Introduction
Easy
1. Two Sum(easy)
9. Palindrome Number(easy)
20. Valid Parentheses(easy)
88. Merge Sorted Array(easy)
119. Pascal's Triangle II(easy)
160. Intersection of Two Linked Lists(easy)
191. Number of 1 Bits(easy)
225. Implement Stack using Queues(easy)
268. Missing Number(easy)
344. Reverse String(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)
812. Largest Triangle Area(easy)
844. Backspace String Compare(easy)
867. Transpose Matrix(easy)
897. Increasing Order Search Tree(easy)
905. Sort Array By Parity(easy)
976. Largest Perimeter Triangle(easy)
1046. Last Stone Weight(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)
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)
1935. Maximum Number of Words You Can Type(easy)
2418. Sort the People(easy)
3005. Count Elements With Maximum Frequency(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)
11. Container With Most Water(medium)
17. Letter Combinations of a Phone Number(medium)
29. Divide Two Integers(medium)
31. Next Permutation(medium)
46. Permutations(medium)
47. Permutations II(medium)
59. Spiral Matrix II(medium)
61. Rotate List(medium)
63. Unique Paths II(medium)
74. Search a 2D Matrix(medium)
81. Search in Rotated Sorted Array II(medium)
99. Recover Binary Search Tree(medium)
117. Populating Next Right Pointers in Each Node II(medium)
120. Triangle(medium)
128. Longest Consecutive Sequence(medium)
138. Copy List with Random Pointer(medium)
152. Maximum Product Subarray(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)
215. Kth Largest Element in an Array(medium)
216. Combination Sum III(medium)
230. Kth Smallest Element in a BST(medium)
284. Peeking Iterator(medium)
287. Find the Duplicate Number(medium)
289. Game of Life(medium)
304. Range Sum Query 2D - Immutable(medium)
318. Maximum Product of Word Lengths(medium)
322. Coin Change(medium)
341. Flatten Nested List Iterator(medium)
347. Top K Frequent Elements(medium)
376. Wiggle Subsequence(medium)
399. Evaluate Division(medium)
406. Queue Reconstruction by Height(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)
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)
665. Non-decreasing Array(medium)
669. Trim a Binary Search Tree(medium)
769. Max Chunks To Make Sorted(medium)
785. Is Graph Bipartite?(medium)
820. Short Encoding of Words(medium)
826. Most Profit Assigning Work(medium)
912. Sort an Array(medium)
923. 3Sum With Multiplicity(medium)
966. Vowel Spellchecker(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)
1190. Reverse Substrings Between Each Pair of Parentheses(medium)
1202. Smallest String With Swaps(medium)
1209. Remove All Adjacent Duplicates in String II(medium)
1268. Search Suggestions System(medium)
1302. Deepest Leaves Sum(medium)
1352. Product of the Last K Numbers(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)
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)
1530. Number of Good Leaf Nodes Pairs(medium)
1552. Magnetic Force Between Two Balls(medium)
1584. Min Cost to Connect All Points(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)
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)
2096. Step-By-Step Directions From a Binary Tree Node to Another(medium)
2191. Sort the Jumbled Numbers(medium)
2196. Create Binary Tree From Descriptions(medium)
2221. Find Triangular Sum of an Array(medium)
2327. Number of People Aware of a Secret(medium)
2353. Design a Food Rating System(medium)
2415. Reverse Odd Levels of Binary Tree(medium)
2471. Minimum Number of Operations to Sort a Binary Tree by Level(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)
3227. Vowels Game in a String(medium)
3264. Final Array State After K Multiplication Operations I(easy)
3408. Design Task Manager(medium)
3484. Design Spreadsheet(medium)
3508. Implement Router(medium)
Hard
32. Longest Valid Parentheses(hard)
51. N-Queens(hard)
52. N-Queens II(hard)
135. Candy(hard)
329. Longest Increasing Path in a Matrix(hard)
330. Patching Array(hard)
354. Russian Doll Envelopes(hard)
410. Split Array Largest Sum(hard)
726. Number of Atoms(hard)
968. Binary Tree Cameras(hard)
1192. Critical Connections in a Network(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)
3495. Minimum Operations to Make Array Elements Zero(hard)
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