Leetcode

890 - Find And Replace Pattern

34 - Find First And Last Position Of Element In Sorted Array

1047 - Remove All Adjacent Duplicates In String

1209 - Remove All Adjacent Duplicates In String Ii

576 - Out Of Boundary Paths

1472 - Design Browser History

1429 - First Unique Number

346 - Moving Average From Data Stream

876 - Middle Of The Linked List

973 - K Closest Points To Origin

1192 - Critical Connections In A Network

896 - Monotonic Array

689 - Maximum Sum Of 3 Non Overlapping Subarrays

785 - Is Graph Bipartite

824 - Goat Latin

636 - Exclusive Time Of Functions

523 - Continuous Subarray Sum

987 - Vertical Order Traversal Of A Binary Tree

833 - Find And Replace In String

588 - Design In Memory File System

889 - Construct Binary Tree From Preorder And Postorder Traversal

1011 - Capacity To Ship Packages Within D Days

844 - Backspace String Compare

1197 - Minimum Knight Moves

363 - Max Sum Of Rectangle No Larger Than K

951 - Flip Equivalent Binary Trees

1146 - Snapshot Array

489 - Robot Room Cleaner

1219 - Path With Maximum Gold

752 - Open The Lock

743 - Network Delay Time

729 - My Calender I

731 - My Calendar II

939 - Minimum Area Rectangle

846 - Hand Of Straights

1145 - Binary Tree Coloring Game

1074 - Numbers Of Submatrices That Sum To Target

727 - Minimum Window Subsequence

801 - Minimum Swaps To Make Sequence Increasing

552 - Student Attendance Record Ii

1153 - String Transformations Into Another String

659 - Split Array Into Consecutive Subsequences

1055 - Shortest Way To Form String

465 - Optimal Account Balancing

1000 - Minimum Cost To Merge Stones

809 - Expressive Words

1110 - Delete Nodes And Return Forest

1056 - Confusing Number

1088 - Confusing Number II

1170 - Compare Strings By Frequency Of The Smallest Character

1155 - Number Of Dice Rolls With Target Sum

545 - Boundary Of Binary Tree

1152 - Analyze User Website Visit Pattern

1099 - Two Sum Less Than K

866 - Prime_Palindrome

1102 - Path With Maximum Minimum Value

694 - Number Of Distinct Islands

819 - Most Common Word

1167 - Minimum Cost To Connect Sticks

456 - 132 Pattern

787 - Cheapest Flights Within K Stops

1057 - Campus Bikes

679 - 24 Game

721 - Accounts Merge

1031 - Maximum Sum Of Two Non-Overlapping Subarrays

622 - Design Circular Queue

518 - Coin Change 2

426 - Convert Binary Search Tree To Sorted Doubly Linked List

647 - Palindromic Substrings

1249 - Minimum Remove To Make Valid Parentheses

498 - Diagonal Traverse

863 - All Nodes Distance K In Binary Tree

680 - Valid Palindrome II

773 - Sliding Puzzle

767 - Reorganize String

957 - Prison Cells After N Days

755 - Pour Water

716 - Max Stack

695 - Max Area Of Island

739 - Daily Temperatures

525 - Contiguous Array

472 - Concatenated Words

692 - Top K Frequent Words

843 - Guess The Word

438 - Find All Anagrams In A String

772 - Basic Calculator III

443 - String Compression

528 - Random Pick With Weight

986 - Interval List Intersections

445 - Add Two Numbers II

415 - Add Strings

228 - Summary Ranges

236 - Lowest Common Ancestor of a Binary Tree

339 - Nested List Weight Sum

364 - Nested List Weight Sum II

348 - Design Tic Tac Toe

44 - Wildcard Matching

72 - Edit Distance

239 - Sliding Window Maximum

412 - Fizz Buzz

140 - Word Break II

811 - Subdomain Visit Count

780 - Reaching Points

362 - Design Hit Counter

341 - Flatten Nested List Iterator

227 - Basic Calculator II

45 - Jump Game II

1048 - Longest String Chain

430 - Flatten A Multilevel Doubly Linked List

621 - Task Scheduler

759 - Employee Free Time

460 - Lfu Cache

547 - Friend Circles

1181 - Before And After Puzzle

735 - Asteroid Collision

981 - Time Based Key Value Store

642 - Design Search Autocomplete System

336 - Palindrome Pairs

539 - Minimum Time Difference

609 - Find Duplicate File In System

953 - Verifying An Alien Dictionary

560 - Subarray Sum Equals K

1007 - Minmum Domino Rotations For Equal Row

347 - Top K Frequent Elements

1268 - Search Suggestions System

994 - Rotting Oranges

937 - Reorder Data in Log Files

766 - Toeplitz Matrix

734 - Sentence Similarity

737 - Sentence Similarity II

418 - Sentence Screen Fitting

686 - Repeated String Match

406 - Queue Reconstruction By Height

417 - Pacific Atlantic Water Flow

681 - Next Closest Time

524 - Longest Word In Dictionary Through Deleting

687 - Longest Univalue Path

482 - License Key Formatting

616 - Add Bold Tag In String

354 - Russian Doll Envelopes

370 - Range Addition

369 - Plus One Linked List

359 - Logger Rate Limiter

356 - Line Reflection

353 - Design Snake Game

351 - Android Unlock Patterns

503 - Next Greater Element II

487 - Max Consecutive Ones II

384 - Shuffle An Array

396 - Rotate Function

398 - Random Pick Index

400 - Nth Digit

395 - Longest Substring With At Least K Repeating Characters

382 - Linked List Random Node

397 - Integer Replacement

380 - Insert Delete Getrandom O1

381 - Insert Delete Getrandom O1 Duplicates Allowed

399 - Evaluate Division

393 - UTF-8 Validation

388 - Longest Absolute File Path

392 - Is Subsequence

387 - First Unique Character In A String

390 - Elimination Game

394 - Decode String

376 - Wiggle Subsequence

365 - Water And Jug Problem

367 - Valid Perfect Square

347 - Top K Frequent Elements

372 - Super Pow

371 - Sum Of Two Integers

383 - Ransom Note

385 - Mini Parser

386 - Lexicographical Numbers

374 - Guess Number Higher Or Lower

373 - Find K Pairs With Smallest Sums

357 - Count Numbers With Unique Digits

377 - Combination Sum Iv

297 - Serialize And Deserialize Binary Tree

345 - Reverse Vowels Of A String

342 - Power Of Four

337 - House Robber III

349 - Intersection Of Two Arrays

350 - Intersection Of Two Arrays II

343 - Integer Break

410 - Split Array Largest Sum

416 - Partition Equal Subset Sum

421 - Maximum Xor Of Two Numbers In An Array

242 - Valid Anagram

217 - Contains Duplicate

191 - Number Of 1 Bits

167 - Two Sum II

189 - Rotate Array

368 - Largest Divisible Subset

Matchsticks To Square

Increasing Subsequences

Beautiful Arrangement

Kill Process

375 - Guess Number Higher Or Lower II

1 - Two Sum

575 - Distribute Candies

Find The Difference

Longest Uncommon Subsequence ii

Longest Uncommon Subsequence i

448 - Find All Numbers Disappeared in an Array

355 - Design Twitter

485 - Max Consecutive Ones

Detect Capital

463 - Island Perimeter

Reverse String

496 - Next Greater Element I

Reshape the Matrix

476 - Number Complement

Keyboard Row

Reverse Words in a String III

461 - Hamming Distance

561 - Array Partition 1

507 - Perfect number

501 - Find Mode in Binary Search Tree

333 - Largest BST Subtree

331 - Verify Preorder Serialization of a Binary Tree

334 - Increasing Triplet Subsequence

332 - Reconstruct Itinerary

330 - Patching Array

Longest Increasing Path in a Matrix

Top k elements with most occurrences

328 - Odd Even Linked List

327 - Count of Range Sum

326 - Power of Three

325 - Maximum Size Subarray Sum Equals k

Wiggle Sort II

323 - Number of Connected Components in an Undirected Graph

322 - Coin Change

321 - Create Maximum Number

320 - Generalized Abbreviation

Java interview questions

319 - Bulb Switcher

317 - Shortest Distance from All Buildings

318 - Maximum Product of Word Lengths

Reverse half of a Linkedlist

Remove Duplicate Letters

System design readings

315 - Count of Smaller Numbers After Self

314 - Binary Tree Vertical Order Traversal

313 - Super Ugly Number

312 - Burst Balloons

Sparse Matrix Multiplication

290 - Word Pattern

310 - Minimum Height Trees

Asynchronous vs synchronous execution

309 - Best Time to Buy and Sell Stock with Cooldown

308 - Range Sum Query 2D - Mutable

340 - Longest Substring with At Most K Distinct Characters

307 - Range Sum Query - Mutable

306 - Additive Number

Quick Sort

9 - Palindrome Number

6 - ZigZag Conversion

14 - Longest Common Prefix

22 - Generate Parentheses

30 - Substring with Concatenation of All Words

32 - Longest Valid Parentheses

37 - Sudoku Solver

43 - Multiply Strings

59 - Spiral Matrix II

54 - Spiral Matrix

Swap two digits in a integer

68 - Text Justification

85 - Maximal Rectangle

91 - Decode Ways

93 - Restore IP Addresses

304 - Range Sum Query 2D - Immutable

99 - Recover Binary Search Tree

100 - Same Tree

101 - Symmetric Tree

113 - Path Sum II

303 - Range Sum Query - Immutable

117 - Populating Next Right Pointers in Each Node II

116 - Populating Next Right Pointers in Each Node

119 - Pascal's Triangle II

118 - Pascal's Triangle

50 - Pow(x, n)

What is the difference between a thread and a process?

Smallest Rectangle Enclosing Black Pixels

130 - Surrounded Regions

112 - Path Sum

129 - Sum Root to Leaf Numbers

132 - Palindrome Partitioning II

Difference between a stack and a heap

158 - Read N Characters Given Read4 II - Call multiple times

157 - Read N Characters Given Read4

156 - Binary Tree Upside Down

159 - Longest Substring with At Most Two Distinct Characters

One Edit Distance

163 - Missing Ranges

165 - Compare Version Numbers

166 - Fraction to Recurring Decimal

Two Sum III - Data structure design

171 - Excel Sheet Column Number

168 - Excel Sheet Column Title

301 - Remove Invalid Parentheses

Dungeon Game

187 - Repeated DNA Sequences

190 - Reverse Bits

199 - Binary Tree Right Side View

201 - Bitwise AND of Numbers Range

202 - Happy Number

204 - Count Primes

Isomorphic Strings

210 - Course Schedule II

207 - Course Schedule

211 - Add and Search Word

213 - House Robber II

214 - Shortest Palindrome

216 - Combination Sum III

220 - Contains Duplicate III

219 - Contains Duplicate II

221 - Maximal Square

222 - Count Complete Tree Nodes

225 - Implement Stack using Queues

224 - Basic Calculator

海量数据处理

230 - Kth Smallest Element in a BST

241 - Different Ways to Add Parentheses

Shortest Word Distance III

Shortest Word Distance II

Shortest Word Distance

Strobogrammatic Number III

Strobogrammatic Number II

246 - Strobogrammatic Number

249 - Group Shifted Strings

250 - Count Univalue Subtrees

Flatten 2D Vector

253 - Meeting Rooms II

252 - Meeting Rooms

Factor Combinations

299 - Bulls and Cows

255 - Verify Preorder Sequence in Binary Search Tree

256 - Paint House

257 - Binary Tree Paths

258 - Add Digits

259 - 3Sum Smaller

261 - Graph Valid Tree

264 - Ugly Number II

Paint House II

267 - Palindrome Permutation II

266 - Palindrome Permutation

269 - Alien Dictionary

270 - Closest Binary Search Tree Value

271 - Encode and Decode Strings

272 - Closest Binary Search Tree Value II

273 - Integer to English Words

275 - H-Index II

274 - H-Index

276 - Paint Fence

277 - Find the Celebrity

280 - Wiggle Sort

281 - Zigzag Iterator

Inorder Successor in BST

Walls and Gates

288 - Unique Word Abbreviation

Flip Game II

293 - Flip Game

Best Meeting Point

298 - Binary Tree Longest Consecutive Sequence

295 Find Median from Data Stream

292 - Nim Game

289 - Game of Life

287 - Find the Duplicate Number

284 - Peeking Iterator

283 - Move Zeroes

282 - Expression Add Operators

279 - Perfect Squares

146 - LRU Cache

Search in a Big Sorted Array

Coins in a Line III

135 - Candy

Data Stream Median

Expression Evaluation

84 - Largest Rectangle in Histogram

Max Tree

10 - Regular Expression Matching

65 - Valid Number

Scramble String

Post Office Problem

Bucket sort

Maximum gap

223 - Rectangle Area

Largest sibling

547 - Friend circles

Summary for leetcode, zz from peking2

Copy Books

Expression Tree Build

Triangle Count

Buy one get one free

Counting heads

Local maximum

Binary Representation

Word Pattern II

Building skyline Outline

218 - The Skyline Problem

Sliding Window Median

160 - Intersection of Two Linked Lists

234 - Palindrome Linked List

24 - Swap Nodes in Pairs

203 - Remove Linked List Elements

114 - Flatten Binary Tree to Linked List

17 - Letter Combinations of a Phone Number

25 - Reverse Nodes in k-Group

Find the Weak Connected Component in the Directed Graph

Trapping Rain Water II

42 - Trapping Rain Water

212 - Word Search II

79 - Word Search

The Smallest Difference

Sort Letters by Case

Sort Colors II

75 - Sort Colors

71 - Simplify Path

73 - Set Matrix Zeroes

61 - Rotate List

48 - Rotate Image

Rehashing

Number of Airplanes in the Sky

31 - Next Permutation

Minimum Adjustment Cost

209 - Minimum Size Subarray Sum

Maximum Subarray Difference

152 - Maximum Product Subarray

149 - Max Points on a Line

3 - Longest Substring Without Repeating Characters

128 - Longest Consecutive Sequence

179 - Largest Number

378 - Kth Smallest Element in a Sorted Matrix

k Sum II

k Sum

208 - Implement Trie

Interleaving Positive and Negative Numbers

13 - Roman to Integer

12 - Integer to Roman

198 - House Robber

134 - Gas Station

Convert Expression to Polish Notation

Convert Expression to Reverse Polish Notation

150 - Evaluate Reverse Polish Notation

29 - Divide Two Integers

Digit Counts

Delete Digits

248 - Count of Smaller Number

Segment Tree Modify

Segment Tree Query II

Segment Tree Query

Segmemt Tree Build II

Segment Tree Build

11 - Container With Most Water

Coins in a Line II

Coins in a Line

133 - Clone Graph

52 - N-Queens II

51 - N-Queens

8 - String to Integer(atoi)

Nuts & Bolts Problem

89 - Gray Code

76 - Minimum Window Substring

Matrix Zigzag Traversal

56 - Merge Intervals

57 - Insert Interval

268 - Find the Missing Number

36 - Valid Sudoku

Heapify

155 - Min Stack

232 - Implement Queue Using Stacks

Longest Words

126 - Word Ladder II

127 - Word Ladder

Topological Sorting

Route Between Two Nodes in Graph

Find the Connected Component in the Undirected Graph

Longest Increasing Continuous subsequence II

300 - Longest Increasing Subsequence

Maximum Subarray III

Maximum Subarray II

53 - Maximum Subarray

97 - Interleaving String

Distinct Subsequences

Best Time to Buy and Sell Stock IV

123 - Best Time to Buy and Sell Stock III

122 - Best Time to Buy and Sell Stock II

121 - Best Time to Buy and Sell Stock

Longest Common Subsequence

139 - Word Break

55 - Jump Game

70 - Climbing Stairs

63 - Unique Paths II

62 - Unique Paths

64 - Minimum Path Sum

120 - Triangle

60 - Permutation Sequence

40 - Combination Sum II

39 - Combination Sum

77 - Combinations

95 - Unique Binary Search Trees II

47 - Permutations II

46 - Permutations

90 - Subsets II

78 - Subsets

20 - Valid parentheses

Unique Characters

7 - Reverse Integer

131 - Palindrome Partitioning

305 - Number of Islands II

200 - Number of Islands

Nth to Last Node in List

111 - Minimum Depth of Binary Tree

Cosine Similarity

173 - Binary Search Tree Iterator

109 - Convert Sorted List to Binary Search Tree

108 - Convert Sorted Array to Binary Search Tree

98 - Validate Binary Search Tree

103 - Binary Tree Zigzag Level Order Traversal

106 - Construct Binary Tree from Inorder and Postorder Traversal

105 - Construct Binary Tree from Preorder and Inorder Traversal

543 - Diameter of a Binary Tree

226 - Invert Binary Tree

124 - Binary Tree Maximum Path Sum

110 - Balanced Binary Tree

104 - Maximum Depth of Binary Tree

107 - Binary Tree Level Order Traversal II

102 - Binary Tree Level Order Traversal

145 - Binary Tree Postorder Traversal

94 - Binary Tree Inorder Traversal

144 - Binary Tree Preorder Traversal

138 - Copy List with Random Pointer

148 - Sort List

147 - Insertion Sort List

234 - Palindrome Linked List

143 - Reorder List

23 - Merge k Sorted Lists

21 - Merge Two Sorted Lists

92 - Reverse Linked List II

206 - Reverse Linked List

142 - Linked List Cycle II

141 - Linked List Cycle

19 - Remove Nth Node From End of List

Two Lists Sum

86 - Partition List

Remove Duplicates from Unsorted List

82 - Remove Duplicates from Sorted List II

83 - Remove Duplicates from Sorted List

66 - Plus One

263 - Ugly Number

Majority Number III

229 - Majority Element II

169 - Majority Number

Print Numbers by Recursion

Fibonacci

Hash Function

Fast Power

96 - Unique Binary Search Trees

172 - Factorial Trailing Zeroes

231 - Power of Two

260 - Single Number III

137 - Single Number II

136 - Single Number

Wood Cut

69 - Sqrt(x)

4 - Median of Two Sorted Arrays

240 - Search a 2D Matrix II

154 - Find Minimum in Rotated Sorted Array II

153 - Find Minimum in Rotated Sorted Array

81 - Search in Rotated Sorted Array II

33 - Search in Rotated Sorted Array

162 - Find Peak Element

278 - First Bad Version

34 - Search for a Range

35 - Search Insert Position

Binary Search

215 - Kth Largest Element in an Array

Partition Array by Odd and Even

Median of unsorted array

Merge Sorted Array II

88 - Merge Sorted Array

80 - Remove Duplicates from Sorted Array II

26 - Remove Duplicates from Sorted Array

16 - 3Sum Closest

18 - 4Sum

15 - 3Sum

41 - First Missing Positive

238 - Product of Array Exclude Itself

Recover Rotated Sorted Array

Subarray Sum K

27 - Remove Element

38 - Count and Say

58 - Length of Last Word

Space Replacement

5 - Longest Palindromic Substring

125 - Valid Palindrome

151 - Reverse Words in a String

Rotate String

Longest Common Substring

49 - Group Anagrams

Compare Strings

Two Strings Are Anagrams

28 - Implement strStr()

Find sum

Sort array

237 - Delete Node in the Middle of Singly Linked List

450 - Delete Node in a BST

2 - Add Two Numbers

67 - Add Binary

Lintcode

572 - Subtree of Another Tree

378 - Convert Binary Search Tree to Doubly Linked List

207 - Interval Sum II

249 - Count of Smaller Number before itself

206 - Interval Sum

205 - Interval Minimum Number

397 - Longest Increasing Continuous subsequence

44 - Minimum Subarray

Backpack II

Backpack

Singleton

11 - Search Range in Binary Search Tree

1 - A + B Problem

365 - Count 1 in Binary

179 - Update Bits

31 - Partition Array

139 - Subarray Sum Closest

139 - Subarray Sum II

138 - Subarray Sum

181 - Flip Bits

Amazon

74 - Search a 2D Matrix

Facebook

74 - Search a 2D Matrix

OS

Top 50 Operating System Interview Questions

OA

Update Tree

Find the difference between two set

360 - Sort Transformed Array

Pick a random number from a BST

OA - Randomly Choose k Samples

Find best container

OA - Flattening a Linked List

OA - Max multiplication

OA - String matching

Python

Beautiful Soup Cheat Sheet

Build crawler using scrapy

Python notes

Deep Learning

Deep Learning Notes

Docker

Docker cheat sheet

Html

Add google analytics to your website

HTML Tags

Binary Search

1231 - Divide Chocolate

Greedy

1231 - Divide Chocolate