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• Arrays / Strings

  • 624. Maximum Distance in Arrays
  • 280. Wiggle Sort
  • 1056. Confusing Number
  • 1427. Perform String Shifts
  • 161. One Edit Distance
  • 186. Reverse Words in a String II
  • 1055. Shortest Way to Form String

• Sliding Window

  • 159. Longest Substring with At Most Two Distinct Characters
  • 340. Longest Substring with At Most K Distinct Characters
  • 487. Max Consecutive Ones II
  • 1100. Find K-Length Substrings With No Repeated Characters

• Hashing

  • 760. Find Anagram Mappings
  • 266. Palindrome Permutation
  • 734. Sentence Similarity
  • 1165. Single-Row Keyboard
  • 249. Group Shifted Strings
  • 1133. Largest Unique Number
  • 1426. Counting Elements
  • 1198. Find Smallest Common Element in All Rows

• Matrix

  • 422. Valid Word Square
  • 531. Lonely Pixel I
  • 311. Sparse Matrix Multiplication
  • 723. Candy Crush

• Interval Set

  • 163. Missing Ranges
  • 252. Meeting Rooms
  • 253. Meeting Rooms II
  • 616. Add Bold Tag in String
  • 1272. Remove Interval

• Stack

  • 439. Ternary Expression Parser
  • 484. Find Permutation
  • 772. Basic Calculator III

• Queue

  • 346. Moving Average from Data Stream
  • 1429. First Unique Number

• Linked List

  • 1474. Delete N Nodes After M Nodes of a Linked List
  • 708. Insert into a Sorted Circular Linked List
  • 369. Plus One Linked List
  • 1265. Print Immutable Linked List in Reverse

• Binary Tree

  • 298. Binary Tree Longest Consecutive Sequence
  • 549. Binary Tree Longest Consecutive Sequence II
  • 250. Count Univalue Subtrees
  • 1120. Maximum Average Subtree
  • 545. Boundary of Binary Tree
  • 366. Find Leaves of Binary Tree
  • 314. Binary Tree Vertical Order Traversal

• Binary Search Tree

  • 270. Closest Binary Search Tree Value
  • 272. Closest Binary Search Tree Value II
  • 255. Verify Preorder Sequence in Binary Search Tree
  • 1214. Two Sum BSTs
  • 333. Largest BST Subtree

• N-ary Tree

  • 1490. Clone N-ary Tree
  • 1506. Find Root of N-Ary Tree
  • 1522. Diameter of N-Ary Tree

• Graph

  • 277. Find the Celebrity
  • 582. Kill Process
  • 323. Number of Connected Components in an Undirected Graph
  • 1059. All Paths from Source Lead to Destination
  • 1236. Web Crawler
  • 305. Number of Islands II
  • 694. Number of Distinct Islands
  • 1136. Parallel Courses

• Graph - Breadth-First Search

  • 490. The Maze
  • 505. The Maze II
  • 499. The Maze III
  • 1197. Minimum Knight Moves
  • 286. Walls and Gates
  • 317. Shortest Distance from All Buildings
  • 269. Alien Dictionary

• Trie

  • 588. Design In-Memory File System
  • 642. Design Search Autocomplete System

• Heap

  • 1086. High Five
  • 1167. Minimum Cost to Connect Sticks
  • 1057. Campus Bikes
  • 358. Rearrange String k Distance Apart

• Binary Search

  • 1228. Missing Number In Arithmetic Progression
  • 1060. Missing Element in Sorted Array
  • 1533. Find the Index of the Large Integer
  • 1150. Check If a Number Is Majority Element in a Sorted Array
  • 1231. Divide Chocolate
  • 644. Maximum Average Subarray II

• Design

  • 348. Design Tic-Tac-Toe
  • 353. Design Snake Game
  • 604. Design Compressed String Iterator
  • 271. Encode and Decode Strings
  • 281. Zigzag Iterator
  • 716. Max Stack
  • 1244. Design A Leaderboard
  • 428. Serialize and Deserialize N-ary Tree
  • 431. Encode N-ary Tree to Binary Tree

• Backtracking

  • 247. Strobogrammatic Number II
  • 254. Factor Combinations
  • 1087. Brace Expansion

• Dynamic Programming

  • 276. Paint Fence
  • 256. Paint House
  • 265. Paint House II
  • 651. 4 Keys Keyboard
  • 1259. Handshakes That Don't Cross

• Mathematics

  • 1134. Armstrong Number
  • 1180. Count Substrings with Only One Distinct Letter
  • 1538. Guess the Majority in a Hidden Array
  • 1183. Maximum Number of Ones

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