Page Index - cocoder39/coco39_LC GitHub Wiki

578 page(s) in this GitHub Wiki:

• Home
• 1. Two Sum
• 10. Regular Expression Matching
• 100. Same Tree
• 1004. Max Consecutive Ones III
• 101. Symmetric Tree
• 102. Binary Tree Level Order Traversal
• 1024. Video Stitching
• 103. Binary Tree Zigzag Level Order Traversal
• 104. Maximum Depth of Binary Tree
• 1041. Robot Bounded In Circle
• 1042. Flower Planting With No Adjacent
• 1047. Remove All Adjacent Duplicates In String
• 1048. Longest String Chain
• 105. Construct Binary Tree from Preorder and Inorder Traversal
• 1058. Minimize Rounding Error to Meet Target
• 106. Construct Binary Tree from Inorder and Postorder Traversal
• 1060. Missing Element in Sorted Array
• 107. Binary Tree Level Order Traversal II
• 108. Convert Sorted Array to Binary Search Tree
• 109. Convert Sorted List to Binary Search Tree
• 1091. Shortest Path in Binary Matrix
• 1094. Car Pooling
• 11. Container With Most Water
• 110. Balanced Binary Tree
• 1109. Corporate Flight Bookings
• 111. Minimum Depth of Binary Tree
• 1110. Delete Nodes And Return Forest
• 1114. Print in Order
• 1115. Print FooBar Alternately
• 1116. Print Zero Even Odd
• 1117. Building H2O
• 112. Path Sum
• 113. Path Sum II
• 1130. Minimum Cost Tree From Leaf Values
• 114. Flatten Binary Tree to Linked List
• 1140. Stone Game II
• 1143. Longest Common Subsequence
• 1146. Snapshot Array
• 115. Distinct Subsequences
• 1153. String Transforms Into Another String
• 116. Populating Next Right Pointers in Each Node
• 1162. As Far from Land as Possible
• 1166. Design File System
• 117. Populating Next Right Pointers in Each Node II
• 1188. Design Bounded Blocking Queue
• 1192. Critical Connections in a Network
• 1195. Fizz Buzz Multithreaded
• 1197. Minimum Knight Moves
• 120. Triangle
• 1202. Smallest String With Swaps
• 1206. Design Skiplist
• 1209. Remove All Adjacent Duplicates in String II
• 121. Best Time to Buy and Sell Stock
• 1216. Valid Palindrome III
• 122. Best Time to Buy and Sell Stock II
• 1226. The Dining Philosophers
• 1229. Meeting Scheduler
• 123. Best Time to Buy and Sell Stock III
• 1235. Maximum Profit in Job Scheduling
• 124. Binary Tree Maximum Path Sum
• 1242. Web Crawler Multithreaded
• 1249. Minimum Remove to Make Valid Parentheses
• 1257. Smallest Common Region
• 126. Word Ladder II
• 1268. Search Suggestions System
• 127. Word Ladder
• 1279. Traffic Light Controlled Intersection
• 128. Longest Consecutive Sequence
• 129. Sum Root to Leaf Numbers
• 13. Roman to Integer
• 130. Surrounded Regions
• 131. Palindrome Partitioning
• 1314. Matrix Block Sum
• 132. Palindrome Partitioning II
• 1326. Minimum Number of Taps to Open to Water a Garden
• 133. Clone Graph
• 1334. Find the City With the Smallest Number of Neighbors at a Threshold Distance
• 134. Gas Station
• 1352. Product of the Last K Numbers
• 1359. Count All Valid Pickup and Delivery Options
• 1361. Validate Binary Tree Nodes
• 138. Copy List with Random Pointer
• 1382. Balance a Binary Search Tree
• 1386. Cinema Seat Allocation
• 139. Word Break
• 14. Longest Common Prefix
• 140. Word Break II
• 1404. Number of Steps to Reduce a Number in Binary Representation to One
• 1405. Longest Happy String
• 141. Linked List Cycle
• 142. Linked List Cycle II
• 1423. Maximum Points You Can Obtain from Cards
• 1424. Diagonal Traverse II
• 1428. Leftmost Column with at Least a One
• 143. Reorder List
• 144. Binary Tree Preorder Traversal
• 1443. Minimum Time to Collect All Apples in a Tree
• 145. Binary Tree Postorder Traversal
• 146. LRU Cache
• 147. Insertion Sort List
• 1472. Design Browser History
• 148. Sort List
• 149. Max Points on a Line
• 15. 3Sum
• 151. Reverse Words in a String
• 1514. Path with Maximum Probability
• 152. Maximum Product Subarray
• 1522. Diameter of N‐Ary Tree
• 153. Find Minimum in Rotated Sorted Array
• 1539. Kth Missing Positive Number
• 154. Find Minimum in Rotated Sorted Array II
• 155. Min Stack
• 156. Binary Tree Upside Down
• 157. Read N Characters Given Read4
• 1570. Dot Product of Two Sparse Vectors
• 158. Read N Characters Given Read4 II Call multiple times
• 16. 3Sum Closest
• 160. Intersection of Two Linked Lists
• 1604. Alert Using Same Key Card Three or More Times in a One Hour Period
• 161. One Edit Distance
• 162. Find Peak Element
• 1626. Best Team With No Conflicts
• 163. Missing Ranges
• 1631. Path With Minimum Effort
• 164. Maximum Gap
• 1643. Kth Smallest Instructions
• 1644. Lowest Common Ancestor of a Binary Tree II
• 1650. Lowest Common Ancestor of a Binary Tree III
• 1665. Minimum Initial Energy to Finish Tasks
• 1674. Minimum Moves to Make Array Complementary
• 1675. Minimize Deviation in Array
• 168. Excel Sheet Column Title
• 1680. Concatenation of Consecutive Binary Numbers
• 1686. Stone Game VI
• 1690. Stone Game VII
• 17. Letter Combinations of a Phone Number
• 171. Excel Sheet Column Number
• 1712. Ways to Split Array Into Three Subarrays
• 1722. Minimize Hamming Distance After Swap Operations
• 1723. Find Minimum Time to Finish All Jobs
• 1727. Largest Submatrix With Rearrangements
• 173. Binary Search Tree Iterator
• 174. Dungeon Game
• 1755. Closest Subsequence Sum
• 1760. Minimum Limit of Balls in a Bag
• 1762. Buildings With an Ocean View
• 1775. Equal Sum Arrays With Minimum Number of Operations
• 1787. Make the XOR of All Segments Equal to Zero
• 179. Largest Number
• 1801. Number of Orders in the Backlog
• 1802. Maximum Value at a Given Index in a Bounded Array
• 1803. Count Pairs With XOR in a Range
• 1806. Minimum Number of Operations to Reinitialize a Permutation
• 1808. Maximize Number of Nice Divisors
• 1825. Finding MK Average
• 1838. Frequency of the Most Frequent Element
• 1839. Longest Substring Of All Vowels in Order
• 1840. Maximum Building Height
• 1850. Minimum Adjacent Swaps to Reach the Kth Smallest Number
• 1856. Maximum Subarray Min Product
• 186. Reverse Words in a String II
• 1866. Number of Ways to Rearrange Sticks With K Sticks Visible
• 1868. Product of Two Run‐Length Encoded Arrays
• 1871. Jump Game VII
• 188. Best Time to Buy and Sell Stock IV
• 1882. Process Tasks Using Servers
• 1888. Minimum Number of Flips to Make the Binary String Alternating
• 189. Rotate Array
• 1891. Cutting Ribbons
• 19. Remove Nth Node From End of List
• 1905. Count Sub Islands
• 191. Number of 1 Bits
• 1915. Number of Wonderful Substrings
• 1931. Painting a Grid With Three Different Colors
• 1937. Maximum Number of Points with Cost
• 198. House Robber
• 199. Binary Tree Right Side View
• 2. Add Two Numbers
• 20. Valid Parentheses
• 200. Number of Islands
• 201. Bitwise AND of Numbers Range
• 202. Happy Number
• 203. Remove Linked List Elements
• 204. Count Primes
• 205. Isomorphic Strings
• 206. Reverse Linked List
• 2060. Check if an Original String Exists Given Two Encoded Strings
• 207. Course Schedule
• 208. Implement Trie (Prefix Tree)
• 209. Minimum Size Subarray Sum
• 21. Merge Two Sorted Lists
• 210. Course Schedule II
• 211. Add and Search Word Data structure design
• 212. Word Search II
• 213. House Robber II
• 2133. Check if Every Row and Column Contains All Numbers
• 214. Shortest Palindrome
• 215. Kth Largest Element in an Array
• 216. Combination Sum III
• 218. The Skyline Problem
• 22. Generate Parentheses
• 221. Maximal Square
• 222. Count Complete Tree Nodes
• 223. Rectangle Area
• 224. Basic Calculator
• 2246. Longest Path With Different Adjacent Characters
• 225. Implement Stack using Queues
• 226. Invert Binary Tree
• 227. Basic Calculator II
• 2275. Largest Combination With Bitwise AND Greater Than Zero
• 2276. Count Integers in Intervals
• 228. Summary Ranges
• 23. Merge k Sorted Lists
• 230. Kth Smallest Element in a BST
• 232. Implement Queue using Stacks
• 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
• 239. Sliding Window Maximum
• 24. Swap Nodes in Pairs
• 240. Search a 2D Matrix II
• 241. Different Ways to Add Parentheses
• 242. Valid Anagram
• 243. Shortest Word Distance
• 244. Shortest Word Distance II
• 245. Shortest Word Distance III
• 246. Strobogrammatic Number
• 247. Strobogrammatic Number II
• 248. Strobogrammatic Number III
• 249. Group Shifted Strings
• 25. Reverse Nodes in k Group
• 250. Count Univalue Subtrees
• 251. Flatten 2D Vector
• 252. Meeting Rooms
• 253. Meeting Rooms II
• 254. Factor Combinations
• 255. Verify Preorder Sequence in Binary Search Tree
• 256. Paint House
• 257. Binary Tree Paths
• 26. Remove Duplicates from Sorted Array
• 261. Graph Valid Tree
• 263. Ugly Number
• 264. Ugly Number II
• 265. Paint House II
• 266. Palindrome Permutation
• 267. Palindrome Permutation II
• 269. Alien Dictionary
• 27. Remove Element
• 270. Closest Binary Search Tree Value
• 271. Encode and Decode Strings
• 272. Closest Binary Search Tree Value II
• 273. Integer to English Words
• 274. H Index
• 275. H Index II
• 276. Paint Fence
• 277. Find the Celebrity
• 278. First Bad Version
• 279. Perfect Squares
• 28. Implement strStr()
• 280. Wiggle Sort
• 281. Zigzag Iterator
• 282. Expression Add Operators
• 283. Move Zeroes
• 284. Peeking Iterator
• 285. Inorder Successor in BST
• 286. Walls and Gates
• 287. Find the Duplicate Number
• 288. Unique Word Abbreviation
• 289. Game of Life
• 29. Divide Two Integers
• 293. Flip Game
• 294. Flip Game II
• 295. Find Median from Data Stream
• 296. Best Meeting Point
• 297. Serialize and Deserialize Binary Tree
• 298. Binary Tree Longest Consecutive Sequence
• 299. Bulls and Cows
• 3. Longest Substring Without Repeating Characters
• 30. Substring with Concatenation of All Words
• 300. Longest Increasing Subsequence
• 301. Remove Invalid Parentheses
• 302. Smallest Rectangle Enclosing Black Pixels
• 303. Range Sum Query Immutable
• 304. Range Sum Query 2D Immutable
• 305. Number of Islands II
• 306. Additive Number
• 307. Range Sum Query Mutable
• 308. Range Sum Query 2D Mutable
• 309. Best Time to Buy and Sell Stock with Cooldown
• 31. Next Permutation
• 310. Minimum Height Trees
• 311. Sparse Matrix Multiplication
• 312. Burst Balloons
• 313. Super Ugly Number
• 314. Binary Tree Vertical Order Traversal
• 315. Count of Smaller Numbers After Self
• 316. Remove Duplicate Letters
• 317. Shortest Distance from All Buildings
• 318. Maximum Product of Word Lengths
• 32. Longest Valid Parentheses
• 320. Generalized Abbreviation
• 321. Create Maximum Number
• 322. Coin Change
• 323. Number of Connected Components in an Undirected Graph
• 324. Wiggle Sort II
• 325. Maximum Size Subarray Sum Equals k
• 327. Count of Range Sum
• 328. Odd Even Linked List
• 329. Longest Increasing Path in a Matrix
• 33. Search in Rotated Sorted Array
• 330. Patching Array
• 331. Verify Preorder Serialization of a Binary Tree
• 332. Reconstruct Itinerary
• 333. Largest BST Subtree
• 334. Increasing Triplet Subsequence
• 335. Self Crossing
• 336. Palindrome Pairs
• 337. House Robber III
• 338. Counting Bits
• 339. Nested List Weight Sum
• 34. Search for a Range
• 340. Longest Substring with At Most K Distinct Characters
• 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
• 35. Search Insert Position
• 350. Intersection of Two Arrays II
• 351. Android Unlock Patterns
• 352. Data Stream as Disjoint Intervals
• 353. Design Snake Game
• 354. Russian Doll Envelopes
• 355. Design Twitter
• 356. Line Reflection
• 357. Count Numbers with Unique Digits
• 358. Rearrange String k Distance Apart
• 359. Logger Rate Limiter
• 36. Valid Sudoku
• 360. Sort Transformed Array
• 361. Bomb Enemy
• 362. Design Hit Counter
• 363. Max Sum of Rectangle No Larger Than K
• 364. Nested List Weight Sum II
• 365. Water and Jug Problem
• 366. Find Leaves of Binary Tree
• 367. Valid Perfect Square
• 368. Largest Divisible Subset
• 369. Plus One Linked List
• 37. Sudoku Solver
• 370. Range Addition
• 371. Sum of Two Integers
• 372. Super Pow
• 373. Find K Pairs with Smallest Sums
• 374. Guess Number Higher or Lower
• 375. Guess Number Higher or Lower II
• 376. Wiggle Subsequence
• 377. Combination Sum IV
• 378. Kth Smallest Element in a Sorted Matrix
• 38. Count and Say
• 380. Insert Delete GetRandom O(1)
• 381. Insert Delete GetRandom O(1) Duplicates allowed
• 382. Linked List Random Node
• 384. Shuffle an Array
• 385. Mini Parser
• 388. Longest Absolute File Path
• 39. Combination Sum
• 392. Is Subsequence
• 394. Decode String
• 395. Longest Substring with At Least K Repeating Characters
• 398. Random Pick Index
• 399. Evaluate Division
• 4. Median of Two Sorted Arrays
• 40. Combination Sum II
• 404. Sum of Left Leaves
• 408. Valid Word Abbreviation
• 41. First Missing Positive
• 410. Split Array Largest Sum
• 413. Arithmetic Slices
• 416. Partition Equal Subset Sum
• 419. Battleships in a Board
• 42. Trapping Rain Water
• 423. Reconstruct Original Digits from English
• 426. Convert Binary Search Tree to Sorted Doubly Linked List
• 427. Construct Quad Tree
• 428. Serialize and Deserialize N ary Tree
• 43. Multiply Strings
• 438. Find All Anagrams in a String
• 44. Wildcard Matching
• 449. Serialize and Deserialize BST
• 45. Jump Game II
• 450. Delete Node in a BST
• 451. Sort Characters By Frequency
• 46. Permutations
• 460. LFU Cache
• 465. Optimal Account Balancing
• 468. Validate IP Address
• 47. Permutations II
• 470. Implement Rand10() Using Rand7()
• 472. Concatenated Words
• 473. Matchsticks to Square
• 478. Generate Random Point in a Circle
• 48. Rotate Image
• 489. Robot Room Cleaner
• 49. Group Anagrams
• 490. The Maze
• 493. Reverse Pairs
• 494. Target Sum
• 498. Diagonal Traverse
• 499. The Maze III
• 5. Longest Palindromic Substring
• 50. Pow(x, n)
• 505. The Maze II
• 51. N Queens
• 518. Coin Change 2
• 52. N Queens II
• 523. Continuous Subarray Sum
• 528. Random Pick with Weight
• 529. Minesweeper
• 53. Maximum Subarray
• 532. K diff Pairs in an Array
• 536. Construct Binary Tree from String
• 54. Spiral Matrix
• 542. 01 Matrix
• 543. Diameter of Binary Tree
• 56. Merge Intervals
• 560. Subarray Sum Equals K
• 568. Maximum Vacation Days
• 57. Insert Interval
• 572. Subtree of Another Tree
• 588. Design In Memory File System
• 59. Spiral Matrix II
• 60. Permutation Sequence
• 609. Find Duplicate File in System
• 61. Rotate List
• 62. Unique Paths
• 621. Task Scheduler
• 63. Unique Paths II
• 631. Design Excel Sum Formula
• 636. Exclusive Time of Functions
• 64. Minimum Path Sum
• 642. Design Search Autocomplete System
• 646. Maximum Length of Pair Chain
• 65. Valid Number
• 67. Add Binary
• 670. Maximum Swap
• 675. Cut Off Trees for Golf Event
• 68. Text Justification
• 680. Valid Palindrome II
• 688. Knight Probability in Chessboard
• 69. Sqrt(x)
• 691. Stickers to Spell Word
• 692. Top K Frequent Words
• 694. Number of Distinct Islands
• 698. Partition to K Equal Sum Subsets
• 70. Climbing Stairs
• 708. Insert into a Sorted Circular Linked List
• 71. Simplify Path
• 712. Minimum ASCII Delete Sum for Two Strings
• 714. Best Time to Buy and Sell Stock with Transaction Fee
• 718. Maximum Length of Repeated Subarray
• 72. Edit Distance
• 721. Accounts Merge
• 73. Set Matrix Zeroes
• 731. My Calendar II
• 732. My Calendar III
• 733. Flood Fill
• 735. Asteroid Collision
• 739. Daily Temperatures
• 74. Search a 2D Matrix
• 743. Network Delay Time
• 75. Sort Colors
• 750. Number Of Corner Rectangles
• 751. IP to CIDR
• 755. Pour Water
• 759. Employee Free Time
• 76. Minimum Window Substring
• 766. Toeplitz Matrix
• 767. Reorganize String
• 77. Combinations
• 772. Basic Calculator III
• 777. Swap Adjacent in LR String
• 78. Subsets
• 785. Is Graph Bipartite?
• 787. Cheapest Flights Within K Stops
• 79. Word Search
• 791. Custom Sort String
• 797. All Paths From Source to Target
• 8. String to Integer (atoi)
• 81. Search in Rotated Sorted Array II
• 815. Bus Routes
• 82. Remove Duplicates from Sorted List II
• 827. Making A Large Island
• 829. Consecutive Numbers Sum
• 83. Remove Duplicates from Sorted List
• 839. Similar String Groups
• 84. Largest Rectangle in Histogram
• 843. Guess the Word
• 847. Shortest Path Visiting All Nodes
• 85. Maximal Rectangle
• 854. K Similar Strings
• 86. Partition List
• 863. All Nodes Distance K in Binary Tree
• 864. Shortest Path to Get All Keys
• 87. Scramble String
• 872. Leaf‐Similar Trees
• 877. Stone Game
• 88. Merge Sorted Array
• 885. Spiral Matrix III
• 886. Possible Bipartition
• 895. Maximum Frequency Stack
• 90. Subsets II
• 907. Sum of Subarray Minimums
• 91. Decode Ways
• 917. Reverse Only Letters
• 92. Reverse Linked List II
• 921. Minimum Add to Make Parentheses Valid
• 923. 3Sum With Multiplicity
• 93. Restore IP Addresses
• 938. Range Sum of BST
• 94. Binary Tree Inorder Traversal
• 945. Minimum Increment to Make Array Unique
• 95. Unique Binary Search Trees II
• 953. Verifying an Alien Dictionary
• 958. Check Completeness of a Binary Tree
• 959. Regions Cut By Slashes
• 96. Unique Binary Search Trees
• 97. Interleaving String
• 973. K Closest Points to Origin
• 98. Validate Binary Search Tree
• 981. Time Based Key Value Store
• 986. Interval List Intersections
• 987. Vertical Order Traversal of a Binary Tree
• 99. Recover Binary Search Tree
• Array & string
• BFS Shortest Path Template
• Binary Index Tree
• Binary search
• Binary search (bug)
• Bit wise
• Bitwise operation
• Concurrency
• Cycle detection in directed graph
• Data Structure: Binary Index Tree
• Data Structure: Union Find
• Design
• DFS & BFS
• Divide and Conquer
• Dynamic programming
• English
• Find out repeated number in array
• Graph
• Greedy
• Heuristic
• Josephus problem (count out)
• LC 319: Bulb Switcher
• Line Sweep
• Linked list
• Logical and Maintainable
• Math
• merge sort
• Preface
• Python Notes
• quick sort
• Random and Sampling
• Sort
• Stack and Queue
• Terms
• tree
• TreeMap
• Trie
• Two pointers
• Union find