LeetCode Tags

Following is a list of relevant tags:

Adobe

• 1832. Check if the Sentence Is Pangram

Amazon

• 1062. Longest Repeating Substring
• 15. 3Sum
• 1832. Check if the Sentence Is Pangram
• 489. Robot Room Cleaner

Array

• 1. Two Sum
• 1039. Minimum Score Triangulation of Polygon
• 105. Construct Binary Tree from Preorder and Inorder Traversal
• 106. Construct Binary Tree from Inorder and Postorder Traversal
• 1091. Shortest Path in Binary Matrix
• 11. Container With Most Water
• 1101. The Earliest Moment When Everyone Become Friends
• 1150. Check If a Number Is Majority Element in a Sorted Array
• 120. Triangle
• 1202. Smallest String With Swaps
• 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
• 1254. Number of Closed Islands
• 128. Longest Consecutive Sequence
• 130. Surrounded Regions
• 1331. Rank Transform of an Array
• 134. Gas Station
• 135. Candy
• 136. Single Number
• 137. Single Number II
• 139. Word Break
• 14. Longest Common Prefix
• 1475. Final Prices With a Special Discount in a Shop
• 149. Max Points on a Line
• 15. 3Sum
• 150. Evaluate Reverse Polish Notation
• 152. Maximum Product Subarray
• 153. Find Minimum in Rotated Sorted Array
• 1584. Min Cost to Connect All Points
• 16. 3Sum Closest
• 162. Find Peak Element
• 163. Missing Ranges
• 1631. Path With Minimum Effort
• 167. Two Sum II - Input Array Is Sorted
• 169. Majority Element
• 18. 4Sum
• 1823. Find the Winner of the Circular Game
• 1851. Minimum Interval to Include Each Query
• 188. Best Time to Buy and Sell Stock IV
• 189. Rotate Array
• 1899. Merge Triplets to Form Target Triplet
• 1966. Binary Searchable Numbers in an Unsorted Array
• 198. House Robber
• 200. Number of Islands
• 2013. Detect Squares
• 202 Kth Smallest In Two Sorted Arrays (Lai)
• 2059. Minimum Operations to Convert Number
• 209. Minimum Size Subarray Sum
• 209. Minimum Size Subarray Sum
• 212. Word Search II
• 213. House Robber II
• 2148. Count Elements With Strictly Smaller and Greater Elements
• 215. Kth Largest Element in an Array
• 216. Combination Sum III
• 217. Contains Duplicate ✅
• 219. Contains Duplicate II
• 221. Maximal Square
• 2246. Longest Path With Different Adjacent Characters
• 2271. Maximum White Tiles Covered by a Carpet
• 2275. Largest Combination With Bitwise AND Greater Than Zero
• 228. Summary Ranges
• 238. Product of Array Except Self
• 239. Sliding Window Maximum
• 247. Strobogrammatic Number II
• 252. Meeting Rooms
• 2540. Minimum Common Value
• 26. Remove Duplicates from Sorted Array
• 268. Missing Number
• 269. Alien Dictionary
• 27. Remove Element
• 271. Encode and Decode Strings
• 274. H-Index
• 2812. Find the Safest Path in a Grid
• 283. Move Zeroes
• 286. Walls and Gates
• 287. Find the Duplicate Number
• 289. Game of Life
• 300. Longest Increasing Subsequence
• 3005. Count Elements With Maximum Frequency ✅
• 307. Range Sum Query - Mutable
• 3075. Maximize Happiness of Selected Children
• 309. Best Time to Buy and Sell Stock with Cooldown
• 31. Next Permutation
• 315. Count of Smaller Numbers After Self
• 3191. Minimum Operations to Make Binary Array Elements Equal to One I
• 322. Coin Change ❤️‍🔥
• 33. Search in Rotated Sorted Array
• 3387. Maximize Amount After Two Days of Conversions
• 34. Find First and Last Position of Element in Sorted Array
• 34. Find First and Last Position of Element in Sorted Array
• 346. Moving Average from Data Stream
• 347. Top K Frequent Elements
• 348. Design Tic-Tac-Toe
• 349. Intersection of Two Arrays
• 3507. Minimum Pair Removal to Sort Array I
• 36. Valid Sudoku
• 362. Design Hit Counter
• 373. Find K Pairs with Smallest Sums
• 377. Combination Sum IV
• 378. Kth Smallest Element in a Sorted Matrix
• 380. Insert Delete GetRandom O(1)
• 39. Combination Sum
• 399. Evaluate Division
• 4. Median of Two Sorted Arrays
• 40. Combination Sum II
• 41. First Missing Positive
• 410. Split Array Largest Sum
• 414. Third Maximum Number
• 417. Pacific Atlantic Water Flow
• 42. Trapping Rain Water
• 425. Word Squares
• 435. Non-overlapping Intervals
• 442. Find All Duplicates in an Array
• 45. Jump Game II
• 452. Minimum Number of Arrows to Burst Balloons
• 46. Permutations
• 48. Rotate Image
• 49. Group Anagrams
• 494. Target Sum ❤️‍🔥
• 496 Next Greater Element I
• 498. Diagonal Traverse
• 502. IPO
• 503 Next Greater Element II
• 51. N-Queens
• 518. Coin Change II
• 52. N-Queens II
• 54. Spiral Matrix
• 540. Single Element in a Sorted Array
• 542. 01 Matrix
• 55. Jump Game
• 56. Merge Intervals
• 560 Subarray Sum Equals K
• 562. Longest Line of Consecutive One in Matrix
• 57. Insert Interval
• 621. Task Scheduler
• 63. Unique Paths II
• 636. Exclusive Time of Functions
• 64. Minimum Path Sum
• 66. Plus One
• 675. Cut Off Trees for Golf Event
• 68. Text Justification
• 695. Max Area of Island
• 704. Binary Search
• 713. Subarray Product Less Than K
• 713. Subarray Product Less Than K
• 720. Longest Word in Dictionary
• 73. Set Matrix Zeroes
• 733. Flood Fill
• 739. Daily Temperatures
• 74. Search a 2D Matrix
• 75. Sort Colors
• 778. Swim in Rising Water
• 78. Subsets
• 79. Word Search
• 80. Remove Duplicates from Sorted Array II
• 809. Expressive Words
• 819. Most Common Word
• 833. Find And Replace in String
• 84. Largest Rectangle in Histogram
• 846. Hand of Straights
• 849. Maximize Distance to Closest Person
• 853. Car Fleet
• 857. Minimum Cost to Hire K Workers
• 875. Koko Eating Bananas
• 88. Merge Sorted Array
• 90. Subsets II
• 904. Fruit Into Baskets
• 909. Snakes and Ladders
• 918. Maximum Sum Circular Subarray
• 929. Unique Email Addresses
• 930. Binary Subarrays With Sum
• 937. Reorder Data in Log Files
• 939. Minimum Area Rectangle
• 952. Largest Component Size by Common Factor
• 957. Prison Cells After N Days
• 973. K Closest Points to Origin
• 975. Odd Even Jump
• 994. Rotting Oranges
• ✅ 1046. Last Stone Weight

Backtracking

• 126. Word Ladder II
• 131. Palindrome Partitioning131. Palindrome Partitioning
• 17. Letter Combinations of a Phone Number
• 212. Word Search II
• 216. Combination Sum III
• 22. Generate Parentheses
• 2375. Construct Smallest Number From DI String
• 351. Android Unlock Patterns
• 39. Combination Sum
• 40. Combination Sum II
• 425. Word Squares
• 46. Permutations
• 489. Robot Room Cleaner
• 494. Target Sum ❤️‍🔥
• 51. N-Queens
• 52. N-Queens II
• 681. Next Closest Time
• 681. Next Closest Time
• 77. Combinations
• 78. Subsets
• 79. Word Search
• 797. All Paths From Source to Target
• 90. Subsets II
• 93. Restore IP Addresses

BeaconFire

• 1062. Longest Repeating Substring
• 562. Longest Line of Consecutive One in Matrix

Binary Indexed Tree

• 307. Range Sum Query - Mutable
• 315. Count of Smaller Numbers After Self

Binary Search

• 1062. Longest Repeating Substring
• 1150. Check If a Number Is Majority Element in a Sorted Array
• 153. Find Minimum in Rotated Sorted Array
• 162. Find Peak Element
• 1631. Path With Minimum Effort
• 167. Two Sum II - Input Array Is Sorted
• 1851. Minimum Interval to Include Each Query
• 1966. Binary Searchable Numbers in an Unsorted Array
• 202 Kth Smallest In Two Sorted Arrays (Lai)
• 2024. Maximize the Confusion of an Exam
• 209. Minimum Size Subarray Sum
• 209. Minimum Size Subarray Sum
• 222. Count Complete Tree Nodes
• 2271. Maximum White Tiles Covered by a Carpet
• 2300. Successful Pairs of Spells and Potions
• 2529. Maximum Count of Positive Integer and Negative Integer
• 2540. Minimum Common Value
• 268. Missing Number
• 278. First Bad Version
• 2812. Find the Safest Path in a Grid
• 287. Find the Duplicate Number
• 300. Longest Increasing Subsequence
• 315. Count of Smaller Numbers After Self
• 3296. Minimum Number of Seconds to Make Mountain Height Zero
• 33. Search in Rotated Sorted Array
• 34. Find First and Last Position of Element in Sorted Array
• 34. Find First and Last Position of Element in Sorted Array
• 3419. Minimize the Maximum Edge Weight of Graph
• 349. Intersection of Two Arrays
• 35. Search Insert Position
• 362. Design Hit Counter
• 374 Guess Number Higher or Lower
• 378. Kth Smallest Element in a Sorted Matrix
• 4. Median of Two Sorted Arrays
• 410. Split Array Largest Sum
• 540. Single Element in a Sorted Array
• 69. Sqrt(x)
• 704. Binary Search
• 74. Search a 2D Matrix
• 778. Swim in Rising Water
• 875. Koko Eating Bananas
• 981. Time Based Key-Value Store

Binary Search Tree

• 173. Binary Search Tree Iterator
• 230. Kth Smallest Element in a BST
• 235. Lowest Common Ancestor of a Binary Search Tree
• 236. Lowest Common Ancestor of a Binary Tree
• 530. Minimum Absolute Difference in BST
• 703. Kth Largest Element in a Stream
• 98. Validate Binary Search Tree

Binary Tree

• 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
• 110. Balanced Binary Tree
• 111. Minimum Depth of Binary Tree
• 112. Path Sum
• 114. Flatten Binary Tree to Linked List
• 116. Populating Next Right Pointers in Each Node
• 117. Populating Next Right Pointers in Each Node II
• 124. Binary Tree Maximum Path Sum
• 129. Sum Root to Leaf Numbers
• 1302. Deepest Leaves Sum
• 1448. Count Good Nodes in Binary Tree
• 173. Binary Search Tree Iterator
• 199. Binary Tree Right Side View
• 222. Count Complete Tree Nodes
• 226. Invert Binary Tree
• 230. Kth Smallest Element in a BST
• 235. Lowest Common Ancestor of a Binary Search Tree
• 236. Lowest Common Ancestor of a Binary Tree
• 297. Serialize and Deserialize Binary Tree
• 337. House Robber III
• 513. Find Bottom Left Tree Value
• 530. Minimum Absolute Difference in BST
• 543. Diameter of Binary Tree
• 572. Subtree of Another Tree
• 637. Average of Levels in Binary Tree
• 703. Kth Largest Element in a Stream
• 951. Flip Equivalent Binary Trees
• 968. Binary Tree Cameras
• 98. Validate Binary Search Tree

Bit Manipulation

• 136. Single Number
• 137. Single Number II
• 190. Reverse Bits
• 191. Number of 1 Bits
• 201. Bitwise AND of Numbers Range
• 222. Count Complete Tree Nodes
• 2220. Minimum Bit Flips to Convert Number
• 2275. Largest Combination With Bitwise AND Greater Than Zero
• 268. Missing Number
• 287. Find the Duplicate Number
• 3191. Minimum Operations to Make Binary Array Elements Equal to One I
• 3370. Smallest Number With All Set Bits
• 338. Counting Bits
• 351. Android Unlock Patterns
• 371. Sum of Two Integers
• 464 Can I Win
• 67. Add Binary
• 78. Subsets
• 90. Subsets II
• 957. Prison Cells After N Days

Bitmask

• 351. Android Unlock Patterns
• 464 Can I Win

Bloomberg

• 1832. Check if the Sentence Is Pangram

Breadth-First Search

• 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
• 1091. Shortest Path in Binary Matrix
• 111. Minimum Depth of Binary Tree
• 112. Path Sum
• 116. Populating Next Right Pointers in Each Node
• 117. Populating Next Right Pointers in Each Node II
• 1202. Smallest String With Swaps
• 1254. Number of Closed Islands
• 126. Word Ladder II
• 127. Word Ladder
• 130. Surrounded Regions
• 1302. Deepest Leaves Sum
• 133. Clone Graph
• 1448. Count Good Nodes in Binary Tree
• 1631. Path With Minimum Effort
• 1971. Find if Path Exists in Graph
• 199. Binary Tree Right Side View
• 200. Number of Islands
• 2059. Minimum Operations to Convert Number
• 207. Course Schedule
• 210. Course Schedule II
• 226. Invert Binary Tree
• 2492. Minimum Score of a Path Between Two Cities
• 261. Graph Valid Tree
• 269. Alien Dictionary
• 2812. Find the Safest Path in a Grid
• 2858. Minimum Edge Reversals So Every Node Is Reachable
• 286. Walls and Gates
• 297. Serialize and Deserialize Binary Tree
• 322. Coin Change ❤️‍🔥
• 323. Number of Connected Components in an Undirected Graph
• 3387. Maximize Amount After Two Days of Conversions
• 399. Evaluate Division
• 417. Pacific Atlantic Water Flow
• 428. Serialize and Deserialize N-ary Tree
• 429. N-ary Tree Level Order Traversal
• 433. Minimum Genetic Mutation
• 513. Find Bottom Left Tree Value
• 530. Minimum Absolute Difference in BST
• 542. 01 Matrix
• 547. Number of Provinces 👍
• 637. Average of Levels in Binary Tree
• 675. Cut Off Trees for Golf Event
• 684. Redundant Connection
• 694. Number of Distinct Islands
• 695. Max Area of Island
• 711. Number of Distinct Islands II
• 733. Flood Fill
• 743. Network Delay Time
• 778. Swim in Rising Water
• 787. Cheapest Flights Within K Stops
• 797. All Paths From Source to Target
• 909. Snakes and Ladders
• 994. Rotting Oranges

Bucket Sort

• 347. Top K Frequent Elements

Citadel

• 489. Robot Room Cleaner

Counting

• 1603. Design Parking System
• 169. Majority Element
• 2013. Detect Squares
• 2275. Largest Combination With Bitwise AND Greater Than Zero
• 3005. Count Elements With Maximum Frequency ✅
• 3228. Maximum Number of Operations to Move Ones to the End
• 347. Top K Frequent Elements
• 383. Ransom Note
• 387. First Unique Character in a String
• 621. Task Scheduler
• 819. Most Common Word

Counting Sort

• 274. H-Index

Cruise

• 489. Robot Room Cleaner

Data Stream

• 295. Find Median from Data Stream
• 346. Moving Average from Data Stream
• 359. Logger Rate Limiter
• 362. Design Hit Counter
• 642. Design Search Autocomplete System
• 703. Kth Largest Element in a Stream
• 901. Online Stock Span

Database

• 175. Combine Two Tables
• 1757. Recyclable and Low Fat Products
• 177. Nth Highest Salary
• 181. Employees Earning More Than Their Managers
• 184. Department Highest Salary
• 184. Department Highest Salary
• 185. Department Top Three Salaries

Depth-First Search

• 100. Same Tree
• 101. Symmetric Tree
• 104. Maximum Depth of Binary Tree
• 110. Balanced Binary Tree
• 111. Minimum Depth of Binary Tree
• 112. Path Sum
• 114. Flatten Binary Tree to Linked List
• 116. Populating Next Right Pointers in Each Node
• 117. Populating Next Right Pointers in Each Node II
• 1202. Smallest String With Swaps
• 124. Binary Tree Maximum Path Sum
• 1254. Number of Closed Islands
• 129. Sum Root to Leaf Numbers
• 130. Surrounded Regions
• 1302. Deepest Leaves Sum
• 133. Clone Graph
• 1448. Count Good Nodes in Binary Tree
• 1522. Diameter of N-Ary Tree
• 1631. Path With Minimum Effort
• 1971. Find if Path Exists in Graph
• 199. Binary Tree Right Side View
• 200. Number of Islands
• 207. Course Schedule
• 210. Course Schedule II
• 211. Design Add and Search Words Data Structure
• 2246. Longest Path With Different Adjacent Characters
• 226. Invert Binary Tree
• 230. Kth Smallest Element in a BST
• 235. Lowest Common Ancestor of a Binary Search Tree
• 236. Lowest Common Ancestor of a Binary Tree
• 2492. Minimum Score of a Path Between Two Cities
• 261. Graph Valid Tree
• 269. Alien Dictionary
• 2858. Minimum Edge Reversals So Every Node Is Reachable
• 297. Serialize and Deserialize Binary Tree
• 323. Number of Connected Components in an Undirected Graph
• 332. Reconstruct Itinerary
• 337. House Robber III
• 3387. Maximize Amount After Two Days of Conversions
• 399. Evaluate Division
• 417. Pacific Atlantic Water Flow
• 428. Serialize and Deserialize N-ary Tree
• 513. Find Bottom Left Tree Value
• 530. Minimum Absolute Difference in BST
• 543. Diameter of Binary Tree
• 547. Number of Provinces 👍
• 572. Subtree of Another Tree
• 637. Average of Levels in Binary Tree
• 642. Design Search Autocomplete System
• 684. Redundant Connection
• 694. Number of Distinct Islands
• 695. Max Area of Island
• 711. Number of Distinct Islands II
• 733. Flood Fill
• 743. Network Delay Time
• 778. Swim in Rising Water
• 787. Cheapest Flights Within K Stops
• 797. All Paths From Source to Target
• 947. Most Stones Removed with Same Row or Column
• 951. Flip Equivalent Binary Trees
• 968. Binary Tree Cameras
• 98. Validate Binary Search Tree

Design

• 146. LRU Cache
• 155. Min Stack
• 1603. Design Parking System
• 173. Binary Search Tree Iterator
• 1797. Design Authentication Manager
• 2013. Detect Squares
• 208. Implement Trie (Prefix Tree)
• 211. Design Add and Search Words Data Structure
• 271. Encode and Decode Strings
• 295. Find Median from Data Stream
• 297. Serialize and Deserialize Binary Tree
• 307. Range Sum Query - Mutable
• 346. Moving Average from Data Stream
• 348. Design Tic-Tac-Toe
• 355. Design Twitter
• 359. Logger Rate Limiter
• 362. Design Hit Counter
• 380. Insert Delete GetRandom O(1)
• 642. Design Search Autocomplete System
• 677. Map Sum Pairs
• 703. Kth Largest Element in a Stream
• 707. Design Linked List
• 895. Maximum Frequency Stack
• 895. Maximum Frequency Stack
• 901. Online Stock Span
• 981. Time Based Key-Value Store

Dijkstra

• 3419. Minimize the Maximum Edge Weight of Graph

Divide And Conquer

• 347. Top K Frequent Elements

Divide and Conquer

• 105. Construct Binary Tree from Preorder and Inorder Traversal
• 106. Construct Binary Tree from Inorder and Postorder Traversal
• 169. Majority Element
• 190. Reverse Bits
• 191. Number of 1 Bits
• 215. Kth Largest Element in an Array
• 23. Merge k Sorted Lists
• 315. Count of Smaller Numbers After Self
• 4. Median of Two Sorted Arrays
• 918. Maximum Sum Circular Subarray
• 973. K Closest Points to Origin

Doubly-Linked List

• 146. LRU Cache
• 1797. Design Authentication Manager
• 3507. Minimum Pair Removal to Sort Array I

Dynamic Programming

• 1039. Minimum Score Triangulation of Polygon
• 1062. Longest Repeating Substring
• 1143. Longest Common Subsequence
• 120. Triangle
• 121. Best Time to Buy and Sell Stock
• 1216. Valid Palindrome III
• 122. Best Time to Buy and Sell Stock II ‼️
• 123. Best Time to Buy and Sell Stock III
• 124. Binary Tree Maximum Path Sum
• 131. Palindrome Partitioning131. Palindrome Partitioning
• 139. Word Break
• 152. Maximum Product Subarray
• 188. Best Time to Buy and Sell Stock IV
• 198. House Robber
• 213. House Robber II
• 22. Generate Parentheses
• 221. Maximal Square
• 2858. Minimum Edge Reversals So Every Node Is Reachable
• 300. Longest Increasing Subsequence
• 309. Best Time to Buy and Sell Stock with Cooldown
• 32. Longest Valid Parentheses
• 322. Coin Change ❤️‍🔥
• 337. House Robber III
• 338. Counting Bits
• 351. Android Unlock Patterns
• 375 Guess Number Higher or Lower II
• 377. Combination Sum IV
• 410. Split Array Largest Sum
• 42. Trapping Rain Water
• 435. Non-overlapping Intervals
• 45. Jump Game II
• 464 Can I Win
• 494. Target Sum ❤️‍🔥
• 5. Longest Palindromic Substring
• 516. Longest Palindromic Subsequence
• 518. Coin Change II
• 542. 01 Matrix
• 55. Jump Game
• 562. Longest Line of Consecutive One in Matrix
• 63. Unique Paths II
• 64. Minimum Path Sum
• 647. Palindromic Substrings
• 678. Valid Parenthesis String
• 70. Climbing Stairs
• 72. Edit Distance
• 787. Cheapest Flights Within K Stops
• 91. Decode Ways
• 918. Maximum Sum Circular Subarray
• 940. Distinct Subsequences II
• 968. Binary Tree Cameras
• 97. Interleaving String
• 975. Odd Even Jump

Enumeration

• 681. Next Closest Time
• 681. Next Closest Time

Eulerian Circuit

• 332. Reconstruct Itinerary

Game Theory

• 375 Guess Number Higher or Lower II
• 464 Can I Win

Geometry

• 149. Max Points on a Line
• 939. Minimum Area Rectangle
• 973. K Closest Points to Origin

Goldman Sachs

• 1062. Longest Repeating Substring
• 1832. Check if the Sentence Is Pangram
• 42. Trapping Rain Water
• 562. Longest Line of Consecutive One in Matrix
• 564. Find the Closest Palindrome
• Chapter 13 Design A Search Autocomplete System

Goldman Sachs VO

• 414. Third Maximum Number

Goldman SachsString

• 642. Design Search Autocomplete System

Google

• 1062. Longest Repeating Substring
• 1631. Path With Minimum Effort
• 1832. Check if the Sentence Is Pangram
• 212. Word Search II
• 2220. Minimum Bit Flips to Convert Number
• 224. Basic Calculator
• 269. Alien Dictionary
• 278. First Bad Version
• 39. Combination Sum
• 410. Split Array Largest Sum
• 42. Trapping Rain Water
• 425. Word Squares
• 482. License Key Formatting
• 489. Robot Room Cleaner
• 562. Longest Line of Consecutive One in Matrix
• 904. Fruit Into Baskets
• 929. Unique Email Addresses

Graph

• 1168. Optimize Water Distribution in a Village
• 133. Clone Graph
• 1584. Min Cost to Connect All Points
• 1971. Find if Path Exists in Graph
• 207. Course Schedule
• 210. Course Schedule II
• 2246. Longest Path With Different Adjacent Characters
• 2492. Minimum Score of a Path Between Two Cities
• 261. Graph Valid Tree
• 269. Alien Dictionary
• 323. Number of Connected Components in an Undirected Graph
• 3310. Remove Methods From Project
• 332. Reconstruct Itinerary
• 3387. Maximize Amount After Two Days of Conversions
• 399. Evaluate Division
• 547. Number of Provinces 👍
• 684. Redundant Connection
• 743. Network Delay Time
• 787. Cheapest Flights Within K Stops
• 797. All Paths From Source to Target
• 947. Most Stones Removed with Same Row or Column

Graph Theory

• 2858. Minimum Edge Reversals So Every Node Is Reachable

Greedy

• 11. Container With Most Water
• 122. Best Time to Buy and Sell Stock II ‼️
• 134. Gas Station
• 135. Candy
• 1899. Merge Triplets to Form Target Triplet
• 2271. Maximum White Tiles Covered by a Carpet
• 2375. Construct Smallest Number From DI String
• 3075. Maximize Happiness of Selected Children
• 3228. Maximum Number of Operations to Move Ones to the End
• 3397. Maximum Number of Distinct Elements After Operations
• 3403. Find the Lexicographically Largest String From the Box I
• 410. Split Array Largest Sum
• 435. Non-overlapping Intervals
• 45. Jump Game II
• 452. Minimum Number of Arrows to Burst Balloons
• 502. IPO
• 55. Jump Game
• 621. Task Scheduler
• 678. Valid Parenthesis String
• 763. Partition Labels
• 846. Hand of Straights
• 857. Minimum Cost to Hire K Workers

Hash Function

• 1062. Longest Repeating Substring
• 572. Subtree of Another Tree
• 694. Number of Distinct Islands
• 711. Number of Distinct Islands II

Hash Table

• 1. Two Sum
• 105. Construct Binary Tree from Preorder and Inorder Traversal
• 106. Construct Binary Tree from Inorder and Postorder Traversal
• 1100 Find K-Length Substrings With No Repeated Characters
• 12. Integer to Roman
• 1202. Smallest String With Swaps
• 126. Word Ladder II
• 127. Word Ladder
• 128. Longest Consecutive Sequence
• 13. Roman to Integer
• 133. Clone Graph
• 1331. Rank Transform of an Array
• 138. Copy List with Random Pointer
• 139. Word Break
• 141. Linked List Cycle
• 142. Linked List Cycle II
• 146. LRU Cache
• 149. Max Points on a Line
• 160. Intersection of Two Linked Lists
• 166. Fraction to Recurring Decimal
• 169. Majority Element
• 17. Letter Combinations of a Phone Number
• 1797. Design Authentication Manager
• 1832. Check if the Sentence Is Pangram
• 2013. Detect Squares
• 202. Happy Number
• 205. Isomorphic Strings
• 208. Implement Trie (Prefix Tree)
• 217. Contains Duplicate ✅
• 219. Contains Duplicate II
• 2275. Largest Combination With Bitwise AND Greater Than Zero
• 242. Valid Anagram ✅
• 246. Strobogrammatic Number
• 2540. Minimum Common Value
• 268. Missing Number
• 290. Word Pattern
• 3. Longest Substring Without Repeating Characters
• 3. Longest Substring Without Repeating Characters
• 3005. Count Elements With Maximum Frequency ✅
• 347. Top K Frequent Elements
• 348. Design Tic-Tac-Toe
• 349. Intersection of Two Arrays
• 3507. Minimum Pair Removal to Sort Array I
• 355. Design Twitter
• 359. Logger Rate Limiter
• 36. Valid Sudoku
• 380. Insert Delete GetRandom O(1)
• 383. Ransom Note
• 387. First Unique Character in a String
• 41. First Missing Positive
• 424. Longest Repeating Character Replacement
• 433. Minimum Genetic Mutation
• 438 Find All Anagrams in a String
• 442. Find All Duplicates in an Array
• 49. Group Anagrams
• 496 Next Greater Element I
• 560 Subarray Sum Equals K
• 567. Permutation in String
• 621. Task Scheduler
• 677. Map Sum Pairs
• 681. Next Closest Time
• 681. Next Closest Time
• 694. Number of Distinct Islands
• 711. Number of Distinct Islands II
• 720. Longest Word in Dictionary
• 73. Set Matrix Zeroes
• 76. Minimum Window Substring
• 76. Minimum Window Substring
• 763. Partition Labels
• 771. Jewels and Stones
• 819. Most Common Word
• 833. Find And Replace in String
• 846. Hand of Straights
• 895. Maximum Frequency Stack
• 895. Maximum Frequency Stack
• 904. Fruit Into Baskets
• 929. Unique Email Addresses
• 930. Binary Subarrays With Sum
• 939. Minimum Area Rectangle
• 947. Most Stones Removed with Same Row or Column
• 952. Largest Component Size by Common Factor
• 957. Prison Cells After N Days
• 981. Time Based Key-Value Store

Heap (Priority Queue)

• 1168. Optimize Water Distribution in a Village
• 1631. Path With Minimum Effort
• 1851. Minimum Interval to Include Each Query
• 215. Kth Largest Element in an Array
• 23. Merge k Sorted Lists
• 239. Sliding Window Maximum
• 295. Find Median from Data Stream
• 347. Top K Frequent Elements
• 3507. Minimum Pair Removal to Sort Array I
• 355. Design Twitter
• 373. Find K Pairs with Smallest Sums
• 378. Kth Smallest Element in a Sorted Matrix
• 502. IPO
• 621. Task Scheduler
• 642. Design Search Autocomplete System
• 675. Cut Off Trees for Golf Event
• 703. Kth Largest Element in a Stream
• 743. Network Delay Time
• 778. Swim in Rising Water
• 787. Cheapest Flights Within K Stops
• 857. Minimum Cost to Hire K Workers
• 973. K Closest Points to Origin
• ✅ 1046. Last Stone Weight

Interactive

• 278. First Bad Version
• 374 Guess Number Higher or Lower
• 489. Robot Room Cleaner

Interview

• 344. Reverse String

Iterator

• 173. Binary Search Tree Iterator

JavaScript

• 2620. Counter

Knuth-Morris-Pratt

• 28. Find the Index of the First Occurrence in a String

Line Sweep

• 1851. Minimum Interval to Include Each Query

Linked List

• 114. Flatten Binary Tree to Linked List
• 116. Populating Next Right Pointers in Each Node
• 117. Populating Next Right Pointers in Each Node II
• 138. Copy List with Random Pointer
• 141. Linked List Cycle
• 142. Linked List Cycle II
• 143. Reorder List
• 146. LRU Cache
• 160. Intersection of Two Linked Lists
• 1797. Design Authentication Manager
• 19. Remove Nth Node From End of List ✅
• 2. Add Two Numbers
• 203 Remove Linked List Elements
• 206. Reverse Linked List
• 21. Merge Two Sorted Lists ✅
• 23. Merge k Sorted Lists
• 237. Delete Node in a Linked List
• 25. Reverse Nodes in k-Group
• 3507. Minimum Pair Removal to Sort Array I
• 355. Design Twitter
• 61. Rotate List
• 707. Design Linked List
• 82. Remove Duplicates from Sorted List II
• 86. Partition List

Math

• 1185. Day of the Week
• 12. Integer to Roman
• 13. Roman to Integer
• 149. Max Points on a Line
• 150. Evaluate Reverse Polish Notation
• 166. Fraction to Recurring Decimal
• 172. Factorial Trailing Zeroes
• 1823. Find the Winner of the Circular Game
• 189. Rotate Array
• 2. Add Two Numbers
• 202. Happy Number
• 224. Basic Calculator
• 2485. Find the Pivot Integer
• 258. Add Digits
• 263. Ugly Number
• 268. Missing Number
• 273. Integer to English Words
• 371. Sum of Two Integers
• 375 Guess Number Higher or Lower II
• 380. Insert Delete GetRandom O(1)
• 43. Multiply Strings
• 464 Can I Win
• 48. Rotate Image
• 50. Pow(x, n)
• 556 Next Greater Element III
• 564. Find the Closest Palindrome
• 66. Plus One
• 67. Add Binary
• 69. Sqrt(x)
• 7. Reverse Integer
• 70. Climbing Stairs
• 772. Basic Calculator III
• 9. Palindrome Number
• 939. Minimum Area Rectangle
• 952. Largest Component Size by Common Factor
• 957. Prison Cells After N Days
• 973. K Closest Points to Origin

Matrix

• 1091. Shortest Path in Binary Matrix
• 1254. Number of Closed Islands
• 130. Surrounded Regions
• 1631. Path With Minimum Effort
• 200. Number of Islands
• 212. Word Search II
• 221. Maximal Square
• 2812. Find the Safest Path in a Grid
• 286. Walls and Gates
• 289. Game of Life
• 348. Design Tic-Tac-Toe
• 36. Valid Sudoku
• 378. Kth Smallest Element in a Sorted Matrix
• 417. Pacific Atlantic Water Flow
• 48. Rotate Image
• 498. Diagonal Traverse
• 54. Spiral Matrix
• 542. 01 Matrix
• 562. Longest Line of Consecutive One in Matrix
• 63. Unique Paths II
• 64. Minimum Path Sum
• 675. Cut Off Trees for Golf Event
• 695. Max Area of Island
• 73. Set Matrix Zeroes
• 733. Flood Fill
• 74. Search a 2D Matrix
• 778. Swim in Rising Water
• 79. Word Search
• 909. Snakes and Ladders
• 994. Rotting Oranges

Memoization

• 139. Word Break
• 464 Can I Win
• 70. Climbing Stairs

Merge Sort

• 23. Merge k Sorted Lists
• 315. Count of Smaller Numbers After Self

Meta

• 489. Robot Room Cleaner

Microsoft

• 1475. Final Prices With a Special Discount in a Shop
• 152. Maximum Product Subarray
• 16. 3Sum Closest
• 1797. Design Authentication Manager
• 18. 4Sum
• 1832. Check if the Sentence Is Pangram
• 1966. Binary Searchable Numbers in an Unsorted Array
• 239. Sliding Window Maximum
• 2620. Counter
• 283. Move Zeroes
• 2858. Minimum Edge Reversals So Every Node Is Reachable
• 3. Longest Substring Without Repeating Characters
• 3075. Maximize Happiness of Selected Children
• 3191. Minimum Operations to Make Binary Array Elements Equal to One I
• 33. Search in Rotated Sorted Array
• 3507. Minimum Pair Removal to Sort Array I
• 424. Longest Repeating Character Replacement
• 489. Robot Room Cleaner
• 498. Diagonal Traverse
• 540. Single Element in a Sorted Array
• 58. Length of Last Word
• 7. Reverse Integer
• 707. Design Linked List
• 75. Sort Colors
• 761. Special Binary String
• 787. Cheapest Flights Within K Stops
• 875. Koko Eating Bananas
• 9. Palindrome Number
• 901. Online Stock Span
• 93. Restore IP Addresses
• 952. Largest Component Size by Common Factor

Minimum Spanning Tree

• 1168. Optimize Water Distribution in a Village
• 1584. Min Cost to Connect All Points

Monotonic Queue

• 239. Sliding Window Maximum
• 918. Maximum Sum Circular Subarray

Monotonic Stack

• 1475. Final Prices With a Special Discount in a Shop
• 42. Trapping Rain Water
• 496 Next Greater Element I
• 503 Next Greater Element II
• 739. Daily Temperatures
• 84. Largest Rectangle in Histogram
• 853. Car Fleet
• 901. Online Stock Span
• 975. Odd Even Jump

Number Theory

• 258. Add Digits
• 952. Largest Component Size by Common Factor

Ordered Set

• 315. Count of Smaller Numbers After Self
• 3507. Minimum Pair Removal to Sort Array I
• 895. Maximum Frequency Stack
• 895. Maximum Frequency Stack
• 975. Odd Even Jump

Prefix Sum

• 2024. Maximize the Confusion of an Exam
• 209. Minimum Size Subarray Sum
• 209. Minimum Size Subarray Sum
• 2271. Maximum White Tiles Covered by a Carpet
• 238. Product of Array Except Self
• 2485. Find the Pivot Integer
• 3191. Minimum Operations to Make Binary Array Elements Equal to One I
• 410. Split Array Largest Sum
• 560 Subarray Sum Equals K
• 930. Binary Subarrays With Sum

Queue

• 1823. Find the Winner of the Circular Game
• 239. Sliding Window Maximum
• 3191. Minimum Operations to Make Binary Array Elements Equal to One I
• 346. Moving Average from Data Stream
• 362. Design Hit Counter
• 387. First Unique Character in a String
• 918. Maximum Sum Circular Subarray

Quickselect

• 215. Kth Largest Element in an Array
• 347. Top K Frequent Elements
• 973. K Closest Points to Origin

Randomized

• 380. Insert Delete GetRandom O(1)

Recursion

• 143. Reorder List
• 1823. Find the Winner of the Circular Game
• 2. Add Two Numbers
• 203 Remove Linked List Elements
• 206. Reverse Linked List
• 21. Merge Two Sorted Lists ✅
• 247. Strobogrammatic Number II
• 25. Reverse Nodes in k-Group
• 273. Integer to English Words
• 394. Decode String
• 50. Pow(x, n)
• 761. Special Binary String
• 772. Basic Calculator III

Remember

• 315. Count of Smaller Numbers After Self
• 91. Decode Ways

Rolling Hash

• 1062. Longest Repeating Substring

Segment Tree

• 307. Range Sum Query - Mutable
• 315. Count of Smaller Numbers After Self

Shortest Path

• 399. Evaluate Division
• 743. Network Delay Time
• 787. Cheapest Flights Within K Stops

Simulation

• 1603. Design Parking System
• 1823. Find the Winner of the Circular Game
• 258. Add Digits
• 289. Game of Life
• 348. Design Tic-Tac-Toe
• 3507. Minimum Pair Removal to Sort Array I
• 43. Multiply Strings
• 498. Diagonal Traverse
• 54. Spiral Matrix
• 67. Add Binary
• 68. Text Justification

Sliding Window

• 1100 Find K-Length Substrings With No Repeated Characters
• 2024. Maximize the Confusion of an Exam
• 209. Minimum Size Subarray Sum
• 209. Minimum Size Subarray Sum
• 219. Contains Duplicate II
• 239. Sliding Window Maximum
• 3. Longest Substring Without Repeating Characters
• 3. Longest Substring Without Repeating Characters
• 3191. Minimum Operations to Make Binary Array Elements Equal to One I
• 424. Longest Repeating Character Replacement
• 438 Find All Anagrams in a String
• 567. Permutation in String
• 713. Subarray Product Less Than K
• 713. Subarray Product Less Than K
• 76. Minimum Window Substring
• 76. Minimum Window Substring
• 904. Fruit Into Baskets
• 930. Binary Subarrays With Sum

Sorting

• 1101. The Earliest Moment When Everyone Become Friends
• 1202. Smallest String With Swaps
• 1331. Rank Transform of an Array
• 15. 3Sum
• 16. 3Sum Closest
• 169. Majority Element
• 18. 4Sum
• 1851. Minimum Interval to Include Each Query
• 2148. Count Elements With Strictly Smaller and Greater Elements
• 215. Kth Largest Element in an Array
• 217. Contains Duplicate ✅
• 2271. Maximum White Tiles Covered by a Carpet
• 242. Valid Anagram ✅
• 252. Meeting Rooms
• 268. Missing Number
• 274. H-Index
• 295. Find Median from Data Stream
• 3075. Maximize Happiness of Selected Children
• 347. Top K Frequent Elements
• 349. Intersection of Two Arrays
• 378. Kth Smallest Element in a Sorted Matrix
• 414. Third Maximum Number
• 435. Non-overlapping Intervals
• 452. Minimum Number of Arrows to Burst Balloons
• 49. Group Anagrams
• 502. IPO
• 56. Merge Intervals
• 621. Task Scheduler
• 642. Design Search Autocomplete System
• 720. Longest Word in Dictionary
• 75. Sort Colors
• 833. Find And Replace in String
• 846. Hand of Straights
• 853. Car Fleet
• 857. Minimum Cost to Hire K Workers
• 88. Merge Sorted Array
• 937. Reorder Data in Log Files
• 939. Minimum Area Rectangle
• 973. K Closest Points to Origin

Stack

• 114. Flatten Binary Tree to Linked List
• 143. Reorder List
• 1475. Final Prices With a Special Discount in a Shop
• 150. Evaluate Reverse Polish Notation
• 155. Min Stack
• 173. Binary Search Tree Iterator
• 20. Valid Parentheses
• 224. Basic Calculator
• 2375. Construct Smallest Number From DI String
• 32. Longest Valid Parentheses
• 394. Decode String
• 42. Trapping Rain Water
• 496 Next Greater Element I
• 503 Next Greater Element II
• 636. Exclusive Time of Functions
• 678. Valid Parenthesis String
• 739. Daily Temperatures
• 772. Basic Calculator III
• 84. Largest Rectangle in Histogram
• 853. Car Fleet
• 895. Maximum Frequency Stack
• 895. Maximum Frequency Stack
• 901. Online Stock Span
• 975. Odd Even Jump

Stream API

• 347. Top K Frequent Elements
• 771. Jewels and Stones

String

• 1062. Longest Repeating Substring
• 1100 Find K-Length Substrings With No Repeated Characters
• 1143. Longest Common Subsequence
• 12. Integer to Roman
• 1202. Smallest String With Swaps
• 1216. Valid Palindrome III
• 125. Valid Palindrome
• 126. Word Ladder II
• 127. Word Ladder
• 13. Roman to Integer
• 131. Palindrome Partitioning131. Palindrome Partitioning
• 139. Word Break
• 14. Longest Common Prefix
• 151. Reverse Words in a String
• 165. Compare Version Numbers
• 166. Fraction to Recurring Decimal
• 17. Letter Combinations of a Phone Number
• 1750. Minimum Length of String After Deleting Similar Ends
• 1768. Merge Strings Alternately
• 1832. Check if the Sentence Is Pangram
• 1957. Delete Characters to Make Fancy String
• 20. Valid Parentheses
• 2024. Maximize the Confusion of an Exam
• 205. Isomorphic Strings
• 208. Implement Trie (Prefix Tree)
• 211. Design Add and Search Words Data Structure
• 212. Word Search II
• 22. Generate Parentheses
• 224. Basic Calculator
• 2246. Longest Path With Different Adjacent Characters
• 2375. Construct Smallest Number From DI String
• 242. Valid Anagram ✅
• 246. Strobogrammatic Number
• 247. Strobogrammatic Number II
• 2490. Circular Sentence
• 269. Alien Dictionary
• 271. Encode and Decode Strings
• 273. Integer to English Words
• 28. Find the Index of the First Occurrence in a String
• 290. Word Pattern
• 2914. Minimum Number of Changes to Make Binary String Beautiful
• 297. Serialize and Deserialize Binary Tree
• 3. Longest Substring Without Repeating Characters
• 3. Longest Substring Without Repeating Characters
• 32. Longest Valid Parentheses
• 3228. Maximum Number of Operations to Move Ones to the End
• 3387. Maximize Amount After Two Days of Conversions
• 344. Reverse String
• 383. Ransom Note
• 387. First Unique Character in a String
• 394. Decode String
• 399. Evaluate Division
• 424. Longest Repeating Character Replacement
• 425. Word Squares
• 428. Serialize and Deserialize N-ary Tree
• 43. Multiply Strings
• 433. Minimum Genetic Mutation
• 438 Find All Anagrams in a String
• 482. License Key Formatting
• 49. Group Anagrams
• 5. Longest Palindromic Substring
• 516. Longest Palindromic Subsequence
• 556 Next Greater Element III
• 564. Find the Closest Palindrome
• 567. Permutation in String
• 58. Length of Last Word
• 6. Zigzag Conversion
• 647. Palindromic Substrings
• 67. Add Binary
• 677. Map Sum Pairs
• 678. Valid Parenthesis String
• 68. Text Justification
• 681. Next Closest Time
• 681. Next Closest Time
• 72. Edit Distance
• 720. Longest Word in Dictionary
• 76. Minimum Window Substring
• 76. Minimum Window Substring
• 761. Special Binary String
• 763. Partition Labels
• 771. Jewels and Stones
• 772. Basic Calculator III
• 8. String to Integer (atoi)
• 809. Expressive Words
• 819. Most Common Word
• 833. Find And Replace in String
• 91. Decode Ways
• 929. Unique Email Addresses
• 93. Restore IP Addresses
• 937. Reorder Data in Log Files
• 940. Distinct Subsequences II
• 97. Interleaving String
• 981. Time Based Key-Value Store

String Matching

• 28. Find the Index of the First Occurrence in a String
• 572. Subtree of Another Tree

Suffix Array

• 1062. Longest Repeating Substring

System Design

• Chapter 13 Design A Search Autocomplete System

TikTok

• 1062. Longest Repeating Substring
• 489. Robot Room Cleaner
• 562. Longest Line of Consecutive One in Matrix

Top Interveiw 150

• 111. Minimum Depth of Binary Tree
• 128. Longest Consecutive Sequence

Top Interveiws

• 153. Find Minimum in Rotated Sorted Array

Top Interview

• 63. Unique Paths II
• 64. Minimum Path Sum

Top Interview 150

• 100. Same Tree
• 101. Symmetric Tree
• 102. Binary Tree Level Order Traversal
• 103. Binary Tree Zigzag Level Order Traversal
• 106. Construct Binary Tree from Inorder and Postorder Traversal
• 110. Balanced Binary Tree
• 112. Path Sum
• 114. Flatten Binary Tree to Linked List
• 117. Populating Next Right Pointers in Each Node II
• 129. Sum Root to Leaf Numbers
• 13. Roman to Integer
• 130. Surrounded Regions
• 134. Gas Station
• 135. Candy
• 138. Copy List with Random Pointer
• 14. Longest Common Prefix
• 142. Linked List Cycle II
• 150. Evaluate Reverse Polish Notation
• 151. Reverse Words in a String
• 155. Min Stack
• 162. Find Peak Element
• 169. Majority Element
• 173. Binary Search Tree Iterator
• 189. Rotate Array
• 199. Binary Tree Right Side View
• 20. Valid Parentheses
• 200. Number of Islands
• 202. Happy Number
• 205. Isomorphic Strings
• 207. Course Schedule
• 21. Merge Two Sorted Lists ✅
• 210. Course Schedule II
• 219. Contains Duplicate II
• 222. Count Complete Tree Nodes
• 224. Basic Calculator
• 226. Invert Binary Tree
• 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
• 25. Reverse Nodes in k-Group
• 27. Remove Element
• 274. H-Index
• 290. Word Pattern
• 35. Search Insert Position
• 380. Insert Delete GetRandom O(1)
• 383. Ransom Note
• 392. Is Subsequence
• 399. Evaluate Division
• 4. Median of Two Sorted Arrays
• 433. Minimum Genetic Mutation
• 46. Permutations
• 494. Target Sum ❤️‍🔥
• 50. Pow(x, n)
• 513. Find Bottom Left Tree Value
• 52. N-Queens II
• 530. Minimum Absolute Difference in BST
• 61. Rotate List
• 637. Average of Levels in Binary Tree
• 68. Text Justification
• 70. Climbing Stairs
• 739. Daily Temperatures
• 77. Combinations
• 82. Remove Duplicates from Sorted List II
• 86. Partition List
• 88. Merge Sorted Array
• 909. Snakes and Ladders
• 98. Validate Binary Search Tree

Top Interview 180

• 6. Zigzag Conversion

Top Interviews

• 1039. Minimum Score Triangulation of Polygon
• 11. Container With Most Water
• 1143. Longest Common Subsequence
• 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
• 1254. Number of Closed Islands
• 127. Word Ladder
• 136. Single Number
• 137. Single Number II
• 139. Word Break
• 146. LRU Cache
• 149. Max Points on a Line
• 15. 3Sum
• 167. Two Sum II - Input Array Is Sorted
• 17. Letter Combinations of a Phone Number
• 172. Factorial Trailing Zeroes
• 188. Best Time to Buy and Sell Stock IV
• 190. Reverse Bits
• 191. Number of 1 Bits
• 198. House Robber
• 2. Add Two Numbers
• 201. Bitwise AND of Numbers Range
• 208. Implement Trie (Prefix Tree)
• 212. Word Search II
• 221. Maximal Square
• 2246. Longest Path With Different Adjacent Characters
• 228. Summary Ranges
• 26. Remove Duplicates from Sorted Array
• 278. First Bad Version
• 28. Find the Index of the First Occurrence in a String
• 289. Game of Life
• 295. Find Median from Data Stream
• 3. Longest Substring Without Repeating Characters
• 300. Longest Increasing Subsequence
• 309. Best Time to Buy and Sell Stock with Cooldown
• 32. Longest Valid Parentheses
• 322. Coin Change ❤️‍🔥
• 33. Search in Rotated Sorted Array
• 337. House Robber III
• 36. Valid Sudoku
• 373. Find K Pairs with Smallest Sums
• 39. Combination Sum
• 42. Trapping Rain Water
• 45. Jump Game II
• 452. Minimum Number of Arrows to Burst Balloons
• 48. Rotate Image
• 49. Group Anagrams
• 5. Longest Palindromic Substring
• 516. Longest Palindromic Subsequence
• 54. Spiral Matrix
• 543. Diameter of Binary Tree
• 55. Jump Game
• 56. Merge Intervals
• 57. Insert Interval
• 58. Length of Last Word
• 67. Add Binary
• 69. Sqrt(x)
• 72. Edit Distance
• 73. Set Matrix Zeroes
• 74. Search a 2D Matrix
• 9. Palindrome Number
• 91. Decode Ways
• 918. Maximum Sum Circular Subarray
• 968. Binary Tree Cameras
• 97. Interleaving String

Topological Sort

• 207. Course Schedule
• 210. Course Schedule II
• 2246. Longest Path With Different Adjacent Characters
• 269. Alien Dictionary

Tree

• 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
• 110. Balanced Binary Tree
• 111. Minimum Depth of Binary Tree
• 112. Path Sum
• 114. Flatten Binary Tree to Linked List
• 116. Populating Next Right Pointers in Each Node
• 117. Populating Next Right Pointers in Each Node II
• 124. Binary Tree Maximum Path Sum
• 129. Sum Root to Leaf Numbers
• 1302. Deepest Leaves Sum
• 1448. Count Good Nodes in Binary Tree
• 1522. Diameter of N-Ary Tree
• 173. Binary Search Tree Iterator
• 199. Binary Tree Right Side View
• 222. Count Complete Tree Nodes
• 2246. Longest Path With Different Adjacent Characters
• 226. Invert Binary Tree
• 230. Kth Smallest Element in a BST
• 235. Lowest Common Ancestor of a Binary Search Tree
• 236. Lowest Common Ancestor of a Binary Tree
• 297. Serialize and Deserialize Binary Tree
• 337. House Robber III
• 428. Serialize and Deserialize N-ary Tree
• 429. N-ary Tree Level Order Traversal
• 513. Find Bottom Left Tree Value
• 530. Minimum Absolute Difference in BST
• 543. Diameter of Binary Tree
• 572. Subtree of Another Tree
• 637. Average of Levels in Binary Tree
• 703. Kth Largest Element in a Stream
• 951. Flip Equivalent Binary Trees
• 968. Binary Tree Cameras
• 98. Validate Binary Search Tree

Trie

• 139. Word Break
• 14. Longest Common Prefix
• 208. Implement Trie (Prefix Tree)
• 211. Design Add and Search Words Data Structure
• 212. Word Search II
• 425. Word Squares
• 642. Design Search Autocomplete System
• 677. Map Sum Pairs
• 720. Longest Word in Dictionary

Two Pointers

• 11. Container With Most Water
• 125. Valid Palindrome
• 141. Linked List Cycle
• 142. Linked List Cycle II
• 143. Reorder List
• 15. 3Sum
• 151. Reverse Words in a String
• 16. 3Sum Closest
• 160. Intersection of Two Linked Lists
• 165. Compare Version Numbers
• 167. Two Sum II - Input Array Is Sorted
• 1750. Minimum Length of String After Deleting Similar Ends
• 1768. Merge Strings Alternately
• 18. 4Sum
• 189. Rotate Array
• 19. Remove Nth Node From End of List ✅
• 202. Happy Number
• 246. Strobogrammatic Number
• 2540. Minimum Common Value
• 26. Remove Duplicates from Sorted Array
• 27. Remove Element
• 28. Find the Index of the First Occurrence in a String
• 283. Move Zeroes
• 287. Find the Duplicate Number
• 295. Find Median from Data Stream
• 31. Next Permutation
• 344. Reverse String
• 349. Intersection of Two Arrays
• 392. Is Subsequence
• 42. Trapping Rain Water
• 5. Longest Palindromic Substring
• 556 Next Greater Element III
• 567. Permutation in String
• 61. Rotate List
• 647. Palindromic Substrings
• 75. Sort Colors
• 763. Partition Labels
• 80. Remove Duplicates from Sorted Array II
• 809. Expressive Words
• 82. Remove Duplicates from Sorted List II
• 86. Partition List
• 88. Merge Sorted Array

TypeScript

• 2620. Counter

Union Find

• 1101. The Earliest Moment When Everyone Become Friends
• 1168. Optimize Water Distribution in a Village
• 1202. Smallest String With Swaps
• 1254. Number of Closed Islands
• 128. Longest Consecutive Sequence
• 130. Surrounded Regions
• 1584. Min Cost to Connect All Points
• 1631. Path With Minimum Effort
• 1971. Find if Path Exists in Graph
• 200. Number of Islands
• 2492. Minimum Score of a Path Between Two Cities
• 261. Graph Valid Tree
• 2812. Find the Safest Path in a Grid
• 323. Number of Connected Components in an Undirected Graph
• 399. Evaluate Division
• 547. Number of Provinces 👍
• 684. Redundant Connection
• 694. Number of Distinct Islands
• 695. Max Area of Island
• 711. Number of Distinct Islands II
• 778. Swim in Rising Water
• 947. Most Stones Removed with Same Row or Column

Union-Find

• 952. Largest Component Size by Common Factor

Vanguard

• 1832. Check if the Sentence Is Pangram

Weekly Contest 105

• 918. Maximum Sum Circular Subarray

grid dp

• 3418. Maximum Amount of Money Robot Can Earn

tcs

• 1832. Check if the Sentence Is Pangram

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