说明

• 记录LeetCode题解，日更
• 题解语言为Java
• CSDN：https://blog.csdn.net/zhou373986278
• 欢迎大家指正(^▽^)

已解题目

按分类

• 数组
• 哈希表
• 树
• 链表
• 动态规划
• 字符串
• 二分查找
• 滑动窗口
• 位运算
• 深度优先遍历
• 数据库
• 图
• 贪婪算法

按题号

• 1.Two Sum
• 2.Add Two Numbers
• 3.Longes Substring Without Repeating Characters
• 4.Median of Two Sorted Arrays
• 5.Longest Palindromic Substring
• 7.Reverse Integer
• 9.Palindrome Number
• 10.Regular Expression Matching
• 12.Integer to Roman
• 13.Roman to Integer
• 14.Longest Common Prefix
• 15.3 Sum
• 17.Letter Combinations of a Phone Number
• 18.4 Sum
• 19.Remove Nth Node From End of List
• 20.Valid Parentheses
• 21.Merge Two Sorted Lists
• 22.Generate Parentheses
• 23.Merge K Sorted Lists
• 24.Swap Nodes In Pairs
• 25.Reverse Nodes In K-Group
• 28.Implement strStr()
• 29.Divide Two Integers
• 32.Longest Valid Parentheses
• 33.Searching Rotated Sorted Array
• 34.Find First and Last Position of Elementin Sorted Array
• 36.Valid Sudoku
• 37.Sudoku Solver
• 38.Count and Say
• 46.Permutations
• 47.Permutations II
• 49.Group Anagrams
• 50.pow(x,n)
• 51.N-Queens
• 52.N-Queens II
• 53.Maximum Subarray
• 54.Spiral Matrix
• 55.Jump Game
• 56.Merge Intervals
• 58.Length of Last Word
• 60.Permutation Sequence
• 61.Rotate List
• 62.Unique Paths
• 63.Unique Paths II
• 64.Minimum Path Sum
• 67.Add Binary
• 69.Sqrt(x)
• 70.Climbing Stairs
• 72.Edit Distance
• 74.Search A 2D Matrix
• 77.Combinations
• 78.Subsets
• 79.Word Search
• 81.Searchin Rotated Sorted Array II
• 82.Remove Duplicates From Sorted List II
• 83.Remove Duplicates from Sorted List
• 86.Partition List
• 89.Gray Code
• 90.Subsets II
• 91.Decode Ways
• 92.Reverse Linked List II
• 93.Restore IP Addresses
• 94.Binary Tree Inorder Traversal
• 95.Unique Binary Search Trees II
• 96.Unique Binary Search Trees
• 98.Validate Binary Search Tree
• 99.Recover Binary Search Tree
• 100.Same Tree
• 101.Symmetric Tree
• 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
• 108. Convert Sorted Array to Binary Search Tree
• 109.Convert Sorted List to Binary Search Tree
• 110.Balanced Binary Tree
• 111.Minimum Depth of Binary Tree
• 112.Path Sum
• 113. Path Sum II
• 114.Flatten Binary Tree To Linked List
• 116.Populating Next Right Pointers in Each Node
• 117.Populating Next Right Pointers in Each Node II
• 120.Triangle
• 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
• 124.Binary Tree Maximum Path Sum
• 125.Valid Palindrome
• 129.Sum Root to Leaf Numbers
• 130.Surrounded Regions
• 131.Palindrome Partitioning
• 133.Clone Graph
• 136.Single Number
• 139.Word Break
• 141.Linked List Cycle
• 142.Linked List Cycle II
• 143.Reorder List
• 144.Binary Tree Preorder Traversal
• 145. Binary Tree Postorder Traversal
• 147.Insertion Sort List
• 152.Maximum Product Subarray
• 153.Find Minimum in Rotated Sorted Array
• 154.Find Minimum in Rotated Sorted Array II
• 156.Binary Tree Upside Down
• 159. Longest Substring with At Most Two Distinct Characters
• 160.Intersection Of Two Linked Lists
• 162.Find Peak Element
• 163.Missing Ranges
• 170.TwoSum III
• 173.Binary Search Tree Iterator
• 175.Combine Two Tables
• 176.Second 20Highest Salary
• 177.Nth Highest Salary
• 178.Rank Scores
• 180.Consecutive Numbers
• 181.Employees Earning More Than Their Managers
• 182.Duplicate Emails
• 183.Customers Who Never Order
• 184.Department Highest Salary
• 185.Department Top Three Salaries
• 187.Repeated DNA Sequences
• 190.ReverseBits
• 191.Number Of 1 Bits
• 196.Delete Duplicate Emails
• 197.Rising Temperature
• 198.House Robber
• 199.Binary Tree Right Side View
• 200.Number of Islands
• 202.Happy Number
• 203.Remove Linked List Elements
• 204.Count Primes
• 205.Isomorphic Strings
• 206.Reverse Linked List
• 207.Course Schedule
• 209.Minimum Size Subarray Sum
• 210.Course Schedule II
• 213.House Robber II
• 221.Maximal Square
• 222.Count Complete Tree Nodes
• 226.Invert Binary Tree
• 230. Kth Smallest Element in a BST
• 234.Palindrome Linked List
• 235.Lowest Common Ancestor of a Binary Search Tree
• 236.Lowest Common Ancestor of a Binary Tree
• 237.Delete Node In A LinkedList
• 240.Search a 2D Matrix II
• 242.Valid Anagram
• 244.Shortest Word Distance II
• 246.Strobo grammatic Number
• 249.Group Shifted Strings
• 250.Count Univalue Subtrees
• 254.Factor Combinations
• 255.Verify Preorder Sequence in Binary Search Tree
• 256.Paint House
• 257.Binary Tree Paths
• 261.Graph Valid Tree
• 264.Ugly Number
• 266.Palindrome Permutation
• 269.Alien Dictionary
• 270.Closest Binary Search Tree Value
• 272.Closest Binary Search Tree Value II
• 274.H-Index
• 275.H-Index II
• 276.Paint Fence
• 277.Find The Celebrity
• 278.First Bad Version
• 279.Perfect Squares
• 285.Inorder Successor in BST
• 287.FindTheDuplicateNumber
• 290.Word Pattern
• 293.Flip Game
• 294.Flip Game II
• 297.Serialize and Deserialize Binary Tree
• 298.Binary Tree Longest Consecutive Sequence
• 299.Bulls And Cows
• 300.Longest Increasing Subsequence
• 303.Range Sum Query - Immutable
• 304.Range Sum Query 2D - Immutable
• 306.Additive Number
• 309.Best Time to Buy and Sell Stock with Cooldown
• 310.Minimum Height Trees
• 311.Sparse Matrix Multiplication
• 312.Burst Balloons
• 320.Generalized Abbreviation
• 322.Coin Change
• 323.Number of Connected Components in an Undirected Graph
• 328.Odd Even Linked List
• 333.Largest BST Subtree
• 344.Reverse String
• 337.House Robber III
• 338.Counting Bits
• 339.Nested List Weight Sum
• 343.Integer Break
• 345.Reverse Vowels of a String
• 347. Top K Frequent Elements
• 349.Intersection of Two Arrays
• 350.Intersection of Two Arrays II
• 357.Count Numbers with Unique Digits
• 359.Logger Rate Limiter
• 361.Bomb Enemy
• 366.Find Leaves of Binary Tree
• 367.Valid Perfect Square
• 369.Plus One Linked List
• 374.Guess Number Higher or Lower
• 377.Combination Sum IV
• 378.Kth Smallest Element In A Sorted Matrix
• 379.Design Phone Directory
• 383.Ransom Note
• 387.First Unique Character in a String
• 389.Find The Difference
• 392.Is Subsequence
• 394.Decode String
• 401.Binary Watch
• 404.Sum of Left Leaves
• 409.Longest Palindrome
• 413.Arithmetic Slices
• 415.Add Strings
• 416.Partition Equal Subset Sum
• 426.Convert Binary Search Tree to Sorted Doubly Linked List
• 428.Serialize and Deserialize N-ary Tree
• 429.N-ary Tree Level Order Traversal
• 431.Encode N-ary Tree to Binary Tree
• 434.Number of Segments in a String
• 437.Path Sum III
• 441.Arranging Coins
• 445.Add Two Numbers II
• 447.Number of Boomerangs
• 449.Serialize and Deserialize BST
• 450.Delete Node in a BST
• 451. Sort Characters By Frequency
• 454.4Sum II
• 459.Repeated Substring Pattern
• 463.Island Perimeter
• 474.Ones and Zeroes
• 486.Predict the Winner
• 494.Target Sum
• 500.Keyboard Row
• 501.Find Mode in Binary Search Tree
• 508.Most Frequent Subtree Sum
• 510.Inorder Successor in BST II
• 511.Game Play Analysis I
• 512.Game Play Analysis II
• 513.Find Bottom Left Tree Value
• 515.Find Largest Value in Each Tree Row
• 516.Longest Palindromic Subsequence
• 520.Detect Capital
• 521.Longest Uncommon Subsequence I
• 526.Beautiful Arrangement
• 528.Random Pick with Weight
• 530.Minimum Absolute Difference in BST
• 535.Encode and Decode TinyURL
• 536. Construct Binary Tree from String
• 537.Complex Number Multiplication
• 538.Convert BST to Greater Tree
• 541.Reverse String II
• 543.Diameter of Binary Tree
• 547.Friend Circles
• 549.Binary Tree Longest Consecutive Sequence II
• 551.Student Attendance Record I
• 554.Brick Wall
• 557.Reverse Words in a String III
• 559.Maximum Depth of N-ary Tree
• 560.Subarray Sum Equals K
• 563.Binary Tree Tilt
• 572.Subtree of Another Tree
• 575.Distribute Candies
• 582.Kill Process
• 589. N-ary Tree Preorder Traversal
• 590. N-ary Tree Postorder Traversal
• 594.Longest Harmonious Subsequence
• 599.Minimum Index Sum of Two Lists
• 606.Construct String from Binary Tree
• 609.Find Duplicate File in System
• 617.Merge Two Binary Trees
• 623.Add One Row to Tree
• 637.Average of Levels in Binary Tree
• 638.Shopping Offers
• 646.Maximum Length of Pair Chain
• 647.Palindromic Substrings
• 648.Word Replace
• 650.2 Keys Keyboard
• 651.4 Keys Keyboard
• 652.Find Duplicate Subtrees
• 654.Maximum Binary Tree
• 655.Print Binary Tree
• 657.Robot Return to Origin
• 658.Find K Closest Elements
• 662.Maximum Width of Binary Tree
• 663.Equal Tree Partition
• 666.Path Sum IV
• 669.Trim a Binary Search Tree
• 670.Maximum Swap
• 671.Second Minimum Node In a Binary Tree
• 676.Implement Magic Dictionary
• 680.Valid Palindrome II
• 686.Repeated String Match
• 687.Longest Univalue Path
• 690.Employee Importance
• 692.Top K Frequent Words
• 694.Number of Distinct Islands
• 696.Count Binary Substrings
• 700. Search in a Binary Search Tree
• 701.Insert Into A Binary Search Tree
• 702.Search in a Sorted Array of Unknown Size
• 704.Binary Search
• 705.Design Hash Set
• 709.To Lower Case
• 712.Minimum ASCII Delete Sum for Two Strings
• 714.Best Time to Buy and Sell Stock with Transaction Fee
• 718.Maximum Length of Repeated Subarray
• 725.Split Linked List In Parts
• 748.Shortest Completing Word
• 750.Number Of Corner Rectangles
• 771.Jewels And Stones
• 729.My Calendar I
• 733.Flood Fill
• 734. Sentence Similarity
• 739.Daily Temperatures
• 740.Delete and Earn
• 744.Find Smallest Letter Greater Than Target
• 746.Min Cost Climbing Stairs
• 760.Find Anagram Mappings
• 765.Couples Holding Hands
• 783.Minimum Distance Between BST Nodes
• 784.Letter Case Permutation
• 788.Rotated Digits
• 791.Custom Sort String
• 800.Similar RGB Color
• 804.Unique Morse Code Words
• 813.Largest Sum of Averages
• 814.Binary Tree Pruning
• 817.Linked List Components
• 819.Most Common Word
• 824.Goat Latin
• 825.Friends Of Appropriate Ages
• 842.Split Array into Fibonacci Sequence
• 852.Peak Index in a Mountain Array
• 859.Buddy Strings
• 860.Lemonade Change
• 862.Shortest Subarray with Sum at Least K
• 872.Leaf-Similar Trees
• 873.Length of Longest Fibonacci Subsequence
• 876.Middle Of The LinkedList
• 877.Stone Game
• 881.Subdomain Visit Count
• 884.Uncommon Words from Two Sentences
• 889.Construct Binary Tree from Preorder and Postorder Traversal
• 890.Find and Replace Pattern
• 893.Groups of Special-Equivalent Strings
• 894.All Possible Full Binary Trees
• 897.Increasing Order Search Tree
• 900.RLEIterator
• 911.Online Election
• 915.Partition Array into Disjoint Intervals
• 917.Reverse Only Letters
• 925.Long Pressed Name
• 926.Flip String To Monotone Increasing
• 929.Unique Email Addresses
• 931.Minimum Falling Path Sum
• 937.Reorder Log Files
• 938.Range Sum Of BST
• 944.Delete Columns to Make Sorted
• 945.Minimum Increment to Make Array Unique
• 951.Flip Equivalent Binary Trees
• 953.Verifying an Alien Dictionary
• 958.Check Completeness of a Binary Tree
• 961. N-Repeated Element in Size 2N Array
• 962.Maximum Width Ramp
• 965.Univalued Binary Tree
• 968.Binary Tree Cameras
• 979.Distribute Coins in Binary Tree
• 983.Minimum Cost For Tickets
• 987.Vertical Order Traversal of a Binary Tree
• 988.Smallest String Starting From Leaf
• 993.Cousins in Binary Tree
• 1007.Minimum Domino Rotations For Equal Row
• 1008.Construct Binary Search Tree from Preorder Traversal
• 1011.Capacity To Ship Packages Within D Days
• 1014.Best Sightseeing Pair
• 1022.Sum of Root To Leaf Binary Numbers
• 1025.Divisor Game
• 1026.Maximum Difference Between Node and Ancestor
• 1028.Recover a Tree From Preorder Traversal
• 1029.Two City Scheduling
• 1046.Last Stone Weight
• 1060.Missing Element in Sorted Array
• 1064.Fixed Point
• 1071.Greatest Common Divisor of Strings
• 1078.Occurrences After Bigram
• 1079.Letter Tile Possibilities
• 1119.Remove Vowels from a String
• 1120.Maximum Average Subtree