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149 of 149 questions

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217.Contains Duplicate
EasyArrayHash Table
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242.Valid Anagram
EasyHash TableString
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1.Two Sum
EasyArrayHash Table
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49.Group Anagrams
MediumArrayHash Table
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347.Top K Frequent Elements
MediumArrayHash Table
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238.Product of Array Except Self
MediumArrayPrefix Sum
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36.Valid Sudoku
MediumArrayHash Table
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271.Encode and Decode Strings
MediumArrayString
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128.Longest Consecutive Sequence
MediumArrayHash Table
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125.Valid Palindrome
EasyTwo PointersString
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167.Two Sum II - Input Array Is Sorted
MediumArrayTwo Pointers
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15.3Sum
MediumArrayTwo Pointers
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11.Container With Most Water
MediumArrayTwo Pointers
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42.Trapping Rain Water
HardArrayTwo Pointers
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121.Best Time to Buy and Sell Stock
EasyArrayDynamic Programming
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3.Longest Substring Without Repeating Characters
MediumHash TableString
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424.Longest Repeating Character Replacement
MediumHash TableString
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567.Permutation in String
MediumHash TableTwo Pointers
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76.Minimum Window Substring
HardHash TableString
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239.Sliding Window Maximum
HardArrayQueue
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20.Valid Parentheses
EasyStringStack
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155.Min Stack
MediumStackDesign
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150.Evaluate Reverse Polish Notation
MediumArrayMath
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22.Generate Parentheses
MediumStringDynamic Programming
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739.Daily Temperatures
MediumArrayStack
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853.Car Fleet
MediumArrayStack
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84.Largest Rectangle in Histogram
HardArrayStack
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704.Binary Search
EasyArrayBinary Search
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74.Search a 2D Matrix
MediumArrayBinary Search
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875.Koko Eating Bananas
MediumArrayBinary Search
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153.Find Minimum in Rotated Sorted Array
MediumArrayBinary Search
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33.Search in Rotated Sorted Array
MediumArrayBinary Search
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981.Time Based Key-Value Store
MediumHash TableString
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4.Median of Two Sorted Arrays
HardArrayBinary Search
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206.Reverse Linked List
EasyLinked ListRecursion
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21.Merge Two Sorted Lists
EasyLinked ListRecursion
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141.Linked List Cycle
EasyHash TableLinked List
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143.Reorder List
MediumLinked ListTwo Pointers
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19.Remove Nth Node From End of List
MediumLinked ListTwo Pointers
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138.Copy List with Random Pointer
MediumHash TableLinked List
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2.Add Two Numbers
MediumLinked ListMath
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287.Find the Duplicate Number
MediumArrayTwo Pointers
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146.LRU Cache
MediumHash TableLinked List
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23.Merge k Sorted Lists
HardLinked ListDivide and Conquer
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25.Reverse Nodes in k-Group
HardLinked ListRecursion
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226.Invert Binary Tree
EasyTreeDFS
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104.Maximum Depth of Binary Tree
EasyTreeDFS
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543.Diameter of Binary Tree
EasyTreeDFS
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110.Balanced Binary Tree
EasyTreeDFS
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100.Same Tree
EasyTreeDFS
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572.Subtree of Another Tree
EasyTreeDFS
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235.Lowest Common Ancestor of a Binary Search Tree
MediumTreeDFS
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102.Binary Tree Level Order Traversal
MediumTreeBFS
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199.Binary Tree Right Side View
MediumTreeDFS
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1448.Count Good Nodes in Binary Tree
MediumTreeDFS
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98.Validate Binary Search Tree
MediumTreeDFS
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230.Kth Smallest Element in a BST
MediumTreeDFS
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105.Construct Binary Tree from Preorder and Inorder Traversal
MediumArrayHash Table
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124.Binary Tree Maximum Path Sum
HardDynamic ProgrammingTree
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297.Serialize and Deserialize Binary Tree
HardStringTree
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208.Implement Trie (Prefix Tree)
MediumHash TableString
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211.Design Add and Search Words Data Structure
MediumStringDFS
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212.Word Search II
HardArrayString
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215.Kth Largest Element in an Array
MediumArrayDivide and Conquer
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1046.Last Stone Weight
EasyArrayHeap
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973.K Closest Points to Origin
MediumArrayMath
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621.Task Scheduler
MediumArrayHash Table
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355.Design Twitter
MediumHash TableLinked List
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295.Find Median from Data Stream
HardTwo PointersSorting
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78.Subsets
MediumArrayBacktracking
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39.Combination Sum
MediumArrayBacktracking
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46.Permutations
MediumArrayBacktracking
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90.Subsets II
MediumArrayBacktracking
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40.Combination Sum II
MediumArrayBacktracking
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79.Word Search
MediumArrayBacktracking
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131.Palindrome Partitioning
MediumStringDynamic Programming
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17.Letter Combinations of a Phone Number
MediumHash TableString
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51.N-Queens
HardArrayBacktracking
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200.Number of Islands
MediumArrayDFS
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133.Clone Graph
MediumHash TableDFS
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695.Max Area of Island
MediumArrayDFS
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417.Pacific Atlantic Water Flow
MediumArrayDFS
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130.Surrounded Regions
MediumArrayDFS
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994.Rotting Oranges
MediumArrayBFS
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286.Walls and Gates
MediumArrayBFS
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207.Course Schedule
MediumDFSBFS
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210.Course Schedule II
MediumDFSBFS
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684.Redundant Connection
MediumDFSBFS
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323.Number of Connected Components in an Undirected Graph
MediumDFSBFS
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261.Graph Valid Tree
MediumDFSBFS
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127.Word Ladder
HardHash TableString
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332.Reconstruct Itinerary
HardDFSGraph
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1584.Min Cost to Connect All Points
MediumArrayUnion Find
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743.Network Delay Time
MediumDFSBFS
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778.Swim in Rising Water
HardArrayDFS
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269.Alien Dictionary
HardArrayString
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787.Cheapest Flights Within K Stops
MediumDynamic ProgrammingDFS
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70.Climbing Stairs
EasyMathDynamic Programming
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746.Min Cost Climbing Stairs
EasyArrayDynamic Programming
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198.House Robber
MediumArrayDynamic Programming
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213.House Robber II
MediumArrayDynamic Programming
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5.Longest Palindromic Substring
MediumStringDynamic Programming
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647.Palindromic Substrings
MediumStringDynamic Programming
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91.Decode Ways
MediumStringDynamic Programming
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322.Coin Change
MediumArrayDynamic Programming
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152.Maximum Product Subarray
MediumArrayDynamic Programming
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139.Word Break
MediumArrayHash Table
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300.Longest Increasing Subsequence
MediumArrayBinary Search
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416.Partition Equal Subset Sum
MediumArrayDynamic Programming
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62.Unique Paths
MediumMathDynamic Programming
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1143.Longest Common Subsequence
MediumStringDynamic Programming
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309.Best Time to Buy and Sell Stock with Cooldown
MediumArrayDynamic Programming
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518.Coin Change II
MediumArrayDynamic Programming
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494.Target Sum
MediumArrayDynamic Programming
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97.Interleaving String
MediumStringDynamic Programming
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329.Longest Increasing Path in a Matrix
HardArrayDFS
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115.Distinct Subsequences
HardStringDynamic Programming
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72.Edit Distance
MediumStringDynamic Programming
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312.Burst Balloons
HardArrayDynamic Programming
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10.Regular Expression Matching
HardStringDynamic Programming
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53.Maximum Subarray
MediumArrayDivide and Conquer
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55.Jump Game
MediumArrayDynamic Programming
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45.Jump Game II
MediumArrayDynamic Programming
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134.Gas Station
MediumArrayGreedy
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846.Hand of Straights
MediumArrayHash Table
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1899.Merge Triplets to Form Target Triplet
MediumArrayGreedy
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763.Partition Labels
MediumHash TableTwo Pointers
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678.Valid Parenthesis String
MediumStringDynamic Programming
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57.Insert Interval
MediumArray
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56.Merge Intervals
MediumArraySorting
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435.Non-overlapping Intervals
MediumArrayDynamic Programming
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252.Meeting Rooms
EasyArraySorting
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253.Meeting Rooms II
MediumArrayTwo Pointers
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1851.Minimum Interval to Include Each Query
HardArrayBinary Search
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48.Rotate Image
MediumArrayMath
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54.Spiral Matrix
MediumArrayMatrix
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73.Set Matrix Zeroes
MediumArrayHash Table
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202.Happy Number
EasyHash TableMath
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66.Plus One
EasyArrayMath
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50.Pow(x, n)
MediumMathRecursion
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43.Multiply Strings
MediumMathString
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2013.Detect Squares
MediumArrayHash Table
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136.Single Number
EasyArrayBit Manipulation
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191.Number of 1 Bits
EasyDivide and ConquerBit Manipulation
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338.Counting Bits
EasyDynamic ProgrammingBit Manipulation
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190.Reverse Bits
EasyDivide and ConquerBit Manipulation
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268.Missing Number
EasyArrayHash Table
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371.Sum of Two Integers
MediumMathBit Manipulation
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7.Reverse Integer
MediumMath
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