- 1. Two Sum
- 9. Palindrome Number
- 13. Roman to Integer
- 14. Longest Common Prefix
- 20. Valid Parentheses
- 21. Merge Two Sorted Lists
- 26. Remove Duplicates from Sorted Array
- 27. Remove Element
- 28. Find the Index of the First Occurrence in a String
- 35. Search Insert Position
- 58. Length of Last Word
- 66. Plus One
- 67. Add Binary
- 69. Sqrt(x)
- 70. Climbing Stairs
- 83. Remove Duplicates from Sorted List
- 88. Merge Sorted Array
- 100. Same Tree
- 101. Symmetric Tree
- 104. Maximum Depth of Binary Tree
- 111. Minimum Depth of Binary Tree
- 112. Path Sum
- 118. Pascal's Triangle
- 119. Pascal's Triangle II
- 121. Best Time to Buy and Sell Stock
- 125. Valid Palindrome
- 136. Single Number
- 141. Linked List Cycle
- 168. Excel Sheet Column Title
- 169. Majority Element
- 171. Excel Sheet Column Number
- 190. Reverse Bits
- 191. Number of 1 Bits
- 202. Happy Number
- 203. Remove Linked List Elements
- 205. Isomorphic Strings
- 206. Reverse Linked List
- 217. Contains Duplicate
- 226. Invert Binary Tree
- 228. Summary Ranges
- 231. Power of Two
- 242. Valid Anagram
- 258. Add Digits
- 263. Ugly Number
- 268. Missing Number
- 278. First Bad Version
- 283. Move Zeroes
- 290. Word Pattern
- 303. Range Sum Query - Immutable
- 326. Power of Three
- 338. Counting Bits
- 342. Power of Four
- 344. Reverse String
- 345. Reverse Vowels of a String
- 383. Ransom Note
- 392. Is Subsequence
- 409. Longest Palindrome
- 412. Fizz Buzz
- 459. Repeated Substring Pattern
- 501. Find Mode in Binary Search Tree
- 509. Fibonacci Number
- 530. Minimum Absolute Difference in BST
- 557. Reverse Words in a String III
- 589. N-ary Tree Preorder Traversal
- 605. Can Place Flowers
- 617. Merge Two Binary Trees
- 643. Maximum Average Subarray I
- 703. Kth Largest Element in a Stream
- 704. Binary Search
- 705. Design HashSet
- 706. Design HashMap
- 709. To Lower Case
- 724. Find Pivot Index
- 733. Flood Fill
- 744. Find Smallest Letter Greater Than Target
- 746. Min Cost Climbing Stairs
- 771. Jewels and Stones
- 783. Minimum Distance Between BST Nodes
- 804. Unique Morse Code Words
- 832. Flipping an Image
- 844. Backspace String Compare
- 859. Buddy Strings
- 876. Middle of the Linked List
- 896. Monotonic Array
- 905. Sort Array By Parity
- 933. Number of Recent Calls
- 938. Range Sum of BST
- 953. Verifying an Alien Dictionary
- 977. Squares of a Sorted Array
- 989. Add to Array-Form of Integer
- 1021. Remove Outermost Parentheses
- 1046. Last Stone Weight
- 1051. Height Checker
- 1071. Greatest Common Divisor of Strings
- 1108. Defanging an IP Address
- 1137. N-th Tribonacci Number
- 1207. Unique Number of Occurrences
- 1221. Split a String in Balanced Strings
- 1232. Check If It Is a Straight Line
- 1281. Subtract the Product and Sum of Digits of an Integer
- 1290. Convert Binary Number in a Linked List to Integer
- 1309. Decrypt String from Alphabet to Integer Mapping
- 1313. Decompress Run-Length Encoded List
- 1323. Maximum 69 Number
- 1337. The K Weakest Rows in a Matrix
- 1342. Number of Steps to Reduce a Number to Zero
- 1351. Count Negative Numbers in a Sorted Matrix
- 1356. Sort Integers by The Number of 1 Bits
- 1365. How Many Numbers Are Smaller Than the Current Number
- 1389. Create Target Array in the Given Order
- 1431. Kids With the Greatest Number of Candies
- 1464. Maximum Product of Two Elements in an Array
- 1470. Shuffle the Array
- 1480. Running Sum of 1d Array
- 1486. XOR Operation in an Array
- 1491. Average Salary Excluding the Minimum and Maximum Salary
- 1502. Can Make Arithmetic Progression From Sequence
- 1512. Number of Good Pairs
- 1523. Count Odd Numbers in an Interval Range
- 1528. Shuffle String
- 1539. Kth Missing Positive Number
- 1572. Matrix Diagonal Sum
- 1603. Design Parking System
- 1614. Maximum Nesting Depth of the Parentheses
- 1672. Richest Customer Wealth
- 1678. Goal Parser Interpretation
- 1684. Count the Number of Consistent Strings
- 1688. Count of Matches in Tournament
- 1720. Decode XORed Array
- 1725. Number Of Rectangles That Can Form The Largest Square
- 1732. Find the Highest Altitude
- 1768. Merge Strings Alternately
- 1791. Find Center of Star Graph
- 1816. Truncate Sentence
- 1822. Sign of the Product of an Array
- 1827. Minimum Operations to Make the Array Increasing
- 1832. Check if the Sentence Is Pangram
- 1837. Sum of Digits in Base K
- 1844. Replace All Digits with Characters
- 1859. Sorting the Sentence
- 1913. Maximum Product Difference Between Two Pairs
- 1920. Build Array from Permutation
- 1929. Concatenation of Array
- 1967. Number of Strings That Appear as Substrings in Word
- 2000. Reverse Prefix of Word
- 2006. Count Number of Pairs With Absolute Difference K
- 2011. Final Value of Variable After Performing Operations
- 2103. Rings and Rods
- 2114. Maximum Number of Words Found in Sentences
- 2160. Minimum Sum of Four Digit Number After Splitting Digits
- 2176. Count Equal and Divisible Pairs in an Array
- 2185. Counting Words With a Given Prefix
- 2194. Cells in a Range on an Excel Sheet
- 2215. Find the Difference of Two Arrays
- 2220. Minimum Bit Flips to Convert Number
- 2235. Add Two Integers
- 2236. Root Equals Sum of Children
- 2315. Count Asterisks
- 2325. Decode the Message
- 2367. Number of Arithmetic Triplets
- 2399. Check Distances Between Same Letters
- 2413. Smallest Even Multiple
- 2418. Sort the People
- 2427. Number of Common Factors
- 2469. Convert the Temperature
- 2485. Find the Pivot Integer
- 2500. Delete Greatest Value in Each Row
- 2520. Count the Digits That Divide a Number
- 2535. Difference Between Element Sum and Digit Sum of an Array
- 2553. Separate the Digits in an Array
- 2574. Left and Right Sum Differences
- 2656. Maximum Sum With Exactly K Elements
- 2710. Remove Trailing Zeros From a String
- 2733. Neither Minimum nor Maximum
- 2769. Find the Maximum Achievable Number
- 2798. Number of Employees Who Met the Target
- 2824. Count Pairs Whose Sum is Less than Target
- 2859. Sum of Values at Indices With K Set Bits
- 2. Add Two Numbers
- 3. Longest Substring Without Repeating Chpraracters
- 5. Longest Palindromic Substring
- 7. Reverse Integer
- 8. String to Integer (atoi)
- 11. Container With Most Water
- 12. Integer to Roman
- 15. 3Sum
- 17. Letter Combinations of a Phone Number
- 19. Remove Nth Node From End of List
- 22. Generate Parentheses
- 24. Swap Nodes in Pairs
- 29. Divide Two Integers
- 33. Search in Rotated Sorted Array
- 34. Find First and Last Position of Element in Sorted Array
- 45. Jump Game II
- 46. Permutations
- 48. Rotate Image
- 49. Group Anagrams
- 50. Pow(x, n)
- 54. Spiral Matrix
- 55. Jump Game
- 59. Spiral Matrix II
- 62. Unique Paths
- 71. Simplify Path
- 74. Search a 2D Matrix
- 77. Combinations
- 81. Search in Rotated Sorted Array II
- 98. Validate Binary Search Tree
- 102. Binary Tree Level Order Traversal
- 116. Populating Next Right Pointers in Each Node
- 120. Triangle
- 122. Best Time to Buy and Sell Stock II
- 133. Clone Graph
- 139. Word Break
- 142. Linked List Cycle II
- 151. Reverse Words in a String
- 167. Two Sum II - Input Array Is Sorted
- 189. Rotate Array
- 198. House Robber
- 200. Number of Islands
- 229. Majority Element II
- 235. Lowest Common Ancestor of a Binary Search Tree
- 238. Product of Array Except Self
- 287. Find the Duplicate Number
- 299. Bulls and Cows
- 300. Longest Increasing Subsequence
- 319. Bulb Switcher
- 334. Increasing Triplet Subsequence
- 343. Integer Break
- 347. Top K Frequent Elements
- 394. Decode String
- 424. Longest Repeating Character Replacement
- 438. Find All Anagrams in a String
- 443. String Compression
- 516. Longest Palindromic Subsequence
- 540. Single Element in a Sorted Array
- 542. 01 Matrix
- 567. Permutation in String
- 646. Maximum Length of Pair Chain
- 649. Dota2 Senate
- 662. Maximum Width of Binary Tree
- 684. Redundant Connection
- 692. Top K Frequent Words
- 695. Max Area of Island
- 714. Best Time to Buy and Sell Stock with Transaction Fee
- 763. Partition Labels
- 767. Reorganize String
- 779. K-th Symbol in Grammar
- 784. Letter Case Permutation
- 785. Is Graph Bipartite?
- 837. New 21 Game
- 852. Peak Index in a Mountain Array
- 880. Decoded String at Index
- 881. Boats to Save People
- 904. Fruit Into Baskets
- 934. Shortest Bridge
- 935. Knight Dialer
- 946. Validate Stack Sequences
- 994. Rotting Oranges
- 1004. Max Consecutive Ones III
- 1020. Number of Enclaves
- 1035. Uncrossed Lines
- 1091. Shortest Path in Binary Matrix
- 1140. Stone Game II
- 1143. Longest Common Subsequence
- 1218. Longest Arithmetic Subsequence of Given Difference
- 1254. Number of Closed Islands
- 1282. Group the People Given the Group Size They Belong To
- 1302. Deepest Leaves Sum
- 1318. Minimum Flips to Make a OR b Equal to c
- 1372. Longest ZigZag Path in a Binary Tree
- 1396. Design Underground System
- 1424. Diagonal Traverse II
- 1441. Build an Array With Stack Operations
- 1456. Maximum Number of Vowels in a Substring of Given Length
- 1476. Subrectangle Queries
- 1493. Longest Subarray of 1's After Deleting One Element
- 1498. Number of Subsequences That Satisfy the Given Sum Condition
- 1557. Minimum Number of Vertices to Reach All Nodes
- 1561. Maximum Number of Coins You Can Get
- 1630. Arithmetic Subarrays
- 1647. Minimum Deletions to Make Character Frequencies Unique
- 1679. Max Number of K-Sum Pairs
- 1689. Partitioning Into Minimum Number Of Deci-Binary Numbers
- 1721. Swapping Nodes in a Linked List
- 1743. Restore the Array From Adjacent Pairs
- 1759. Count Number of Homogenous Substrings
- 1814. Count Nice Pairs in an Array
- 1828. Queries on Number of Points Inside a Circle
- 1846. Maximum Element After Decreasing and Rearranging
- 1877. Minimize Maximum Pair Sum in Array
- 1930. Unique Length-3 Palindromic Subsequences
- 1980. Find Unique Binary String
- 2024. Maximize the Confusion of an Exam
- 2090. K Radius Subarray Averages
- 2101. Detonate the Maximum Bombs
- 2130. Maximum Twin Sum of a Linked List
- 2140. Solving Questions With Brainpower
- 2149. Rearrange Array Elements by Sign
- 2181. Merge Nodes in Between Zeros
- 2221. Find Triangular Sum of an Array
- 2265. Count Nodes Equal to Average of Subtree
- 2300. Successful Pairs of Spells and Potions
- 2336. Smallest Number in Infinite Set
- 2352. Equal Row and Column Pairs
- 2390. Removing Stars From a String
- 2391. Minimum Amount of Time to Collect Garbage
- 2396. Strictly Palindromic Number
- 2405. Optimal Partition of String
- 2433. Find The Original Array of Prefix Xor
- 2439. Minimize Maximum of Array
- 2442. Count Number of Distinct Integers After Reverse Operations
- 2466. Count Ways To Build Good Strings
- 2542. Maximum Subsequence Score
- 2545. Sort the Students by Their Kth Score
- 2610. Convert an Array Into a 2D Array With Conditions
- 2657. Find the Prefix Common Array of Two Arrays
- 2785. Sort Vowels in a String
- 2807. Insert Greatest Common Divisors in Linked List
- 2849. Determine if a Cell Is Reachable at a Given Time
- 4. Median of Two Sorted Arrays
- 68. Text Justification
- 135. Candy
- 332. Reconstruct Itinerary
- 839. Similar String Groups
- 879. Profitable Schemes
- 1312. Minimum Insertion Steps to Make a String Palindrome
- 1402. Reducing Dishes
- 1406. Stone Game III
- 1416. Restore The Array
- 1547. Minimum Cost to Cut a Stick
- 1579. Remove Max Number of Edges to Keep Graph Fully Traversable
- 1639. Number of Ways to Form a Target String Given a Dictionary
- 1697. Checking Existence of Edge Length Limited Paths
- 1799. Maximize Score After N Operations
- 1857. Largest Color Value in a Directed Graph
- 1964. Find the Longest Valid Obstacle Course at Each Position
- 2218. Maximum Value of K Coins From Piles
- 2306. Naming a Company
- 2448. Minimum Cost to Make Array Equal
- 175. Combine Two Tables
- 176. Second Highest Salary
- 181. Employees Earning More Than Their Managers
- 182. Duplicate Emails
- 183. Customers Who Never Order
- 196. Delete Duplicate Emails
- 197. Rising Temperature
- 511. Game Play Analysis I
- 584. Find Customer Referee
- 586. Customer Placing the Largest Number of Orders
- 595. Big Countries
- 607. Sales Person
- 608. Tree Node
- 627. Swap Salary
- 1050. Actors and Directors Who Cooperated At Least Three Times
- 1068. Product Sales Analysis I
- 1084. Sales Analysis III
- 1141. User Activity for the Past 30 Days I
- 1148. Article Views I
- 1158. Market Analysis I
- 1378. Replace Employee ID With The Unique Identifier
- 1393. Capital Gain/Loss
- 1407. Top Travellers
- 1484. Group Sold Products By The Date
- 1527. Patients With a Condition
- 1581. Customer Who Visited but Did Not Make Any Transactions
- 1587. Bank Account Summary II
- 1667. Fix Names in a Table
- 1683. Invalid Tweets
- 1693. Daily Leads and Partners
- 1729. Find Followers Count
- 1741. Find Total Time Spent by Each Employee
- 1757. Recyclable and Low Fat Products
- 1789. Primary Department for Each Employee
- 1795. Rearrange Products Table
- 1873. Calculate Special Bonus
- 1890. The Latest Login in 2020
- 1965. Employees With Missing Information
- 2356. Number of Unique Subjects Taught by Each Teacher