welcome
LeetCode
Introduction
Design
348. Design Tic-Tac-Toe
534. Design TinyURL
535. Encode and Decode TinyURL
346. Moving Average from Data Stream
281. Zigzag Iterator
381. Insert Delete GetRandom O(1) - Duplicates allowed
432. All O`one Data Structure
341. Flatten Nested List Iterator
642. Design Search Autocomplete System
170. Two Sum III - Data structure design
622. Design Circular Queue
295. Find Median from Data Stream
OOD
146.LRU Cache(Amazon)
Sort
Bucket Sort
791. Custom Sort String
347. Top K Frequent Elements
1057. Campus bikes
280. Wiggle Sort
75. Sort Colors
Binary Search
278. First Bad Version
162. Find Peak Element in O(logn)
LintCode 183. Wood Cut
33. Search in Rotated Sorted Array
81. Search in Rotated Sorted Array II
153. Find Minimum in Rotated Sorted Array
154. Find Minimum in Rotated Sorted Array II
34. Find First and Last Position of Element in Sorted Array
Count number of occurrences (or frequency) in a sorted array
378. Kth Smallest Element in a Sorted Matrix
240. Search a 2D Matrix II
658. Find K Closest Elements
410. Split Array Largest Sum
Data Structure
Arrays
Two Pointer
11. Container With Most Water
283. Move Zeros
26. Remove Duplicates from Sorted Array
88. Merge Sorted Array
683. K Empty Slots
4. Median of Two Sorted Arrays
Interval
56. Merge Interval
57. Insert Interval
54. Spiral Matrix
48. Rotate Image(Amazon, MicroSoft, Apple)
448. Find All Numbers Disappeared in an Array
228. Summary Ranges
289. Game of Life
298. Product of Array Except Self
825. Friends of Appropriate Ages
Stack
Postfix to Infix
155. Min Stack
716. Max Stack
388. Longest Absolute File Path
316. Remove Duplicate Letters
636. Exclusive Time of Functions
Calculator Series
227. Basic Calculator
772. Basic Calculator III
Trie
208. Implement Trie (Prefix Tree)
211. Add and Search Word - Data structure design
336. Palindrome Pairs
212. Word Search II
Heap
218. The Skyline Problem
23. Merge k Sorted Lists
252. Meeting Rooms
253. Meeting Rooms II
215. Kth Largest Element in an Array
692. Top K Frequent Words
373. Find K Pairs with Smallest Sums
Deque
239. Sliding Window Maximum
Map
128. Longest Consecutive Sequence
350. Intersection of Two Arrays II
760. Find Anagram Mappings
Segment Tree / Binary Indexed Tree
308. Range Sum Query 2D - Mutable
218. The Skyline Problem
315. Count of Smaller Numbers After Self
308. Range Sum Query 2D - Mutable
493. Reverse Pairs
Linked List
19. Remove Nth Node From End of List
24. Swap Nodes in Pairs
160. Intersection of Two Linked Lists
138. Copy List with Random Pointer
143. Reorder List
445. Add Two Numbers II
Tree
BST
109. Convert Sorted List to Binary Search Tree
285. Inorder Successor in BST
Convert Binary Search Tree (BST) to Sorted Doubly-Linked List
Construct Binary Tree from Inorder and Postorder Traversal
101. Symmetric Tree
105. Construct Binary Tree from Preorder and Inorder Traversal
106. Construct Binary Tree from Inorder and Postorder Traversal
110. Balanced Binary Tree
129. Sum Root to Leaf Numbers
199. Binary Tree Right Side View
257. Binary Tree Paths
543. Diameter of Binary Tree
Sum Root to Leaf Numbers
Hash Table
325. Maximum Size Subarray Sum Equals k
314. Binary Tree Vertical Order Traversal
Union-Find
721. Accounts Merge
305. Number of Islands II
323. Number of Connected Components in an Undirected Graph
261. Graph Valid Tree
947. Most Stones Removed with Same Row or Column
Linked List
138. Copy List with Random Pointer
21. Merge Two Sorted Lists
23. Merge K Sorted Lists
206. Reverse Linked List
237. Delete Node in a Linked List
141. Linked List Cycle
142. Linked List Cycle II
148. Sort List
708. Insert into a Cyclic Sorted List
Graph
BFS/DFS
Topological Sort
207. Course Schedule
210. Course Schedule II
133. Clone Graph
675. Cut Off Trees for Golf Event
269. Alien Dictionary
BackTracking
39. Combination Sum
40. Combination Sum II
79. Word Search
212. Word Search II
282. Expression Add Operators
Memoization
329. Longest Increasing Path in a Matrix
733. Flood Fill
279. Perfect Squares
200. Number of Islands (Amazon)
694. Number of Distinct Islands
711. Number of Distinct Islands II
98. Validate Binary Search Tree
785. Is Graph Bipartite?
491. Increasing Subsequences
51. N-Queens
52. N-Queens II
286. Walls and Gates
111. Minimum Depth of Binary Tree
753. Craking the Safe
399. Evaluate Division
127. Word Ladder
126. Word Ladder II
339. Nested List Weight Sum
Traversal
297. Serialize and Deserialize Binary Tree
236. Lowest Common Ancestor of a Binary Tree
235. Lowest Common Ancestor of a Binary Search Tree
144. Binary Tree Preorder Traversal
255. Verify Preorder Sequence in Binary Search Tree
94. Binary Tree Inorder Traversal
145. Binary Tree Post Order Traversal
102. Level Order Traversal
103. Binary Tree Zipzag Level Order Traversal
107. Binary Tree Level Order Traversal
156. Binary Upside Down
173. Binary Search Tree Iterator
99. Recover Binary Search Tree
Morris Traversal
498. Diagonal Traverse
Flatten
Flatten Binary Tree to Linked List
Math
Bit Manipulation
231. Power of Two
393. UTF-8 Validation
371. Sum of Two Integers
463. Island Perimeter
50. Pow(x,n)
326. Power of Three
67. Add Binary
29. Divide Two Integers
360. Sort Transformed Array
247. Strobogrammatic Number II
277. Find the Celebrity
246. Strobogrammatic Number
415. Add Strings
398. Reservoir Sampling
43. Multiply Strings
311. Sparse Matrix Multiplication
8. String to Integer (Atoi)
7. Reverse Integer
829. Consecutive Numbers Sum
MiniMax
Guess the Word
Sum
1. Two Sum
167. Two Sum II - Input array is sorted
15. 3Sum
16. 3Sum Closest
18. 4Sum
454. 4Sum II
Path sum
124. Binary Tree Maximum Path Sum
113. Path Sum II
437. Path Sum III
209. Minimum Size Subarray Sum
862. Shortest Subarray with Sum at Least K
560. Subarray Sum Equals K
523. Continuous Subarray Sum
Parentheses
20. Valid Parentheses
32. Longest Valid Parentheses
301. Remvoe Invalid Parenthesis
678. Valid Parenthesis String
String
Substring Search
3. Longest Substring Without Repeating Characters
438. Find All Anagrams in a String
76. Minimum Window Substring
30. Substring with Concatenation of All Words
159. Longest Substring with At Most Two Distinct Characters
340. Longest Substring with At Most K Distinct Characters
395. Longest Substring with At Least K Repeating Characters
12. Integer to Roman
13. Roman to Integer
44. Wildcard Matching
242. Valid Anagram
49. Group Anagrams
657. Judge Route Circle
482. License Key Formatting
681. Next Closet Time
387. First Unique Character in a String
426. Convert Binary Search Tree to Sorted Doubly Linked List
273. Integer to English Words
157. Read N Characters Given Read4
158. Read N Characters Given Read4 II - Call multiple times
480. Valid Word Abbreviation
409. Longest Palindrome
680. Valid Palindrome II
125. Valid Palindrome
468. Validate IP Address
161. One Edit Distance
38. Count and Say
Greedy
630. Course Schedule III
621. Task Scheduler
358. Rearrange String k Distance Apart
406. Queue Reconstruction by Height
316. Remove Duplicate Letters
767. Reorganize String
Dynamic Programming
Palindromic Substring
5. longest Palindromic Substring
Subarray
53. Maximum Subarray
152. Maximum Product Subarray
Backpack problem
Backpack I
Backpack II
Backpack III
Backpack IV
Backpack V
Backpack VI aka: Combination Sum IV
Coin Change 2
70. Climbing Stairs
10. Regular Expression Matching
91. Decode Ways
338. Counting Bits
121. Best Time to Buy and Sell Stock
122. Best Time to Buy and Sell Stock II
123. Best Time to Buy and Sell Stock III
139. Word Break
140. Word Break II
198. House Robber
72. Edit Distance
221. Maximal Square
84. Largest Rectangle in Histogram
312. Burst Balloons
304. Range Sum Query 2D - Immutable
518. Coin Change 2
Longest Arithmetic Progression
975. Odd Even Jump
JingChi.ai
Word Composition
Sliding Window Median
537. Erect the Fence (Convex Hull Problem)
LintCode 558: Sliding Window Matrix Maximum
orienteering game
扫雷
Twitter
Identifying Triangle
Last and Second-Last
300. Longest increasing subsequence
Twin String
647. Number of palindromic substring
Wildcard Matching
Akuna
C++ Intern
V1
V2
Cut the Sticks
Quant Dev
Postfix_to_infix
Drone Delivery
phone
LintCode Contest
Ask For Cooling Time
SQL
176. Second Highest Salary
597. Friend Requests I: Overall Acceptance Rate
FB 19
Convert Binary Search Tree (BST) to Sorted Doubly-Linked List
3Sum
Minimum Window Substring
Count number of occurrences (or frequency) in a sorted array
Count NO2
Valid Palindrome
Merge k Sorted Lists
Kth Largest Element in an Array
Move Zeros
Remove Invalid Parenthesis
friends
Integer to English
Islands
Valid Palindrome
sec
Longest Increasing Path in a Matrix
Product of Array Except Self
Binary Tree Vertical Order Traversal
Add Binary
Valid Parentheses
sup
128. Longest Consecutive Sequence
Combination Sum II
Add and Search Word - Data structure design
feb
Google 20
410. Split Array Largest Sum
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