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1993. Operations on TreeMedium
LeetCodeArrayHash TableTreeDepth-First Search
1996. The Number of Weak Characters in the GameMedium
LeetCodeArrayStackGreedySorting
1997. First Day Where You Have Been in All the RoomsMedium
LeetCodeArrayDynamic Programming
1999. Smallest Greater Multiple Made of Two DigitsMedium
LeetCodeMathEnumeration
2. Add Two NumbersMedium
LeetCodeLinked ListMathRecursion
200. Number of IslandsMedium
LeetCodeArrayDepth-First SearchBreadth-First SearchUnion-Find
2001. Number of Pairs of Interchangeable RectanglesMedium
LeetCodeArrayHash TableMathCounting
2002. Maximum Product of the Length of Two Palindromic SubsequencesMedium
LeetCodeStringDynamic ProgrammingBacktrackingBit Manipulation
2007. Find Original Array From Doubled ArrayMedium
LeetCodeArrayHash TableGreedySorting
2008. Maximum Earnings From TaxiMedium
LeetCodeArrayHash TableBinary SearchDynamic Programming
201. Bitwise AND of Numbers RangeMedium
LeetCodeBit Manipulation
2012. Sum of Beauty in the ArrayMedium
LeetCodeArray
2013. Detect SquaresMedium
LeetCodeArrayHash TableDesignCounting
2015. Average Height of Buildings in Each SegmentMedium
LeetCodeArraySortingHeap (Priority Queue)Prefix Sum
2017. Grid GameMedium
LeetCodeArrayMatrixPrefix Sum
2018. Check if Word Can Be Placed In CrosswordMedium
LeetCodeArrayMatrixEnumeration
2020. Number of Accounts That Did Not StreamMedium
LeetCodeDatabase
2021. Brightest Position on StreetMedium
LeetCodeArraySortingPrefix SumOrdered Set
2023. Number of Pairs of Strings With Concatenation Equal to TargetMedium
LeetCodeArrayHash TableStringCounting
2024. Maximize the Confusion of an ExamMedium
LeetCodeStringBinary SearchSliding WindowPrefix Sum
2028. Find Missing ObservationsMedium
LeetCodeArrayMathSimulation
2029. Stone Game IXMedium
LeetCodeArrayMathGreedyCounting
2031. Count Subarrays With More Ones Than ZerosMedium
LeetCodeArrayHash TableBinary SearchDivide and Conquer
2033. Minimum Operations to Make a Uni-Value GridMedium
LeetCodeArrayMathSortingMatrix
2034. Stock Price Fluctuation Medium
LeetCodeHash TableDesignHeap (Priority Queue)Data Stream
2036. Maximum Alternating Subarray SumMedium
LeetCodeArrayDynamic Programming
2038. Remove Colored Pieces if Both Neighbors are the Same ColorMedium
LeetCodeMathStringGreedyGame Theory
2039. The Time When the Network Becomes IdleMedium
LeetCodeArrayBreadth-First SearchGraph Theory
204. Count PrimesMedium
LeetCodeArrayMathEnumerationNumber Theory
2041. Accepted Candidates From the InterviewsMedium
LeetCodeDatabase
2043. Simple Bank SystemMedium
LeetCodeArrayHash TableDesignSimulation
2044. Count Number of Maximum Bitwise-OR SubsetsMedium
LeetCodeArrayBacktrackingBit ManipulationEnumeration
2046. Sort Linked List Already Sorted Using Absolute ValuesMedium
LeetCodeLinked ListTwo PointersSorting
2048. Next Greater Numerically Balanced NumberMedium
LeetCodeHash TableMathBacktrackingCounting
2049. Count Nodes With the Highest ScoreMedium
LeetCodeArrayTreeDepth-First SearchBinary Tree
2051. The Category of Each Member in the StoreMedium
LeetCodeDatabase
2052. Minimum Cost to Separate Sentence Into RowsMedium
LeetCodeStringDynamic Programming
2054. Two Best Non-Overlapping EventsMedium
LeetCodeArrayBinary SearchDynamic ProgrammingSorting
2055. Plates Between CandlesMedium
LeetCodeArrayStringBinary SearchPrefix Sum
2058. Find the Minimum and Maximum Number of Nodes Between Critical PointsMedium
LeetCodeLinked List
2059. Minimum Operations to Convert NumberMedium
LeetCodeArrayBreadth-First Search
2061. Number of Spaces Cleaning Robot CleanedMedium
LeetCodeArrayMatrixSimulation
2063. Vowels of All SubstringsMedium
LeetCodeMathStringDynamic ProgrammingCombinatorics
2064. Minimized Maximum of Products Distributed to Any StoreMedium
LeetCodeArrayBinary SearchGreedy
2066. Account BalanceMedium
LeetCodeDatabase
2067. Number of Equal Count SubstringsMedium
LeetCodeHash TableStringSliding WindowCounting
2069. Walking Robot Simulation IIMedium
LeetCodeDesignSimulation
207. Course ScheduleMedium
LeetCodeDepth-First SearchBreadth-First SearchGraph TheoryTopological Sort
2070. Most Beautiful Item for Each QueryMedium
LeetCodeArrayBinary SearchSorting
2074. Reverse Nodes in Even Length GroupsMedium
LeetCodeLinked List
2075. Decode the Slanted CiphertextMedium
LeetCodeStringSimulation
2077. Paths in Maze That Lead to Same RoomMedium
LeetCodeGraph Theory
2079. Watering PlantsMedium
LeetCodeArraySimulation
208. Implement Trie (Prefix Tree)Medium
LeetCodeHash TableStringDesignTrie
2080. Range Frequency QueriesMedium
LeetCodeArrayHash TableBinary SearchDesign
2083. Substrings That Begin and End With the Same LetterMedium
LeetCodeHash TableMathStringCounting
2084. Drop Type 1 Orders for Customers With Type 0 OrdersMedium
LeetCodeDatabase
2086. Minimum Number of Food Buckets to Feed the HamstersMedium
LeetCodeStringDynamic ProgrammingGreedy
2087. Minimum Cost Homecoming of a Robot in a GridMedium
LeetCodeArrayGreedy
209. Minimum Size Subarray SumMedium
LeetCodeArrayBinary SearchSliding WindowPrefix Sum

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