Algorithms > Fundamental

Backtracking

• 3437. Permutations III
• 3376. Minimum Time to Break Locks I
• 3348. Smallest Divisible Digit Product II
• 3211. Generate Binary Strings Without Adjacent Zeros
• 2992. Number of Self-Divisible Permutations
• 2767. Partition String Into Minimum Beautiful Substrings
• 2708. Maximum Strength of a Group
• 2698. Find the Punishment Number of an Integer
• 2664. The Knight’s Tour
• 2597. The Number of Beautiful Subsets
• 2397. Maximum Rows Covered by Columns
• 2375. Construct Smallest Number From DI String
• 2305. Fair Distribution of Cookies
• 2212. Maximum Points in an Archery Competition
• 2178. Maximum Split of Positive Even Integers
• 2152. Minimum Number of Lines to Cover Points
• 2151. Maximum Good People Based on Statements
• 2065. Maximum Path Quality of a Graph
• 2056. Number of Valid Move Combinations On Chessboard
• 2048. Next Greater Numerically Balanced Number
• 2044. Count Number of Maximum Bitwise-OR Subsets
• 2014. Longest Subsequence Repeated k Times
• 2002. Maximum Product of the Length of Two Palindromic Subsequences
• 1986. Minimum Number of Work Sessions to Finish the Tasks
• 1980. Find Unique Binary String
• 1947. Maximum Compatibility Score Sum
• 1863. Sum of All Subset XOR Totals
• 1849. Splitting a String Into Descending Consecutive Values
• 1799. Maximize Score After N Operations
• 1774. Closest Dessert Cost
• 1723. Find Minimum Time to Finish All Jobs
• 1718. Construct the Lexicographically Largest Valid Sequence
• 1655. Distribute Repeating Integers
• 1601. Maximum Number of Achievable Transfer Requests
• 1593. Split a String Into the Max Number of Unique Substrings
• 1467. Probability of a Two Boxes Having The Same Number of Distinct Balls
• 1415. The k-th Lexicographical String of All Happy Strings of Length n
• 1307. Verbal Arithmetic Puzzle
• 1286. Iterator for Combination
• 1258. Synonymous Sentences
• 1255. Maximum Score Words Formed by Letters
• 1240. Tiling a Rectangle with the Fewest Squares
• 1239. Maximum Length of a Concatenated String with Unique Characters
• 1238. Circular Permutation in Binary Representation
• 1219. Path with Maximum Gold
• 1215. Stepping Numbers
• 1096. Brace Expansion II
• 1088. Confusing Number II
• 1087. Brace Expansion
• 1079. Letter Tile Possibilities
• 1066. Campus Bikes II
• 996. Number of Squareful Arrays
• 988. Smallest String Starting From Leaf
• 980. Unique Paths III
• 967. Numbers With Same Consecutive Differences
• 949. Largest Time for Given Digits
• 842. Split Array into Fibonacci Sequence
• 816. Ambiguous Coordinates
• 797. All Paths From Source to Target
• 784. Letter Case Permutation
• 773. Sliding Puzzle
• 698. Partition to K Equal Sum Subsets
• 691. Stickers to Spell Word
• 681. Next Closest Time
• 679. 24 Game
• 638. Shopping Offers
• 526. Beautiful Arrangement
• 494. Target Sum
• 491. Non-decreasing Subsequences
• 489. Robot Room Cleaner
• 473. Matchsticks to Square
• 465. Optimal Account Balancing
• 425. Word Squares
• 411. Minimum Unique Word Abbreviation
• 401. Binary Watch
• 357. Count Numbers with Unique Digits
• 351. Android Unlock Patterns
• 320. Generalized Abbreviation
• 306. Additive Number
• 301. Remove Invalid Parentheses
• 294. Flip Game II
• 291. Word Pattern II
• 282. Expression Add Operators
• 267. Palindrome Permutation II
• 257. Binary Tree Paths
• 254. Factor Combinations
• 216. Combination Sum III
• 212. Word Search II
• 140. Word Break II
• 131. Palindrome Partitioning
• 126. Word Ladder II
• 113. Path Sum II
• 95. Unique Binary Search Trees II
• 93. Restore IP Addresses
• 90. Subsets II
• 89. Gray Code
• 79. Word Search
• 78. Subsets
• 77. Combinations
• 52. N-Queens II
• 51. N-Queens
• 47. Permutations II
• 46. Permutations
• 40. Combination Sum II
• 39. Combination Sum
• 37. Sudoku Solver
• 22. Generate Parentheses
• 17. Letter Combinations of a Phone Number

Divide and Conquer

• 3165. Maximum Sum of Subsequence With Non-adjacent Elements
• 3109. Find the Index of Permutation
• 2792. Count Nodes That Are Great Enough
• 2613. Beautiful Pairs
• 2519. Count the Number of K-Big Indices
• 2426. Number of Pairs Satisfying Inequality
• 2407. Longest Increasing Subsequence II
• 2343. Query Kth Smallest Trimmed Number
• 2179. Count Good Triplets in an Array
• 2031. Count Subarrays With More Ones Than Zeros
• 1985. Find the Kth Largest Integer in the Array
• 1982. Find Array Given Subset Sums
• 1763. Longest Nice Substring
• 1738. Find Kth Largest XOR Coordinate Value
• 1649. Create Sorted Array through Instructions
• 1569. Number of Ways to Reorder Array to Get Same BST
• 1382. Balance a Binary Search Tree
• 1274. Number of Ships in a Rectangle
• 973. K Closest Points to Origin
• 932. Beautiful Array
• 918. Maximum Sum Circular Subarray
• 912. Sort an Array
• 889. Construct Binary Tree from Preorder and Postorder Traversal
• 654. Maximum Binary Tree
• 558. Logical OR of Two Binary Grids Represented as Quad-Trees
• 493. Reverse Pairs
• 427. Construct Quad Tree
• 395. Longest Substring with At Least K Repeating Characters
• 372. Super Pow
• 347. Top K Frequent Elements
• 327. Count of Range Sum
• 324. Wiggle Sort II
• 315. Count of Smaller Numbers After Self
• 240. Search a 2D Matrix II
• 218. The Skyline Problem
• 215. Kth Largest Element in an Array
• 191. Number of 1 Bits
• 190. Reverse Bits
• 169. Majority Element
• 148. Sort List
• 109. Convert Sorted List to Binary Search Tree
• 108. Convert Sorted Array to Binary Search Tree
• 106. Construct Binary Tree from Inorder and Postorder Traversal
• 105. Construct Binary Tree from Preorder and Inorder Traversal
• 53. Maximum Subarray
• 23. Merge k Sorted Lists
• 4. Median of Two Sorted Arrays

Greedy

• 3496. Maximize Score After Pair Deletions
• 3487. Maximum Unique Subarray Sum After Deletion
• 3476. Maximize Profit from Task Assignment
• 3474. Lexicographically Smallest Generated String
• 3464. Maximize the Distance Between Points on a Square
• 3462. Maximum Sum With at Most K Elements
• 3458. Select K Disjoint Special Substrings
• 3457. Eat Pizzas!
• 3449. Maximize the Minimum Game Score
• 3440. Reschedule Meetings for Maximum Free Time II
• 3439. Reschedule Meetings for Maximum Free Time I
• 3434. Maximum Frequency After Subarray Operation
• 3424. Minimum Cost to Make Arrays Identical
• 3413. Maximum Coins From K Consecutive Bags
• 3402. Minimum Operations to Make Columns Strictly Increasing
• 3397. Maximum Number of Distinct Elements After Operations
• 3362. Zero Array Transformation III
• 3357. Minimize the Maximum Adjacent Element Difference
• 3348. Smallest Divisible Digit Product II
• 3326. Minimum Division Operations to Make Array Non Decreasing
• 3302. Find the Lexicographically Smallest Valid Sequence
• 3301. Maximize the Total Height of Unique Towers
• 3296. Minimum Number of Seconds to Make Mountain Height Zero
• 3282. Reach End of Array With Max Score
• 3281. Maximize Score of Numbers in Ranges
• 3273. Minimum Amount of Damage Dealt to Bob
• 3260. Find the Largest Palindrome Divisible by K
• 3244. Shortest Distance After Road Addition Queries II
• 3229. Minimum Operations to Make Array Equal to Target
• 3228. Maximum Number of Operations to Move Ones to the End
• 3221. Maximum Array Hopping Score II
• 3219. Minimum Cost for Cutting Cake II
• 3218. Minimum Cost for Cutting Cake I
• 3216. Lexicographically Smallest String After a Swap
• 3207. Maximum Points After Enemy Battles
• 3205. Maximum Array Hopping Score I
• 3192. Minimum Operations to Make Binary Array Elements Equal to One II
• 3189. Minimum Moves to Get a Peaceful Board
• 3170. Lexicographically Minimum String After Removing Stars
• 3139. Minimum Cost to Equalize Array
• 3125. Maximum Number That Makes Result of Bitwise AND Zero
• 3119. Maximum Number of Potholes That Can Be Fixed
• 3111. Minimum Rectangles to Cover Points
• 3107. Minimum Operations to Make Median of Array Equal to K
• 3106. Lexicographically Smallest String After Operations With Constraint
• 3091. Apply Operations to Make Sum of Array Greater Than or Equal to k
• 3088. Make String Anti-palindrome
• 3086. Minimum Moves to Pick K Ones
• 3085. Minimum Deletions to Make String K-Special
• 3081. Replace Question Marks in String to Minimize Its Value
• 3075. Maximize Happiness of Selected Children
• 3074. Apple Redistribution into Boxes
• 3068. Find the Maximum Sum of Node Values
• 3049. Earliest Second to Mark Indices II
• 3035. Maximum Palindromes After Operations
• 3022. Minimize OR of Remaining Elements Using Operations
• 3016. Minimum Number of Pushes to Type Word II
• 3014. Minimum Number of Pushes to Type Word I
• 3012. Minimize Length of Array Using Operations
• 3002. Maximum Size of a Set After Removals
• 2971. Find Polygon With the Largest Perimeter
• 2967. Minimum Cost to Make Array Equalindromic
• 2966. Divide Array Into Arrays With Max Difference
• 2957. Remove Adjacent Almost-Equal Characters
• 2952. Minimum Number of Coins to be Added
• 2939. Maximum Xor Product
• 2938. Separate Black and White Balls
• 2931. Maximum Spending After Buying Items
• 2918. Minimum Equal Sum of Two Arrays After Replacing Zeros
• 2910. Minimum Number of Groups to Create a Valid Assignment
• 2900. Longest Unequal Adjacent Groups Subsequence I
• 2897. Apply Operations on Array to Maximize Sum of Squares
• 2895. Minimum Processing Time
• 2892. Minimizing Array After Replacing Pairs With Their Product
• 2871. Split Array Into Maximum Number of Subarrays
• 2870. Minimum Number of Operations to Make Array Empty
• 2868. The Wording Game
• 2864. Maximum Odd Binary Number
• 2856. Minimum Array Length After Pair Removals
• 2847. Smallest Number With Given Digit Product
• 2844. Minimum Operations to Make a Special Number
• 2842. Count K-Subsequences of a String With Maximum Beauty
• 2835. Minimum Operations to Form Subsequence With Target Sum
• 2834. Find the Minimum Possible Sum of a Beautiful Array
• 2829. Determine the Minimum Sum of a k-avoiding Array
• 2818. Apply Operations to Maximize Score
• 2813. Maximum Elegance of a K-Length Subsequence
• 2811. Check if it is Possible to Split Array
• 2800. Shortest String That Contains Three Strings
• 2790. Maximum Number of Groups With Increasing Length
• 2789. Largest Element in an Array after Merge Operations
• 2745. Construct the Longest New String
• 2734. Lexicographically Smallest String After Substring Operation
• 2712. Minimum Cost to Make All Characters Equal
• 2708. Maximum Strength of a Group
• 2706. Buy Two Chocolates
• 2697. Lexicographically Smallest Palindrome
• 2680. Maximum OR
• 2673. Make Costs of Paths Equal in a Binary Tree
• 2663. Lexicographically Smallest Beautiful String
• 2659. Make Array Empty
• 2656. Maximum Sum With Exactly K Elements
• 2645. Minimum Additions to Make Valid String
• 2616. Minimize the Maximum Difference of Pairs
• 2611. Mice and Cheese
• 2607. Make K-Subarray Sums Equal
• 2601. Prime Subtraction Operation
• 2600. K Items With the Maximum Sum
• 2599. Make the Prefix Sum Non-negative
• 2598. Smallest Missing Non-negative Integer After Operations
• 2592. Maximize Greatness of an Array
• 2591. Distribute Money to Maximum Children
• 2589. Minimum Time to Complete All Tasks
• 2587. Rearrange Array to Maximize Prefix Score
• 2578. Split With Minimum Sum
• 2576. Find the Maximum Number of Marked Indices
• 2573. Find the String with LCP
• 2571. Minimum Operations to Reduce an Integer to 0
• 2567. Minimum Score by Changing Two Elements
• 2566. Maximum Difference by Remapping a Digit
• 2561. Rearranging Fruits
• 2557. Maximum Number of Integers to Choose From a Range II
• 2554. Maximum Number of Integers to Choose From a Range I
• 2551. Put Marbles in Bags
• 2548. Maximum Price to Fill a Bag
• 2542. Maximum Subsequence Score
• 2541. Minimum Operations to Make Array Equal II
• 2530. Maximal Score After Applying K Operations
• 2528. Maximize the Minimum Powered City
• 2522. Partition String Into Substrings With Values at Most K
• 2517. Maximum Tastiness of Candy Basket
• 2499. Minimum Total Cost to Make Arrays Unequal
• 2498. Frog Jump II
• 2497. Maximum Star Sum of a Graph
• 2486. Append Characters to String to Make Subsequence
• 2472. Maximum Number of Non-overlapping Palindrome Substrings
• 2459. Sort Array by Moving Items to Empty Space
• 2457. Minimum Addition to Make Integer Beautiful
• 2449. Minimum Number of Operations to Make Arrays Similar
• 2448. Minimum Cost to Make Array Equal
• 2439. Minimize Maximum of Array
• 2436. Minimum Split Into Subarrays With GCD Greater Than One
• 2434. Using a Robot to Print the Lexicographically Smallest String
• 2429. Minimize XOR
• 2422. Merge Operations to Turn Array Into a Palindrome
• 2412. Minimum Money Required Before Transactions
• 2410. Maximum Matching of Players With Trainers
• 2406. Divide Intervals Into Minimum Number of Groups
• 2405. Optimal Partition of String
• 2389. Longest Subsequence With Limited Sum
• 2384. Largest Palindromic Number
• 2383. Minimum Hours of Training to Win a Competition
• 2375. Construct Smallest Number From DI String
• 2366. Minimum Replacements to Sort the Array
• 2358. Maximum Number of Groups Entering a Competition
• 2357. Make Array Zero by Subtracting Equal Amounts
• 2350. Shortest Impossible Sequence of Rolls
• 2340. Minimum Adjacent Swaps to Make a Valid Array
• 2335. Minimum Amount of Time to Fill Cups
• 2333. Minimum Sum of Squared Difference
• 2323. Find Minimum Time to Finish All Jobs II
• 2311. Longest Binary Subsequence Less Than or Equal to K
• 2310. Sum of Numbers With Units Digit K
• 2294. Partition Array Such That Maximum Difference Is K
• 2285. Maximum Total Importance of Roads
• 2279. Maximum Bags With Full Capacity of Rocks
• 2271. Maximum White Tiles Covered by a Carpet
• 2268. Minimum Number of Keypresses
• 2263. Make Array Non-decreasing or Non-increasing
• 2259. Remove Digit From Number to Maximize Result
• 2244. Minimum Rounds to Complete All Tasks
• 2241. Design an ATM Machine
• 2234. Maximum Total Beauty of the Gardens
• 2233. Maximum Product After K Increments
• 2224. Minimum Number of Operations to Convert Time
• 2216. Minimum Deletions to Make Array Beautiful
• 2214. Minimum Health to Beat Game
• 2208. Minimum Operations to Halve Array Sum
• 2207. Maximize Number of Subsequences in a String
• 2202. Maximize the Topmost Element After K Moves
• 2195. Append K Integers With Minimal Sum
• 2193. Minimum Number of Moves to Make Palindrome
• 2182. Construct String With Repeat Limit
• 2178. Maximum Split of Positive Even Integers
• 2171. Removing Minimum Number of Magic Beans
• 2170. Minimum Operations to Make the Array Alternating
• 2160. Minimum Sum of Four Digit Number After Splitting Digits
• 2144. Minimum Cost of Buying Candies With Discount
• 2141. Maximum Running Time of N Computers
• 2139. Minimum Moves to Reach Target Score
• 2136. Earliest Possible Day of Full Bloom
• 2132. Stamping the Grid
• 2131. Longest Palindrome by Concatenating Two Letter Words
• 2126. Destroying Asteroids
• 2116. Check if a Parentheses String Can Be Valid
• 2098. Subsequence of Size K With the Largest Even Sum
• 2091. Removing Minimum and Maximum From Array
• 2087. Minimum Cost Homecoming of a Robot in a Grid
• 2086. Minimum Number of Food Buckets to Feed the Hamsters
• 2078. Two Furthest Houses With Different Colors
• 2071. Maximum Number of Tasks You Can Assign
• 2064. Minimized Maximum of Products Distributed to Any Store
• 2038. Remove Colored Pieces if Both Neighbors are the Same Color
• 2037. Minimum Number of Moves to Seat Everyone
• 2030. Smallest K-Length Subsequence With Occurrences of a Letter
• 2029. Stone Game IX
• 2027. Minimum Moves to Convert String
• 2015. Average Height of Buildings in Each Segment
• 2014. Longest Subsequence Repeated k Times
• 2007. Find Original Array From Doubled Array
• 1996. The Number of Weak Characters in the Game
• 1989. Maximum Number of People That Can Be Caught in Tag
• 1975. Maximum Matrix Sum
• 1974. Minimum Time to Type Word Using Special Typewriter
• 1969. Minimum Non-Zero Product of the Array Elements
• 1968. Array With Elements Not Equal to Average of Neighbors
• 1963. Minimum Number of Swaps to Make the String Balanced
• 1962. Remove Stones to Minimize the Total
• 1953. Maximum Number of Weeks for Which You Can Work
• 1946. Largest Number After Mutating Substring
• 1936. Add Minimum Number of Rungs
• 1927. Sum Game
• 1921. Eliminate Maximum Number of Monsters
• 1903. Largest Odd Number in String
• 1899. Merge Triplets to Form Target Triplet
• 1888. Minimum Number of Flips to Make the Binary String Alternating
• 1881. Maximum Value after Insertion
• 1877. Minimize Maximum Pair Sum in Array
• 1874. Minimize Product Sum of Two Arrays
• 1864. Minimum Number of Swaps to Make the Binary String Alternating
• 1850. Minimum Adjacent Swaps to Reach the Kth Smallest Number
• 1846. Maximum Element After Decreasing and Rearranging
• 1838. Frequency of the Most Frequent Element
• 1833. Maximum Ice Cream Bars
• 1827. Minimum Operations to Make the Array Increasing
• 1824. Minimum Sideway Jumps
• 1802. Maximum Value at a Given Index in a Bounded Array
• 1798. Maximum Number of Consecutive Values You Can Make
• 1794. Count Pairs of Equal Substrings With Minimum Difference
• 1792. Maximum Average Pass Ratio
• 1788. Maximize the Beauty of the Garden
• 1785. Minimum Elements to Add to Form a Given Sum
• 1775. Equal Sum Arrays With Minimum Number of Operations
• 1764. Form Array by Concatenating Subarrays of Another Array
• 1754. Largest Merge Of Two Strings
• 1753. Maximum Score From Removing Stones
• 1739. Building Boxes
• 1736. Latest Time by Replacing Hidden Digits
• 1733. Minimum Number of People to Teach
• 1727. Largest Submatrix With Rearrangements
• 1717. Maximum Score From Removing Substrings
• 1713. Minimum Operations to Make a Subsequence
• 1710. Maximum Units on a Truck
• 1708. Largest Subarray Length K
• 1705. Maximum Number of Eaten Apples
• 1703. Minimum Adjacent Swaps for K Consecutive Ones
• 1702. Maximum Binary String After Change
• 1689. Partitioning Into Minimum Number Of Deci-Binary Numbers
• 1686. Stone Game VI
• 1675. Minimize Deviation in Array
• 1673. Find the Most Competitive Subsequence
• 1671. Minimum Number of Removals to Make Mountain Array
• 1665. Minimum Initial Energy to Finish Tasks
• 1663. Smallest String With A Given Numeric Value
• 1648. Sell Diminishing-Valued Colored Balls
• 1647. Minimum Deletions to Make Character Frequencies Unique
• 1642. Furthest Building You Can Reach
• 1606. Find Servers That Handled Most Number of Requests
• 1605. Find Valid Matrix Given Row and Column Sums
• 1589. Maximum Sum Obtained of Any Permutation
• 1585. Check If String Is Transformable With Substring Sort Operations
• 1580. Put Boxes Into the Warehouse II
• 1578. Minimum Time to Make Rope Colorful
• 1567. Maximum Length of Subarray With Positive Product
• 1564. Put Boxes Into the Warehouse I
• 1561. Maximum Number of Coins You Can Get
• 1558. Minimum Numbers of Function Calls to Make Target Array
• 1546. Maximum Number of Non-Overlapping Subarrays With Sum Equals Target
• 1541. Minimum Insertions to Balance a Parentheses String
• 1537. Get the Maximum Score
• 1536. Minimum Swaps to Arrange a Binary Grid
• 1529. Minimum Suffix Flips
• 1526. Minimum Number of Increments on Subarrays to Form a Target Array
• 1520. Maximum Number of Non-Overlapping Substrings
• 1509. Minimum Difference Between Largest and Smallest Value in Three Moves
• 1505. Minimum Possible Integer After at Most K Adjacent Swaps On Digits
• 1488. Avoid Flood in The City
• 1481. Least Number of Unique Integers after K Removals
• 1465. Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts
• 1433. Check If a String Can Break Another String
• 1432. Max Difference You Can Get From Changing an Integer
• 1414. Find the Minimum Number of Fibonacci Numbers Whose Sum Is K
• 1405. Longest Happy String
• 1403. Minimum Subsequence in Non-Increasing Order
• 1402. Reducing Dishes
• 1400. Construct K Palindrome Strings
• 1388. Pizza With 3n Slices
• 1386. Cinema Seat Allocation
• 1383. Maximum Performance of a Team
• 1382. Balance a Binary Search Tree
• 1363. Largest Multiple of Three
• 1353. Maximum Number of Events That Can Be Attended
• 1338. Reduce Array Size to The Half
• 1330. Reverse Subarray To Maximize Array Value
• 1328. Break a Palindrome
• 1326. Minimum Number of Taps to Open to Water a Garden
• 1323. Maximum 69 Number
• 1296. Divide Array in Sets of K Consecutive Numbers
• 1282. Group the People Given the Group Size They Belong To
• 1262. Greatest Sum Divisible by Three
• 1253. Reconstruct a 2-Row Binary Matrix
• 1247. Minimum Swaps to Make Strings Equal
• 1221. Split a String in Balanced Strings
• 1217. Minimum Cost to Move Chips to The Same Position
• 1199. Minimum Time to Build Blocks
• 1196. How Many Apples Can You Put into the Basket
• 1183. Maximum Number of Ones
• 1167. Minimum Cost to Connect Sticks
• 1147. Longest Chunked Palindrome Decomposition
• 1144. Decrease Elements To Make Array Zigzag
• 1130. Minimum Cost Tree From Leaf Values
• 1090. Largest Values From Labels
• 1081. Smallest Subsequence of Distinct Characters
• 1058. Minimize Rounding Error to Meet Target
• 1055. Shortest Way to Form String
• 1054. Distant Barcodes
• 1053. Previous Permutation With One Swap
• 1029. Two City Scheduling
• 1024. Video Stitching
• 1013. Partition Array Into Three Parts With Equal Sum
• 1007. Minimum Domino Rotations For Equal Row
• 1005. Maximize Sum Of Array After K Negations
• 991. Broken Calculator
• 984. String Without AAA or BBB
• 976. Largest Perimeter Triangle
• 969. Pancake Sorting
• 955. Delete Columns to Make Sorted II
• 954. Array of Doubled Pairs
• 948. Bag of Tokens
• 945. Minimum Increment to Make Array Unique
• 942. DI String Match
• 936. Stamping The Sequence
• 921. Minimum Add to Make Parentheses Valid
• 910. Smallest Range II
• 881. Boats to Save People
• 871. Minimum Number of Refueling Stops
• 870. Advantage Shuffle
• 861. Score After Flipping Matrix
• 860. Lemonade Change
• 857. Minimum Cost to Hire K Workers
• 846. Hand of Straights
• 826. Most Profit Assigning Work
• 807. Max Increase to Keep City Skyline
• 781. Rabbits in Forest
• 769. Max Chunks To Make Sorted
• 768. Max Chunks To Make Sorted II
• 767. Reorganize String
• 765. Couples Holding Hands
• 763. Partition Labels
• 757. Set Intersection Size At Least Two
• 738. Monotone Increasing Digits
• 714. Best Time to Buy and Sell Stock with Transaction Fee
• 680. Valid Palindrome II
• 678. Valid Parenthesis String
• 670. Maximum Swap
• 659. Split Array into Consecutive Subsequences
• 649. Dota2 Senate
• 646. Maximum Length of Pair Chain
• 632. Smallest Range Covering Elements from K Lists
• 630. Course Schedule III
• 625. Minimum Factorization
• 624. Maximum Distance in Arrays
• 621. Task Scheduler
• 611. Valid Triangle Number
• 605. Can Place Flowers
• 581. Shortest Unsorted Continuous Subarray
• 561. Array Partition
• 555. Split Concatenated Strings
• 527. Word Abbreviation
• 517. Super Washing Machines
• 502. IPO
• 484. Find Permutation
• 455. Assign Cookies
• 452. Minimum Number of Arrows to Burst Balloons
• 435. Non-overlapping Intervals
• 420. Strong Password Checker
• 410. Split Array Largest Sum
• 409. Longest Palindrome
• 402. Remove K Digits
• 397. Integer Replacement
• 376. Wiggle Subsequence
• 358. Rearrange String k Distance Apart
• 334. Increasing Triplet Subsequence
• 330. Patching Array
• 324. Wiggle Sort II
• 321. Create Maximum Number
• 316. Remove Duplicate Letters
• 280. Wiggle Sort
• 253. Meeting Rooms II
• 179. Largest Number
• 135. Candy
• 134. Gas Station
• 122. Best Time to Buy and Sell Stock II
• 55. Jump Game
• 45. Jump Game II
• 44. Wildcard Matching
• 11. Container With Most Water

Prefix Sum

• 3500. Minimum Cost to Divide Array Into Subarrays
• 3494. Find the Minimum Amount of Time to Brew Potions
• 3486. Longest Special Path II
• 3480. Maximize Subarrays After Removing One Conflicting Pair
• 3473. Sum of K Subarrays With Length at Least M
• 3445. Maximum Difference Between Even and Odd Frequency II
• 3434. Maximum Frequency After Subarray Operation
• 3432. Count Partitions with Even Sum Difference
• 3427. Sum of Variable Length Subarrays
• 3425. Longest Special Path
• 3413. Maximum Coins From K Consecutive Bags
• 3381. Maximum Subarray Sum With Length Divisible by K
• 3364. Minimum Positive Sum Subarray
• 3362. Zero Array Transformation III
• 3361. Shift Distance Between Two Strings
• 3356. Zero Array Transformation II
• 3355. Zero Array Transformation I
• 3354. Make Array Elements Equal to Zero
• 3347. Maximum Frequency of an Element After Performing Operations II
• 3346. Maximum Frequency of an Element After Performing Operations I
• 3333. Find the Original Typed String II
• 3312. Sorted GCD Pair Queries
• 3279. Maximum Total Area Occupied by Pistons
• 3261. Count Substrings That Satisfy K-Constraint II
• 3251. Find the Count of Monotonic Pairs II
• 3250. Find the Count of Monotonic Pairs I
• 3225. Maximum Score From Grid Operations
• 3224. Minimum Array Changes to Make Differences Equal
• 3212. Count Submatrices With Equal Frequency of X and Y
• 3191. Minimum Operations to Make Binary Array Elements Equal to One I
• 3179. Find the N-th Value After K Seconds
• 3152. Special Array II
• 3147. Taking Maximum Energy From the Mystic Dungeon
• 3130. Find All Possible Stable Binary Arrays II
• 3129. Find All Possible Stable Binary Arrays I
• 3104. Find Longest Self-Contained Substring
• 3096. Minimum Levels to Gain More Points
• 3086. Minimum Moves to Pick K Ones
• 3077. Maximum Strength of K Disjoint Subarrays
• 3070. Count Submatrices with Top-Left Element and Sum Less Than k
• 3028. Ant on the Boundary
• 3026. Maximum Good Subarray Sum
• 3017. Count the Number of Houses at a Certain Distance II
• 3015. Count the Number of Houses at a Certain Distance I
• 2983. Palindrome Rearrangement Queries
• 2971. Find Polygon With the Largest Perimeter
• 2968. Apply Operations to Maximize Frequency Score
• 2955. Number of Same-End Substrings
• 2950. Number of Divisible Substrings
• 2949. Count Beautiful Substrings II
• 2947. Count Beautiful Substrings I
• 2906. Construct Product Matrix
• 2875. Minimum Size Subarray in Infinite Array
• 2848. Points That Intersect With Cars
• 2845. Count of Interesting Subarrays
• 2838. Maximum Coins Heroes Can Collect
• 2819. Minimum Relative Loss After Buying Chocolates
• 2772. Apply Operations to Make All Array Elements Equal to Zero
• 2731. Movement of Robots
• 2681. Power of Heroes
• 2680. Maximum OR
• 2640. Find the Score of All Prefixes of an Array
• 2615. Sum of Distances
• 2602. Minimum Operations to Make All Array Elements Equal
• 2588. Count the Number of Beautiful Subarrays
• 2587. Rearrange Array to Maximize Prefix Score
• 2574. Left and Right Sum Differences
• 2559. Count Vowel Strings in Ranges
• 2552. Count Increasing Quadruplets
• 2536. Increment Submatrices by One
• 2528. Maximize the Minimum Powered City
• 2489. Number of Substrings With Fixed Ratio
• 2488. Count Subarrays With Median K
• 2485. Find the Pivot Integer
• 2483. Minimum Penalty for a Shop
• 2448. Minimum Cost to Make Array Equal
• 2439. Minimize Maximum of Array
• 2438. Range Product Queries of Powers
• 2428. Maximum Sum of an Hourglass
• 2420. Find All Good Indices
• 2406. Divide Intervals Into Minimum Number of Groups
• 2398. Maximum Number of Robots Within Budget
• 2391. Minimum Amount of Time to Collect Garbage
• 2389. Longest Subsequence With Limited Sum
• 2382. Maximum Segment Sum After Removals
• 2381. Shifting Letters II
• 2302. Count Subarrays With Score Less Than K
• 2281. Sum of Total Strength of Wizards
• 2271. Maximum White Tiles Covered by a Carpet
• 2270. Number of Ways to Split Array
• 2256. Minimum Average Difference
• 2251. Number of Flowers in Full Bloom
• 2245. Maximum Trailing Zeros in a Cornered Path
• 2237. Count Positions on Street With Required Brightness
• 2234. Maximum Total Beauty of the Gardens
• 2222. Number of Ways to Select Buildings
• 2219. Maximum Sum Score of Array
• 2218. Maximum Value of K Coins From Piles
• 2209. Minimum White Tiles After Covering With Carpets
• 2207. Maximize Number of Subsequences in a String
• 2171. Removing Minimum Number of Magic Beans
• 2145. Count the Hidden Sequences
• 2132. Stamping the Grid
• 2121. Intervals Between Identical Elements
• 2106. Maximum Fruits Harvested After at Most K Steps
• 2100. Find Good Days to Rob the Bank
• 2083. Substrings That Begin and End With the Same Letter
• 2055. Plates Between Candles
• 2025. Maximum Number of Ways to Partition an Array
• 2024. Maximize the Confusion of an Exam
• 2021. Brightest Position on Street
• 2017. Grid Game
• 1991. Find the Middle Index in Array
• 1983. Widest Pair of Indices With Equal Range Sum
• 1943. Describe the Painting
• 1930. Unique Length-3 Palindromic Subsequences
• 1915. Number of Wonderful Substrings
• 1895. Largest Magic Square
• 1894. Find the Student that Will Replace the Chalk
• 1893. Check if All the Integers in a Range Are Covered
• 1889. Minimum Space Wasted From Packaging
• 1878. Get Biggest Three Rhombus Sums in a Grid
• 1872. Stone Game VIII
• 1871. Jump Game VII
• 1862. Sum of Floored Pairs
• 1856. Maximum Subarray Min-Product
• 1854. Maximum Population Year
• 1838. Frequency of the Most Frequent Element
• 1829. Maximum XOR for Each Query
• 1788. Maximize the Beauty of the Garden
• 1769. Minimum Number of Operations to Move All Balls to Each Box
• 1744. Can You Eat Your Favorite Candy on Your Favorite Day?
• 1738. Find Kth Largest XOR Coordinate Value
• 1737. Change Minimum Characters to Satisfy One of Three Conditions
• 1732. Find the Highest Altitude
• 1712. Ways to Split Array Into Three Subarrays
• 1703. Minimum Adjacent Swaps for K Consecutive Ones
• 1687. Delivering Boxes from Storage to Ports
• 1685. Sum of Absolute Differences in a Sorted Array
• 1674. Minimum Moves to Make Array Complementary
• 1664. Ways to Make a Fair Array
• 1658. Minimum Operations to Reduce X to Zero
• 1590. Make Sum Divisible by P
• 1589. Maximum Sum Obtained of Any Permutation
• 1588. Sum of All Odd Length Subarrays
• 1546. Maximum Number of Non-Overlapping Subarrays With Sum Equals Target
• 1524. Number of Sub-arrays With Odd Sum
• 1508. Range Sum of Sorted Subarray Sums
• 1480. Running Sum of 1d Array
• 1444. Number of Ways of Cutting a Pizza
• 1442. Count Triplets That Can Form Two Arrays of Equal XOR
• 1423. Maximum Points You Can Obtain from Cards
• 1422. Maximum Score After Splitting a String
• 1420. Build Array Where You Can Find The Maximum Exactly K Comparisons
• 1413. Minimum Value to Get Positive Step by Step Sum
• 1371. Find the Longest Substring Containing Vowels in Even Counts
• 1352. Product of the Last K Numbers
• 1314. Matrix Block Sum
• 1310. XOR Queries of a Subarray
• 1292. Maximum Side Length of a Square with Sum Less than or Equal to Threshold
• 1248. Count Number of Nice Subarrays
• 1208. Get Equal Substrings Within Budget
• 1177. Can Make Palindrome from Substring
• 1140. Stone Game II
• 1124. Longest Well-Performing Interval
• 1109. Corporate Flight Bookings
• 1094. Car Pooling
• 1074. Number of Submatrices That Sum to Target
• 1004. Max Consecutive Ones III
• 1000. Minimum Cost to Merge Stones
• 995. Minimum Number of K Consecutive Bit Flips
• 974. Subarray Sums Divisible by K
• 930. Binary Subarrays With Sum
• 903. Valid Permutations for DI Sequence
• 862. Shortest Subarray with Sum at Least K
• 848. Shifting Letters
• 813. Largest Sum of Averages
• 798. Smallest Rotation with Highest Score
• 732. My Calendar III
• 731. My Calendar II
• 724. Find Pivot Index
• 713. Subarray Product Less Than K
• 689. Maximum Sum of 3 Non-Overlapping Subarrays
• 644. Maximum Average Subarray II
• 560. Subarray Sum Equals K
• 548. Split Array with Equal Sum
• 525. Contiguous Array
• 523. Continuous Subarray Sum
• 497. Random Point in Non-overlapping Rectangles
• 410. Split Array Largest Sum
• 370. Range Addition
• 363. Max Sum of Rectangle No Larger Than K
• 325. Maximum Size Subarray Sum Equals k
• 304. Range Sum Query 2D - Immutable
• 303. Range Sum Query - Immutable
• 253. Meeting Rooms II
• 238. Product of Array Except Self
• 209. Minimum Size Subarray Sum

Recursion

• 3483. Unique 3-Digit Even Numbers
• 3307. Find the K-th Character in String Game II
• 3304. Find the K-th Character in String Game I
• 2550. Count Collisions of Monkeys on a Polygon
• 2487. Remove Nodes From Linked List
• 1969. Minimum Non-Zero Product of the Array Elements
• 1922. Count Good Numbers
• 1823. Find the Winner of the Circular Game
• 1808. Maximize Number of Nice Divisors
• 1545. Find Kth Bit in Nth Binary String
• 1265. Print Immutable Linked List in Reverse
• 1106. Parsing A Boolean Expression
• 894. All Possible Full Binary Trees
• 779. K-th Symbol in Grammar
• 776. Split BST
• 772. Basic Calculator III
• 770. Basic Calculator IV
• 761. Special Binary String
• 736. Parse Lisp Expression
• 544. Output Contest Matches
• 509. Fibonacci Number
• 486. Predict the Winner
• 439. Ternary Expression Parser
• 394. Decode String
• 390. Elimination Game
• 342. Power of Four
• 326. Power of Three
• 273. Integer to English Words
• 255. Verify Preorder Sequence in Binary Search Tree
• 248. Strobogrammatic Number III
• 247. Strobogrammatic Number II
• 241. Different Ways to Add Parentheses
• 234. Palindrome Linked List
• 233. Number of Digit One
• 231. Power of Two
• 224. Basic Calculator
• 206. Reverse Linked List
• 203. Remove Linked List Elements
• 143. Reorder List
• 60. Permutation Sequence
• 50. Pow(x, n)
• 44. Wildcard Matching
• 25. Reverse Nodes in k-Group
• 24. Swap Nodes in Pairs
• 21. Merge Two Sorted Lists
• 10. Regular Expression Matching
• 2. Add Two Numbers

Sliding Window

• 3505. Minimum Operations to Make Elements Within K Subarrays Equal
• 3445. Maximum Difference Between Even and Odd Frequency II
• 3439. Reschedule Meetings for Maximum Free Time I
• 3422. Minimum Operations to Make Subarray Elements Equal
• 3420. Count Non-Decreasing Subarrays After K Operations
• 3413. Maximum Coins From K Consecutive Bags
• 3411. Maximum Subarray With Equal Products
• 3364. Minimum Positive Sum Subarray
• 3347. Maximum Frequency of an Element After Performing Operations II
• 3346. Maximum Frequency of an Element After Performing Operations I
• 3329. Count Substrings With K-Frequency Characters II
• 3325. Count Substrings With K-Frequency Characters I
• 3323. Minimize Connected Groups by Inserting Interval
• 3321. Find X-Sum of All K-Long Subarrays II
• 3318. Find X-Sum of All K-Long Subarrays I
• 3306. Count of Substrings Containing Every Vowel and K Consonants II
• 3305. Count of Substrings Containing Every Vowel and K Consonants I
• 3298. Count Substrings That Can Be Rearranged to Contain a String II
• 3297. Count Substrings That Can Be Rearranged to Contain a String I
• 3261. Count Substrings That Satisfy K-Constraint II
• 3258. Count Substrings That Satisfy K-Constraint I
• 3255. Find the Power of K-Size Subarrays II
• 3254. Find the Power of K-Size Subarrays I
• 3234. Count the Number of Substrings With Dominant Ones
• 3208. Alternating Groups II
• 3206. Alternating Groups I
• 3191. Minimum Operations to Make Binary Array Elements Equal to One I
• 3135. Equalize Strings by Adding or Removing Characters at Ends
• 3134. Find the Median of the Uniqueness Array
• 3097. Shortest Subarray With OR at Least K II
• 3095. Shortest Subarray With OR at Least K I
• 3090. Maximum Length Substring With Two Occurrences
• 3086. Minimum Moves to Pick K Ones
• 3037. Find Pattern in Infinite Stream II
• 3023. Find Pattern in Infinite Stream I
• 3013. Divide an Array Into Subarrays With Minimum Cost II
• 2982. Find Longest Special Substring That Occurs Thrice II
• 2981. Find Longest Special Substring That Occurs Thrice I
• 2968. Apply Operations to Maximize Frequency Score
• 2962. Count Subarrays Where Max Element Appears at Least K Times
• 2958. Length of Longest Subarray With at Most K Frequency
• 2953. Count Complete Substrings
• 2935. Maximum Strong Pair XOR II
• 2932. Maximum Strong Pair XOR I
• 2904. Shortest and Lexicographically Smallest Beautiful String
• 2902. Count of Sub-Multisets With Bounded Sum
• 2875. Minimum Size Subarray in Infinite Array
• 2841. Maximum Sum of Almost Unique Subarray
• 2831. Find the Longest Equal Subarray
• 2799. Count Complete Subarrays in an Array
• 2781. Length of the Longest Valid Substring
• 2779. Maximum Beauty of an Array After Applying Operation
• 2762. Continuous Subarrays
• 2760. Longest Even Odd Subarray With Threshold
• 2747. Count Zero Request Servers
• 2743. Count Substrings Without Repeating Character
• 2730. Find the Longest Semi-Repetitive Substring
• 2653. Sliding Subarray Beauty
• 2555. Maximize Win From Two Segments
• 2537. Count the Number of Good Subarrays
• 2528. Maximize the Minimum Powered City
• 2524. Maximum Frequency Score of a Subarray
• 2516. Take K of Each Character From Left and Right
• 2461. Maximum Sum of Distinct Subarrays With Length K
• 2444. Count Subarrays With Fixed Bounds
• 2411. Smallest Subarrays With Maximum Bitwise OR
• 2401. Longest Nice Subarray
• 2398. Maximum Number of Robots Within Budget
• 2379. Minimum Recolors to Get K Consecutive Black Blocks
• 2302. Count Subarrays With Score Less Than K
• 2271. Maximum White Tiles Covered by a Carpet
• 2269. Find the K-Beauty of a Number
• 2260. Minimum Consecutive Cards to Pick Up
• 2156. Find Substring With Given Hash Value
• 2134. Minimum Swaps to Group All 1's Together II
• 2107. Number of Unique Flavors After Sharing K Candies
• 2106. Maximum Fruits Harvested After at Most K Steps
• 2090. K Radius Subarray Averages
• 2067. Number of Equal Count Substrings
• 2024. Maximize the Confusion of an Exam
• 2009. Minimum Number of Operations to Make Array Continuous
• 1984. Minimum Difference Between Highest and Lowest of K Scores
• 1918. Kth Smallest Subarray Sum
• 1888. Minimum Number of Flips to Make the Binary String Alternating
• 1876. Substrings of Size Three with Distinct Characters
• 1871. Jump Game VII
• 1852. Distinct Numbers in Each Subarray
• 1839. Longest Substring Of All Vowels in Order
• 1838. Frequency of the Most Frequent Element
• 1763. Longest Nice Substring
• 1703. Minimum Adjacent Swaps for K Consecutive Ones
• 1695. Maximum Erasure Value
• 1658. Minimum Operations to Reduce X to Zero
• 1652. Defuse the Bomb
• 1610. Maximum Number of Visible Points
• 1499. Max Value of Equation
• 1493. Longest Subarray of 1's After Deleting One Element
• 1477. Find Two Non-overlapping Sub-arrays Each With Target Sum
• 1456. Maximum Number of Vowels in a Substring of Given Length
• 1438. Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit
• 1425. Constrained Subsequence Sum
• 1423. Maximum Points You Can Obtain from Cards
• 1358. Number of Substrings Containing All Three Characters
• 1343. Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold
• 1297. Maximum Number of Occurrences of a Substring
• 1248. Count Number of Nice Subarrays
• 1234. Replace the Substring for Balanced String
• 1208. Get Equal Substrings Within Budget
• 1176. Diet Plan Performance
• 1156. Swap For Longest Repeated Character Substring
• 1151. Minimum Swaps to Group All 1's Together
• 1100. Find K-Length Substrings With No Repeated Characters
• 1052. Grumpy Bookstore Owner
• 1044. Longest Duplicate Substring
• 1031. Maximum Sum of Two Non-Overlapping Subarrays
• 1004. Max Consecutive Ones III
• 995. Minimum Number of K Consecutive Bit Flips
• 992. Subarrays with K Different Integers
• 978. Longest Turbulent Subarray
• 930. Binary Subarrays With Sum
• 904. Fruit Into Baskets
• 862. Shortest Subarray with Sum at Least K
• 837. New 21 Game
• 727. Minimum Window Subsequence
• 718. Maximum Length of Repeated Subarray
• 713. Subarray Product Less Than K
• 689. Maximum Sum of 3 Non-Overlapping Subarrays
• 683. K Empty Slots
• 658. Find K Closest Elements
• 643. Maximum Average Subarray I
• 632. Smallest Range Covering Elements from K Lists
• 594. Longest Harmonious Subsequence
• 567. Permutation in String
• 487. Max Consecutive Ones II
• 480. Sliding Window Median
• 438. Find All Anagrams in a String
• 424. Longest Repeating Character Replacement
• 413. Arithmetic Slices
• 395. Longest Substring with At Least K Repeating Characters
• 340. Longest Substring with At Most K Distinct Characters
• 239. Sliding Window Maximum
• 220. Contains Duplicate III
• 219. Contains Duplicate II
• 209. Minimum Size Subarray Sum
• 187. Repeated DNA Sequences
• 159. Longest Substring with At Most Two Distinct Characters
• 76. Minimum Window Substring
• 30. Substring with Concatenation of All Words
• 3. Longest Substring Without Repeating Characters