Top Questions in 6 months in 2022 Aug

• 1396.Design Underground System
• 1656.Design an Ordered Stream // todo
• 380.Insert Delete GetRandom O(1)
• 394.Decode String
• 430.Flatten a Multilevel Doubly Linked List
• 1169.Invalid Transactions
• 1209.Remove All Adjacent Duplicates in String II
• 1029.Two City Scheduling
• 1244.Design A Leaderboard
• 1274.Number of Ships in a Rectangle
• 723.Candy Crush
• 1472.Design Browser History
• 253.Meeting Rooms II
• 935.Knight Dialer
• 140.Word Break II
• 1347.Minimum Number of Steps to Make Two Strings Anagramdifficulty=1
• 797.All Paths From Source to Target
• 56.Merge Intervals
• 146.LRU Cache
• 42.Trapping Rain Water
• 445.Add Two Numbers II
• 314.Binary Tree Vertical Order Traversaldifficulty=1
• 428.Serialize and Deserialize N-ary Treedifficulty=2
• 1553.Minimum Number of Days to Eat N Orangesdifficulty=2
• 79.Word Search
• 716.Max Stack
• 1583.Count Unhappy Friends
• 1354.Construct Target Array With Multiple Sums
• 3.Longest Substring Without Repeating Characters
• 611.Valid Triangle Number
• 1570.Dot Product of Two Sparse Vectorsdifficulty=1
• 1332.Remove Palindromic Subsequences
• 117.Populating Next Right Pointers in Each Node II
• 1698.Number of Distinct Substrings in a String
• 1249.Minimum Remove to Make Valid Parenthesesdifficulty=1
• 311.Sparse Matrix Multiplication
• 987.Vertical Order Traversal of a Binary Tree
• 1331.Rank Transform of an Array
• 858.Mirror Reflection
• 1790.Check if One String Swap Can Make Strings Equal
• 289.Game of Life
• 2276.Count Integers in Intervals
• 20.Valid Parentheses
• 420.Strong Password Checker
• 1229.Meeting Scheduler
• 443.String Compression
• 1614.Maximum Nesting Depth of the Parenthesesdifficulty=0
• 312.Burst Balloons
• 333.Largest BST Subtree
• 2.Add Two Numbers
• 121.Best Time to Buy and Sell Stock
• 242.Valid Anagram
• 381.Insert Delete GetRandom O(1) - Duplicates allowed
• 390.Elimination Game
• 283.Move Zeroes
• 1854.Maximum Population Year
• 856.Score of Parentheses
• 387.First Unique Character in a Stringdifficulty=0
• 39.Combination Sum
• 492.Construct the Rectangle
• 257.Binary Tree Paths
• 766.Toeplitz Matrix
• 31.Next Permutation
• 1358.Number of Substrings Containing All Three Charactersdifficulty=1
• 665.Non-decreasing Array
• 4.Median of Two Sorted Arrays
• 22.Generate Parentheses
• 2248.Intersection of Multiple Arrays
• 13.Roman to Integer
• 545.Boundary of Binary Tree
• 399.Evaluate Division
• 744.Find Smallest Letter Greater Than Targetdifficulty=0
• 659.Split Array into Consecutive Subsequences
• 895.Maximum Frequency Stack
• 881.Boats to Save People
• 78.Subsetsdifficulty=1
• 5.Longest Palindromic Substring
• 1547.Minimum Cost to Cut a Stick
• 138.Copy List with Random Pointer
• 849.Maximize Distance to Closest Persondifficulty=1
• 697.Degree of an Array
• 1192.Critical Connections in a Networkdifficulty=2
• 174.Dungeon Game
• 51.N-Queens
• 791.Custom Sort String
• 1647.Minimum Deletions to Make Character Frequencies Unique
• 200.Number of Islands
• 99.Recover Binary Search Tree
• 1636.Sort Array by Increasing Frequencydifficulty=0
• 133.Clone Graph
• 1823.Find the Winner of the Circular Gamedifficulty=1
• 1338.Reduce Array Size to The Half
• 238.Product of Array Except Self
• 863.All Nodes Distance K in Binary Treedifficulty=1
• 516.Longest Palindromic Subsequence
• 1207.Unique Number of Occurrences
• 116.Populating Next Right Pointers in Each Node
• 695.Max Area of Island
• 934.Shortest Bridge
• 322.Coin Change
• 1.Two Sumdifficulty=0
• 496.Next Greater Element I
• 349.Intersection of Two Arrays
• 155.Min Stack
• 341.Flatten Nested List Iterator
• 583.Delete Operation for Two Stringsdifficulty=1
• 34.Find First and Last Position of Element in Sorted Array
• 413.Arithmetic Slices
• 566.Reshape the Matrix
• 68.Text Justification
• 269.Alien Dictionary
• 139.Word Break
• 315.Count of Smaller Numbers After Selfdifficulty=2
• 123.Best Time to Buy and Sell Stock IIIdifficulty=2
• 113.Path Sum II
• 29.Divide Two Integers
• 875.Koko Eating Bananas
• 18.4Sumdifficulty=1
• 98.Validate Binary Search Tree
• 867.Transpose Matrix
• 437.Path Sum III
• 986.Interval List Intersections
• 126.Word Ladder II
• 912.Sort an Array
• 332.Reconstruct Itinerary
• 366.Find Leaves of Binary Tree
• 698.Partition to K Equal Sum Subsetsdifficulty=1
• 72.Edit Distance
• 128.Longest Consecutive Sequence
• 183.Customers Who Never Order
• 767.Reorganize String
• 86.Partition List
• 264.Ugly Number II
• 417.Pacific Atlantic Water Flow
• 240.Search a 2D Matrix II
• 60.Permutation Sequence
• 122.Best Time to Buy and Sell Stock IIdifficulty=1
• 236.Lowest Common Ancestor of a Binary Treedifficulty=1
• 135.Candydifficulty=2
• 441.Arranging Coins
• 33.Search in Rotated Sorted Array
• 493.Reverse Pairs
• 127.Word Ladder
• 252.Meeting Rooms
• 338.Counting Bits
• 1710.Maximum Units on a Truck
• 15.3Sumdifficulty=1
• 64.Minimum Path Sum
• 73.Set Matrix Zeroes
• 451.Sort Characters By Frequency
• 300.Longest Increasing Subsequence
• 258.Add Digits
• 10.Regular Expression Matching
• 217.Contains Duplicate
• 179.Largest Number
• 450.Delete Node in a BST
• 404.Sum of Left Leaves
• 215.Kth Largest Element in an Array
• 503.Next Greater Element II
• 84.Largest Rectangle in Histogram
• 177.Nth Highest Salary
• 40.Combination Sum II
• 12.Integer to Roman
• 50.Pow(x, n)
• 350.Intersection of Two Arrays II
• 374.Guess Number Higher or Lower
• 67.Add Binary
• 2011.Final Value of Variable After Performing Operationsdifficulty=0
• 239.Sliding Window Maximum
• 45.Jump Game II
• 21.Merge Two Sorted Lists
• 511.Game Play Analysis I
• 1143.Longest Common Subsequence
• 44.Wildcard Matching
• 134.Gas Station
• 198.House Robber
• 181.Employees Earning More Than Their Managers
• 746.Min Cost Climbing Stairs
• 518.Coin Change 2
• 32.Longest Valid Parentheses
• 1470.Shuffle the Array
• 733.Flood Fill
• 47.Permutations II
• 212.Word Search II
• 17.Letter Combinations of a Phone Numberdifficulty=1
• 206.Reverse Linked List
• 692.Top K Frequent Words
• 118.Pascal’s Triangle
• 543.Diameter of Binary Tree
• 542.01 Matrix
• 46.Permutations
• 295.Find Median from Data Stream
• 844.Backspace String Compare
• 43.Multiply Strings
• 209.Minimum Size Subarray Sum
• 326.Power of Three
• 234.Palindrome Linked List
• 347.Top K Frequent Elements
• 90.Subsets II
• 213.House Robber II
• 237.Delete Node in a Linked List
• 16.3Sum Closest
• 53.Maximum Subarray
• 145.Binary Tree Postorder Traversal
• 49.Group Anagrams
• 9.Palindrome Number
• 162.Find Peak Element
• 724.Find Pivot Index
• 160.Intersection of Two Linked Listsdifficulty=0
• 199.Binary Tree Right Side View
• 35.Search Insert Position
• 231.Power of Two
• 125.Valid Palindrome
• 83.Remove Duplicates from Sorted Listdifficulty=0
• 7.Reverse Integer
• 202.Happy Number
• 54.Spiral Matrix
• 191.Number of 1 Bits
• 392.Is Subsequence
• 235.Lowest Common Ancestor of a Binary Search Tree
• 268.Missing Number
• 207.Course Schedule
• 62.Unique Paths
• 167.Two Sum II - Input Array Is Sorteddifficulty=1
• 169.Majority Element
• 74.Search a 2D Matrix
• 509.Fibonacci Number
• 226.Invert Binary Tree
• 102.Binary Tree Level Order Traversaldifficulty=1
• 88.Merge Sorted Array
• 19.Remove Nth Node From End of List
• 11.Container With Most Water
• 26.Remove Duplicates from Sorted Arraydifficulty=0
• 14.Longest Common Prefix
• 704.Binary Search
• 48.Rotate Image