leetcodeStudyGroup

This is a repository for leetcode study group.

Problem Pool

• 264. Ugly Number II [link]
• 328. Odd Even Linked List [link]
• 611. Valid Triangle Number [link]
• 662. Maximum Width of Binary Tree [link]
• 394. Decode String [link]
• 655. Print Binary Tree [link]
• 498. Diagonal Traverse [link]
• 537. Complex Number Multiplication [link]
• 260. Single Number III [link]
• 310. Minimum Height Trees [link]

You can try it

• 44. Wildcard Matching [link]
• 282. Expression Add Operators [link]

Week 1

• 134. Gas Station [link]
• 165. Compare Version Numbers [link]

Week 2

• 16. 3Sum Closest [link]
• 229. Majority Element II [link]

Week 3

• 127. Word Ladder [link]
• 223. Rectangle Area [link]

Week 4

• 324. Wiggle Sort II [link]
• 221. Maximal Square [link]

Week 5

• 95. Unique Binary Search Trees II [link]
• 19. Remove Nth Node From End of List [link]

Week 6

• 93. Restore IP Addresses [link]
• 396. Rotate Function [link]

Week 7

• 102. Binary Tree Level Order Traversal [link]
• 525. Contiguous Array [link]

Week 8

• 147. Insertion Sort List [link]
• 17. Letter Combinations of a Phone Number [link]

Week 9

• 200. Number of Islands [link]
• 390. Elimination Game [link]

Week 10

• 207. Course Schedule [link]
• 377. Combination Sum IV [link]

Week 11

• 474. Ones and Zeroes [link]
• 228. Summary Ranges [link]

Week 12

• 319. Bulb Switcher [link]
• 78. Subsets [link]

Week 13

• 338. Counting Bits [link]
• 142. Linked List Cycle II [link]

Week 14

• 365. Water and Jug Problem [link]
• 89. Gray Code [link]

Week 15

• 331. Verify Preorder Serialization of a Binary Tree [link]
• 419. Battleships in a Board [link]

Week 16

• 36. Valid Sudoku [link]
• 378. Kth Smallest Element in a Sorted Matrix [link]

Week 17

• 452. Minimum Number of Arrows to Burst Balloons [link]
• 109. Convert Sorted List to Binary Search Tree [link]

Week 18

• 236. Lowest Common Ancestor of a Binary Tree [link]
• 467. Unique Substrings in Wraparound String [link]

Week 19

• 133. Clone Graph [link]
• 284. Peeking Iterator [link]

Week 20

• 279. Perfect Squares [link]
• 114. Flatten Binary Tree to Linked List [link]

Week 21

• 313. Super Ugly Number [link]
• 98. Validate Binary Search Tree [link]

Week 22

• 380. Insert Delete GetRandom O(1) [link]
• 592. Fraction Addition and Subtraction [link]

Week 23

• 357. Count Numbers with Unique Digits [link]
• 187. Repeated DNA Sequences [link]

Week 24

• 299. Bulls and Cows [link]
• 513. Find Bottom Left Tree Value [link]

Week 25

• 468. Validate IP Address [link]
• 526. Beautiful Arrangement [link]

Week 26

• 406. Queue Reconstruction by Height [link]
• 395. Longest Substring with At Least K Repeating Characters [link]

Week 27

• 287. Find the Duplicate Number [link]
• 435. Non-overlapping Intervals [link]

Week 28

• 120. Triangle [link]
• 398. Random Pick Index [link]

Week 29

• 393. UTF-8 Validation [link]
• 388. Longest Absolute File Path [link]

Week 30

• 150. Evaluate Reverse Polish Notation [link]
• 230. Kth Smallest Element in a BST [link]

Week 31

• 105. Construct Binary Tree from Preorder and Inorder Traversal [link]
• 113. Path Sum II [link]

Week 32

• 454. 4Sum II [link]
• 554. Brick Wall [link]

Week 33

• 529. Minesweeper [link]
• 46. Permutations [link]

Week 34

• 667. Beautiful Arrangement II [link]
• 648. Replace Words [link]

Week 35

• 433. Minimum Genetic Mutation [link]
• 274. H-Index [link]

Week 36

• 421. Maximum XOR of Two Numbers in an Array [link]
• 355. Design Twitter [link]

Week 37

• 131. Palindrome Partitioning [link]
• 413. Arithmetic Slices [link]

Week 38

• 263. Ugly Number [link]
• 91. Decode Ways [link]

Week 39

• 208. Implement Trie (Prefix Tree) [link]
• 621. Task Scheduler [link]

Week 40

• 39. Combination Sum [link]
• 495. Teemo Attacking [link]

Week 41

• 216. Combination Sum III [link]
• 54. Spiral Matrix [link]

Week 42

• 86. Partition List [link]
• 240. Search a 2D Matrix II [link]

Week 43

• 210. Course Schedule II [link]
• 241. Different Ways to Add Parentheses [link]

Week 44

• 392. Is Subsequence [link]
• 306. Additive Number [link]