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"For coding interview preparation, LeetCode is one of the best online resource providing a rich library of more than 300 real coding interview questions for you to practice from using one of the 7 supported languages - C, C++, Java, Python, C#, JavaScript, Ruby."

Algorithms

#TitleSolutionsVideoDifficultyTag
3178Find the Child Who Has the Ball After K SecondsJavaEasy
3175Find The First Player to win K Games in a RowJavaMedium
3174Clear DigitsJavaEasy
3164Find the Number of Good Pairs IIJavaMedium
3162Find the Number of Good Pairs IJavaEasy
3131Find the Integer Added to Array IJavaEasy
3127Make a Square with the Same ColorJavaEasy
3120Count the Number of Special Characters IJavaEasy
3046Split the ArrayJavaEasy
3042Count Prefix and Suffix Pairs IJavaEasy
3038Maximum Number of Operations With the Same Score IJavaEasy
3033Modify the MatrixJavaEasy
3006Find Beautiful Indices in the Given Array IJavaMedium
3005Count Elements With Maximum FrequencyJavaEasy
2716Minimize String LengthJava📺Easy
2710Remove Trailing Zeros From a StringJavaEasy
2706Buy Two ChocolatesJavaEasy
2696Minimum String Length After Removing SubstringsJavaEasy
2670Find the Distinct Difference ArrayJavaEasy
2596Check Knight Tour ConfigurationJava📺Medium
2595Number of Even and Odd BitsJavaEasy
2586Count the Number of Vowel Strings in RangeJavaEasy
2583Kth Largest Sum in a Binary TreeJavaMedium
2582Pass the PillowJavaEasy
2566Maximum Difference by Remapping a DigitJavaEasy
2562Find the Array Concatenation ValueJavaEasy
2559Count Vowel Strings in RangesJavaMedium
2558Take Gifts From the Richest PileJavaEasy
2554Maximum Number of Integers to Choose From a Range IJavaMedium
2553Separate the Digits in an ArrayJavaEasy
2549Count Distinct Numbers on BoardJavaEasy
2544Alternating Digit SumJava📺Easy
2540Minimum Common ValueJavaEasy
2536Increment Submatrices by OneJavaMedium
2535Difference Between Element Sum and Digit Sum of an ArrayJavaEasy
2530Maximal Score After Applying K OperationsJava📺Medium
2529Maximum Count of Positive Integer and Negative IntegerJava📺Easy
2525Categorize Box According to CriteriaJava📺Easy
2520Count the Digits That Divide a NumberJava📺Easy
2515Shortest Distance to Target String in a Circular ArrayJavaEasy
2496Maximum Value of a String in an ArrayJavaEasy
2467Convert the TemperatureJavaEasy
2455Average Value of Even Numbers That Are Divisible by ThreeJavaEasy
2433Find The Original Array of Prefix XorJava📺Medium
2432The Employee That Worked on the Longest TaskJavaEasy
2427Number of Common FactorsJavaEasy
2404Most Frequent Even ElementJavaEasy
2399Check Distances Between Same LettersJavaMedium
2395Find Subarrays With Equal SumJavaEasy
2380Time Needed to Rearrange a Binary StringJavaMedium
2379Minimum Recolors to Get K Consecutive Black BlocksJavaEasy
2373Largest Local Values in a MatrixJavaEasy
2367Number of Arithmetic TripletsJavaEasy
2363Merge Similar ItemsJavaEasy
2357Make Array Zero by Subtracting Equal AmountsJavaEasy
2352Equal Row and Column PairsJavaMedium
2351First Letter to Appear TwiceJavaEasy
2347Maximum Number of Pairs in ArrayJavaEasy
2341Maximum Number of Pairs in ArrayJavaEasy
2335Minimum Amount of Time to Fill CupsJavaEasy
2331Evaluate Boolean Binary TreeJavaEasy
2326Spiral Matrix IVJavaMedium
2325Decode the MessageJavaEasy
2319Check if Matrix Is X-MatrixJavaEasy
2315Count AsterisksJavaEasy
2309Greatest English Letter in Upper and Lower CaseJavaEasy
2303Calculate Amount Paid in TaxesJavaEasy
2299Strong Password Checker IIJavaEasy
2293Min Max GameJavaEasy
2288Apply Discount to PricesJavaMedium
2287Rearrange Characters to Make Target StringJavaEasy
2284Sender With Largest Word CountJavaMedium
2283Check if Number Has Equal Digit Count and Digit ValueJavaEasy
2279Maximum Bags With Full Capacity of RocksJavaMedium
2278Percentage of Letter in StringJavaEasy
2273Find Resultant Array After Removing AnagramsJavaEasy
2270Number of Ways to Split ArrayJavaMedium
2269Find the K-Beauty of a NumberJavaEasy
2264Largest 3-Same-Digit Number in StringJavaEasy
2260Minimum Consecutive Cards to Pick UpJavaMedium
2259Remove Digit From Number to Maximize ResultJavaEasy
2256Minimum Average DifferenceJavaMedium
2255Count Prefixes of a Given StringJavaEasy
2248Intersection of Multiple ArraysJavaEasy
2244Minimum Rounds to Complete All TasksJavaMedium
2243Calculate Digit Sum of a StringJavaEasy
2239Find Closest Number to ZeroJavaEasy
2236Root Equals Sum of ChildrenJavaEasy
2235Add Two IntegersJava📺Easy
2231Largest Number After Digit Swaps by ParityJavaEasy
2229Check if an Array Is ConsecutiveJavaEasy
2224Minimum Number of Operations to Convert TimeJavaEasy
2220Minimum Bit Flips to Convert NumberJavaEasy
2215Find the Difference of Two ArraysJavaEasy
2210Count Hills and Valleys in an ArrayJavaEasy
2208Minimum Operations to Halve Array SumJavaMedium
2206Divide Array Into Equal PairsJavaEasy
2201Count Artifacts That Can Be ExtractedJavaMedium
2200Find All K-Distant Indices in an ArrayJavaEasy
2194Cells in a Range on an Excel SheetJavaEasy
2190Most Frequent Number Following Key In an ArrayJavaEasy
2186Minimum Number of Steps to Make Two Strings Anagram IIJavaMedium
2185Counting Words With a Given PrefixJavaEasy
2182Construct String With Repeat LimitJavaMedium
2181Merge Nodes in Between ZerosJavaMedium
2180Count Integers With Even Digit SumJavaEasy
2177Find Three Consecutive Integers That Sum to a Given NumberJavaMedium
2176Count Equal and Divisible Pairs in an ArrayJavaEasy
2169Count Operations to Obtain ZeroJavaEasy
2166Design BitsetJavaMedium
2165Smallest Value of the Rearranged NumberJavaMedium
2164Sort Even and Odd Indices IndependentlyJavaEasy
2161Partition Array According to Given PivotJavaMedium
2160Minimum Sum of Four Digit Number After Splitting DigitsJavaEasy
2156Find Substring With Given Hash ValueJavaMedium
2155All Divisions With the Highest Score of a Binary ArrayJavaMedium
2154Keep Multiplying Found Values by TwoJavaEasy
2150Find All Lonely Numbers in the ArrayJavaMedium
2149Rearrange Array Elements by SignJavaMedium
2148Count Elements With Strictly Smaller and Greater ElementsJavaEasy
2144Minimum Cost of Buying Candies With DiscountJavaEasy
2139Minimum Moves to Reach Target ScoreJavaMedium
2138Divide a String Into Groups of Size kJavaEasy
2134Minimum Swaps to Group All 1's Together IIJavaMedium
2133Check if Every Row and Column Contains All NumbersJavaEasy
2130Maximum Twin Sum of a Linked ListJavaMedium
2129Capitalize the TitleJavaEasy
2126Destroying AsteroidsJavaMedium
2125Number of Laser Beams in a BankJavaMedium
2124Check if All A's Appears Before All B'sJavaEasy
2120Execution of All Suffix Instructions Staying in a GridJavaMedium
2119A Number After a Double ReversalJavaEasy
2116Check if a Parentheses String Can Be ValidJavaMedium
2114Maximum Number of Words Found in SentencesJavaEasy
2110Number of Smooth Descent Periods of a StockJavaMedium
2109Adding Spaces to a StringJavaMedium
2108Find First Palindromic String in the ArrayJavaEasy
2103Rings and RodsJavaEasy
2099Find Subsequence of Length K With the Largest SumJavaEasy
2095Delete the Middle Node of a Linked ListJavaMedium
2094Finding 3-Digit Even NumbersJavaEasy
2091Removing Minimum and Maximum From ArrayJavaMedium
2090K Radius Subarray AveragesJavaMedium
2089Find Target Indices After Sorting ArrayJavaEasy
2086Minimum Number of Buckets Required to Collect Rainwater from HousesJavaMedium
2085Count Common Words With One OccurrenceJavaEasy
2080Range Frequency QueriesJavaMediumArray, Binary Search
2079Watering PlantsJavaMedium
2078Two Furthest Houses With Different ColorsJavaEasy
2076Process Restricted Friend RequestsJavaHard
2075Decode the Slanted CiphertextJavaMedium
2074Reverse Nodes in Even Length GroupsJavaMedium
2073Time Needed to Buy TicketsJavaEasy
2070Most Beautiful Item for Each QueryJavaMedium
2068Check Whether Two Strings are Almost EquivalentJavaEasy
2063Vowels of All SubstringsJavaMedium
2062Count Vowel Substrings of a StringJavaEasy
2058Find the Minimum and Maximum Number of Nodes Between Critical PointsJavaMedium
2057Smallest Index With Equal ValueJavaEasy
2055Plates Between CandlesJavaMedium
2054Two Best Non-Overlapping EventsJavaMedium
2053Kth Distinct String in an ArrayJavaEasy
2050Parallel Courses IIIJavaHard
2048Next Greater Numerically Balanced NumberJavaMedium
2047Number of Valid Words in a SentenceJavaEasy
2044Count Number of Maximum Bitwise-OR SubsetsJavaMedium
2043Simple Bank SystemJavaMedium
2042Check if Numbers Are Ascending in a SentenceJavaEasy
2039The Time When the Network Becomes IdleJavaMedium
2038Remove Colored Pieces if Both Neighbors are the Same ColorJavaMedium
2037Minimum Number of Moves to Seat EveryoneJavaEasy
2034Stock Price FluctuationJavaMedium
2033Minimum Operations to Make a Uni-Value GridJavaMedium
2032Two Out of ThreeJavaEasy
2028Find Missing ObservationsJavaMedium
2027Minimum Moves to Convert StringJavaEasy
2024Maximize the Confusion of an ExamJavaMedium
2023Number of Pairs of Strings With Concatenation Equal to TargetJavaMedium
2022Convert 1D Array Into 2D ArrayJavaEasy
2018Check if Word Can Be Placed In CrosswordJavaMedium
2017Grid GameJavaMediumArray, Matrix, Prefix Sum
2016Maximum Difference Between Increasing ElementsJavaEasy
2012Sum of Beauty in the ArrayJavaMedium
2011Final Value of Variable After Performing OperationsJavaEasy
2007Find Original Array From Doubled ArrayJavaMedium
2006Count Number of Pairs With Absolute Difference KJavaEasy
2001Number of Pairs of Interchangeable RectanglesPython3,JavaMedium
2000Reverse Prefix of WordSolutionEasy
1996The Number of Weak Characters in the GameSolutionMedium
1995Count Special QuadrupletsSolutionEasy
1992Find All Groups of FarmlandSolutionMedium
1991Find the Middle Index in ArraySolutionEasy
1985Find the Kth Largest Integer in the ArraySolutionMedium
1984Minimum Difference Between Highest and Lowest of K ScoresSolutionEasy
1981Minimize the Difference Between Target and Chosen ElementsSolutionMediumDP
1980Find Unique Binary StringSolutionMedium
1979Find Greatest Common Divisor of ArraySolutionEasy
1974Minimum Time to Type Word Using Special TypewriterSolutionEasy
1971Find if Path Exists in GraphSolutionEasyBFS, DFS, Graph
1968Array With Elements Not Equal to Average of NeighborsSolutionMedium
1967Number of Strings That Appear as Substrings in WordSolutionEasy
1966Binary Searchable Numbers in an Unsorted ArraySolutionMediumArray, Binary Search
1961Check If String Is a Prefix of ArraySolutionEasy
1957Delete Characters to Make Fancy StringSolutionEasyString
1952Three DivisorsSolutionEasy
1945Sum of Digits of String After ConvertSolutionEasy
1941Check if All Characters Have Equal Number of OccurrencesSolutionEasy
1936Add Minimum Number of RungsSolutionMedium
1935Maximum Number of Words You Can TypeSolutionEasyString
1933Check if String Is Decomposable Into Value-Equal SubstringsSolutionEasyString
1929Concatenation of ArraySolutionEasy
1926Nearest Exit from Entrance in MazeSolutionMediumDP, DFS, BFS
1925Count Square Sum TriplesSolutionEasyArray, Greedy
1920Build Array from PermutationSolutionEasy
1913Maximum Product Difference Between Two PairsSolutionEasySort
1910Remove All Occurrences of a SubstringSolution📺MediumString
1909Remove One Element to Make the Array Strictly IncreasingSolutionEasyArray
1904The Number of Full Rounds You Have PlayedSolutionMediumString, Greedy
1903Largest Odd Number in StringSolution📺EasyGreedy
1897Redistribute Characters to Make All Strings EqualSolutionEasyString, Greedy
1893Check if All the Integers in a Range Are CoveredSolutionEasyArray, HashTable, Prefix Sum
1891Cutting RibbonsSolutionMediumArray, Binary Search
1886Determine Whether Matrix Can Be Obtained By RotationSolutionEasyArray
1880Check if Word Equals Summation of Two WordsSolutionEasyString
1877Minimize Maximum Pair Sum in ArraySolutionMediumGreedy, Sort
1876Substrings of Size Three with Distinct CharactersSolutionEasyString
1874Minimize Product Sum of Two ArraysSolutionMediumArray, Greedy, Sorting
1869Longer Contiguous Segments of Ones than ZerosSolutionEasyArray, Two Pointers
1868Product of Two Run-Length Encoded ArraysSolutionMediumTwo Pointers
1863Sum of All Subset XOR TotalsSolutionEasyBacktracking, Recursion
1862Sum of Floored PairsSolutionHardMath
1861Rotating the BoxSolution📺MediumArray, Two Pointers
1860Incremental Memory LeakSolutionMediumMath
1859Sorting the SentenceSolutionEasyString, Sort
1854Maximum Population YearSolutionEasyArray
1848Minimum Distance to the Target ElementSolutionEasyArray
1845Seat Reservation ManagerSolutionMediumHeap, Design
1844Replace All Digits with CharactersSolutionEasyString
1837Sum of Digits in Base KSolutionEasyMath, Bit Manipulation
1836Remove Duplicates From an Unsorted Linked ListSolutionMediumHashTable, LinkedList
1833Maximum Ice Cream BarsSolutionMediumArray, Sort
1832Check if the Sentence Is PangramSolutionEasyString
1829Maximum XOR for Each QuerySolutionMediumBit Manipulation
1828Queries on Number of Points Inside a CircleSolution📺MediumMath
1827Minimum Operations to Make the Array IncreasingSolutionEasyArray, Greedy
1826Faulty SensorSolutionEasyArray, Two Pointers
1823Find the Winner of the Circular GameSolutionMediumArray
1822Sign of the Product of an ArraySolutionEasyMath
1817Finding the Users Active MinutesSolutionMediumHashTable
1816Truncate SentenceSolutionEasyString
1814Count Nice Pairs in an ArraySolutionMediumArray, HashTable
1813Sentence Similarity IIISolution📺MediumString
1812Determine Color of a Chessboard SquareSolutionEasyString
1807Evaluate the Bracket Pairs of a StringSolutionMediumHashTable, String
1806Minimum Number of Operations to Reinitialize a PermutationSolutionMediumArray, Greedy
1805Number of Different Integers in a StringSolutionMediumString
1804Implement Trie II (Prefix Tree)SolutionMediumTrie, Design
1800Maximum Ascending Subarray SumSolutionEasyTwo Pointers
1797Design Authentication ManagerSolutionMediumHashTable, Design
1796Second Largest Digit in a StringSolutionEasyString
1792Maximum Average Pass RatioSolutionMediumHeap
1791Find Center of Star GraphSolutionMediumGraph
1790Check if One String Swap Can Make Strings EqualSolutionEasyString
1785Minimum Elements to Add to Form a Given SumSolutionMediumGreedy
1784Check if Binary String Has at Most One Segment of OnesSolutionEasyGreedy
1781Sum of Beauty of All SubstringsSolutionMediumHashTable, String
1780Check if Number is a Sum of Powers of ThreeSolutionMediumMath, Backtracking, Recursion
1779Find Nearest Point That Has the Same X or Y CoordinateSolutionEasyArray
1775Equal Sum Arrays With Minimum Number of OperationsSolutionMediumGreedy
1774Closest Dessert CostSolutionMediumGreedy
1773Count Items Matching a RuleSolution📺EasyArray, String
1772Sort Features by PopularitySolution📺MediumHashTable, Sort
1769Minimum Number of Operations to Move All Balls to Each BoxSolutionMediumArray, Greedy
1768Merge Strings AlternatelySolutionEasyString
1765Map of Highest PeakSolutionMediumBFS, Graph
1764Form Array by Concatenating Subarrays of Another ArraySolutionMediumArray, Greedy
1763Longest Nice SubstringSolutionEasyString
1762Buildings With an Ocean ViewSolutionMedium
1759Count Number of Homogenous SubstringsSolutionMediumString ,Greedy
1758Minimum Changes To Make Alternating Binary StringSolutionEasyGreedy, Array
1756Design Most Recently Used QueueSolutionMediumArray, Design, Dequeue
1754Largest Merge Of Two StringsSolutionMediumGreedy, Suffix Array
1753Maximum Score From Removing StonesSolutionMediumMath, Heap
1752Check if Array Is Sorted and RotatedSolutionEasyArray
1750Minimum Length of String After Deleting Similar EndsSolutionMediumTwo Pointers
1749Maximum Absolute Sum of Any SubarraySolutionMediumGreedy
1748Sum of Unique ElementsSolutionEasyArray, HashTable
1746Maximum Subarray Sum After One OperationSolutionMediumDP
1745Palindrome Partitioning IVSolutionHardString, DP
1743Restore the Array From Adjacent PairsSolutionMediumGreedy
1742Maximum Number of Balls in a BoxSolutionEasyArray
1736Latest Time by Replacing Hidden DigitsSolutionEasyString, Greedy
1733Minimum Number of People to TeachSolutionMediumArray, Greedy
1732Find the Highest AltitudeSolutionEasyArray
1727Largest Submatrix With RearrangementsSolutionMediumGreedy, Sort
1726Tuple with Same ProductSolution📺MediumArray
1725Number Of Rectangles That Can Form The Largest SquareSolutionEasyGreedy
1721Swapping Nodes in a Linked ListSolutionMediumLinkedList
1720Decode XORed ArraySolutionEasyBit Manipulation
1718Construct the Lexicographically Largest Valid SequenceSolutionMediumBacktracking, Recursion
1717Maximum Score From Removing SubstringsSolution📺MediumGreedy
1716Calculate Money in Leetcode BankSolutionEasyMath, Greedy
1711Count Good MealsSolutionMediumArray, HashTable, Two Pointers
1710Maximum Units on a TruckSolutionEasyGreedy, Sort
1708Largest Subarray Length KSolutionEasyArray, Greedy
1705Maximum Number of Eaten ApplesSolutionMediumHeap, Greedy
1704Determine if String Halves Are AlikeSolutionEasyString
1700Number of Students Unable to Eat LunchSolutionEasyArray
1695Maximum Erasure ValueSolutionMediumTwo Pointers
1694Reformat Phone NumberSolutionEasyString
1690Stone Game VIISolutionMediumDP
1689Partitioning Into Minimum Number Of Deci-Binary NumbersSolutionMediumGreedy
1688Count of Matches in TournamentSolutionEasyBacktracking
1686Stone Game VISolutionMediumGreedy
1685Sum of Absolute Differences in a Sorted ArraySolution📺MediumMath, Greedy
1684Count the Number of Consistent StringsSolutionEasyString
1680Concatenation of Consecutive Binary NumbersSolutionMediumMath
1679Max Number of K-Sum PairsSolutionMediumHashTable
1678Goal Parser InterpretationSolutionEasyString
1676Lowest Common Ancestor of a Binary Tree IVSolutionMediumTree, DFS, Binary Tree
1675Minimize Deviation in ArraySolutionHardHeap, Ordered Map
1673Find the Most Competitive SubsequenceSolution📺MediumStack, Greedy
1672Richest Customer WealthSolutionEasyArray
1670Design Front Middle Back QueueSolutionMediumLinked List, Design, Dequeu
1669Merge In Between Linked ListsSolutionMediumLinedList
1668Maximum Repeating SubstringSolutionEasyString
1664Ways to Make a Fair ArrayJavascriptMediumGreedy
1663Smallest String With A Given Numeric ValueSolution📺MediumGreedy
1662Check If Two String Arrays are EquivalentSolutionEasyString
1658Minimum Operations to Reduce X to ZeroJavascript,JavaMediumGreedy
1657Determine if Two Strings Are CloseSolution📺MediumGreedy
1656Design an Ordered StreamSolutionEasyArray, Design
1652Defuse the BombSolutionEasyArray
1650Lowest Common Ancestor of a Binary Tree IIISolutionMediumHashTable, Binary Tree, Tree
1646Get Maximum in Generated ArraySolutionEasyArray
1644Lowest Common Ancestor of a Binary Tree IISolutionMediumBinary Tree, DFS
1642Furthest Building You Can ReachSolutionMediumBinary Search, Heap
1641Count Sorted Vowel StringsSolution📺MediumMath, DP, Backtracking
1640Check Array Formation Through ConcatenationSolutionEasyArray, Sort
1637Widest Vertical Area Between Two Points Containing No PointsJavascript,JavaMediumSort
1636Sort Array by Increasing FrequencySolutionEasyArray, Sort
1630Arithmetic SubarraysSolutionMediumSort
1629Slowest KeySolutionEasyArray
1628Design an Expression Tree With Evaluate FunctionSolutionMediumStack, Binary Tree, Design, Math
1626Best Team With No ConflictsSolutionMediumDP
1625Lexicographically Smallest String After Applying OperationsSolutionMediumBFS, DFS
1624Largest Substring Between Two Equal CharactersSolution📺EasyString
1620Coordinate With Maximum Network QualitySolution📺MediumGreedy
1619Mean of Array After Removing Some ElementsSolution📺EasyArray
1614Maximum Nesting Depth of the ParenthesesSolutionEasyString
1609Even Odd TreeSolutionMediumTree
1608Special Array With X Elements Greater Than or Equal XSolutionEasyArray
1604Alert Using Same Key-Card Three or More Times in a One Hour PeriodSolutionMediumString, Ordered Map
1603Design Parking SystemSolutionEasyDesign
1601Maximum Number of Achievable Transfer RequestsSolutionHardBacktracking
1598Crawler Log FolderSolutionEasyStack
1592Rearrange Spaces Between WordsSolutionEasyString
1588Sum of All Odd Length SubarraysSolutionEasyArray
1583Count Unhappy FriendsSolutionMediumArray
1582Special Positions in a Binary MatrixSolutionEasyArray
1577Number of Ways Where Square of Number Is Equal to Product of Two NumbersSolutionMediumHashTable, Math
1576Replace All ?'s to Avoid Consecutive Repeating CharactersSolution📺EasyString
1574Shortest Subarray to be Removed to Make Array SortedSolutionMediumArray, Binary Search
1572Matrix Diagonal SumSolutionEasyArray
1570Dot Product of Two Sparse VectorsSolutionEasyArray, HashTable, Two Pointers
1567Maximum Length of Subarray With Positive ProductSolution📺MediumGreedy
1566Detect Pattern of Length M Repeated K or More TimesSolution📺EasyArray
1561Maximum Number of Coins You Can GetSolution📺MediumSort
1560Most Visited Sector in a Circular TrackSolutionEasyArray
1558Minimum Numbers of Function Calls to Make Target ArraySolutionMediumGreedy
1557Minimum Number of Vertices to Reach All NodesSolution📺MediumGraph
1556Thousand SeparatorSolution📺EasyString
1551Minimum Operations to Make Array EqualSolution📺MediumMath
1550Three Consecutive OddsSolutionEasyArray
1545Find Kth Bit in Nth Binary StringSolution📺MediumString
1544Make The String GreatSolution📺EasyString, Stack
1541Minimum Insertions to Balance a Parentheses StringSolution📺MediumString, Stack
1539Kth Missing Positive NumberSolution📺EasyArray, HashTable
1535Find the Winner of an Array GameSolution📺MediumArray
1534Count Good TripletsSolutionEasyArray
1528Shuffle StringSolutionEasySort
1526Minimum Number of Increments on Subarrays to Form a Target ArraySolutionHardSegment Tree
1525Number of Good Ways to Split a StringSolution📺MediumString, Bit Manipulation
1524Number of Sub-arrays With Odd SumSolutionMediumArray, Math
1523Count Odd Numbers in an Interval RangeSolution📺EasyMath
1518Water BottlesSolutionEasyGreedy
1514Path with Maximum ProbabilitySolutionMediumGraph
1512Number of Good PairsSolutionEasyArray, HashTable, Math
1508Range Sum of Sorted Subarray SumsSolutionMediumArray, Sort
1507Reformat DateSolutionEasyString
1502Can Make Arithmetic Progression From SequenceSolutionEasyArray, Sort
1496Path CrossingSolutionEasyString
1493Longest Subarray of 1's After Deleting One ElementSolution📺MediumArray
1492The kth Factor of nSolutionMediumMath
1491Average Salary Excluding the Minimum and Maximum SalarySolutionEasyArray, Sort
1490Clone N-ary TreeSolution📺MediumHashTable, Tree, DFS, BFS
1487Making File Names UniqueSolutionMediumHashTable, String
1486XOR Operation in an ArraySolutionMediumArray, Bit Manipulation
1485Clone Binary Tree With Random PointerSolutionMediumHashTable, Tree, DFS, BFS
1482Minimum Number of Days to Make m BouquetsSolutionMediumArray, Binary Search
1481Least Number of Unique Integers after K RemovalsSolutionMediumArray, Sort
1480Running Sum of 1d ArraySolution,C++EasyArray
1476Subrectangle QueriesSolutionMediumArray
1475Final Prices With a Special Discount in a ShopSolutionEasyArray
1474Delete N Nodes After M Nodes of a Linked ListSolutionEasyLinkedList
1472Design Browser HistorySolutionMediumArray, Design
1471The k Strongest Values in an ArraySolutionMediumArray, Sort
1470Shuffle the ArraySolution,C++EasyArray
1469Find All The Lonely NodesSolutionEasyTree, DFS
1466Reorder Routes to Make All Paths Lead to the City ZeroSolutionMediumTree, DFS, BFS
1464Maximum Product of Two Elements in an ArraySolutionEasyArray
1461Check If a String Contains All Binary Codes of Size KSolutionMediumString, Bit Manipulation
1460Make Two Arrays Equal by Reversing Sub-arraysSolutionEasyArray
1457Pseudo-Palindromic Paths in a Binary TreeSolutionMediumBit Manipulation, Tree, DFS
1456Maximum Number of Vowels in a Substring of Given LengthSolutionMediumString, Sliding Window
1455Check If a Word Occurs As a Prefix of Any Word in a SentenceSolutionEasyString
1452People Whose List of Favorite Companies Is Not a Subset of Another ListSolutionMediumString, Sort
1451Rearrange Words in a SentenceSolutionMediumString, Sort
1450Number of Students Doing Homework at a Given TimeSolutionEasyArray
1448Count Good Nodes in Binary TreeSolutionMediumTree, DFS
1447Simplified FractionsSolutionMediumMath
1446Consecutive CharactersSolutionEasyString
1441Build an Array With Stack OperationsSolutionEasyStack
1439Find the Kth Smallest Sum of a Matrix With Sorted RowsSolutionHardArray, Binary Search, PriorityQueue, Matrix
1438Longest Continuous Subarray With Absolute Diff Less Than or Equal to LimitSolutionMediumArray, Queue, Sliding Window, PriorityQueue, Monotonic Queue
1437Check If All 1's Are at Least Length K Places AwaySolutionMediumArray
1436Destination CitySolutionEasyString
1432Max Difference You Can Get From Changing an IntegerSolutionMediumString
1431Kids With the Greatest Number of CandiesSolution,C++EasyArray
1429First Unique NumberSolutionMediumArray, HashTable, Design, Data Streams
1428Leftmost Column with at Least a OneSolutionMediumArray
1427Perform String ShiftsSolutionEasyArray, Math
1426Counting ElementsSolutionEasyArray
1423Maximum Points You Can Obtain from CardsSolutionMediumArray, DP, Sliding Window
1422Maximum Score After Splitting a StringSolutionEasyString
1418Display Table of Food Orders in a RestaurantSolutionMediumHashTable
1417Reformat The StringSolutionEasyString
1415The k-th Lexicographical String of All Happy Strings of Length nSolutionMediumBacktracking
1413Minimum Value to Get Positive Step by Step SumSolutionEasyArray
1410HTML Entity ParserSolutionMediumString, Stack
1409Queries on a Permutation With KeySolutionMediumArray
1408String Matching in an ArraySolutionEasyString
1403Minimum Subsequence in Non-Increasing OrderSolutionEasyGreedy, Sort
1402Reducing DishesSolutionHardDynamic Programming
1401Circle and Rectangle OverlappingSolutionMediumGeometry
1400Construct K Palindrome StringsSolutionMediumGreedy
1399Count Largest GroupSolutionEasyArray
1396Design Underground SystemSolutionMediumDesign
1395Count Number of TeamsSolutionMediumArray
1394Find Lucky Integer in an ArraySolutionEasyArray
1392Longest Happy PrefixSolutionHardString, Rolling Hash
1390Four DivisorsSolutionMediumMath
1389Create Target Array in the Given OrderSolutionEasyArray
1388Pizza With 3n SlicesSolutionHardDP
1387Sort Integers by The Power ValueSolutionMediumSort, Graph
1386Cinema Seat AllocationSolutionMediumArray, Greedy
1385Find the Distance Value Between Two ArraysSolutionEasyArray
1382Balance a Binary Search TreeSolutionMediumBinary Search Tree
1381Design a Stack With Increment OperationSolutionMediumStack, Design
1380Lucky Numbers in a MatrixSolutionEasyArray
1379Find a Corresponding Node of a Binary Tree in a Clone of That TreeSolutionMediumTree
1377Frog Position After T SecondsSolutionHardDFS, BFS
1376Time Needed to Inform All EmployeesSolutionMediumDFS
1375Bulb Switcher IIISolutionMediumArray
1374Generate a String With Characters That Have Odd CountsSolutionEasyString
1373Maximum Sum BST in Binary TreeSolutionHardDP, BST
1372Longest ZigZag Path in a Binary TreeSolutionHardDP, Tree
1371Find the Longest Substring Containing Vowels in Even CountsSolutionMediumString
1370Increasing Decreasing StringSolutionEasyString, Sort
1367Linked List in Binary TreeSolutionMediumDP, Linked List, Tree
1366Rank Teams by VotesSolutionMediumArray, Sort
1365How Many Numbers Are Smaller Than the Current NumberSolutionEasyArray, HashTable
1362Closest DivisorsSolutionMediumMath
1361Validate Binary Tree NodesSolutionMediumGraph
1360Number of Days Between Two DatesSolutionEasy
1358Number of Substrings Containing All Three CharactersSolutionMediumString
1357Apply Discount Every n OrdersSolutionMediumDesign
1356Sort Integers by The Number of 1 BitsSolutionEasySort, Bit Manipulation
1354Construct Target Array With Multiple SumsSolutionHardGreedy
1353Maximum Number of Events That Can Be AttendedSolutionMediumGreedy, Sort, Segment Tree
1352Product of the Last K NumbersSolutionMediumArray, Design
1351Count Negative Numbers in a Sorted MatrixSolutionEasyArray, Binary Search
1349Maximum Students Taking ExamSolutionHardDynamic Programming
1348Tweet Counts Per FrequencySolutionMediumDesign
1347Minimum Number of Steps to Make Two Strings AnagramSolutionEasyString
1346Check If N and Its Double ExistSolutionEasyArray
1345Jump Game IVSolutionHardBFS
1344Angle Between Hands of a ClockSolutionMediumMath
1343Number of Sub-arrays of Size K and Average Greater than or Equal to ThresholdSolutionMediumArray
1342Number of Steps to Reduce a Number to ZeroSolutionEasyBit Manipulation
1341The K Weakest Rows in a MatrixSolutionEasy
1339Maximum Product of Splitted Binary TreeSolutionMediumDP, Tree
1338Reduce Array Size to The HalfSolutionMedium
1337Remove Palindromic SubsequencesSolutionEasyString
1333Filter Restaurants by Vegan-Friendly, Price and DistanceSolutionMedium
1332Remove Palindromic SubsequencesSolutionEasyString
1331Rank Transform of an ArraySolutionEasy
1329Sort the Matrix DiagonallySolutionMedium
1325Delete Leaves With a Given ValueSolutionMediumTree
1324Print Words VerticallySolutionMediumString
1323Maximum 69 NumberSolutionEasyMath
1317Convert Integer to the Sum of Two No-Zero IntegersSolutionEasy
1315Sum of Nodes with Even-Valued GrandparentSolutionMediumTree, DFS
1314Matrix Block SumSolutionMediumDynamic Programming
1313Decompress Run-Length Encoded ListSolutionEasyArray
1305All Elements in Two Binary Search TreesSolutionMedium
1304Find N Unique Integers Sum up to ZeroSolutionEasy
1302Deepest Leaves SumSolutionMedium
1300Sum of Mutated Array Closest to TargetSolutionMediumBinary Search, Sorting
1299Replace Elements with Greatest Element on Right SideSolutionEasy
1297Maximum Number of Occurrences of a SubstringSolutionMedium
1296Divide Array in Sets of K Consecutive NumbersSolutionMedium
1295Find Numbers with Even Number of DigitsJavaJavascript📺Easy
1291Sequential DigitsSolutionMedium
1290Convert Binary Number in a Linked List to IntegerSolutionEasy
1289Minimum Falling Path Sum IISolutionHardDynamic Programming
1287Element Appearing More Than 25% In Sorted ArraySolution📺Easy
1286Iterator for CombinationSolutionMediumBacktracking, Design
1283Find the Smallest Divisor Given a ThresholdSolutionMedium
1282Group the People Given the Group Size They Belong ToSolution📺Medium
1281Subtract the Product and Sum of Digits of an IntegerSolutionEasy
1277Count Square Submatrices with All OnesSolutionMedium
1275Find Winner on a Tic Tac Toe GameSolutionEasyArray
1273Delete Tree NodesSolutionMediumDynamic Programming, DFS
1271HexspeakSolutionEasy
1268Search Suggestions SystemSolution📺MediumString
1267Count Servers that CommunicateSolutionMedium
1266Minimum Time Visiting All PointsSolutionEasy
1265Print Immutable Linked List in ReverseSolutionMedium
1261Find Elements in a Contaminated Binary TreeSolutionMediumTree, HashTable
1260Shift 2D GridSolution📺Easy
1258Synonymous SentencesSolutionMediumBacktracking
1257Smallest Common RegionSolutionMediumTree, HashTable, DFS, BFS
1252Cells with Odd Values in a MatrixSolutionEasy
1249Minimum Remove to Make Valid ParenthesesSolutionMediumString, Stack
1243Array TransformationSolution📺Easy
1237Find Positive Integer Solution for a Given EquationSolutionEasy
1232Check If It Is a Straight LineSolution📺Easy
1228Missing Number In Arithmetic ProgressionSolutionEasy
1221Split a String in Balanced StringsSolutionEasyGreedy
1219Path with Maximum GoldSolutionMediumBacktracking
1217Play with ChipsSolutionEasyArray, Math, Greedy
1214Two Sum BSTsSolutionMediumBinary Search Tree
1213Intersection of Three Sorted ArraysSolution📺Easy
1209Remove All Adjacent Duplicates in String IISolutionMediumStack
1207Unique Number of OccurrencesSolution📺Easy
1200Minimum Absolute DifferenceSolution📺Easy
1198Find Smallest Common Element in All RowsSolution📺Easy
1196How Many Apples Can You Put into the BasketSolution📺Easy
1190Reverse Substrings Between Each Pair of ParenthesesSolutionMediumStack
1189Maximum Number of BalloonsSolution📺Easy
1185Day of the WeekSolutionEasy
1184Distance Between Bus StopsSolution📺Easy
1182Shortest Distance to Target ColorSolutionMediumBinary Search
1180Count Substrings with Only One Distinct LetterSolutionEasyMath, String
1176Diet Plan PerformanceSolutionEasyArray, Sliding Window
1175Prime ArrangementsSolutionEasyMath
1171Remove Zero Sum Consecutive Nodes from Linked ListSolutionMediumLinkedList
1165Single-Row KeyboardSolutionEasy
1161Maximum Level Sum of a Binary TreeSolutionMediumGraph
1160Find Words That Can Be Formed by CharactersSolutionEasy
1154Day of the YearSolutionEasy
1152Analyze User Website Visit PatternSolution📺MediumHashTable, Sort, Array
1151Minimum Swaps to Group All 1's TogetherSolutionMediumArray, Sliding Window
1150Check If a Number Is Majority Element in a Sorted ArraySolution📺Easy
1146Snapshot ArrayJavascriptEasy
1143Longest Common SubsequenceSolutionMedium
1138Alphabet Board PathSolution📺MediumHashTable, String
1137N-th Tribonacci NumberSolutionEasy
1136Parallel CoursesSolutionMedium
1134Armstrong NumberSolution📺Easy
1133Largest Unique NumberSolution📺Easy
1128Number of Equivalent Domino PairsSolution📺Easy
1122Relative Sort ArraySolutionEasy
1170Compare Strings by Frequency of the Smallest CharacterSolutionEasy
1119Remove Vowels from a StringSolution📺Easy
1118Number of Days in a MonthSolutionEasy
1114Print in OrderSolutionEasy
1110Delete Nodes And Return ForestSolutionMediumTree, DFS
1108Defanging an IP AddressSolution📺Easy
1104Path In Zigzag Labelled Binary TreeSolutionMediumMath, Tree
1103Distribute Candies to PeopleSolutionEasyMath
1100Find K-Length Substrings With No Repeated CharactersSolutionMediumString, Sliding Window
1099Two Sum Less Than KSolution📺Easy
1094Car PoolingSolutionMediumArray, Sorting, Heap, Simulation, Prefix Sum
1090Largest Values From LabelsSolution📺MediumHashTable, Greedy
1091Shortest Path in Binary MatrixSolutionMediumBFS
1089Duplicate ZerosSolutionEasy
1087Brace ExpansionSolutionMediumBacktracking
1086High FiveSolution📺Easy
1085Sum of Digits in the Minimum NumberSolution📺Easy
1079Letter Tile PossibilitiesSolutionMedium
1078Occurrences After BigramSolutionEasy
1071Greatest Common Divisor of StringsSolutionEasy
1066Campus Bikes IISolutionMediumBacktracking, DP
1065Index Pairs of a StringSolutionMedium
1062Longest Repeating SubstringSolutionMediumString, Binary Search, DP, Rolling Hash, Suffix Array, Hash Function
1061Lexicographically Smallest Equivalent StringSolution📺MediumUnion Find
1057Campus BikesSolutionMedium
1056Confusing NumberSolutionEasy
1055Fixed PointSolutionEasy
1051Height CheckerSolutionEasy
1047Remove All Adjacent Duplicates In StringSolutionEasy
1046Last Stone WeightSolution📺Easy
1043Partition Array for Maximum SumSolutionMediumDP
1038Binary Search Tree to Greater Sum TreeSolutionMediumDFS, tree
1037Valid BoomerangSolutionEasyMath
1033Moving Stones Until ConsecutiveSolutionEasyMath
1030Matrix Cells in Distance OrderSolutionEasy
1029Two City SchedulingSolutionEasy
1026Maximum Difference Between Node and AncestorSolutionMediumTree, DFS, Binary Tree
1025Divisor GameSolutionEasyMath, DP, Brainteaser, Game Theory
1024Video StitchingSolutionMediumArray, DP, Greedy
1022Sum of Root To Leaf Binary NumbersSolutionEasy
1021Remove Outermost ParenthesesSolutionEasy
1020Number of EnclavesSolutionMediumGraph, DFS, BFS, recursion
1019Next Greater Node In Linked ListSolutionMediumLinked List, Stack
1018Binary Prefix Divisible By 5SolutionEasy
1014Best Sightseeing PairSolutionMedium
1013Partition Array Into Three Parts With Equal SumSolutionEasy
1011Capacity To Ship Packages Within D DaysSolutionMediumBinary Search
1010Pairs of Songs With Total Durations Divisible by 60SolutionEasy
1009Complement of Base 10 IntegerSolutionEasy
1008Construct Binary Search Tree from Preorder TraversalSolutionMediumRecursion
1005Maximize Sum Of Array After K NegationsSolution📺Easy
1004Max Consecutive Ones IIISolution📺MediumTwo Pointers, Sliding Window
1003Check If Word Is Valid After SubstitutionsSolutionMedium
1002Find Common CharactersSolutionEasy
999Available Captures for RookSolutionEasy
991Broken CalculatorSolutionMediumMath, Greedy
981Time Based Key-Value StoreSolution📺Medium
997Find the Town JudgeSolutionEasy
994Rotting OrangesSolutionMediumBFS
993Cousins in Binary TreeSolutionEasyTree, BFS
989Add to Array-Form of IntegerSolutionEasyArray
988Smallest String Starting From LeafSolutionMediumTree, DFS
987Vertical Order Traversal of a Binary TreeSolutionMediumRecursion
986Interval List IntersectionsSolutionMediumTwo Pointers
985Sum of Even Numbers After QueriesSolutionEasyArray
980Unique Paths IIISolutionHardBacktracking, DFS
979Distribute Coins in Binary TreeSolutionMediumRecursion
977Squares of a Sorted ArraySolutionEasyArray
976Largest Perimeter TriangleSolutionEasyMath Array
974Subarray Sums Divisible by KSolutionMediumArray
973K Closest Points to OriginSolutionEasyMath Sort
970Powerful IntegersSolutionEasyMath
966Vowel SpellcheckerSolutionMediumHash Table, String
965Univalued Binary TreeSolutionEasyDFS, recursion
961N-Repeated Element in Size 2N ArraySolutionEasy
958Check Completeness of a Binary TreeSolutionMediumTree
957Prison Cells After N DaysSolution📺Medium
954Array of Doubled PairsSolution📺Medium
953Verifying an Alien DictionarySolutionEasy
951Flip Equivalent Binary TreesSolutionMediumTree, DFS, recursion
950Reveal Cards In Increasing OrderSolutionMedium
946Validate Stack SequencesSolutionMediumStack
944Delete Columns to Make SortedSolutionEasy
942DI String MatchSolutionEasy
941Valid Mountain ArraySolutionEasy
938Range Sum of BSTSolutionMediumBST, recursion, DFS
937Reorder Log FilesSolutionEasy
936Stamping The SequenceSolutionHardString, Greedy
935Knight DialerSolutionMedium
933Number of Recent CallsSolutionEasy
931Minimum Falling Path SumSolutionMediumDynamic Programming
929Unique Email AddressesSolutionEasy
925Long Pressed NameSolutionEasy
9233Sum With MultiplicitySolutionMediumTwo Pointers
922Sort Array By Parity IISolutionEasy
921Minimum Add to Make Parentheses ValidSolutionMediumStack, Greedy
918Maximum Sum Circular SubarraySolutionMediumArray, DP, Monotonic Queue
917Reverse Only LettersSolutionEasy
914X of a Kind in a Deck of CardsSolutionEasy
912Sort an ArraySolutionEasy
908Smallest Range ISolutionEasy
901Online Stock SpanSolutionMediumStack
904Fruit Into BasketsSolution📺MediumTwo Pointers
900RLE IteratorSolutionMedium
897Increasing Order Search TreeSolutionEasyDFS, recursion
896Monotonic ArraySolutionEasy
895Maximum Frequency StackSolutionHashTable, StackHard
893Groups of Special-Equivalent StringsSolution📺Easy
892Surface Area of 3D ShapesSolutionArray, Math, Geometry, MatrixEasy
890Find and Replace PatternSolutionMedium
888Fair Candy SwapSolutionEasy
885Spiral Matrix IIISolution📺Medium
884Uncommon Words from Two SentencesSolutionEasy
883Projection Area of 3D ShapesSolutionEasyMath
881Boats to Save PeopleSolutionMediumTwo Pointers, Greedy
880Decoded String at IndexSolutionMediumStack
877Stone GameSolutionMediumMath, DP, Minimax
876Middle of the Linked ListSolutionEasy
872Leaf-Similar TreesSolutionEasyDFS, recursion
870Advantage ShuffleSolutionMediumArray, Greedy
868Binary GapSolutionEasy
867Transpose MatrixSolutionEasy
861Score After Flipping MatrixSolutionMediumGreedy
860Lemonade ChangeSolutionEasy
859Buddy StringsSolutionEasy
856Score of ParenthesesSolutionMediumStack, String
852Peak Index in a Mountain ArraySolutionEasy
849Maximize Distance to Closest PersonSolutionEasy
848Shifting LettersSolutionMediumArray, String
844Backspace String CompareSolutionEasy
841Keys and RoomsSolutionEasyDFS, Graph
840Magic Squares In GridSolutionEasy
838Push DominoesSolution📺MediumTwo Pointers, DP
836Rectangle OverlapSolution📺Easy
832Flipping an ImageSolutionEasy
830Positions of Large GroupsSolutionEasy
824Goat LatinSolutionEasy
823Binary Trees With FactorsSolutionMedium
821Shortest Distance to a CharacterSolutionEasy
820Short Encoding of WordsSolutionMedium
819Most Common WordSolutionEasyHashMap
816Ambiguous CoordinatesSolutionMediumString
814Binary Tree PruningSolutionMediumrecursion, DFS
812Largest Triangle AreaSolutionEasyArray, Math, Geometry
811Subdomain Visit CountSolutionEasyHashMap
809Expressive WordsSolutionMedium
807Max Increase to Keep City SkylineSolutionMedium
806Number of Lines To Write StringSolutionEasy
804Unique Morse Code WordsSolutionEasy
800Similar RGB ColorSolutionEasy
799Champagne TowerSolutionMedium
796Rotate StringSolutionEasy
792Number of Matching SubsequencesSolutionMediumHashTable, String, Trie, Sorting
791Custom Sort StringSolutionMedium
789Escape The GhostsSolutionMediumMath
788Rotated DigitsSolutionEasy
785Is Graph Bipartite?SolutionMedium
784Letter Case PermutationSolutionEasy
783Minimum Distance Between BST NodesSolutionEasy
781Rabbits in ForestSolution📺MediumHashTable, Math
779K-th Symbol in GrammarSolutionMedium
776Split BSTSolutionMediumRecursion
775Global and Local InversionsSolutionMediumArray, Math
771Jewels and StonesSolutionEasy
769Max Chunks To Make SortedSolutionMediumArray
767Reorganize StringSolutionMedium
766Toeplitz MatrixSolutionEasy
765Couples Holding HandsSolutionHard
764Largest Plus SignSolutionMediumDP
763Partition LabelsSolutionMedium
762Prime Number of Set Bits in Binary RepresentationSolutionEasy
760Find Anagram MappingsSolutionEasy
758Bold Words in StringSolutionEasy
757Set Intersection Size At Least TwoSolutionHard
756Pyramid Transition MatrixSolutionMediumBacktracking
755Pour WaterSolutionMediumArray
754Reach a NumberSolutionMediumMath
750Number Of Corner RectanglesSolutionMedium
748Shortest Completing WordSolutionEasy
747Largest Number Greater Than Twice of OthersSolutionEasy
746Min Cost Climbing StairsSolutionEasy
744Find Smallest Letter Greater Than TargetSolutionEasy
743Network Delay TimeSolutionMediumGraph, Djikstra
742Closest Leaf in a Binary TreeSolutionMediumTree
740Delete and EarnSolutionMedium
739Daily TemperaturesSolutionMedium
738Monotone Increasing DigitsSolutionMedium
737Sentence Similarity IISolutionMediumUnion Find
735Asteroid CollisionSolutionMediumStack
734Sentence SimilaritySolutionEasyHashTable
733Flood FillSolutionEasyBFS, DFS
729My Calendar ISolutionMedium
728Self Dividing NumbersSolutionEasy
727Minimum Window SubsequenceSolutionHardDP
725Split Linked List in PartsSolutionMediumLinkedList
724Find Pivot IndexSolutionEasyArray
723Candy CrushSolutionMediumArray, Two Pointers
721Accounts MergeSolutionMediumDFS, Union Find
720Longest Word in DictionarySolutionEasyTrie
719Find K-th Smallest Pair DistanceSolutionHardBinary Search
718Maximum Length of Repeated SubarraySolutionMediumDP
7171-bit and 2-bit CharactersSolutionEasy
716Max StackSolutionHardDesign
714Best Time to Buy and Sell Stock with Transaction FeeSolutionMediumDP
713Subarray Product Less Than KSolutionMedium
712Minimum ASCII Delete Sum for Two StringsSolutionMediumDP
709To Lower CaseSolutionEasyString
708Insert into a Sorted Circular Linked ListSolutionMediumLinked List
706Design HashMapSolutionEasyDesign
705Design HashSetSolutionEasyDesign
704Binary SearchSolution📺EasyBinary Search
703Kth Largest Element in a StreamSolutionEasy
701Insert into a Binary Search TreeSolutionMediumDFS, recursion
700Search in a Binary Search TreeSolutionEasyrecusion, dfs
699Falling SquaresSolutionHardSegment Tree
698Partition to K Equal Sum SubsetsJava,C++MediumBacktracking + DP
697Degree of an ArraySolutionEasy
696Count Binary SubstringsSolutionEasy
695Max Area of IslandSolutionMediumDFS, FBS, Union Find, Matrix
694Number of Distinct IslandsSolutionMediumDFS
693Binary Number with Alternating BitsSolutionEasy
692Top K Frequent WordsSolutionMedium
691Stickers to Spell WordSolutionHardDP
690Employee ImportanceSolutionEasyDFS
689Maximum Sum of 3 Non-Overlapping SubarraysSolutionHardDP
688Knight Probability in ChessboardSolutionMediumDP
687Longest Univalue PathSolutionEasyDFS
686Repeated String MatchSolutionEasy
685Redundant Connection IISolutionHardUnion Find
684Redundant ConnectionSolutionMediumUnion Find
683K Empty SlotsSolutionHard
682Baseball GameSolutionEasy
681Next Closest TimeSolutionMedium
680Valid Palindrome IISolutionEasyString
67924 GameSolutionHardRecursion
678Valid Parenthesis StringSolutionMediumRecursion, Greedy
677Map Sum PairsSolutionMediumHashMap, Trie
676Implement Magic DictionarySolutionMedium
675Cut Off Trees for Golf EventSolutionHardBFS
674Longest Continuous Increasing SubsequenceSolutionEasy
673Number of Longest Increasing SubsequenceSolutionMediumDP
672Bulb Switcher IISolutionMediumMath
671Second Minimum Node In a Binary TreeSolutionEasyTree, DFS
670Maximum SwapSolutionMediumString
669Trim a Binary Search TreeSolutionEasyTree, DFS
668Kth Smallest Number in Multiplication TableSolutionHardBinary Search
667Beautiful Arrangement IISolutionMediumArray
666Path Sum IVSolutionMediumTree, DFS
665Non-decreasing ArraySolutionEasy
664Strange PrinterSolutionHardDP
663Equal Tree PartitionSolutionMediumTree
662Maximum Width of Binary TreeSolutionMediumBFS, DFS
661Image SmootherSolutionEasyArray
660Remove 9SolutionHardMath
659Split Array into Consecutive SubsequencesSolutionMediumHashMap
658Find K Closest ElementsSolutionMedium
657Judge Route CircleSolutionEasy
656Coin PathSolutionHardDP
655Print Binary TreeSolutionMediumRecursion
654Maximum Binary TreeSolutionMediumTree
653Two Sum IV - Input is a BSTSolutionEasyTree
652Find Duplicate SubtreesSolutionMediumTree
6514 Keys KeyboardSolutionMediumDP
6502 Keys KeyboardSolutionMediumDP
649Dota2 SenateSolutionMediumGreedy
648Replace WordsSolutionMediumTrie
647Palindromic SubstringsSolutionMediumDP
646Maximum Length of Pair ChainSolutionMediumDP, Greedy
645Set MismatchSolutionEasy
644Maximum Average Subarray IISolutionHardBinary Search
643Maximum Average Subarray ISolutionEasy
642Design Search Autocomplete SystemSolutionHardDesign
640Solve the EquationSolutionMedium
639Decode Ways IISolutionHardDP
638Shopping OffersSolutionMediumDP, DFS
637Average of Levels in Binary TreeSolutionEasy
636Exclusive Time of FunctionsSolutionMediumStack
635Design Log Storage SystemSolutionMediumDesign
634Find the Derangement of An ArraySolutionMediumMath
633Sum of Square NumbersSolutionEasyBinary Search
632Smallest RangeSolutionHardHeap
631Design Excel Sum FormulaSolutionHardDesign, Topological Sort
630Course Schedule IIISolutionHardHeap, Greedy
629K Inverse Pairs ArraySolutionHardDP
628Maximum Product of Three NumbersSolutionEasy
625Minimum FactorizationSolutionMedium
624Maximum Distance in ArraysSolutionEasySort, Array
623Add One Row to TreeSolutionMediumTree
622Design Circular QueueSolutionMediumDesign, Queue
621Task SchedulerSolutionMediumGreedy, Queue
617Merge Two Binary TreesSolutionEasyTree, Recursion
616Add Bold Tag in StringSolutionMediumString
611Valid Triangle NumberSolutionMediumBinary Search
609Find Duplicate File in SystemSolutionMediumHashMap
606Construct String from Binary TreeSolutionEasyTree, Recursion
605Can Place FlowersSolutionEasyArray
604Design Compressed String IteratorSolutionEasyDesign, String
600Non-negative Integers without Consecutive OnesSolutionHardBit Manipulation, DP
599Minimum Index Sum of Two ListsSolutionEasyHashMap
598Range Addition IISolutionEasy
594Longest Harmonious SubsequenceSolutionEasyArray, HashMap
593Valid SquareJava,JavascriptMediumMath
592Fraction Addition and SubtractionSolutionMediumMath
591Tag ValidatorSolutionHardStack, String
590N-ary Tree Postorder TraversalSolutionEasyDFS, recursion
589N-ary Tree Preorder TraversalSolutionEasyDFS, recursion
588Design In-Memory File SystemSolutionHardTrie, Design
587Erect the FenceSolutionHardGeometry
583Delete Operation for Two StringsSolutionMediumDP
582Kill ProcessSolutionMediumStack
581Shortest Unsorted Continuous SubarraySolutionEasyArray, Sort
576Out of Boundary PathsSolutionHardDP, DFS
575Distribute CandiesSolutionEasyArray
573Squirrel SimulationSolutionMediumMath
572Subtree of Another TreeSolutionEasyTree
568Maximum Vacation DaysSolutionHardDP
567Permutation in StringSolutionMediumSliding Windows, Two Pointers
566Reshape the MatrixSolutionEasy
565Array NestingSolutionMedium
563Binary Tree TiltSolutionEasyTree Recursion
562Longest Line of Consecutive One in MatrixSolutionMediumMatrix DP
561Array Partition ISolutionEasyArray
560Subarray Sum Equals KSolutionMediumArray, HashMap
559Maximum Depth of N-ary TreeSolutionEasyDFS, recursion
557Reverse Words in a String IIISolutionEasyString
556Next Greater Element IIISolutionMediumString
555Split Concatenated StringsSolutionMediumString
554Brick WallSolutionMediumHashMap
553Optimal DivisionSolutionMediumString, Math
552Student Attendance Record IISolutionHardDP
551Student Attendance Record ISolutionEasyString
549Binary Tree Longest Consecutive Sequence IISolutionMediumTree
548Split Array with Equal SumSolutionMediumArray
547Friend CirclesSolutionMediumUnion Find
546Remove BoxesSolutionHardDFS, DP
545Boundary of Binary TreeSolutionMediumRecursion
544Output Contest MatchesSolutionMediumRecursion
543Diameter of Binary TreeSolutionEasyTree/DFS/Recursion
54201 MatrixSolutionMediumBFS
541Reverse String IISolutionEasyString
540Single Element in a Sorted ArraySolutionMediumArray, Binary Search
539Minimum Time DifferenceSolutionMediumString
538Convert BST to Greater TreeSolutionEasyTree
537Complex Number MultiplicationSolutionMediumMath, String
536Construct Binary Tree from StringSolutionMediumRecursion, Stack
535Encode and Decode TinyURLSolutionMediumDesign
533Lonely Pixel IISolutionMediumHashMap
532K-diff Pairs in an ArraySolutionEasyHashMap
531Lonely Pixel ISolutionMedium
530Minimum Absolute Difference in BSTSolutionEasyDFS
529MinesweeperSolutionMediumBFS
528Random Pick with WeightSolutionMediumMath, Binary Search, Prefix Sum, Randomized
527Word AbbreviationSolutionHard
526Beautiful ArrangementSolutionMediumBacktracking
525Contiguous ArraySolutionMediumHashMap
524Longest Word in Dictionary through DeletingSolutionMediumSort
523Continuous Subarray SumSolutionMediumDP
522Longest Uncommon Subsequence IISolutionMedium
521Longest Uncommon Subsequence ISolutionEasy
520Detect CapitalSolutionEasy
518Coin Change 2SolutionMediumArray, DP
517Super Washing MachinesSolutionHardDP
516Longest Palindromic SubsequenceSolutionMediumDP
515Find Largest Value in Each Tree RowSolutionMediumBFS
514Freedom TrailSolutionHardDP
513Find Bottom Left Tree ValueSolutionMediumBFS
509Fibonacci NumberSolution📺EasyArray
508Most Frequent Subtree SumSolutionMediumDFS, Tree
507Perfect NumberSolutionEasyMath
506Relative RanksSolutionEasy
505The Maze IISolutionMediumBFS
504Base 7SolutionEasy
503Next Greater Element IISolutionMediumStack
502IPOSolutionHardHeap, Greedy
501Find Mode in Binary TreeSolutionEasyBinary Tree
500Keyboard RowSolutionEasy
499The Maze IIISolutionHardBFS
496Next Greater Element ISolutionEasy
498Diagonal TraverseSolutionMedium
495Teemo AttackingSolutionMediumArray
494Target SumSolutionMedium
493Reverse PairsSolutionHardRecursion
492Construct the RectangleSolutionEasyArray
491Increasing SubsequencesSolutionMediumBacktracking, DFS
490The MazeSolutionMediumBFS
488Zuma GameSolutionHardDFS, Backtracking
487Max Consecutive Ones IISolution📺MediumArray, Sliding Window
486Predict the WinnerSolutionMediumDP
485Max Consecutive OnesJavaJavascript📺EasyArray
484Find PermutationSolutionMediumArray, String, Greedy
483Smallest Good BaseSolutionHardBinary Search, Math
482License Key FormattingSolutionMedium
481Magical StringSolutionMedium
480Sliding Window MedianSolutionHardHeap
479Largest Palindrome ProductSolutionEasy
477Total Hamming DistanceSolutionMediumBit Manipulation
478Generate Random Point in a CircleSolutionMediumMath, Random, Rejection Sampling
476Number ComplementSolutionEasyBit Manipulation
475HeatersSolutionEasyArray Binary Search
474Ones and ZeroesSolutionMediumDP
473Matchsticks to SquareSolutionMediumBacktracking, DFS
472Concatenated WordsSolutionHardTrie, DP, DFS
471Encode String with Shortest LengthSolutionHardDP
469Convex PolygonSolutionMediumMath
468Validate IP AddressSolutionMediumString
467Unique Substrings in Wraparound StringSolutionMediumDP
466Count The RepetitionsSolutionHardDP
465Optimal Account BalancingSolutionHardDP
464Can I WinSolutionMediumDP
463Island PerimeterSolutionEasy
462Minimum Moves to Equal Array Elements IISolutionMedium
461Hamming DistanceSolution,C++Easy
460LFU CacheSolutionHardDesign, LinkedHashMap, HashMap
459Repeated Substring PatternSolutionEasyString, KMP
458Poor PigsSolutionEasyMath
457Circular Array LoopSolutionMedium
456132 PatternSolutionMediumStack
455Assign CookiesSolutionEasy
4544Sum IISolutionMediumHashMap
453Minimum Moves to Equal Array ElementsSolutionEasy
452Minimum Number of Arrows to Burst BalloonsSolutionMediumArray, Greedy
451Sort Characters By FrequencySolutionMediumHashMap
450Delete Node in a BSTSolutionMediumTree, Recursion
449Serialize and Deserialize BSTSolutionMediumBFS
448Find All Numbers Disappeared in an ArraySolutionEasyArray, HashMap
447Number of BoomerangsSolutionEasyHashMap
446Arithmetic Slices II - SubsequenceSolutionHardDP
445Add Two Numbers IISolutionMediumStack, LinkedList
444Sequence ReconstructionSolutionMediumTopological Sort, Graph
443String CompressionSolutionEasy
442Find All Duplicates in an ArraySolutionMediumArray
441Arranging CoinsSolutionEasy
440K-th Smallest in Lexicographical OrderSolutionHard
439Ternary Expression ParserSolutionMediumStack
438Find All Anagrams in a StringSolutionEasySliding Window
437Path Sum IIISolutionEasyDFS, recursion
436Find Right IntervalSolutionMediumBinary Search
435Non-overlapping IntervalsSolutionMediumGreedy
434Number of Segments in a StringSolutionEasy
432All O`one Data StructureSolutionHardDesign
430Flatten a Multilevel Doubly Linked ListSolutionMediumLinkedList, DFS, Doubly-Linked List
429N-ary Tree Level Order TraversalSolutionEasyBFS, Tree
426Convert Binary Search Tree to Sorted Doubly Linked ListSolutionMediumDFS, BST, Recursion
425Word SquaresSolutionHardTrie, Backtracking, Recursion
424Longest Repeating Character ReplacementSolutionMediumSliding Window
423Reconstruct Original Digits from EnglishSolutionMediumMath
422Valid Word SquareSolutionEasy
421Maximum XOR of Two Numbers in an ArraySolutionMediumBit Manipulation, Trie
420Strong Password CheckerSolutionHard
419Battleships in a BoardSolutionMediumDFS
418Sentence Screen FittingSolutionMedium
417Pacific Atlantic Water FlowSolutionMediumDFS
416Partition Equal Subset SumJava,C++MediumDP
415Add StringsSolutionEasy
414Third Maximum NumberSolutionEasy
413Arithmetic SlicesSolutionMediumDP
412Fizz BuzzSolutionEasy
411Minimum Unique Word AbbreviationSolutionHardNP-Hard, Backtracking, Trie, Recursion
410Split Array Largest SumSolutionHardBinary Search, DP
409Longest PalindromeSolutionEasy
408Valid Word AbbreviationSolutionEasy
407Trapping Rain Water IISolutionHardHeap
406Queue Reconstruction by HeightSolutionMediumLinkedList, PriorityQueue
405Convert a Number to HexadecimalSolutionEasy
404Sum of Left LeavesSolutionEasy
403Frog JumpSolutionHardDP
402Remove K DigitsSolutionMediumGreedy, Stack
401Binary WatchSolutionEasy
400Nth DigitSolutionEasy
399Evaluate DivisionSolutionMediumGraph, DFS, Backtracking
398Random Pick IndexSolutionMediumReservoir Sampling
397Integer ReplacementSolutionEasyBFS
396Rotate FunctionSolutionEasy
395Longest Substring with At Least K Repeating CharactersSolutionMediumRecursion
394Decode StringSolutionMediumStack Depth-first-search
393UTF-8 ValidationSolutionMediumBit Manipulation
392Is SubsequenceSolutionMediumArray, String
391Perfect RectangleSolutionHard
390Elimination GameSolutionMedium
389Find the DifferenceSolutionEasy
388Longest Absolute File PathSolutionMediumStack
387First Unique Character in a StringSolutionEasyHashMap
386Lexicographical NumbersSolutionMedium
385Mini ParserSolutionMediumStack
384Shuffle an ArraySolutionMedium
383Ransom NoteSolutionEasyString
382Linked List Random Node

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