Introduction
Easy
1. Two Sum(easy)
9. Palindrome Number(easy)
14. Longest Common Prefix(easy)
20. Valid Parentheses(easy)
21. Merge Two Sorted Lists(easy)
26. Remove Duplicates from Sorted Array(easy)
27. Remove Element(easy)
28. Find the Index of the First Occurrence in a String(easy)
35. Search Insert Position(easy)
58. Length of Last Word(easy)
66. Plus One(easy)
67. Add Binary(easy)
69. Sqrt(x)(easy)
70. Climbing Stairs(easy)
83. Remove Duplicates from Sorted List(easy)
88. Merge Sorted Array(easy)
101. Symmetric Tree(easy)
104. Maximum Depth of Binary Tree(easy)
108. Convert Sorted Array to Binary Search Tree(easy)
118. Pascal's Triangle(easy)
119. Pascal's Triangle II(easy)
121. Best Time to Buy and Sell Stock(easy)
136. Single Number(easy)
141. Linked List Cycle(easy)
160. Intersection of Two Linked Lists(easy)
169. Majority Element(easy)
191. Number of 1 Bits(easy)
206. Reverse Linked List(easy)
225. Implement Stack using Queues(easy)
226. Invert Binary Tree(easy)
234. Palindrome Linked List(easy)
268. Missing Number(easy)
283. Move Zeroes(easy)
344. Reverse String(easy)
345. Reverse Vowels of a String(easy)
374. Guess Number Higher or Lower(easy)
392. Is Subsequence(easy)
543. Diameter of Binary Tree(easy)
605. Can Place Flowers(easy)
643. Maximum Average Subarray I(easy)
680. Valid Palindrome II(easy)
682. Baseball Game(easy)
700. Search in a Binary Search Tree(easy)
703. Kth Largest Element in a Stream(easy)
704. Binary Search(easy)
705. Design HashSet(easy)
706. Design HashMap(easy)
717. 1-bit and 2-bit Characters(easy)
724. Find Pivot Index(easy)
746. Min Cost Climbing Stairs(easy)
812. Largest Triangle Area(easy)
844. Backspace String Compare(easy)
867. Transpose Matrix(easy)
872. Leaf-Similar Trees(easy)
897. Increasing Order Search Tree(easy)
905. Sort Array By Parity(easy)
933. Number of Recent Calls(easy)
976. Largest Perimeter Triangle(easy)
1009. Complement of Base 10 Integer(easy)
1018. Binary Prefix Divisible By 5(easy)
1046. Last Stone Weight(easy)
1047. Remove All Adjacent Duplicates In String(easy)
1071. Greatest Common Divisor of Strings(easy)
1137. N-th Tribonacci Number(easy)
1207. Unique Number of Occurrences(easy)
1260. Shift 2D Grid(easy)
1304. Find N Unique Integers Sum up to Zero(easy)
1317. Convert Integer to the Sum of Two No-Zero Integers(easy)
1332. Remove Palindromic Subsequences(easy)
1337. The K Weakest Rows in a Matrix(easy)
1342. Number of Steps to Reduce a Number to Zero(easy)
1380. Lucky Numbers in a Matrix(easy)
1431. Kids With the Greatest Number of Candies(easy)
1437. Check If All 1's Are at Least Length K Places Away(easy)
1475. Final Prices With a Special Discount in a Shop(easy)
1518. Water Bottles(easy)
1598. Crawler Log Folder(easy)
1636. Sort Array by Increasing Frequency(easy)
1710. Maximum Units on a Truck(easy)
1716. Calculate Money in Leetcode Bank(easy)
1732. Find the Highest Altitude(easy)
1768. Merge Strings Alternately(easy)
1935. Maximum Number of Words You Can Type(easy)
2011. Final Value of Variable After Performing Operations(easy)
2154. Keep Multiplying Found Values by Two(easy)
2169. Count Operations to Obtain Zero(easy)
2215. Find the Difference of Two Arrays(easy)
2273. Find Resultant Array After Removing Anagrams(easy)
2418. Sort the People(easy)
3005. Count Elements With Maximum Frequency(easy)
3190. Find Minimum Operations to Make All Elements Divisible by Three(easy)
3289. The Two Sneaky Numbers of Digitville(easy)
3318. Find X-Sum of All K-Long Subarrays I(easy)
3349. Adjacent Increasing Subarrays Detection I(easy)
3354. Make Array Elements Equal to Zero(easy)
3370. Smallest Number With All Set Bits(easy)
3461. Check If Digits Are Equal in String After Operations I(easy)
3512. Minimum Operations to Make Array Sum Divisible by K(easy)
3516. Find Closest Person(easy)
3541. Find Most Frequent Vowel and Consonant(easy)
Medium
2. Add Two Numbers
3. Longest Substring Without Repeating Characters(medium)
5. Longest Palindromic Substring(medium)
6. Zigzag Conversion(medium)
7. Reverse Integer(medium)
8. String to Integer (atoi)(medium)
11. Container With Most Water(medium)
12. Integer to Roman(medium)
15. 3Sum(medium)
16. 3Sum Closest(medium)
17. Letter Combinations of a Phone Number(medium)
18. 4Sum(medium)
19. Remove Nth Node From End of List(medium)
22. Generate Parentheses(medium)
24. Swap Nodes in Pairs(medium)
29. Divide Two Integers(medium)
31. Next Permutation(medium)
33. Search in Rotated Sorted Array(medium)
34. Find First and Last Position of Element in Sorted Array(medium)
36. Valid Sudoku(medium)
39. Combination Sum(medium)
40. Combination Sum II(medium)
43. Multiply Strings(medium)
45. Jump Game II(medium)
46. Permutations(medium)
47. Permutations II(medium)
48. Rotate Image(medium)
49. Group Anagrams(medium)
50. Pow(x, n)(medium)
53. Maximum Subarray(medium)
54. Spiral Matrix(medium)
55. Jump Game(medium)
56. Merge Intervals(medium)
57. Insert Interval(medium)
59. Spiral Matrix II(medium)
61. Rotate List(medium)
62. Unique Paths(medium)
63. Unique Paths II(medium)
64. Minimum Path Sum(medium)
71. Simplify Path(medium)
72. Edit Distance(medium)
73. Set Matrix Zeroes(medium)
74. Search a 2D Matrix(medium)
75. Sort Colors(medium)
77. Combinations(medium)
78. Subsets(medium)
81. Search in Rotated Sorted Array II(medium)
86. Partition List(medium)
89. Gray Code(medium)
90. Subsets II(medium)
91. Decode Ways(medium)
92. Reverse Linked List II(medium)
93. Restore IP Addresses(medium)
98. Validate Binary Search Tree(medium)
99. Recover Binary Search Tree(medium)
102. Binary Tree Level Order Traversal(medium)
105. Construct Binary Tree from Preorder and Inorder Traversal(medium)
114. Flatten Binary Tree to Linked List(medium)
117. Populating Next Right Pointers in Each Node II(medium)
120. Triangle(medium)
128. Longest Consecutive Sequence(medium)
131. Palindrome Partitioning(medium)
138. Copy List with Random Pointer(medium)
139. Word Break(medium)
142. Linked List Cycle II(medium)
143. Reorder List(medium)
146. LRU Cache(medium)
151. Reverse Words in a String(medium)
152. Maximum Product Subarray(medium)
153. Find Minimum in Rotated Sorted Array(medium)
155. Min Stack(medium)
162. Find Peak Element(medium)
165. Compare Version Numbers(medium)
166. Fraction to Recurring Decimal(medium)
167. Two Sum II - Input Array Is Sorted(medium)
173. Binary Search Tree Iterator(medium)
189. Rotate Array(medium)
198. House Robber(medium)
199. Binary Tree Right Side View(medium)
200. Number of Islands(medium)
207. Course Schedule(medium)
208. Implement Trie (Prefix Tree)(medium)
215. Kth Largest Element in an Array(medium)
216. Combination Sum III(medium)
230. Kth Smallest Element in a BST(medium)
236. Lowest Common Ancestor of a Binary Tree(medium)
238. Product of Array Except Self(medium)
240. Search a 2D Matrix II(medium)
279. Perfect Squares(medium)
284. Peeking Iterator(medium)
287. Find the Duplicate Number(medium)
289. Game of Life(medium)
300. Longest Increasing Subsequence(medium)
304. Range Sum Query 2D - Immutable(medium)
316. Remove Duplicate Letters(medium)
318. Maximum Product of Word Lengths(medium)
322. Coin Change(medium)
328. Odd Even Linked List(medium)
334. Increasing Triplet Subsequence(medium)
341. Flatten Nested List Iterator(medium)
347. Top K Frequent Elements(medium)
376. Wiggle Subsequence(medium)
394. Decode String(medium)
399. Evaluate Division(medium)
406. Queue Reconstruction by Height(medium)
416. Partition Equal Subset Sum(medium)
417. Pacific Atlantic Water Flow(medium)
429. N-ary Tree Level Order Traversal(medium)
435. Non-overlapping Intervals(medium)
437. Path Sum III(medium)
438. Find All Anagrams in a String(medium)
443. String Compression(medium)
450. Delete Node in a BST(medium)
452. Minimum Number of Arrows to Burst Balloons(medium)
456. 132 Pattern(medium)
462. Minimum Moves to Equal Array Elements II(medium)
474. Ones and Zeroes(medium)
535. Encode and Decode TinyURL(medium)
538. Convert BST to Greater Tree(medium)
547. Number of Provinces(medium)
560. Subarray Sum Equals K(medium)
581. Shortest Unsorted Continuous Subarray(medium)
583. Delete Operation for Two Strings(medium)
611. Valid Triangle Number(medium)
633. Sum of Square Numbers(medium)
647. Palindromic Substrings(medium)
649. Dota2 Senate(medium)
665. Non-decreasing Array(medium)
669. Trim a Binary Search Tree(medium)
714. Best Time to Buy and Sell Stock with Transaction Fee(medium)
735. Asteroid Collision(medium)
739. Daily Temperatures(medium)
763. Partition Labels(medium)
769. Max Chunks To Make Sorted(medium)
785. Is Graph Bipartite?(medium)
790. Domino and Tromino Tiling(medium)
820. Short Encoding of Words(medium)
826. Most Profit Assigning Work(medium)
875. Koko Eating Bananas(medium)
901. Online Stock Span(medium)
912. Sort an Array(medium)
923. 3Sum With Multiplicity(medium)
966. Vowel Spellchecker(medium)
994. Rotting Oranges(medium)
1004. Max Consecutive Ones III(medium)
1015. Smallest Integer Divisible by K(medium)
1029. Two City Scheduling(medium)
1039. Minimum Score Triangulation of Polygon(medium)
1048. Longest String Chain(medium)
1052. Grumpy Bookstore Owner(medium)
1091. Shortest Path in Binary Matrix(medium)
1110. Delete Nodes And Return Forest(medium)
1143. Longest Common Subsequence(medium)
1161. Maximum Level Sum of a Binary Tree(medium)
1190. Reverse Substrings Between Each Pair of Parentheses(medium)
1202. Smallest String With Swaps(medium)
1209. Remove All Adjacent Duplicates in String II(medium)
1262. Greatest Sum Divisible by Three(medium)
1268. Search Suggestions System(medium)
1302. Deepest Leaves Sum(medium)
1318. Minimum Flips to Make a OR b Equal to c(medium)
1352. Product of the Last K Numbers(medium)
1372. Longest ZigZag Path in a Binary Tree(medium)
1379. Find a Corresponding Node of a Binary Tree in a Clone of That Tree(medium)
1396. Design Underground System(medium)
1423. Maximum Points You Can Obtain from Cards(medium)
1448. Count Good Nodes in Binary Tree(medium)
1456. Maximum Number of Vowels in a Substring of Given Length(medium)
1461. Check If a String Contains All Binary Codes of Size K(medium)
1465. Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts(medium)
1482. Minimum Number of Days to Make m Bouquets(medium)
1488. Avoid Flood in The City(medium)
1493. Longest Subarray of 1's After Deleting One Element(medium)
1513. Number of Substrings With Only 1s(medium)
1530. Number of Good Leaf Nodes Pairs(medium)
1552. Magnetic Force Between Two Balls(medium)
1578. Minimum Time to Make Rope Colorful(medium)
1584. Min Cost to Connect All Points(medium)
1625. Lexicographically Smallest String After Applying Operations(medium)
1631. Path With Minimum Effort(medium)
1641. Count Sorted Vowel Strings(medium)
1642. Furthest Building You Can Reach(medium)
1653. Minimum Deletions to Make String Balanced(medium)
1657. Determine if Two Strings Are Close(medium)
1658. Minimum Operations to Reduce X to Zero(medium)
1679. Max Number of K-Sum Pairs(medium)
1689. Partitioning Into Minimum Number Of Deci-Binary Numbers(medium)
1695. Maximum Erasure Value(medium)
1717. Maximum Score From Removing Substrings(medium)
1721. Swapping Nodes in a Linked List(medium)
1733. Minimum Number of People to Teach(medium)
1926. Nearest Exit from Entrance in Maze(medium)
1930. Unique Length-3 Palindromic Subsequences(medium)
2043. Simple Bank System(medium)
2048. Next Greater Numerically Balanced Number(medium)
2095. Delete the Middle Node of a Linked List(medium)
2096. Step-By-Step Directions From a Binary Tree Node to Another(medium)
2125. Number of Laser Beams in a Bank(medium)
2130. Maximum Twin Sum of a Linked List(medium)
2191. Sort the Jumbled Numbers(medium)
2196. Create Binary Tree From Descriptions(medium)
2221. Find Triangular Sum of an Array(medium)
2257. Count Unguarded Cells in the Grid(medium)
2300. Successful Pairs of Spells and Potions(medium)
2327. Number of People Aware of a Secret(medium)
2336. Smallest Number in Infinite Set(medium)
2352. Equal Row and Column Pairs(medium)
2353. Design a Food Rating System(medium)
2390. Removing Stars From a String(medium)
2415. Reverse Odd Levels of Binary Tree(medium)
2462. Total Cost to Hire K Workers(medium)
2471. Minimum Number of Operations to Sort a Binary Tree by Level(medium)
2536. Increment Submatrices by One(medium)
2542. Maximum Subsequence Score(medium)
2598. Smallest Missing Non-negative Integer After Operations(medium)
2636. Promise Pool(medium)
2654. Minimum Number of Operations to Make All Array Elements Equal to 1(medium)
2749. Minimum Operations to Make the Integer Zero(medium)
2785. Sort Vowels in a String(medium)
3025. Find the Number of Ways to Place People I(medium)
3100. Water Bottles II(medium)
3147. Taking Maximum Energy From the Mystic Dungeon(medium)
3186. Maximum Total Damage With Spell Casting(medium)
3217. Delete Nodes From Linked List Present in Array(medium)
3227. Vowels Game in a String(medium)
3228. Maximum Number of Operations to Move Ones to the End(medium)
3264. Final Array State After K Multiplication Operations I(easy)
3346. Maximum Frequency of an Element After Performing Operations I(medium)
3350. Adjacent Increasing Subarrays Detection II(medium)
3381. Maximum Subarray Sum With Length Divisible by K(medium)
3397. Maximum Number of Distinct Elements After Operations(medium)
3408. Design Task Manager(medium)
3484. Design Spreadsheet(medium)
3508. Implement Router(medium)
3542. Minimum Operations to Convert All Elements to Zero(medium)
3607. Power Grid Maintenance(medium)
Hard
23. Merge k Sorted Lists(hard)
25. Reverse Nodes in k-Group(hard)
32. Longest Valid Parentheses(hard)
41. First Missing Positive(hard)
42. Trapping Rain Water(hard)
51. N-Queens(hard)
52. N-Queens II(hard)
76. Minimum Window Substring(hard)
84. Largest Rectangle in Histogram(hard)
124. Binary Tree Maximum Path Sum(hard)
135. Candy(hard)
239. Sliding Window Maximum(hard)
295. Find Median from Data Stream(hard)
329. Longest Increasing Path in a Matrix(hard)
330. Patching Array(hard)
354. Russian Doll Envelopes(hard)
407. Trapping Rain Water II(hard)
410. Split Array Largest Sum(hard)
726. Number of Atoms(hard)
778. Swim in Rising Water(hard)
968. Binary Tree Cameras(hard)
1192. Critical Connections in a Network(hard)
1526. Minimum Number of Increments on Subarrays to Form a Target Array(hard)
1912. Design Movie Rental System(hard)
2197. Replace Non-Coprime Numbers in Array(hard)
2751. Robot Collisions(hard)
2872. Maximum Number of K-Divisible Components(hard)
3027. Find the Number of Ways to Place People II(hard)
3347. Maximum Frequency of an Element After Performing Operations II(hard)
3495. Minimum Operations to Make Array Elements Zero(hard)
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