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003. Longest Substring Without Repeating Characters
 
 
004. Median of Two Sorted Arrays
 
 
005. Longest Palindromic Substring
 
 
006. ZigZag Conversion
 
 
007. Reverse Integer
 
 
008. String to Integer (atoi)
 
 
009. Palindrome Number
 
 
010. Regular Expression Matching
 
 
011. Container With Most Water
 
 
012. Integer to Roman
 
 
013. Roman to Integer
 
 
014. Longest Common Prefix
 
 
015. 3Sum
 
 
016. 3Sum Closest
 
 
017. Letter Combinations of a Phone Number
 
 
019. Remove Nth Node From End of List
 
 
020. Valid Parentheses
 
 
021. Merge Two Sorted Lists
 
 
022. Generate Parentheses
 
 
023. Merge k Sorted Lists
 
 
024. Swap Nodes in Pairs
 
 
025. Reverse Nodes in k-Group
 
 
026. Remove Duplicates from Sorted Array
 
 
027. Remove Element
 
 
028. Implement strStr()
 
 
031. Next Permutation
 
 
032. Longest Valid Parentheses
 
 
033. Search in Rotated Sorted Array
 
 
034. Find First and Last Position of Element in Sorted Array
 
 
035. Search Insert Position
 
 
036. Valid Sudoku
 
 
038. Count and Say
 
 
039. Combination Sum
 
 
040. Combination Sum II
 
 
041. First Missing Positive
 
 
042. Trapping Rain Water
 
 
043. Multiply Strings
 
 
044. Wildcard Matching
 
 
045. Jump Game II
 
 
046. Permutations
 
 
047. Permutations II
 
 
048. Rotate Image
 
 
049. Group Anagrams
 
 
050. Pow(x, n)
 
 
053. Maximum Subarray
 
 
054. Spiral Matrix
 
 
055. Jump Game
 
 
056. Merge Intervals
 
 
058. Length of Last Word
 
 
059. Spiral Matrix II
 
 
061. Rotate List
 
 
062. Unique Paths
 
 
063. Unique Paths II
 
 
064. Minimum Path Sum
 
 
066. Plus One
 
 
067. Add Binary
 
 
070. Climbing Stairs
 
 
071. Simplify Path
 
 
072. Edit Distance
 
 
073. Set Matrix Zeroes
 
 
074. Search a 2D Matrix
 
 
075. Sort Colors
 
 
076. Minimum Window Substring
 
 
077. Combinations
 
 
078. Subsets
 
 
079. Word Search
 
 
080. Remove Duplicates from Sorted Array II
 
 
081. Search in Rotated Sorted Array II
 
 
082. Remove Duplicates from Sorted List II
 
 
083. Remove Duplicates from Sorted List
 
 
084. Largest Rectangle in Histogram
 
 
086. Partition List
 
 
088. Merge Sorted Array
 
 
089. Gray Code
 
 
090. Subsets II
 
 
091. Decode Ways
 
 
092. Reverse Linked List II
 
 
093. Restore IP Addresses
 
 
094. Binary Tree Inorder Traversal
 
 
095. Unique Binary Search Trees II
 
 
096. Unique Binary Search Trees
 
 
097. Interleaving String
 
 
098. Validate Binary Search Tree
 
 
1. Two Sum
 
 
100. Same Tree
 
 
101. Symmetric Tree
 
 
102. Binary Tree Level Order Traversal
 
 
103. Binary Tree Zigzag Level Order Traversal
 
 
104. Maximum Depth of Binary Tree
 
 
105. Construct Binary Tree from Preorder and Inorder Traversal
 
 
106. Construct Binary Tree from Inorder and Postorder Traversal
 
 
107. Binary Tree Level Order Traversal II
 
 
108. Convert Sorted Array to Binary Search Tree
 
 
109. Convert Sorted List to Binary Search Tree
 
 
110. Balanced Binary Tree
 
 
111. Minimum Depth of Binary Tree
 
 
112. Path Sum
 
 
113. Path Sum II
 
 
114. Flatten Binary Tree to Linked List
 
 
115. Distinct Subsequences
 
 
116. Populating Next Right Pointers in Each Node
 
 
117. Populating Next Right Pointers in Each Node II
 
 
118. Pascal's Triangle
 
 
119. Pascal's Triangle II
 
 
1192. Critical Connections in a Network
 
 
120. Triangle
 
 
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
 
 
124. Binary Tree Maximum Path Sum
 
 
125. Valid Palindrome
 
 
127. Word Ladder
 
 
128. Longest Consecutive Sequence
 
 
129. Sum Root to Leaf Numbers
 
 
130. Surrounded Regions
 
 
133. Clone Graph
 
 
134. Gas Station
 
 
136. Single Number
 
 
138. Copy List with Random Pointer
 
 
139. Word Break
 
 
140. Word Break II
 
 
141. Linked List Cycle
 
 
142. Linked List Cycle II
 
 
144. Binary Tree Preorder Traversal
 
 
145. Binary Tree Postorder Traversal
 
 
146. LRU Cache
 
 
147. Insertion Sort List
 
 
148. Sort List
 
 
150. Evaluate Reverse Polish Notation
 
 
151. Reverse Words in a String
 
 
152. Maximum Product Subarray
 
 
153. Find Minimum in Rotated Sorted Array
 
 
154. Find Minimum in Rotated Sorted Array II
 
 
155. Min Stack
 
 
159. Longest Substring with At Most Two Distinct Characters
 
 
160. Intersection of Two Linked Lists
 
 
162. Find Peak Element
 
 
165. Compare Version Numbers
 
 
167. Two Sum II - Input array is sorted
 
 
168. Excel Sheet Column Title
 
 
169. Majority Element
 
 
171. Excel Sheet Column Number
 
 
172. Factorial Trailing Zeroes
 
 
173. Binary Search Tree Iterator
 
 
174. Dungeon Game
 
 
187. Repeated DNA Sequences
 
 
188. Best Time to Buy and Sell Stock IV
 
 
189. Rotate Array
 
 
190. Reverse Bits
 
 
191. Number of 1 Bits
 
 
198. House Robber
 
 
199. Binary Tree Right Side View
 
 
2. Add Two Numbers
 
 
200. Number of Islands
 
 
202. Happy Number
 
 
203. Remove Linked List Elements
 
 
204. Count Primes
 
 
205. Isomorphic Strings
 
 
206. Reverse Linked List
 
 
207. Course Schedule
 
 
208. Implement Trie (Prefix Tree)
 
 
209. Minimum Size Subarray Sum
 
 
210. Course Schedule II
 
 
211. Add and Search Word - Data structure design
 
 
212. Word Search II
 
 
213. House Robber II
 
 
215. Kth Largest Element in an Array
 
 
216. Combination Sum III
 
 
217. Contains Duplicate
 
 
219. Contains Duplicate II
 
 
221. Maximal Square
 
 
222. Count Complete Tree Nodes
 
 
223. Rectangle Area
 
 
224. Basic Calculator
 
 
226. Invert Binary Tree
 
 
227. Basic Calculator II
 
 
228. Summary Ranges
 
 
229. Majority Element II
 
 
230. Kth Smallest Element in a BST
 
 
232. Implement Queue using Stacks
 
 
233. Number of Digit One
 
 
234. Palindrome Linked List
 
 
235. Lowest Common Ancestor of a Binary Search Tree
 
 
236. Lowest Common Ancestor of a Binary Tree
 
 
237. Delete Node in a Linked List
 
 
238. Product of Array Except Self
 
 
239. Sliding Window Maximum
 
 
240. Search a 2D Matrix II
 
 
241. Different Ways to Add Parentheses
 
 
242. Valid Anagram
 
 
243. Shortest Word Distance
 
 
250. Count Univalue Subtrees
 
 
252. Meeting Rooms
 
 
253. Meeting Rooms II
 
 
257. Binary Tree Paths
 
 
258. Add Digits
 
 
259. 3Sum Smaller
 
 
263. Ugly Number
 
 
264. Ugly Number II
 
 
266. Palindrome Permutation
 
 
268. Missing Number
 
 
269. Alien Dictionary
 
 
270. Closest Binary Search Tree Value
 
 
273. Integer to English Words
 
 
275. H-Index II
 
 
277. Find the Celebrity
 
 
278. First Bad Version
 
 
279. Perfect Squares
 
 
280. Wiggle Sort
 
 
283. Move Zeroes
 
 
284. Peeking Iterator
 
 
285. Inorder Successor in BST
 
 
286. Walls and Gates
 
 
287. Find the Duplicate Number
 
 
289. Game of Life
 
 
290. Word Pattern
 
 
292. Nim Game
 
 
295. Find Median from Data Stream
 
 
297. Serialize and Deserialize Binary Tree
 
 
299. Bulls and Cows
 
 
300. Longest Increasing Subsequence
 
 
301. Remove Invalid Parentheses
 
 
303. Range Sum Query - Immutable
 
 
304. Range Sum Query 2D - Immutable
 
 
305. Number of Islands II
 
 
309. Best Time to Buy and Sell Stock with Cooldown
 
 
310. Minimum Height Trees
 
 
312. Burst Balloons
 
 
314. Binary Tree Vertical Order Traversal
 
 
315. Count of Smaller Numbers After Self
 
 
317. Shortest Distance from All Buildings
 
 
322. Coin Change
 
 
323. Number of Connected Components in an Undirected Graph
 
 
325. Maximum Size Subarray Sum Equals k
 
 
328. Odd Even Linked List
 
 
329. Longest Increasing Path in a Matrix
 
 
332. Reconstruct Itinerary
 
 
337. House Robber III
 
 
339. Nested List Weight Sum
 
 
341. Flatten Nested List Iterator
 
 
343. Integer Break
 
 
344. Reverse String
 
 
345. Reverse Vowels of a String
 
 
346. Moving Average from Data Stream
 
 
347. Top K Frequent Elements
 
 
348. Design Tic-Tac-Toe
 
 
349. Intersection of Two Arrays
 
 
350. Intersection of Two Arrays II
 
 
353. Design Snake Game
 
 
357. Count Numbers with Unique Digits
 
 
362. Design Hit Counter
 
 
364. Nested List Weight Sum II
 
 
366. Find Leaves of Binary Tree
 
 
367. Valid Perfect Square
 
 
373. Find K Pairs with Smallest Sums
 
 
374. Guess Number Higher or Lower
 
 
375. Guess Number Higher or Lower II
 
 
376. Wiggle Subsequence
 
 
378. Kth Smallest Element in a Sorted Matrix
 
 
380. Insert Delete GetRandom O(1)
 
 
381. Insert Delete GetRandom O(1) - Duplicates allowed
 
 
383. Ransom Note
 
 
384. Shuffle an Array
 
 
387. First Unique Character in a String
 
 
392. Is Subsequence
 
 
394. Decode String
 
 
402. Remove K Digits
 
 
403. Frog Jump
 
 
404. Sum of Left Leaves
 
 
406. Queue Reconstruction by Height
 
 
409. Longest Palindrome
 
 
413. Arithmetic Slices
 
 
414. Third Maximum Number
 
 
417. Pacific Atlantic Water Flow
 
 
437. Path Sum III
 
 
441. Arranging Coins
 
 
442. Find All Duplicates in an Array
 
 
445. Add Two Numbers II
 
 
447. Number of Boomerangs
 
 
448. Find All Numbers Disappeared in an Array
 
 
449. Serialize and Deserialize BST
 
 
450. Delete Node in a BST
 
 
452. Minimum Number of Arrows to Burst Balloons
 
 
455. Assign Cookies
 
 
463. Island Perimeter
 
 
475. Heaters
 
 
476. Number Complement
 
 
480. Sliding Window Median
 
 
482. License Key Formatting
 
 
485. Max Consecutive Ones
 
 
489. Robot Room Cleaner
 
 
490. The Maze
 
 
492. Construct the Rectangle
 
 
494. Target Sum
 
 
496. Next Greater Element I
 
 
500. Keyboard Row
 
 
501. Find Mode in Binary Search Tree
 
 
503. Next Greater Element II
 
 
504. Base 7
 
 
505. The Maze II
 
 
506. Relative Ranks
 
 
507. Perfect Number
 
 
509. Fibonacci Number
 
 
51. N-Queens
 
 
513. Find Bottom Left Tree Value
 
 
515. Find Largest Value in Each Tree Row
 
 
516. Longest Palindromic Subsequence
 
 
518. Coin Change 2
 
 
520. Detect Capital
 
 
528. Random Pick with Weight
 
 
529. Minesweeper
 
 
530. Minimum Absolute Difference in BST
 
 
532. K-diff Pairs in an Array
 
 
535. Encode and Decode TinyURL
 
 
538. Convert BST to Greater Tree
 
 
541. Reverse String II
 
 
542. 01 Matrix
 
 
543. Diameter of Binary Tree
 
 
545. Boundary of Binary Tree
 
 
547. Friend Circles
 
 
551. Student Attendance Record I
 
 
556. Next Greater Element III
 
 
557. Reverse Words in a String III
 
 
559. Maximum Depth of N-ary Tree
 
 
560. Subarray Sum Equals K
 
 
561. Array Partition I
 
 
563. Binary Tree Tilt
 
 
566. Reshape the Matrix
 
 
572. Subtree of Another Tree
 
 
575. Distribute Candies
 
 
581. Shortest Unsorted Continuous Subarray
 
 
589. N-ary Tree Preorder Traversal
 
 
590. N-ary Tree Postorder Traversal
 
 
594. Longest Harmonious Subsequence
 
 
598. Range Addition II
 
 
599. Minimum Index Sum of Two Lists
 
 
605. Can Place Flowers
 
 
606. Construct String from Binary Tree
 
 
617. Merge Two Binary Trees
 
 
621. Task Scheduler
 
 
622. Design Circular Queue
 
 
628. Maximum Product of Three Numbers
 
 
633. Sum of Square Numbers
 
 
637. Average of Levels in Binary Tree
 
 
642. Design Search Autocomplete System
 
 
643. Maximum Average Subarray I
 
 
645. Set Mismatch
 
 
647. Palindromic Substrings
 
 
652. Find Duplicate Subtrees
 
 
653. Two Sum IV - Input is a BST
 
 
654. Maximum Binary Tree
 
 
657. Judge Route Circle
 
 
658. Find K Closest Elements
 
 
659. Split Array into Consecutive Subsequences
 
 
662. Maximum Width of Binary Tree
 
 
665. Non-decreasing Array
 
 
669. Trim a Binary Search Tree
 
 
674. Longest Continuous Increasing Subsequence
 
 
675. Cut Off Trees for Golf Event
 
 
678. Valid Parenthesis String
 
 
680. Valid Palindrome II
 
 
682. Baseball Game
 
 
684. Redundant Connection
 
 
687. Longest Univalue Path
 
 
690. Employee Importance
 
 
692. Top K Frequent Words
 
 
693. Binary Number with Alternating Bits
 
 
694. Number of Distinct Islands
 
 
695. Max Area of Island
 
 
696. Count Binary Substrings
 
 
697. Degree of an Array
 
 
701. Insert into a Binary Search Tree
 
 
703. Kth Largest Element in a Stream
 
 
704. Binary Search
 
 
706. Design HashMap
 
 
709. To Lower Case
 
 
716. Max Stack
 
 
717. 1-bit and 2-bit Characters
 
 
718. Maximum Length of Repeated Subarray
 
 
720. Longest Word in Dictionary
 
 
724. Find Pivot Index
 
 
728. Self Dividing Numbers
 
 
733. Flood Fill
 
 
739. Daily Temperatures
 
 
743. Network Delay Time
 
 
744. Find Smallest Letter Greater Than Target
 
 
746. Min Cost Climbing Stairs
 
 
747. Largest Number At Least Twice of Others
 
 
760. Find Anagram Mappings
 
 
763. Partition Labels
 
 
766. Toeplitz Matrix
 
 
767. Reorganize String
 
 
771. Jewels and Stones
 
 
783. Minimum Distance Between BST Nodes
 
 
784. Letter Case Permutation
 
 
785. Is Graph Bipartite?
 
 
787. Cheapest Flights Within K Stops
 
 
796. Rotate String
 
 
804. Unique Morse Code Words
 
 
811. Subdomain Visit Count
 
 
812. Largest Triangle Area
 
 
814. Binary Tree Pruning
 
 
815. Bus Routes
 
 
819. Most Common Word
 
 
821. Shortest Distance to a Character
 
 
824. Goat Latin
 
 
827. Making A Large Island
 
 
830. Positions of Large Groups
 
 
832. Flipping an Image
 
 
852. Peak Index in a Mountain Array
 
 
861. Score After Flipping Matrix
 
 
863. All Nodes Distance K in Binary Tree
 
 
895. Maximum Frequency Stack
 
 
904. Fruit Into Baskets
 
 
905. Sort Array By Parity
 
 
909. Snakes and Ladders
 
 
929. Unique Email Addresses
 
 
937. Reorder Log Files
 
 
942. DI String Match
 
 
944. Delete Columns to Make Sorted
 
 
947. Most Stones Removed with Same Row or Column
 
 
957. Prison Cells After N Days
 
 
973. K Closest Points to Origin
 
 
994. Rotting Oranges
 
 
Array.md
 
 
BinarySearch.md
 
 
BitManipulation.md
 
 
BreadthFirstSearch.md
 
 
DepthFirstSearch.md
 
 
Design.md
 
 
DynamicProgramming.md
 
 
Easy.md
 
 
Greedy.md
 
 
HashTable.md
 
 
Heap.md
 
 
LinkedList.md
 
 
Medium.md
 
 
ReadMe.md
 
 
Stack.md
 
 
String.md
 
 
Traverse Tree Iteratively
 
 
Tree.md
 
 
TwoPointers.md
 
 

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