13, 2014

[NineChap 10] Additional Questions July 7, 2014

[Question] Check Power of 2 July 4, 2014

[Question] Subarray with 0 Sum July 4, 2014

[Question] Subarray with Particular Sum July 4, 2014

[Question] Subarray with Sum Closest July 4, 2014

[LintCode] Trailing Zeros of Factorial July 2, 2014

[Design] HashMap vs Hashtable vs HashSet July 1, 2014

[Question] Implement a HashMap July 1, 2014

[Question] Implement Queue using Stacks July 1, 2014

[Question] Median in a stream of integers July 1, 2014

[Question] Min Stack July 1, 2014

[Question] The Skyline Problem July 1, 2014

[Question] Coin Change Problem June 30, 2014

[Question] Make a fair coin from a biased coin June 30, 2014

[Question] 0-1 Knapsack Problem June 30, 2014

[NineChap 9] Big Date, System Design and Resume (`) June 30, 2014

[LintCode] Majority Number II June 28, 2014

[LintCode] Majority Number III June 28, 2014

[LintCode] Majority Number June 28, 2014

[LintCode] Maximum Subarray II June 28, 2014

[LintCode] Minimum Subarray June 28, 2014

[NineChap 7] Data Structure June 28, 2014

[NineChap 8] High Frequency Questions June 28, 2014

[LintCode] Partition Array June 28, 2014

[Question] Single Number III June 28, 2014

[Question] Single Number IV June 28, 2014

[LintCode] Previous Permutation June 27, 2014

[Question] Topology Sort June 27, 2014

[Brain teaser] Khan Academy 8 brain teasers June 26, 2014

[NineChap 6] Graph and Search June 26, 2014

[LintCode] Longest Common Subsequence June 24, 2014

[LintCode] Longest Increasing Subsequence June 24, 2014

[NineChap 5.1] Dynamic Programming June 24, 2014

[Design] Cache and Page Replacement Algorithms June 23, 2014

[NineChap 4.2] Linked List Additional June 18, 2014

[Question] Number Sum Sequence June 18, 2014

[Brain teaser] 2 Eggs 100 Floors Puzzle June 18, 2014

[LeetCode Plus] Reverse linked list iteratively and recursively June 17, 2014

[Design] Time complexity calculation (Master theorem) June 17, 2014

[Question] Union and Intersection of two Linked Lists June 17, 2014

[LeetCode Plus] Binary Tree Serialize and Deserialize June 16, 2014

[NineChap 4.1] Linked List June 16, 2014

[Question] Binary Search Tree find upper/lower bound June 15, 2014

[Java OOP] Java Global Variable June 15, 2014

[NineChap 3.4] Binary Tree Additional June 15, 2014

[Question] Count negative in a 2D Sorted Matrix June 14, 2014

[Question] Iterator of Binary Search Tree June 14, 2014

[Java OOP] Java modifier and Access Level June 14, 2014

[Question] Search Range in BST (Trim a BST) June 13, 2014

[Question] Compare Mergesort and Quicksort June 12, 2014

[NineChap 1.2] Permutation June 12, 2014

[Design] BST Node Insertion / Deletion June 11, 2014

[NineChap 1.1] strStr and Coding Style June 11, 2014

[Question] First Character Appearing Only Once June 10, 2014

[LeetCode Plus] Lowest Common Ancestor of BST June 10, 2014

[LeetCode Plus] Lowest Common Ancestor of Binary Tree (II) June 10, 2014

[LeetCode Plus] Lowest Common Ancestor of Binary Tree (I) June 10, 2014

[NineChap 3.3] Binary Search Tree June 10, 2014

[NineChap 3.2] Binary Tree BFS June 10, 2014

[NineChap 3.1] Binary Tree DFS and Divide Conquer June 10, 2014

[LeetCode Plus] Searching a 2D Sorted Matrix June 10, 2014

[NineChap 2.2] Sorted Array June 9, 2014

[NineChap 2.1] Binary Search June 8, 2014

[LintCode] Recover Rotated Sorted Array June 8, 2014

[Testing] Software Testing June 5, 2014

[Question] Junit Hand-on Notes June 4, 2014

[Question] ASCII, Utf-8, Utf-16 and Unicode June 4, 2014

[Design] Big Endian and Little Endian June 3, 2014

[LeetCode 145] Binary Tree Postorder Traversal June 3, 2014

[LeetCode 150] Evaluate Reverse Polish Notation June 3, 2014

[Design] Implemention of DFS using a Stack June 3, 2014

[LeetCode 146] LRU Cache June 3, 2014

[LeetCode 149] Max Points on a Line June 3, 2014

[LeetCode 143] Reorder List June 3, 2014

[LeetCode 151] Reverse Words in a String June 3, 2014

[LeetCode 144] Binary Tree Preorder Traversal June 2, 2014

[LeetCode 138] Copy List with Random Pointer June 2, 2014

[LeetCode 142] Linked List Cycle II June 2, 2014

[LeetCode 141] Linked List Cycle June 2, 2014

[LeetCode 148] Sort List June 2, 2014

[LeetCode 140] Word Break II June 2, 2014

[LeetCode 139] Word Break June 2, 2014

[LeetCode 137] Single Number II June 1, 2014

[LeetCode 136] Single Number June 1, 2014

[LeetCode 135] Candy May 31, 2014

[LeetCode 134] Gas Station May 31, 2014

[LeetCode 133] Clone Graph May 30, 2014

[LeetCode 147] Insertion Sort List May 30, 2014

[LeetCode 132] Palindrome Partitioning II May 30, 2014

[LeetCode 126] Word Ladder II (unsolvable) May 30, 2014

[Design] DFS, BFS and space efficiency May 29, 2014

[LeetCode 128] Longest Consecutive Sequence May 29, 2014

[LeetCode 131] Palindrome Partitioning May 29, 2014

[LeetCode 129] Sum Root to Leaf Numbers May 29, 2014

[LeetCode 130] Surrounded Regions May 29, 2014

[LeetCode 127] Word Ladder May 29, 2014

[LeetCode 122] Best Time to Buy and Sell Stock II May 28, 2014

[LeetCode 123] Best Time to Buy and Sell Stock III May 28, 2014

[LeetCode 121] Best Time to Buy and Sell Stock May 28, 2014

[LeetCode 124] Binary Tree Maximum Path Sum May 28, 2014

[LeetCode 114] Flatten Binary Tree to Linked List May 28, 2014

[LeetCode 125] Valid Palindrome May 28, 2014

[LeetCode 106] Construct Binary Tree from Inorder and Postorder May 27, 2014

[LeetCode 105] Construct Binary Tree from Preorder and Inorder May 27, 2014

[LeetCode 115] Distinct Subsequences May 27, 2014

[LeetCode 119] Pascal's Triangle II May 27, 2014

[LeetCode 118] Pascal's Triangle May 27, 2014

[LeetCode 113] Path Sum II May 27, 2014

[LeetCode 112] Path Sum May 27, 2014

[LeetCode 117] Populating Next Right Pointers in Each Node II May 27, 2014

[LeetCode 116] Populating Next Right Pointers in Each Node May 27, 2014

[LeetCode 120] Triangle May 27, 2014

[LeetCode 110] Balanced Binary Tree May 26, 2014

[LeetCode 108] Convert Sorted Array to Binary Search Tree May 26, 2014

[LeetCode 109] Convert Sorted List to Binary Search Tree May 26, 2014

[LeetCode 101] Symmetric Tree May 26, 2014

[LeetCode 95] Unique Binary Search Trees II May 26, 2014

[LeetCode 96] Unique Binary Search Trees May 26, 2014

[LeetCode 98] Validate Binary Search Tree May 26, 2014

[LeetCode 107] Binary Tree Level Order Traversal II May 25, 2014

[LeetCode 102] Binary Tree Level Order Traversal May 25, 2014

[LeetCode 103] Binary Tree Zigzag Level Order Traversal May 25, 2014

[LeetCode 104] Maximum Depth of Binary Tree May 25, 2014

[LeetCode 111] Minimum Depth of Binary Tree May 25, 2014

[LeetCode 99] Recover Binary Search Tree May 25, 2014

[LeetCode 100] Same Tree May 25, 2014

[LeetCode 94] Binary Tree Inorder Traversal May 24, 2014

[LeetCode 97] Interleaving String May 24, 2014

[LeetCode 85] Maximal Rectangle May 24, 2014

[LeetCode 93] Restore IP Addresses May 24, 2014

[LeetCode 91] Decode Ways May 23, 2014

[LeetCode 89] Gray Code May 23, 2014

[LeetCode 84] Largest Rectangle in Histogram May 23, 2014

[LeetCode 88] Merge Sorted Array May 23, 2014

[LeetCode 86] Partition List May 23, 2014

[LeetCode 92] Reverse Linked List II May 23, 2014

[LeetCode 87] Scramble String May 23, 2014

[LeetCode 77] Combinations May 22, 2014

[LeetCode 80] Remove Duplicates from Sorted Array II May 22, 2014

[LeetCode 82] Remove Duplicates from Sorted List II May 22, 2014

[LeetCode 83] Remove Duplicates from Sorted List May 22, 2014

[LeetCode 81] Search in Rotated Sorted Array II May 22, 2014

[LeetCode 90] Subsets II May 22, 2014

[LeetCode 78] Subsets May 22, 2014

[LeetCode 67] Add Binary May 21, 2014

[LeetCode 70] Climbing Stairs May 21, 2014

[LeetCode 72] Edit Distance May 21, 2014

[LeetCode 76] Minimum Window Substring May 21, 2014

[LeetCode 66] Plus One May 21, 2014

[LeetCode 74] Search a 2D Matrix May 21, 2014

[LeetCode 73] Set Matrix Zeroes May 21, 2014

[LeetCode 71] Simplify Path May 21, 2014

[LeetCode 75] Sort Colors May 21, 2014

[LeetCode 69] Sqrt(x) May 21, 2014

[LeetCode 79] Word Search May 21, 2014

[LeetCode 53] Maximum Subarray May 20, 2014

[LeetCode 64] Minimum Path Sum May 20, 2014

[LeetCode 63] Unique Paths II May 20, 2014

[LeetCode 62] Unique Paths May 20, 2014

[LeetCode 60] Permutation Sequence May 19, 2014

[LeetCode 61] Rotate List May 19, 2014

[LeetCode 57] Insert Interval May 18, 2014

[LeetCode 68] Text Justification (unsolvable) May 18, 2014

[LeetCode 65] Valid Number (unsolvable) May 18, 2014

[LeetCode 56] Merge Intervals May 17, 2014

[LeetCode 55] Jump Game May 16, 2014

[LeetCode 58] Length of Last Word May 16, 2014

[LeetCode 52] N-Queens II May 16, 2014

[LeetCode 51] N-Queens May 16, 2014

[LeetCode 59] Spiral Matrix II May 16, 2014

[LeetCode 54] Spiral Matrix May 16, 2014

[LeetCode 49] Anagrams May 15, 2014

[LeetCode 50] Pow(x, n) May 15, 2014

[LeetCode 44] Wildcard Matching May 15, 2014

[LeetCode 41] First Missing Positive May 14, 2014

[LeetCode 45] Jump Game II May 14, 2014

[LeetCode 43] Multiply Strings May 14, 2014

[LeetCode 47] Permutations II May 14, 2014

[LeetCode 46] Permutations May 14, 2014

[LeetCode 48] Rotate Image May 14, 2014

[LeetCode 37] Sudoku Solver May 14, 2014

[LeetCode 42] Trapping Rain Water May 14, 2014

[LeetCode 40] Combination Sum II May 13, 2014

[LeetCode 39] Combination Sum May 13, 2014

[LeetCode 38] Count and Say May 13, 2014

[LeetCode 32] Longest Valid Parentheses May 12, 2014

[LeetCode 31] Next Permutation May 12, 2014

[LeetCode 35] Search Insert Position May 12, 2014

[LeetCode 34] Search for a Range May 12, 2014

[LeetCode 33] Search in Rotated Sorted Array May 12, 2014

[LeetCode 36] Valid Sudoku May 12, 2014

[LeetCode 23] Merge k Sorted Lists May 11, 2014

[LeetCode 25] Reverse Nodes in k-Groups May 11, 2014

[Fundamental] Heap (data structure) May 11, 2014

[LeetCode 29] Divide Two Integers May 10, 2014

[LeetCode 28] Implement strStr May 10, 2014

[Fundamental] Java Bit Operation May 10, 2014

[Fundamental] Recap on Java HashMap May 10, 2014

[LeetCode 30] Substring with Concatenation of All Words May 10, 2014

[LeetCode 22] Generate Parentheses May 9, 2014

[LeetCode 21] Merge Two Sorted Lists May 9, 2014

[LeetCode 26] Remove Duplicates from Sorted Array May 9, 2014

[LeetCode 27] Remove Element May 9, 2014

[LeetCode 24] Swap Nodes in Pairs May 9, 2014

[LeetCode 20] Valid Parentheses May 9, 2014

[LeetCode 18] 4Sum May 3, 2014

[LeetCode 16] 3Sum Closest May 2, 2014

[LeetCode 15] 3Sum May 2, 2014

[LeetCode 17] Letter Combinations of a Phone Number May 2, 2014

[LeetCode 19] Remove Nth Node From End of List May 2, 2014

[LeetCode 14] Longest Common Prefix May 1, 2014

[LeetCode 12] Integer to Roman April 30, 2014

[LeetCode 13] Roman to Integer April 30, 2014

[LeetCode 11] Container With Most Water April 29, 2014

[LeetCode 9] Palindrome Number April 29, 2014

[LeetCode 10] Regular Expression Matching April 29, 2014

[LeetCode 8] String to Integer (atoi) April 29, 2014

[LeetCode 6] ZigZag Conversion April 29, 2014

[LeetCode 5] Longest Palindromic Substring April 28, 2014

[LeetCode 7] Reverse Integer April 28, 2014

[LeetCode 2] Add Two Numbers April 27, 2014

[LeetCode 3] Longest Substring Without Repeating Characters April 27, 2014

[LeetCode 4] Median of Two Sorted Arrays April 26, 2014

[LeetCode 1] Two Sum April 26, 2014

LeetCode Statistics April 25, 2014

[Question] Get Max Number Game (minmax + dp) November 21, 2013

[Question] Insert Plus and Minus to Complete Expression November 21, 2013

[Amazon] Infix to Postfix conversion November 20, 2013

[Question] Count Arithmetic Slices November 15, 2013

[Question] Shuffle and Get Max Difference November 15, 2013

[Question] Number Of Bus Stations (meeting rooms) November 5, 2013