Data Structures > Hashing & Sets

Hash Function

• 3327. Check if DFS Strings Are Palindromes
• 3292. Minimum Number of Valid Strings to Form Target II
• 3291. Minimum Number of Valid Strings to Form Target I
• 3135. Equalize Strings by Adding or Removing Characters at Ends
• 3045. Count Prefix and Suffix Pairs II
• 3042. Count Prefix and Suffix Pairs I
• 3037. Find Pattern in Infinite Stream II
• 3036. Number of Subarrays That Match a Pattern II
• 3034. Number of Subarrays That Match a Pattern I
• 3031. Minimum Time to Revert Word to Initial State II
• 3029. Minimum Time to Revert Word to Initial State I
• 3023. Find Pattern in Infinite Stream I
• 3008. Find Beautiful Indices in the Given Array II
• 3006. Find Beautiful Indices in the Given Array I
• 2430. Maximum Deletions on a String
• 2261. K Divisible Elements Subarrays
• 2223. Sum of Scores of Built Strings
• 2168. Unique Substrings With Equal Digit Frequency
• 2156. Find Substring With Given Hash Value
• 1960. Maximum Product of the Length of Two Palindromic Substrings
• 1948. Delete Duplicate Folders in System
• 1923. Longest Common Subpath
• 1698. Number of Distinct Substrings in a String
• 1554. Strings Differ by One Character
• 1461. Check If a String Contains All Binary Codes of Size K
• 1392. Longest Happy Prefix
• 1316. Distinct Echo Substrings
• 1147. Longest Chunked Palindrome Decomposition
• 1062. Longest Repeating Substring
• 1044. Longest Duplicate Substring
• 718. Maximum Length of Repeated Subarray
• 711. Number of Distinct Islands II
• 706. Design HashMap
• 705. Design HashSet
• 694. Number of Distinct Islands
• 572. Subtree of Another Tree
• 535. Encode and Decode TinyURL
• 214. Shortest Palindrome
• 187. Repeated DNA Sequences

Hash Table

• 3505. Minimum Operations to Make Elements Within K Subarrays Equal
• 3493. Properties Graph
• 3488. Closest Equal Element Queries
• 3487. Maximum Unique Subarray Sum After Deletion
• 3486. Longest Special Path II
• 3484. Design Spreadsheet
• 3483. Unique 3-Digit Even Numbers
• 3481. Apply Substitutions
• 3471. Find the Largest Almost Missing Integer
• 3458. Select K Disjoint Special Substrings
• 3450. Maximum Students on a Single Bench
• 3447. Assign Elements to Groups with Constraints
• 3443. Maximum Manhattan Distance After K Changes
• 3442. Maximum Difference Between Even and Odd Frequency I
• 3438. Find Valid Pair of Adjacent Digits in String
• 3434. Maximum Frequency After Subarray Operation
• 3431. Minimum Unlocked Indices to Sort Nums
• 3425. Longest Special Path
• 3422. Minimum Operations to Make Subarray Elements Equal
• 3416. Subsequences with a Unique Middle Mode II
• 3412. Find Mirror Score of a String
• 3408. Design Task Manager
• 3404. Count Special Subsequences
• 3396. Minimum Number of Operations to Make Elements in Array Distinct
• 3395. Subsequences with a Unique Middle Mode I
• 3391. Design a 3D Binary Matrix with Efficient Layer Tracking
• 3389. Minimum Operations to Make Character Frequencies Equal
• 3381. Maximum Subarray Sum With Length Divisible by K
• 3378. Count Connected Components in LCM Graph
• 3375. Minimum Operations to Make Array Values Equal to K
• 3371. Identify the Largest Outlier in an Array
• 3369. Design an Array Statistics Tracker
• 3365. Rearrange K Substrings to Form Target String
• 3351. Sum of Good Subsequences
• 3337. Total Characters in String After Transformations II
• 3335. Total Characters in String After Transformations I
• 3331. Find Subtree Sizes After Changes
• 3329. Count Substrings With K-Frequency Characters II
• 3327. Check if DFS Strings Are Palindromes
• 3325. Count Substrings With K-Frequency Characters I
• 3321. Find X-Sum of All K-Long Subarrays II
• 3318. Find X-Sum of All K-Long Subarrays I
• 3316. Find Maximum Removals From Source String
• 3312. Sorted GCD Pair Queries
• 3311. Construct 2D Grid Matching Graph Layout
• 3306. Count of Substrings Containing Every Vowel and K Consonants II
• 3305. Count of Substrings Containing Every Vowel and K Consonants I
• 3299. Sum of Consecutive Subsequences
• 3298. Count Substrings That Can Be Rearranged to Contain a String II
• 3297. Count Substrings That Can Be Rearranged to Contain a String I
• 3295. Report Spam Message
• 3289. The Two Sneaky Numbers of Digitville
• 3279. Maximum Total Area Occupied by Pistons
• 3272. Find the Count of Good Integers
• 3267. Count Almost Equal Pairs II
• 3265. Count Almost Equal Pairs I
• 3242. Design Neighbor Sum Service
• 3238. Find the Number of Winning Players
• 3237. Alt and Tab Simulation
• 3224. Minimum Array Changes to Make Differences Equal
• 3223. Minimum Length of String After Operations
• 3217. Delete Nodes From Linked List Present in Array
• 3186. Maximum Total Damage With Spell Casting
• 3185. Count Pairs That Form a Complete Day II
• 3184. Count Pairs That Form a Complete Day I
• 3177. Find the Maximum Length of a Good Subsequence II
• 3176. Find the Maximum Length of a Good Subsequence I
• 3170. Lexicographically Minimum String After Removing Stars
• 3167. Better Compression of String
• 3164. Find the Number of Good Pairs II
• 3162. Find the Number of Good Pairs I
• 3160. Find the Number of Distinct Colors Among the Balls
• 3159. Find Occurrences of an Element in an Array
• 3158. Find the XOR of Numbers Which Appear Twice
• 3153. Sum of Digit Differences of All Pairs
• 3146. Permutation Difference between Two Strings
• 3144. Minimum Substring Partition of Equal Character Frequency
• 3143. Maximum Points Inside the Square
• 3138. Minimum Length of Anagram Concatenation
• 3137. Minimum Number of Operations to Make Word K-Periodic
• 3134. Find the Median of the Uniqueness Array
• 3128. Right Triangles
• 3121. Count the Number of Special Characters II
• 3120. Count the Number of Special Characters I
• 3104. Find Longest Self-Contained Substring
• 3092. Most Frequent IDs
• 3090. Maximum Length Substring With Two Occurrences
• 3085. Minimum Deletions to Make String K-Special
• 3083. Existence of a Substring in a String and Its Reverse
• 3081. Replace Question Marks in String to Minimize Its Value
• 3080. Mark Elements on Array by Performing Queries
• 3078. Match Alphanumerical Pattern in Matrix I
• 3076. Shortest Uncommon Substring in an Array
• 3071. Minimum Operations to Write the Letter Y on a Grid
• 3063. Linked List Frequency
• 3046. Split the Array
• 3044. Most Frequent Prime
• 3043. Find the Length of the Longest Common Prefix
• 3039. Apply Operations to Make String Empty
• 3035. Maximum Palindromes After Operations
• 3032. Count Numbers With Unique Digits II
• 3026. Maximum Good Subarray Sum
• 3020. Find the Maximum Number of Elements in Subset
• 3016. Minimum Number of Pushes to Type Word II
• 3013. Divide an Array Into Subarrays With Minimum Cost II
• 3005. Count Elements With Maximum Frequency
• 3002. Maximum Size of a Set After Removals
• 2996. Smallest Missing Integer Greater Than Sequential Prefix Sum
• 2983. Palindrome Rearrangement Queries
• 2982. Find Longest Special Substring That Occurs Thrice II
• 2981. Find Longest Special Substring That Occurs Thrice I
• 2975. Maximum Square Area by Removing Fences From a Field
• 2965. Find Missing and Repeated Values
• 2964. Number of Divisible Triplet Sums
• 2963. Count the Number of Good Partitions
• 2958. Length of Longest Subarray With at Most K Frequency
• 2956. Find Common Elements Between Two Arrays
• 2955. Number of Same-End Substrings
• 2953. Count Complete Substrings
• 2950. Number of Divisible Substrings
• 2949. Count Beautiful Substrings II
• 2947. Count Beautiful Substrings I
• 2935. Maximum Strong Pair XOR II
• 2933. High-Access Employees
• 2932. Maximum Strong Pair XOR I
• 2913. Subarrays Distinct Element Sum of Squares I
• 2910. Minimum Number of Groups to Create a Valid Assignment
• 2902. Count of Sub-Multisets With Bounded Sum
• 2898. Maximum Linear Stock Score
• 2897. Apply Operations on Array to Maximize Sum of Squares
• 2875. Minimum Size Subarray in Infinite Array
• 2870. Minimum Number of Operations to Make Array Empty
• 2869. Minimum Operations to Collect Elements
• 2857. Count Pairs of Points With Distance k
• 2856. Minimum Array Length After Pair Removals
• 2852. Sum of Remoteness of All Cells
• 2848. Points That Intersect With Cars
• 2845. Count of Interesting Subarrays
• 2842. Count K-Subsequences of a String With Maximum Beauty
• 2841. Maximum Sum of Almost Unique Subarray
• 2840. Check if Strings Can be Made Equal With Operations II
• 2831. Find the Longest Equal Subarray
• 2830. Maximize the Profit as the Salesman
• 2815. Max Pair Sum in an Array
• 2813. Maximum Elegance of a K-Length Subsequence
• 2808. Minimum Seconds to Equalize a Circular Array
• 2799. Count Complete Subarrays in an Array
• 2784. Check if Array is Good
• 2781. Length of the Longest Valid Substring
• 2780. Minimum Index of a Valid Split
• 2768. Number of Black Blocks
• 2767. Partition String Into Minimum Beautiful Substrings
• 2766. Relocate Marbles
• 2763. Sum of Imbalance Numbers of All Subarrays
• 2748. Number of Beautiful Pairs
• 2747. Count Zero Request Servers
• 2744. Find Maximum Number of String Pairs
• 2743. Count Substrings Without Repeating Character
• 2732. Find a Good Subset of the Matrix
• 2729. Check if The Number is Fascinating
• 2718. Sum of Matrix After Queries
• 2716. Minimize String Length
• 2713. Maximum Strictly Increasing Cells in a Matrix
• 2711. Difference of Number of Distinct Values on Diagonals
• 2707. Extra Characters in a String
• 2682. Find the Losers of the Circular Game
• 2671. Frequency Tracker
• 2670. Find the Distinct Difference Array
• 2661. First Completely Painted Row or Column
• 2657. Find the Prefix Common Array of Two Arrays
• 2653. Sliding Subarray Beauty
• 2641. Cousins in Binary Tree II
• 2615. Sum of Distances
• 2610. Convert an Array Into a 2D Array With Conditions
• 2606. Find the Substring With Maximum Cost
• 2605. Form Smallest Number From Two Digit Arrays
• 2598. Smallest Missing Non-negative Integer After Operations
• 2597. The Number of Beautiful Subsets
• 2593. Find Score of an Array After Marking All Elements
• 2590. Design a Todo List
• 2588. Count the Number of Beautiful Subarrays
• 2584. Split the Array to Make Coprime Products
• 2581. Count Number of Possible Root Nodes
• 2570. Merge Two 2D Arrays by Summing Values
• 2564. Substring XOR Queries
• 2561. Rearranging Fruits
• 2554. Maximum Number of Integers to Choose From a Range I
• 2549. Count Distinct Numbers on Board
• 2547. Minimum Cost to Split an Array
• 2540. Minimum Common Value
• 2539. Count the Number of Good Subsequences
• 2537. Count the Number of Good Subarrays
• 2531. Make Number of Distinct Characters Equal
• 2526. Find Consecutive Integers from a Data Stream
• 2524. Maximum Frequency Score of a Subarray
• 2521. Distinct Prime Factors of Product of Array
• 2516. Take K of Each Character From Left and Right
• 2514. Count Anagrams
• 2512. Reward Top K Students
• 2508. Add Edges to Make Degrees of All Nodes Even
• 2506. Count Pairs Of Similar Strings
• 2502. Design Memory Allocator
• 2501. Longest Square Streak in an Array
• 2499. Minimum Total Cost to Make Arrays Unequal
• 2491. Divide Players Into Teams of Equal Skill
• 2489. Number of Substrings With Fixed Ratio
• 2488. Count Subarrays With Median K
• 2475. Number of Unequal Triplets in Array
• 2465. Number of Distinct Averages
• 2461. Maximum Sum of Distinct Subarrays With Length K
• 2456. Most Popular Video Creator
• 2453. Destroy Sequential Targets
• 2451. Odd String Difference
• 2442. Count Number of Distinct Integers After Reverse Operations
• 2441. Largest Positive Integer That Exists With Its Negative
• 2434. Using a Robot to Print the Lexicographically Smallest String
• 2423. Remove Letter To Equalize Frequency
• 2421. Number of Good Paths
• 2418. Sort the People
• 2408. Design SQL
• 2405. Optimal Partition of String
• 2404. Most Frequent Even Element
• 2402. Meeting Rooms III
• 2399. Check Distances Between Same Letters
• 2395. Find Subarrays With Equal Sum
• 2385. Amount of Time for Binary Tree to Be Infected
• 2384. Largest Palindromic Number
• 2374. Node With Highest Edge Score
• 2370. Longest Ideal Subsequence
• 2368. Reachable Nodes With Restrictions
• 2367. Number of Arithmetic Triplets
• 2365. Task Scheduler II
• 2364. Count Number of Bad Pairs
• 2363. Merge Similar Items
• 2357. Make Array Zero by Subtracting Equal Amounts
• 2354. Number of Excellent Pairs
• 2353. Design a Food Rating System
• 2352. Equal Row and Column Pairs
• 2351. First Letter to Appear Twice
• 2350. Shortest Impossible Sequence of Rolls
• 2349. Design a Number Container System
• 2347. Best Poker Hand
• 2342. Max Sum of a Pair With Equal Sum of Digits
• 2341. Maximum Number of Pairs in Array
• 2336. Smallest Number in Infinite Set
• 2325. Decode the Message
• 2309. Greatest English Letter in Upper and Lower Case
• 2306. Naming a Company
• 2301. Match Substring After Replacement
• 2295. Replace Elements in an Array
• 2287. Rearrange Characters to Make Target String
• 2284. Sender With Largest Word Count
• 2283. Check if Number Has Equal Digit Count and Digit Value
• 2275. Largest Combination With Bitwise AND Greater Than Zero
• 2273. Find Resultant Array After Removing Anagrams
• 2268. Minimum Number of Keypresses
• 2266. Count Number of Texts
• 2262. Total Appeal of A String
• 2261. K Divisible Elements Subarrays
• 2260. Minimum Consecutive Cards to Pick Up
• 2254. Design Video Sharing Platform
• 2251. Number of Flowers in Full Bloom
• 2250. Count Number of Rectangles Containing Each Point
• 2249. Count Lattice Points Inside a Circle
• 2248. Intersection of Multiple Arrays
• 2244. Minimum Rounds to Complete All Tasks
• 2229. Check if an Array Is Consecutive
• 2227. Encrypt and Decrypt Strings
• 2225. Find Players With Zero or One Losses
• 2215. Find the Difference of Two Arrays
• 2206. Divide Array Into Equal Pairs
• 2201. Count Artifacts That Can Be Extracted
• 2196. Create Binary Tree From Descriptions
• 2190. Most Frequent Number Following Key In an Array
• 2186. Minimum Number of Steps to Make Two Strings Anagram II
• 2182. Construct String With Repeat Limit
• 2170. Minimum Operations to Make the Array Alternating
• 2168. Unique Substrings With Equal Digit Frequency
• 2166. Design Bitset
• 2154. Keep Multiplying Found Values by Two
• 2152. Minimum Number of Lines to Cover Points
• 2150. Find All Lonely Numbers in the Array
• 2135. Count Words Obtained After Adding a Letter
• 2133. Check if Every Row and Column Contains All Numbers
• 2131. Longest Palindrome by Concatenating Two Letter Words
• 2122. Recover the Original Array
• 2121. Intervals Between Identical Elements
• 2115. Find All Possible Recipes from Given Supplies
• 2107. Number of Unique Flavors After Sharing K Candies
• 2103. Rings and Rods
• 2099. Find Subsequence of Length K With the Largest Sum
• 2094. Finding 3-Digit Even Numbers
• 2085. Count Common Words With One Occurrence
• 2083. Substrings That Begin and End With the Same Letter
• 2080. Range Frequency Queries
• 2068. Check Whether Two Strings are Almost Equivalent
• 2067. Number of Equal Count Substrings
• 2062. Count Vowel Substrings of a String
• 2053. Kth Distinct String in an Array
• 2048. Next Greater Numerically Balanced Number
• 2043. Simple Bank System
• 2034. Stock Price Fluctuation
• 2032. Two Out of Three
• 2025. Maximum Number of Ways to Partition an Array
• 2023. Number of Pairs of Strings With Concatenation Equal to Target
• 2013. Detect Squares
• 2009. Minimum Number of Operations to Make Array Continuous
• 2008. Maximum Earnings From Taxi
• 2007. Find Original Array From Doubled Array
• 2006. Count Number of Pairs With Absolute Difference K
• 2001. Number of Pairs of Interchangeable Rectangles
• 1995. Count Special Quadruplets
• 1993. Operations on Tree
• 1983. Widest Pair of Indices With Equal Range Sum
• 1980. Find Unique Binary String
• 1948. Delete Duplicate Folders in System
• 1943. Describe the Painting
• 1942. The Number of the Smallest Unoccupied Chair
• 1941. Check if All Characters Have Equal Number of Occurrences
• 1940. Longest Common Subsequence Between Sorted Arrays
• 1938. Maximum Genetic Difference Query
• 1935. Maximum Number of Words You Can Type
• 1932. Merge BSTs to Create Single BST
• 1930. Unique Length-3 Palindromic Subsequences
• 1915. Number of Wonderful Substrings
• 1912. Design Movie Rental System
• 1906. Minimum Absolute Difference Queries
• 1897. Redistribute Characters to Make All Strings Equal
• 1893. Check if All the Integers in a Range Are Covered
• 1876. Substrings of Size Three with Distinct Characters
• 1865. Finding Pairs With a Certain Sum
• 1857. Largest Color Value in a Directed Graph
• 1852. Distinct Numbers in Each Subarray
• 1836. Remove Duplicates From an Unsorted Linked List
• 1832. Check if the Sentence Is Pangram
• 1817. Finding the Users Active Minutes
• 1814. Count Nice Pairs in an Array
• 1807. Evaluate the Bracket Pairs of a String
• 1805. Number of Different Integers in a String
• 1804. Implement Trie II (Prefix Tree)
• 1797. Design Authentication Manager
• 1796. Second Largest Digit in a String
• 1794. Count Pairs of Equal Substrings With Minimum Difference
• 1790. Check if One String Swap Can Make Strings Equal
• 1788. Maximize the Beauty of the Garden
• 1781. Sum of Beauty of All Substrings
• 1775. Equal Sum Arrays With Minimum Number of Operations
• 1772. Sort Features by Popularity
• 1763. Longest Nice Substring
• 1756. Design Most Recently Used Queue
• 1748. Sum of Unique Elements
• 1743. Restore the Array From Adjacent Pairs
• 1742. Maximum Number of Balls in a Box
• 1740. Find Distance in a Binary Tree
• 1737. Change Minimum Characters to Satisfy One of Three Conditions
• 1733. Minimum Number of People to Teach
• 1726. Tuple with Same Product
• 1713. Minimum Operations to Make a Subsequence
• 1711. Count Good Meals
• 1695. Maximum Erasure Value
• 1684. Count the Number of Consistent Strings
• 1679. Max Number of K-Sum Pairs
• 1676. Lowest Common Ancestor of a Binary Tree IV
• 1674. Minimum Moves to Make Array Complementary
• 1660. Correct a Binary Tree
• 1658. Minimum Operations to Reduce X to Zero
• 1657. Determine if Two Strings Are Close
• 1656. Design an Ordered Stream
• 1650. Lowest Common Ancestor of a Binary Tree III
• 1647. Minimum Deletions to Make Character Frequencies Unique
• 1640. Check Array Formation Through Concatenation
• 1638. Count Substrings That Differ by One Character
• 1636. Sort Array by Increasing Frequency
• 1630. Arithmetic Subarrays
• 1624. Largest Substring Between Two Equal Characters
• 1612. Check If Two Expression Trees are Equivalent
• 1604. Alert Using Same Key-Card Three or More Times in a One Hour Period
• 1600. Throne Inheritance
• 1593. Split a String Into the Max Number of Unique Substrings
• 1590. Make Sum Divisible by P
• 1577. Number of Ways Where Square of Number Is Equal to Product of Two Numbers
• 1570. Dot Product of Two Sparse Vectors
• 1562. Find Latest Group of Size M
• 1554. Strings Differ by One Character
• 1546. Maximum Number of Non-Overlapping Subarrays With Sum Equals Target
• 1542. Find Longest Awesome Substring
• 1540. Can Convert String in K Moves
• 1525. Number of Good Ways to Split a String
• 1519. Number of Nodes in the Sub-Tree With the Same Label
• 1512. Number of Good Pairs
• 1506. Find Root of N-Ary Tree
• 1500. Design a File Sharing System
• 1497. Check If Array Pairs Are Divisible by k
• 1496. Path Crossing
• 1490. Clone N-ary Tree
• 1488. Avoid Flood in The City
• 1487. Making File Names Unique
• 1485. Clone Binary Tree With Random Pointer
• 1481. Least Number of Unique Integers after K Removals
• 1477. Find Two Non-overlapping Sub-arrays Each With Target Sum
• 1461. Check If a String Contains All Binary Codes of Size K
• 1460. Make Two Arrays Equal by Reversing Subarrays
• 1452. People Whose List of Favorite Companies Is Not a Subset of Another List
• 1443. Minimum Time to Collect All Apples in a Tree
• 1442. Count Triplets That Can Form Two Arrays of Equal XOR
• 1436. Destination City
• 1429. First Unique Number
• 1426. Counting Elements
• 1418. Display Table of Food Orders in a Restaurant
• 1410. HTML Entity Parser
• 1400. Construct K Palindrome Strings
• 1399. Count Largest Group
• 1396. Design Underground System
• 1394. Find Lucky Integer in an Array
• 1386. Cinema Seat Allocation
• 1371. Find the Longest Substring Containing Vowels in Even Counts
• 1370. Increasing Decreasing String
• 1366. Rank Teams by Votes
• 1365. How Many Numbers Are Smaller Than the Current Number
• 1358. Number of Substrings Containing All Three Characters
• 1357. Apply Discount Every n Orders
• 1348. Tweet Counts Per Frequency
• 1347. Minimum Number of Steps to Make Two Strings Anagram
• 1346. Check If N and Its Double Exist
• 1345. Jump Game IV
• 1338. Reduce Array Size to The Half
• 1331. Rank Transform of an Array
• 1311. Get Watched Videos by Your Friends
• 1297. Maximum Number of Occurrences of a Substring
• 1296. Divide Array in Sets of K Consecutive Numbers
• 1284. Minimum Number of Flips to Convert Binary Matrix to Zero Matrix
• 1282. Group the People Given the Group Size They Belong To
• 1275. Find Winner on a Tic Tac Toe Game
• 1261. Find Elements in a Contaminated Binary Tree
• 1258. Synonymous Sentences
• 1257. Smallest Common Region
• 1248. Count Number of Nice Subarrays
• 1244. Design A Leaderboard
• 1224. Maximum Equal Frequency
• 1218. Longest Arithmetic Subsequence of Given Difference
• 1213. Intersection of Three Sorted Arrays
• 1207. Unique Number of Occurrences
• 1202. Smallest String With Swaps
• 1198. Find Smallest Common Element in All Rows
• 1189. Maximum Number of Balloons
• 1181. Before and After Puzzle
• 1178. Number of Valid Words for Each Puzzle
• 1177. Can Make Palindrome from Substring
• 1172. Dinner Plate Stacks
• 1171. Remove Zero Sum Consecutive Nodes from Linked List
• 1170. Compare Strings by Frequency of the Smallest Character
• 1169. Invalid Transactions
• 1166. Design File System
• 1165. Single-Row Keyboard
• 1160. Find Words That Can Be Formed by Characters
• 1156. Swap For Longest Repeated Character Substring
• 1153. String Transforms Into Another String
• 1152. Analyze User Website Visit Pattern
• 1146. Snapshot Array
• 1138. Alphabet Board Path
• 1133. Largest Unique Number
• 1128. Number of Equivalent Domino Pairs
• 1124. Longest Well-Performing Interval
• 1123. Lowest Common Ancestor of Deepest Leaves
• 1122. Relative Sort Array
• 1110. Delete Nodes And Return Forest
• 1100. Find K-Length Substrings With No Repeated Characters
• 1090. Largest Values From Labels
• 1086. High Five
• 1079. Letter Tile Possibilities
• 1074. Number of Submatrices That Sum to Target
• 1072. Flip Columns For Maximum Number of Equal Rows
• 1054. Distant Barcodes
• 1048. Longest String Chain
• 1036. Escape a Large Maze
• 1027. Longest Arithmetic Subsequence
• 1015. Smallest Integer Divisible by K
• 1010. Pairs of Songs With Total Durations Divisible by 60
• 1002. Find Common Characters
• 1001. Grid Illumination
• 997. Find the Town Judge
• 996. Number of Squareful Arrays
• 992. Subarrays with K Different Integers
• 987. Vertical Order Traversal of a Binary Tree
• 982. Triples with Bitwise AND Equal To Zero
• 981. Time Based Key-Value Store
• 974. Subarray Sums Divisible by K
• 970. Powerful Integers
• 966. Vowel Spellchecker
• 961. N-Repeated Element in Size 2N Array
• 959. Regions Cut By Slashes
• 957. Prison Cells After N Days
• 954. Array of Doubled Pairs
• 953. Verifying an Alien Dictionary
• 952. Largest Component Size by Common Factor
• 947. Most Stones Removed with Same Row or Column
• 939. Minimum Area Rectangle
• 930. Binary Subarrays With Sum
• 929. Unique Email Addresses
• 928. Minimize Malware Spread II
• 924. Minimize Malware Spread
• 923. 3Sum With Multiplicity
• 916. Word Subsets
• 914. X of a Kind in a Deck of Cards
• 911. Online Election
• 904. Fruit Into Baskets
• 895. Maximum Frequency Stack
• 893. Groups of Special-Equivalent Strings
• 890. Find and Replace Pattern
• 889. Construct Binary Tree from Preorder and Postorder Traversal
• 888. Fair Candy Swap
• 884. Uncommon Words from Two Sentences
• 874. Walking Robot Simulation
• 873. Length of Longest Fibonacci Subsequence
• 869. Reordered Power of 2
• 865. Smallest Subtree with all the Deepest Nodes
• 863. All Nodes Distance K in Binary Tree
• 859. Buddy Strings
• 846. Hand of Straights
• 840. Magic Squares In Grid
• 839. Similar String Groups
• 833. Find And Replace in String
• 828. Count Unique Characters of All Substrings of a Given String
• 823. Binary Trees With Factors
• 822. Card Flipping Game
• 820. Short Encoding of Words
• 819. Most Common Word
• 817. Linked List Components
• 815. Bus Routes
• 811. Subdomain Visit Count
• 804. Unique Morse Code Words
• 792. Number of Matching Subsequences
• 791. Custom Sort String
• 781. Rabbits in Forest
• 771. Jewels and Stones
• 770. Basic Calculator IV
• 767. Reorganize String
• 763. Partition Labels
• 760. Find Anagram Mappings
• 758. Bold Words in String
• 752. Open the Lock
• 748. Shortest Completing Word
• 745. Prefix and Suffix Search
• 740. Delete and Earn
• 737. Sentence Similarity II
• 736. Parse Lisp Expression
• 734. Sentence Similarity
• 726. Number of Atoms
• 721. Accounts Merge
• 720. Longest Word in Dictionary
• 711. Number of Distinct Islands II
• 710. Random Pick with Blacklist
• 706. Design HashMap
• 705. Design HashSet
• 697. Degree of an Array
• 694. Number of Distinct Islands
• 692. Top K Frequent Words
• 691. Stickers to Spell Word
• 690. Employee Importance
• 681. Next Closest Time
• 677. Map Sum Pairs
• 676. Implement Magic Dictionary
• 666. Path Sum IV
• 659. Split Array into Consecutive Subsequences
• 653. Two Sum IV - Input is a BST
• 652. Find Duplicate Subtrees
• 648. Replace Words
• 645. Set Mismatch
• 635. Design Log Storage System
• 632. Smallest Range Covering Elements from K Lists
• 631. Design Excel Sum Formula
• 621. Task Scheduler
• 616. Add Bold Tag in String
• 609. Find Duplicate File in System
• 599. Minimum Index Sum of Two Lists
• 594. Longest Harmonious Subsequence
• 588. Design In-Memory File System
• 582. Kill Process
• 575. Distribute Candies
• 567. Permutation in String
• 560. Subarray Sum Equals K
• 554. Brick Wall
• 548. Split Array with Equal Sum
• 535. Encode and Decode TinyURL
• 533. Lonely Pixel II
• 532. K-diff Pairs in an Array
• 531. Lonely Pixel I
• 525. Contiguous Array
• 523. Continuous Subarray Sum
• 522. Longest Uncommon Subsequence II
• 519. Random Flip Matrix
• 508. Most Frequent Subtree Sum
• 500. Keyboard Row
• 496. Next Greater Element I
• 491. Non-decreasing Subsequences
• 480. Sliding Window Median
• 460. LFU Cache
• 457. Circular Array Loop
• 454. 4Sum II
• 451. Sort Characters By Frequency
• 448. Find All Numbers Disappeared in an Array
• 447. Number of Boomerangs
• 442. Find All Duplicates in an Array
• 438. Find All Anagrams in a String
• 433. Minimum Genetic Mutation
• 432. All O`one Data Structure
• 424. Longest Repeating Character Replacement
• 423. Reconstruct Original Digits from English
• 421. Maximum XOR of Two Numbers in an Array
• 409. Longest Palindrome
• 398. Random Pick Index
• 395. Longest Substring with At Least K Repeating Characters
• 389. Find the Difference
• 387. First Unique Character in a String
• 383. Ransom Note
• 381. Insert Delete GetRandom O(1) - Duplicates allowed
• 380. Insert Delete GetRandom O(1)
• 379. Design Phone Directory
• 359. Logger Rate Limiter
• 358. Rearrange String k Distance Apart
• 356. Line Reflection
• 355. Design Twitter
• 353. Design Snake Game
• 350. Intersection of Two Arrays II
• 349. Intersection of Two Arrays
• 348. Design Tic-Tac-Toe
• 347. Top K Frequent Elements
• 340. Longest Substring with At Most K Distinct Characters
• 336. Palindrome Pairs
• 325. Maximum Size Subarray Sum Equals k
• 314. Binary Tree Vertical Order Traversal
• 311. Sparse Matrix Multiplication
• 305. Number of Islands II
• 299. Bulls and Cows
• 291. Word Pattern II
• 290. Word Pattern
• 288. Unique Word Abbreviation
• 268. Missing Number
• 267. Palindrome Permutation II
• 266. Palindrome Permutation
• 264. Ugly Number II
• 249. Group Shifted Strings
• 246. Strobogrammatic Number
• 244. Shortest Word Distance II
• 242. Valid Anagram
• 229. Majority Element II
• 219. Contains Duplicate II
• 217. Contains Duplicate
• 208. Implement Trie (Prefix Tree)
• 205. Isomorphic Strings
• 202. Happy Number
• 187. Repeated DNA Sequences
• 170. Two Sum III - Data structure design
• 169. Majority Element
• 166. Fraction to Recurring Decimal
• 160. Intersection of Two Linked Lists
• 159. Longest Substring with At Most Two Distinct Characters
• 149. Max Points on a Line
• 146. LRU Cache
• 142. Linked List Cycle II
• 141. Linked List Cycle
• 140. Word Break II
• 139. Word Break
• 138. Copy List with Random Pointer
• 133. Clone Graph
• 128. Longest Consecutive Sequence
• 127. Word Ladder
• 126. Word Ladder II
• 106. Construct Binary Tree from Inorder and Postorder Traversal
• 105. Construct Binary Tree from Preorder and Inorder Traversal
• 76. Minimum Window Substring
• 73. Set Matrix Zeroes
• 49. Group Anagrams
• 41. First Missing Positive
• 37. Sudoku Solver
• 36. Valid Sudoku
• 30. Substring with Concatenation of All Words
• 17. Letter Combinations of a Phone Number
• 13. Roman to Integer
• 12. Integer to Roman
• 3. Longest Substring Without Repeating Characters
• 1. Two Sum

Ordered Set

• 3479. Fruits Into Baskets III
• 3408. Design Task Manager
• 3391. Design a 3D Binary Matrix with Efficient Layer Tracking
• 3369. Design an Array Statistics Tracker
• 3244. Shortest Distance After Road Addition Queries II
• 3109. Find the Index of Permutation
• 3102. Minimize Manhattan Distances
• 3092. Most Frequent IDs
• 3073. Maximum Increasing Triplet Value
• 2817. Minimum Absolute Difference Between Elements With Constraint
• 2763. Sum of Imbalance Numbers of All Subarrays
• 2762. Continuous Subarrays
• 2713. Maximum Strictly Increasing Cells in a Matrix
• 2659. Make Array Empty
• 2613. Beautiful Pairs
• 2612. Minimum Reverse Operations
• 2519. Count the Number of K-Big Indices
• 2426. Number of Pairs Satisfying Inequality
• 2424. Longest Uploaded Prefix
• 2382. Maximum Segment Sum After Removals
• 2363. Merge Similar Items
• 2353. Design a Food Rating System
• 2349. Design a Number Container System
• 2336. Smallest Number in Infinite Set
• 2276. Count Integers in Intervals
• 2254. Design Video Sharing Platform
• 2251. Number of Flowers in Full Bloom
• 2213. Longest Substring of One Repeating Character
• 2179. Count Good Triplets in an Array
• 2158. Amount of New Area Painted Each Day
• 2102. Sequentially Ordinal Rank Tracker
• 2035. Partition Array Into Two Arrays to Minimize Sum Difference
• 2034. Stock Price Fluctuation
• 2031. Count Subarrays With More Ones Than Zeros
• 2021. Brightest Position on Street
• 1912. Design Movie Rental System
• 1902. Depth of BST Given Insertion Order
• 1847. Closest Room
• 1825. Finding MK Average
• 1818. Minimum Absolute Sum Difference
• 1756. Design Most Recently Used Queue
• 1675. Minimize Deviation in Array
• 1649. Create Sorted Array through Instructions
• 1606. Find Servers That Handled Most Number of Requests
• 1438. Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit
• 1418. Display Table of Food Orders in a Restaurant
• 1348. Tweet Counts Per Frequency
• 975. Odd Even Jump
• 895. Maximum Frequency Stack
• 855. Exam Room
• 850. Rectangle Area II
• 732. My Calendar III
• 731. My Calendar II
• 729. My Calendar I
• 716. Max Stack
• 715. Range Module
• 699. Falling Squares
• 683. K Empty Slots
• 635. Design Log Storage System
• 497. Random Point in Non-overlapping Rectangles
• 493. Reverse Pairs
• 456. 132 Pattern
• 363. Max Sum of Rectangle No Larger Than K
• 352. Data Stream as Disjoint Intervals
• 327. Count of Range Sum
• 315. Count of Smaller Numbers After Self
• 220. Contains Duplicate III
• 218. The Skyline Problem

Rolling Hash

• 3292. Minimum Number of Valid Strings to Form Target II
• 3291. Minimum Number of Valid Strings to Form Target I
• 3045. Count Prefix and Suffix Pairs II
• 3042. Count Prefix and Suffix Pairs I
• 3037. Find Pattern in Infinite Stream II
• 3036. Number of Subarrays That Match a Pattern II
• 3034. Number of Subarrays That Match a Pattern I
• 3031. Minimum Time to Revert Word to Initial State II
• 3029. Minimum Time to Revert Word to Initial State I
• 3023. Find Pattern in Infinite Stream I
• 3008. Find Beautiful Indices in the Given Array II
• 3006. Find Beautiful Indices in the Given Array I
• 2430. Maximum Deletions on a String
• 2261. K Divisible Elements Subarrays
• 2223. Sum of Scores of Built Strings
• 2168. Unique Substrings With Equal Digit Frequency
• 2156. Find Substring With Given Hash Value
• 1960. Maximum Product of the Length of Two Palindromic Substrings
• 1923. Longest Common Subpath
• 1698. Number of Distinct Substrings in a String
• 1554. Strings Differ by One Character
• 1461. Check If a String Contains All Binary Codes of Size K
• 1392. Longest Happy Prefix
• 1316. Distinct Echo Substrings
• 1147. Longest Chunked Palindrome Decomposition
• 1062. Longest Repeating Substring
• 1044. Longest Duplicate Substring
• 718. Maximum Length of Repeated Subarray
• 214. Shortest Palindrome
• 187. Repeated DNA Sequences