Introduction

记录数据结构与算法/LeetCode练习过程，将持续更新

• Array

  • Best Time To Buy And Sell Stock

    • 121.Best-Time-to-Buy-and-Sell-Stock

    • 122.Best-Time-to-Buy-and-Sell-Stock-II

    • 123.Best-Time-to-Buy-and-Sell-Stock-III

    • 188.Best-Time-to-Buy-and-Sell-Stock-IV

  • 1.Two-Sum

  • 1007.Minimum-Domino-Rotations-For-Equal-Row

  • 1031.Maximum-Sum-of-Two-Non-Overlapping-Subarrays

  • 1052.Grumpy-Bookstore-Owner

  • 11.Container-With-Most-Water

  • 1122.Relative-Sort-Array

  • 1163.Last-Substring-in-Lexicographical-Order

  • [118.Pascal's-Triangle](Array/118.Pascal's-Triangle.md)

  • 1181.Before-and-After-Puzzle

  • 1231.Divide-Chocolate

  • 1296.Divide-Array-in-Sets-of-K-Consecutive-Numbers

  • 1304.Find-N-Unique-Integers-Sum-up-to-Zero

  • 134.Gas-Station

  • 135.Candy

  • 1352.Product-of-the-Last-K-Numbers

  • 136.Single-Number

  • 14.Longest-Common-Prefix

  • 1477.Find-Two-Non-overlapping-Sub-arrays-Each-With-Target-Sum

  • 15.3Sum

  • 152.Maximum-Product-Subarray

  • 16.3Sum-Closest

  • 163.Missing-Ranges

  • 169.Majority-Element

  • 18.4Sum

  • 189.Rotate-Array

  • 204.Count-Primes

  • 215.Kth-Largest-Element-in-an-Array

  • 217.Contains-Duplicate

  • 219.Contains-Duplicate-II

  • 220.Contains-Duplicate-III

  • 228.Summary-Ranges

  • 229.Majority-Element-II

  • 238.Product-of-Array-Except-Self

  • 239.Sliding-Window-Maximum

  • 243.Shortest-Word-Distance

  • 252.Meeting-Rooms

  • 266.Palindrome-Permutation

  • 268.Missing-Number

  • 273.Integer-to-English-Words

  • 279.Perfect-Squares

  • 283.Move-Zeroes

  • 287.Find-the-Duplicate-Number

  • 29.Divide-Two-Integers

  • 299.Bulls-and-Cows

  • 31.Next-Permutation

  • 325.Maximum-Size-Subarray-Sum-Equals-k

  • 334.Increasing-Triplet-Subsequence

  • 340.Longest-Substring-with-At-Most-K-Distinct-Characters

  • 347.Top-K-Frequent-Elements

  • 349.Intersection-of-Two-Arrays

  • 350.Intersection-of-Two-Arrays-II

  • 354.Russian-Doll-Envelopes

  • 367.Valid-Perfect-Square

  • 378.Kth-Smallest-Element-in-a-Sorted-Matrix

  • 38.Count-and-Say

  • 383.Ransom-Note

  • 387.First-Unique-Character-in-a-String

  • 4.Median-of-Two-Sorted-Arrays

  • 406.Queue-Reconstruction-by-Height

  • 410.Split-Array-Largest-Sum

  • 412.Fizz-Buzz

  • 419.Battleships-in-a-Board

  • 435.Non-overlapping-Intervals

  • 438.Find-All-Anagrams-in-a-String

  • 442.Find-All-Duplicates-in-an-Array

  • 457.Circular-Array-Loop

  • 509.Fibonacci-Number

  • 53.Maximum-Subarray

  • 539.Minimum-Time-Difference

  • 540.Single-Element-in-a-Sorted-Array

  • 56.Merge-Intervals

  • 560.Subarray-Sum-Equals-K

  • 57.Insert-Interval

  • 575.Distribute-Candies

  • 581.Shortest-Unsorted-Continuous-Subarray

  • 593.Valid-Square

  • 6.ZigZag-Conversion

  • 609.Find-Duplicate-File-in-System

  • 611.Valid-Triangle-Number

  • 621.Task-Scheduler

  • 628.Maximum-Product-of-Three-Numbers

  • 632.Smallest-Range-Covering-Elements-from-K-Lists

  • 659.Split-Array-into-Consecutive-Subsequences

  • 67.Add-Binary

  • 670.Maximum-Swap

  • 7.Reverse-Integer

  • 717.1-bit-and-2-bit-Characters

  • 722.Remove-Comments

  • 724.Find-Pivot-Index

  • 763.Partition-Labels

  • 811.Subdomain-Visit-Count

  • 845.Longest-Mountain-in-Array

  • 846.Hand-of-Straights

  • 862.Shortest-Subarray-with-Sum-at-Least-K

  • 866.Prime-Palindrome

  • 881.Boats-to-Save-People

  • 937.Reorder-Data-in-Log-Files

  • 953.Verifying-an-Alien-Dictionary

  • 957.Prison-Cells-After-N-Days

  • 973.K-Closest-Points-to-Origin

  • 974.Subarray-Sums-Divisible-by-K

  • 995.Minimum-Number-of-K-Consecutive-Bit-Flips

  • Interleaving Positive And Negative Numbers

  • Maximum Subarray Difference

  • Maximum Subarray Ii

  • Merge Sorted Array Ii

  • Minimum Subarray

  • Partition Array

  • Recover Rotated Sorted Array

  • Subarray Sum Closest

  • Subarray Sum Zero

• Basic Knowledge

  • Binary Tree

  • Bit Operation

  • Heapify

  • Java Syntax

  • Monotonous Stack

  • Trie Tree

• Binary Search

  • 1011.Capacity-To-Ship-Packages-Within-D-Days

  • 1044.Longest-Duplicate-Substring

  • 1062.Longest-Repeating-Substring

  • 153.Find-Minimum-in-Rotated-Sorted-Array

  • 162.Find-Peak-Element

  • 278.First-Bad-Version

  • 33.Search-in-Rotated-Sorted-Array

  • 34.Find-First-and-Last-Position-of-Element-in-Sorted-Array

  • 35.Search-Insert-Position

  • [50.Pow(x,-n)](Binary-Search/50.Pow(x,-n).md)

  • [69.Sqrt(x)](Binary-Search/69.Sqrt(x).md)

  • 704.Binary-Search

  • 74.Search-a-2D-Matrix

  • 785.Is-Graph-Bipartite?

  • 796.Rotate-String

  • 81.Search-in-Rotated-Sorted-Array-II

  • Count Of Smaller Number

  • Median

  • Search In A Big Sorted Array

• Binary Tree

  • Serialize And Deserialize

    • 297.Serialize-and-Deserialize-Binary-Tree

    • 428.Serialize-and-Deserialize-N-ary-Tree

    • 449.Serialize-and-Deserialize-BST

  • 100.Same-Tree

  • 101.Symmetric-Tree

  • 1038.Binary-Search-Tree-to-Greater-Sum-Tree

  • 105.Construct-Binary-Tree-from-Preorder-and-Inorder-Traversal

  • 106.Construct-Binary-Tree-from-Inorder-and-Postorder-Traversal

  • 108.Convert-Sorted-Array-to-Binary-Search-Tree

  • 1110.Delete-Nodes-And-Return-Forest

  • 114.Flatten-Binary-Tree-to-Linked-List

  • 1145.Binary-Tree-Coloring-Game

  • 116.Populating-Next-Right-Pointers-in-Each-Node

  • 117.Populating-Next-Right-Pointers-in-Each-Node-II

  • 129.Sum-Root-to-Leaf-Numbers

  • 144.Binary-Tree-Preorder-Traversal

  • 199.Binary-Tree-Right-Side-View

  • 222.Count-Complete-Tree-Nodes

  • 226.Invert-Binary-Tree

  • 230.Kth-Smallest-Element-in-a-BST

  • 257.Binary-Tree-Paths

  • 270.Closest-Binary-Search-Tree-Value

  • 285.Inorder-Successor-in-BST

  • 337.House-Robber-III

  • 426.Convert-Binary-Search-Tree-to-Sorted-Doubly-Linked-List

  • 510.Inorder-Successor-in-BST-II

  • 543.Diameter-of-Binary-Tree

  • 617.Merge-Two-Binary-Trees

  • 652.Find-Duplicate-Subtrees

  • 653.Two-Sum-IV---Input-is-a-BST

  • 662.Maximum-Width-of-Binary-Tree

  • 669.Trim-a-Binary-Search-Tree

  • 889.Construct-Binary-Tree-from-Preorder-and-Postorder-Traversal

  • 938.Range-Sum-of-BST

  • 94.Binary-Tree-Inorder-Traversal

  • 951.Flip-Equivalent-Binary-Trees

  • 958.Check-Completeness-of-a-Binary-Tree

  • 979.Distribute-Coins-in-Binary-Tree

  • 987.Vertical-Order-Traversal-of-a-Binary-Tree

  • Search Range In Binary Search Tree

• Bit

  • 307.Range-Sum-Query---Mutable

  • 308.Range-Sum-Query-2D---Mutable

  • 315.Count-of-Smaller-Numbers-After-Self

  • 493.Reverse-Pairs

• Data Structure

  • Basic Calculator

    • 224.Basic-Calculator

    • 227.Basic-Calculator-II

    • 772.Basic-Calculator-III

    • Basic Claculator Iv

  • 1146.Snapshot-Array

  • 1152.Analyze-User-Website-Visit-Pattern

  • 1167.Minimum-Cost-to-Connect-Sticks

  • 1172.Dinner-Plate-Stacks

  • 1236.Web-Crawler

  • 128.Longest-Consecutive-Sequence

  • 146.LRU-Cache

  • 155.Min-Stack

  • 158.Read-N-Characters-Given-Read4-II---Call-multiple-times

  • 225.Implement-Stack-using-Queues

  • 232.Implement-Queue-using-Stacks

  • 253.Meeting-Rooms-II

  • 263.Ugly-Number

  • 271.Encode-and-Decode-Strings

  • [28.Implement-strStr()](Data-Structure/28.Implement-strStr().md)

  • 281.Zigzag-Iterator

  • 284.Peeking-Iterator

  • 295.Find-Median-from-Data-Stream

  • 314.Binary-Tree-Vertical-Order-Traversal

  • 332.Reconstruct-Itinerary

  • 341.Flatten-Nested-List-Iterator

  • 346.Moving-Average-from-Data-Stream

  • 348.Design-Tic-Tac-Toe

  • 353.Design-Snake-Game

  • 359.Logger-Rate-Limiter

  • 362.Design-Hit-Counter

  • [380.Insert-Delete-GetRandom-O(1)](Data-Structure/380.Insert-Delete-GetRandom-O(1).md)

  • [381.Insert-Delete-GetRandom-O(1)---Duplicates-allowed](Data-Structure/381.Insert-Delete-GetRandom-O(1)---Duplicates-allowed.md)

  • 384.Shuffle-an-Array

  • 41.First-Missing-Positive

  • 460.LFU-Cache

  • [470.Implement-Rand10()-Using-Rand7()](Data-Structure/470.Implement-Rand10()-Using-Rand7().md)

  • 49.Group-Anagrams

  • 523.Continuous-Subarray-Sum

  • 528.Random-Pick-with-Weight

  • 535.Encode-and-Decode-TinyURL

  • 545.Boundary-of-Binary-Tree

  • 572.Subtree-of-Another-Tree

  • 588.Design-In-Memory-File-System

  • 622.Design-Circular-Queue

  • 642.Design-Search-Autocomplete-System

  • 692.Top-K-Frequent-Words

  • 706.Design-HashMap

  • 707.Design-Linked-List

  • 729.My-Calendar-I

  • 731.My-Calendar-II

  • 759.Employee-Free-Time

  • 794.Valid-Tic-Tac-Toe-State

  • 84.Largest-Rectangle-in-Histogram

  • 843.Guess-the-Word

  • 900.RLE-Iterator

  • 937.Reorder-Data-in-Log-Files

  • 981.Time-Based-Key-Value-Store

  • 99.Recover-Binary-Search-Tree

  • Add And Search Word Data Structure Design

  • Heapify

  • Max Tree

  • Rehashing

  • Subarray Sum Zero

• Divide Conquer

  • 102.Binary-Tree-Level-Order-Traversal

  • 103.Binary-Tree-Zigzag-Level-Order-Traversal

  • 104.Maximum-Depth-of-Binary-Tree

  • 107.Binary-Tree-Level-Order-Traversal-II

  • 110.Balanced-Binary-Tree

  • 124.Binary-Tree-Maximum-Path-Sum

  • 173.Binary-Search-Tree-Iterator

  • 218.The-Skyline-Problem

  • 236.Lowest-Common-Ancestor-of-a-Binary-Tree

  • 450.Delete-Node-in-a-BST

  • 973.K-Closest-Points-to-Origin

  • 98.Validate-Binary-Search-Tree

  • Inorder

  • Insert Node In A Binary Search Tree

  • Postorder

  • Preorder

• Dynamic Programming

  • 1.position

    • 1048.Longest-String-Chain

    • 198.House-Robber

    • 256.Paint-House

    • 265.Paint-House-II

    • 32.Longest-Valid-Parentheses

    • 338.Counting-Bits

    • 361.Bomb-Enemy

    • 403.Frog-Jump

    • 45.Jump-Game-II

    • 518.Coin-Change-2

    • 55.Jump-Game

    • 62.Unique-Paths

    • 63.Unique-Paths-II

    • 64.Minimum-Path-Sum

    • 70.Climbing-Stairs

    • 72.Edit-Distance

    • 85.Maximal-Rectangle

    • 871.Minimum-Number-of-Refueling-Stops

    • 91.Decode-Ways

    • 97.Interleaving-String

    • 980.Unique-Paths-III

  • 2.sequence

    • Sell Stock

      • 188.Best-Time-to-Buy-and-Sell-Stock-IV

      • 309.Best-Time-to-Buy-and-Sell-Stock-with-Cooldown

    • 115.Distinct-Subsequences

    • 132.Palindrome-Partitioning-II

    • 300.Longest-Increasing-Subsequence

    • 472.Concatenated-Words

    • 516.Longest-Palindromic-Subsequence

    • 727.Minimum-Window-Subsequence

    • 801.Minimum-Swaps-To-Make-Sequences-Increasing

    • K Sum

    • Long Common Sequence

    • Maximum Subarray Iii

    • Minimum Adjustment Cost

  • Backpack Problem

    • 1155.Number-of-Dice-Rolls-With-Target-Sum

    • 322.Coin-Change

    • 416.Partition-Equal-Subset-Sum

    • Backpack Ii

    • Backpack Iii

    • Backpack

  • 区间型

    • 1000.Minimum-Cost-to-Merge-Stones

    • 1335.Minimum-Difficulty-of-a-Job-Schedule

    • 375.Guess-Number-Higher-or-Lower-II

    • 87.Scramble-String

    • Coins In A Line Iii

  • 矩阵坐标

    • 1277.Count-Square-Submatrices-with-All-Ones

    • 221.Maximal-Square

    • 741.Cherry-Pickup

  • 1049.Last-Stone-Weight-II

  • 1140.Stone-Game-II

  • 1235.Maximum-Profit-in-Job-Scheduling

  • 1320.Minimum-Distance-to-Type-a-Word-Using-Two-Fingers

  • 1406.Stone-Game-III

  • 774.Minimize-Max-Distance-to-Gas-Station

  • Longest Arithmetic Sequence

• Graph Search

  • Word Ladder

    • 126.Word-Ladder-II

    • 127.Word-Ladder

  • 10.Regular-Expression-Matching

  • 1041.Robot-Bounded-In-Circle

  • 1066.Campus-Bikes-II

  • 1087.Brace-Expansion

  • 1102.Path-With-Maximum-Minimum-Value

  • 113.Path-Sum-II

  • 1192.Critical-Connections-in-a-Network

  • 1197.Minimum-Knight-Moves

  • 1219.Path-with-Maximum-Gold

  • 1239.Maximum-Length-of-a-Concatenated-String-with-Unique-Characters

  • 1284.Minimum-Number-of-Flips-to-Convert-Binary-Matrix-to-Zero-Matrix

  • 1293.Shortest-Path-in-a-Grid-with-Obstacles-Elimination

  • 131.Palindrome-Partitioning

  • 133.Clone-Graph

  • 1345.Jump-Game-IV

  • 1376.Time-Needed-to-Inform-All-Employees

  • 139.Word-Break

  • 140.Word-Break-II

  • 1416.Restore-The-Array

  • 17.Letter-Combinations-of-a-Phone-Number

  • 179.Largest-Number

  • 200.Number-of-Islands

  • 212.Word-Search-II

  • 22.Generate-Parentheses

  • 248.Strobogrammatic-Number-III

  • 286.Walls-and-Gates

  • 289.Game-of-Life

  • 298.Binary-Tree-Longest-Consecutive-Sequence

  • 301.Remove-Invalid-Parentheses

  • 312.Burst-Balloons

  • 317.Shortest-Distance-from-All-Buildings

  • 320.Generalized-Abbreviation

  • 323.Number-of-Connected-Components-in-an-Undirected-Graph

  • 329.Longest-Increasing-Path-in-a-Matrix

  • 364.Nested-List-Weight-Sum-II

  • 386.Lexicographical-Numbers

  • 39.Combination-Sum

  • 399.Evaluate-Division

  • 40.Combination-Sum-II

  • 417.Pacific-Atlantic-Water-Flow

  • 430.Flatten-a-Multilevel-Doubly-Linked-List

  • 437.Path-Sum-III

  • 44.Wildcard-Matching

  • 463.Island-Perimeter

  • 465.Optimal-Account-Balancing

  • 489.Robot-Room-Cleaner

  • 490.The-Maze

  • 494.Target-Sum

  • 51.N-Queens

  • 515.Find-Largest-Value-in-Each-Tree-Row

  • 524.Longest-Word-in-Dictionary-through-Deleting

  • 529.Minesweeper

  • 547.Number-of-Provinces

  • 568.Maximum-Vacation-Days

  • 675.Cut-Off-Trees-for-Golf-Event

  • 679.24-Game

  • 695.Max-Area-of-Island

  • 698.Partition-to-K-Equal-Sum-Subsets

  • 721.Accounts-Merge

  • 733.Flood-Fill

  • 737.Sentence-Similarity-II

  • 743.Network-Delay-Time

  • 752.Open-the-Lock

  • 753.Cracking-the-Safe

  • 773.Sliding-Puzzle

  • 79.Word-Search

  • 802.Find-Eventual-Safe-States

  • 815.Bus-Routes

  • 818.Race-Car

  • 854.K-Similar-Strings

  • 863.All-Nodes-Distance-K-in-Binary-Tree

  • 864.Shortest-Path-to-Get-All-Keys

  • 909.Snakes-and-Ladders

  • 93.Restore-IP-Addresses

  • 95.Unique-Binary-Search-Trees-II

  • 96.Unique-Binary-Search-Trees

  • 994.Rotting-Oranges

• Linked List

  • Add Two Numbers

    • 2.Add-Two-Numbers

    • 445.Add-Two-Numbers-II

  • 109.Convert-Sorted-List-to-Binary-Search-Tree

  • 138.Copy-List-with-Random-Pointer

  • 141.Linked-List-Cycle

  • 142.Linked-List-Cycle-II

  • 143.Reorder-List

  • 148.Sort-List

  • 160.Intersection-of-Two-Linked-Lists

  • 19.Remove-Nth-Node-From-End-of-List

  • 206.Reverse-Linked-List

  • 21.Merge-Two-Sorted-Lists

  • 23.Merge-k-Sorted-Lists

  • 234.Palindrome-Linked-List

  • 237.Delete-Node-in-a-Linked-List

  • 24.Swap-Nodes-in-Pairs

  • 25.Reverse-Nodes-in-k-Group

  • 328.Odd-Even-Linked-List

  • 369.Plus-One-Linked-List

  • 61.Rotate-List

  • 82.Remove-Duplicates-from-Sorted-List-II

  • 83.Remove-Duplicates-from-Sorted-List

  • 86.Partition-List

  • 876.Middle-of-the-Linked-List

  • 92.Reverse-Linked-List-II

  • Remove Duplicates From Unsorted List Geeksforgeeks

• Matrix

  • Spiral Matrix

    • 54.Spiral-Matrix

    • 59.Spiral-Matrix-II

  • 1074.Number-of-Submatrices-That-Sum-to-Target

  • 1292.Maximum-Side-Length-of-a-Square-with-Sum-Less-than-or-Equal-to-Threshold

  • 240.Search-a-2D-Matrix-II

  • 296.Best-Meeting-Point

  • 304.Range-Sum-Query-2D---Immutable

  • 311.Sparse-Matrix-Multiplication

  • 36.Valid-Sudoku

  • 363.Max-Sum-of-Rectangle-No-Larger-Than-K

  • 37.Sudoku-Solver

  • 48.Rotate-Image

  • 498.Diagonal-Traverse

  • 562.Longest-Line-of-Consecutive-One-in-Matrix

  • 723.Candy-Crush

  • 73.Set-Matrix-Zeroes

  • 835.Image-Overlap

  • 939.Minimum-Area-Rectangle

  • 963.Minimum-Area-Rectangle-II

  • 986.Interval-List-Intersections

  • Friend Circles

• Mergesort

  • Algorithm Swap

• Numbers

  • 1088.Confusing-Number-II

  • 13.Roman-to-Integer

  • 166.Fraction-to-Recurring-Decimal

  • 202.Happy-Number

  • 65.Valid-Number

  • 681.Next-Closest-Time

  • 780.Reaching-Points

  • 829.Consecutive-Numbers-Sum

  • 914.X-of-a-Kind-in-a-Deck-of-Cards

  • 991.Broken-Calculator

• Other

  • 1185.Day-of-the-Week

  • 149.Max-Points-on-a-Line

  • 176.Second-Highest-Salary

  • 20.Valid-Parentheses

  • 277.Find-the-Celebrity

  • 612.Shortest-Distance-in-a-Plane

  • [8.String-to-Integer-(atoi)](Other/8.String-to-Integer-(atoi).md)

• Permutation And Combination

  • 46.Permutations

  • 47.Permutations-II

  • 60.Permutation-Sequence

  • 77.Combinations

  • 78.Subsets

  • 90.Subsets-II

• Queue

  • 480.Sliding-Window-Median

  • 853.Car-Fleet

  • 862.Shortest-Subarray-with-Sum-at-Least-K

  • 950.Reveal-Cards-In-Increasing-Order

• Sort Algorithm

  • 1057.Campus-Bikes

  • 969.Pancake-Sorting

  • Bubble Sort

  • Merge Sort

  • Quick Sort

• Stack

  • 1130.Minimum-Cost-Tree-From-Leaf-Values

  • 1249.Minimum-Remove-to-Make-Valid-Parentheses

  • 379.Design-Phone-Directory

  • 394.Decode-String

  • 402.Remove-K-Digits

  • 456.132-Pattern

  • 496.Next-Greater-Element-I

  • 503.Next-Greater-Element-II

  • 636.Exclusive-Time-of-Functions

  • 71.Simplify-Path

  • 739.Daily-Temperatures

  • 844.Backspace-String-Compare

  • 917.Reverse-Only-Letters

  • 946.Validate-Stack-Sequences

• String

  • 1055.Shortest-Way-to-Form-String

  • 1096.Brace-Expansion-II

  • 1100.Find-K-Length-Substrings-With-No-Repeated-Characters

  • 1153.String-Transforms-Into-Another-String

  • 12.Integer-to-Roman

  • 125.Valid-Palindrome

  • 151.Reverse-Words-in-a-String

  • 161.One-Edit-Distance

  • 165.Compare-Version-Numbers

  • 168.Excel-Sheet-Column-Title

  • 171.Excel-Sheet-Column-Number

  • 205.Isomorphic-Strings

  • 214.Shortest-Palindrome

  • 242.Valid-Anagram

  • 3.Longest-Substring-Without-Repeating-Characters

  • 344.Reverse-String

  • 415.Add-Strings

  • 43.Multiply-Strings

  • 443.String-Compression

  • 459.Repeated-Substring-Pattern

  • 482.License-Key-Formatting

  • 5.Longest-Palindromic-Substring

  • 556.Next-Greater-Element-III

  • 557.Reverse-Words-in-a-String-III

  • 567.Permutation-in-String

  • 640.Solve-the-Equation

  • 68.Text-Justification

  • 726.Number-of-Atoms

  • 736.Parse-Lisp-Expression

  • 767.Reorganize-String

  • 784.Letter-Case-Permutation

  • 792.Number-of-Matching-Subsequences

  • 809.Expressive-Words

  • 819.Most-Common-Word

  • 833.Find-And-Replace-in-String

• Toposort

  • 1136.Parallel-Courses

  • 207.Course-Schedule

  • 210.Course-Schedule-II

  • 269.Alien-Dictionary

  • 444.Sequence-Reconstruction

  • 468.Validate-IP-Address

  • Topological Sorting

• Trie Tree

  • 1032.Stream-of-Characters

  • 1268.Search-Suggestions-System

  • [208.Implement-Trie-(Prefix-Tree)](Trie-Tree/208.Implement-Trie-(Prefix-Tree).md)

  • 336.Palindrome-Pairs

• Two Pointers

  • 1004.Max-Consecutive-Ones-III

  • 1099.Two-Sum-Less-Than-K

  • 159.Longest-Substring-with-At-Most-Two-Distinct-Characters

  • 167.Two-Sum-II---Input-array-is-sorted

  • 26.Remove-Duplicates-from-Sorted-Array

  • 27.Remove-Element

  • 340.Longest-Substring-with-At-Most-K-Distinct-Characters

  • 42.Trapping-Rain-Water

  • 647.Palindromic-Substrings

  • 680.Valid-Palindrome-II

  • 75.Sort-Colors

  • 76.Minimum-Window-Substring

  • 88.Merge-Sorted-Array

  • Sort Colors Ii

• Union Find

  • 1168.Optimize-Water-Distribution-in-a-Village

  • 803.Bricks-Falling-When-Hit

  • 924.Minimize-Malware-Spread

  • 947.Most-Stones-Removed-with-Same-Row-or-Column