• LeetCode题目集
  • 介绍
  • 分类
    • Stack
      • Valid Parentheses
      • Trapping Rain Water
      • Simplify Path
      • Largest Rectangle in Histogram
      • Maximal Rectangle
      • Binary Tree Inorder Traversal
      • Binary Tree Zigzag Level Order Traversal
      • Binary Tree Preorder Traversal
      • Binary Tree Postorder Traversal
      • Evaluate Reverse Polish Notation
      • Min Stack
      • Binary Search Tree Iterator
      • Flatten Nested List Iterator
      • Mini Parser
      • Decode String
      • Remove K Digits
      • 132 Pattern
      • Next Greater Element I
      • Next Greater Element II
      • Tag Validator
      • Exclusive Time of Functions
      • Baseball Game
      • Number of Atoms
      • Asteroid Collision
      • Daily Temperatures
      • Basic Calculator IV
      • Basic Calculator
      • Implement Stack using Queues
      • Implement Queue using Stacks
      • Backspace String Compare
      • Remove Duplicate Letters
      • Verify Preorder Serialization of a Binary Tree
      • Car Fleet
      • Score of Parentheses
      • Decoded String at Index
      • Maximum Frequency Stack
      • Online Stock Span
      • Sum of Subarray Minimums
    • Heap
      • Merge k Sorted Lists
      • Top K Frequent Elements
      • Design Twitter
      • Find K Pairs with Smallest Sums
      • Kth Smallest Element in a Sorted Matrix
      • Trapping Rain Water II
      • Sort Characters By Frequency
      • IPO
      • Split Array into Consecutive Subsequences
      • Top K Frequent Words
      • Find K-th Smallest Pair Distance
      • Network Delay Time
      • Reorganize String
      • Swim in Rising Water
      • K-th Smallest Prime Fraction
      • Cheapest Flights Within K Stops
      • Race Car
      • Kth Largest Element in an Array
      • The Skyline Problem
      • Sliding Window Maximum
      • Ugly Number II
      • Super Ugly Number
      • Minimum Cost to Hire K Workers
      • Shortest Path to Get All Keys
      • Kth Largest Element in a Stream
      • Reachable Nodes In Subdivided Graph
      • Find Median from Data Stream
    • Greedy
      • Wildcard Matching
      • Jump Game II
      • Jump Game
      • Best Time to Buy and Sell Stock II
      • Gas Station
      • Candy
      • Is Subsequence
      • Remove K Digits
      • Queue Reconstruction by Height
      • Minimum Number of Arrows to Burst Balloons
      • Non-overlapping Intervals
      • Assign Cookies
      • IPO
      • Dota2 Senate
      • Course Schedule III
      • Task Scheduler
      • Split Array into Consecutive Subsequences
      • Best Time to Buy and Sell Stock with Transaction Fee
      • Monotone Increasing Digits
      • Set Intersection Size At Least Two
      • Partition Labels
      • Couples Holding Hands
      • Reorganize String
      • Split Array into Fibonacci Sequence
      • Remove Duplicate Letters
      • Create Maximum Number
      • Patching Array
      • Lemonade Change
      • Score After Flipping Matrix
      • Walking Robot Simulation
      • Boats to Save People
      • Wiggle Subsequence
      • Stamping The Sequence
    • Sort
      • Merge Intervals
      • Insert Interval
      • Sort Colors
      • Insertion Sort List
      • Sort List
      • Longest Word in Dictionary through Deleting
      • Reorganize String
      • Maximum Gap
      • Largest Number
      • Valid Anagram
      • H-Index
      • Wiggle Sort II
      • Random Pick with Blacklist
      • Intersection of Two Arrays
      • Intersection of Two Arrays II
    • Bit Manipulation
      • Subsets
      • Single Number
      • Single Number II
      • Repeated DNA Sequences
      • Power of Two
      • Counting Bits
      • Power of Four
      • Sum of Two Integers
      • Find the Difference
      • UTF-8 Validation
      • Integer Replacement
      • Binary Watch
      • Convert a Number to Hexadecimal
      • Maximum XOR of Two Numbers in an Array
      • Hamming Distance
      • Total Hamming Distance
      • Number Complement
      • Binary Number with Alternating Bits
      • Pyramid Transition Matrix
      • Prime Number of Set Bits in Binary Representation
      • Letter Case Permutation
      • Majority Element
      • Bitwise AND of Numbers Range
      • Single Number III
      • Missing Number
      • Maximum Product of Word Lengths
      • Reverse Bits
      • Number of 1 Bits
      • Bitwise ORs of Subarrays
    • Tree
      • Binary Tree Inorder Traversal
      • Unique Binary Search Trees II
      • Unique Binary Search Trees
      • Validate Binary Search Tree
      • Recover Binary Search Tree
      • Same Tree
      • Symmetric Tree
      • Binary Tree Level Order Traversal
      • Binary Tree Zigzag Level Order Traversal
      • Maximum Depth of Binary Tree
      • Construct Binary Tree from Preorder and Inorder Traversal
      • Construct Binary Tree from Inorder and Postorder Traversal
      • Binary Tree Level Order Traversal II
      • Convert Sorted Array to Binary Search Tree
      • Balanced Binary Tree
      • Minimum Depth of Binary Tree
      • Path Sum
      • Path Sum II
      • Flatten Binary Tree to Linked List
      • Populating Next Right Pointers in Each Node
      • Populating Next Right Pointers in Each Node II
      • Binary Tree Maximum Path Sum
      • Sum Root to Leaf Numbers
      • Binary Tree Preorder Traversal
      • Binary Tree Postorder Traversal
      • Binary Search Tree Iterator
      • House Robber III
      • Sum of Left Leaves
      • Path Sum III
      • Subtree of Another Tree
      • Serialize and Deserialize BST
      • Delete Node in a BST
      • Find Mode in Binary Search Tree
      • Find Largest Value in Each Tree Row
      • Most Frequent Subtree Sum
      • Find Bottom Left Tree Value
      • Diameter of Binary Tree
      • Convert BST to Greater Tree
      • Construct String from Binary Tree
      • Add One Row to Tree
      • Two Sum IV - Input is a BST
      • Binary Tree Tilt
      • Merge Two Binary Trees
      • Average of Levels in Binary Tree
      • Print Binary Tree
      • Maximum Binary Tree
      • Maximum Width of Binary Tree
      • Trim a Binary Search Tree
      • Second Minimum Node In a Binary Tree
      • Redundant Connection
      • Redundant Connection II
      • Longest Univalue Path
      • Binary Tree Pruning
      • Binary Tree Right Side View
      • Count Complete Tree Nodes
      • Invert Binary Tree
      • Lowest Common Ancestor of a Binary Search Tree
      • Binary Tree Paths
      • Serialize and Deserialize Binary Tree
      • Kth Smallest Element in a BST
      • Find Duplicate Subtrees
      • Lowest Common Ancestor of a Binary Tree
      • All Nodes Distance K in Binary Tree
      • Smallest Subtree with all the Deepest Nodes
      • N-ary Tree Preorder Traversal
      • N-ary Tree Postorder Traversal
      • Maximum Depth of N-ary Tree
      • Insert into a Binary Search Tree
      • Search in a Binary Search Tree
      • Leaf-Similar Trees
      • Construct Binary Tree from Preorder and Postorder Traversal
      • All Possible Full Binary Trees
      • Increasing Order Search Tree
      • N-ary Tree Level Order Traversal
    • Depth-first Search
      • Validate Binary Search Tree
      • Recover Binary Search Tree
      • Same Tree
      • Symmetric Tree
      • Maximum Depth of Binary Tree
      • Construct Binary Tree from Preorder and Inorder Traversal
      • Construct Binary Tree from Inorder and Postorder Traversal
      • Convert Sorted Array to Binary Search Tree
      • Convert Sorted List to Binary Search Tree
      • Balanced Binary Tree
      • Minimum Depth of Binary Tree
      • Path Sum
      • Path Sum II
      • Flatten Binary Tree to Linked List
      • Populating Next Right Pointers in Each Node
      • Populating Next Right Pointers in Each Node II
      • Binary Tree Maximum Path Sum
      • Sum Root to Leaf Numbers
      • Surrounded Regions
      • Clone Graph
      • House Robber III
      • Decode String
      • Pacific Atlantic Water Flow
      • Freedom Trail
      • Concatenated Words
      • Matchsticks to Square
      • Target Sum
      • Increasing Subsequences
      • Zuma Game
      • Find Largest Value in Each Tree Row
      • Remove Boxes
      • Find Bottom Left Tree Value
      • Shopping Offers
      • 01 Matrix
      • Minesweeper
      • Friend Circles
      • Strange Printer
      • Out of Boundary Paths
      • Employee Importance
      • 24 Game
      • Redundant Connection II
      • Max Area of Island
      • Accounts Merge
      • Flood Fill
      • Network Delay Time
      • Contain Virus
      • Cracking the Safe
      • Pyramid Transition Matrix
      • Swim in Rising Water
      • Is Graph Bipartite?
      • Find Eventual Safe States
      • Making A Large Island
      • Keys and Rooms
      • Remove Invalid Parentheses
      • Course Schedule
      • Number of Islands
      • Binary Tree Right Side View
      • Course Schedule II
      • Binary Tree Paths
      • Longest Increasing Path in a Matrix
      • Loud and Rich
      • All Nodes Distance K in Binary Tree
      • Maximum Depth of N-ary Tree
      • Flatten a Multilevel Doubly Linked List
      • Leaf-Similar Trees
      • Reconstruct Itinerary
      • Increasing Order Search Tree
      • Possible Bipartition
      • Shortest Bridge
    • Breadth-first Search
      • Symmetric Tree
      • Binary Tree Level Order Traversal
      • Binary Tree Zigzag Level Order Traversal
      • Binary Tree Level Order Traversal II
      • Minimum Depth of Binary Tree
      • Word Ladder II
      • Word Ladder
      • Surrounded Regions
      • Clone Graph
      • Trapping Rain Water II
      • Pacific Atlantic Water Flow
      • Find Largest Value in Each Tree Row
      • Find Bottom Left Tree Value
      • 01 Matrix
      • Minesweeper
      • Employee Importance
      • Cut Off Trees for Golf Event
      • Network Delay Time
      • Open the Lock
      • Sliding Puzzle
      • Is Graph Bipartite?
      • Cheapest Flights Within K Stops
      • Bus Routes
      • Remove Invalid Parentheses
      • Course Schedule
      • Number of Islands
      • Binary Tree Right Side View
      • Course Schedule II
      • Shortest Path Visiting All Nodes
      • Perfect Squares
      • Minimum Height Trees
      • K-Similar Strings
      • All Nodes Distance K in Binary Tree
      • Shortest Path to Get All Keys
      • Maximum Depth of N-ary Tree
      • Cat and Mouse
      • N-ary Tree Level Order Traversal
      • Shortest Bridge
    • Union Find
      • Longest Consecutive Sequence
      • Surrounded Regions
      • Friend Circles
      • Redundant Connection
      • Redundant Connection II
      • Accounts Merge
      • Couples Holding Hands
      • Swim in Rising Water
      • Bricks Falling When Hit
      • Number of Islands
    • Graph
      • Clone Graph
      • Evaluate Division
      • Redundant Connection
      • Redundant Connection II
      • Network Delay Time
      • Couples Holding Hands
      • Is Graph Bipartite?
      • Find Eventual Safe States
      • Keys and Rooms
      • Course Schedule
      • Course Schedule II
      • Minimum Height Trees
      • K-Similar Strings
      • Reconstruct Itinerary
    • Design
      • LRU Cache
      • Min Stack
      • Binary Search Tree Iterator
      • Flatten Nested List Iterator
      • Design Twitter
      • Insert Delete GetRandom O(1)
      • Insert Delete GetRandom O(1) - Duplicates allowed
      • All O`one Data Structure
      • LFU Cache
      • Implement Trie (Prefix Tree)
      • Add and Search Word - Data structure design
      • Implement Stack using Queues
      • Implement Queue using Stacks
      • Serialize and Deserialize Binary Tree
      • Peeking Iterator
      • Design Linked List
      • Design Circular Queue
      • Design HashSet
      • Design HashMap
      • Find Median from Data Stream
      • Design Circular Deque
    • Topological Sort
      • Course Schedule
      • Course Schedule II
      • Longest Increasing Path in a Matrix
    • Trie
      • Palindrome Pairs
      • Maximum XOR of Two Numbers in an Array
      • Concatenated Words
      • Replace Words
      • Implement Magic Dictionary
      • Map Sum Pairs
      • Top K Frequent Words
      • Longest Word in Dictionary
      • Prefix and Suffix Search
      • Implement Trie (Prefix Tree)
      • Add and Search Word - Data structure design
      • Word Search II
    • Binary Indexed Tree
      • Reverse Pairs
      • The Skyline Problem
      • Range Sum Query - Mutable
      • Count of Smaller Numbers After Self
    • Segment Tree
      • Reverse Pairs
      • Falling Squares
      • Range Module
      • My Calendar III
      • The Skyline Problem
      • Range Sum Query - Mutable
      • Count of Smaller Numbers After Self
      • Rectangle Area II
    • Binary Search Tree
      • Data Stream as Disjoint Intervals
      • Reverse Pairs
      • Minimum Absolute Difference in BST
      • Falling Squares
      • Range Module
      • My Calendar II
      • My Calendar III
      • Minimum Distance Between BST Nodes
      • Contains Duplicate III
      • Count of Smaller Numbers After Self
      • Count of Range Sum
    • Recursion
      • Longest Univalue Path
      • Partition to K Equal Sum Subsets
      • Number of Atoms
      • Special Binary String
      • K-th Symbol in Grammar
      • Valid Tic-Tac-Toe State
      • All Possible Full Binary Trees
    • Brainteaser
      • Swap Adjacent in LR String
      • Nim Game
      • Bulb Switcher
    • Memoization
      • Longest Increasing Path in a Matrix
    • Queue
      • Max Sum of Rectangle No Larger Than K
      • Task Scheduler
      • Shortest Subarray with Sum at Least K
      • Design Circular Queue
      • Number of Recent Calls
      • Design Circular Deque
    • Minimax
      • Guess Number Higher or Lower II
      • Can I Win
      • Predict the Winner
      • Guess the Word
      • Cat and Mouse
    • Reservoir Sampling
      • Linked List Random Node
      • Random Pick Index
    • Geometry
      • Erect the Fence
      • Surface Area of 3D Shapes
    • Map
      • Hand of Straights
      • Exam Room
    • Array
      • 3Sum
      • 3Sum Closest
      • 4Sum
      • Remove Duplicates from Sorted Array
      • Remove Element
      • Next Permutation
      • Search in Rotated Sorted Array
      • Search Insert Position
      • Combination Sum
      • Combination Sum II
      • First Missing Positive
      • Trapping Rain Water
      • Jump Game II
      • Rotate Image
      • Maximum Subarray
      • Spiral Matrix
      • Jump Game
      • Merge Intervals
      • Insert Interval
      • Spiral Matrix II
      • Unique Paths
      • Unique Paths II
      • Minimum Path Sum
      • Plus One
      • Set Matrix Zeroes
      • Search a 2D Matrix
      • Sort Colors
      • Subsets
      • Word Search
      • Remove Duplicates from Sorted Array II
      • Search in Rotated Sorted Array II
      • Largest Rectangle in Histogram
      • Maximal Rectangle
      • Merge Sorted Array
      • Subsets II
      • Construct Binary Tree from Preorder and Inorder Traversal
      • Construct Binary Tree from Inorder and Postorder Traversal
      • Pascal's Triangle
      • Pascal's Triangle II
      • Triangle
      • Best Time to Buy and Sell Stock
      • Best Time to Buy and Sell Stock II
      • Best Time to Buy and Sell Stock III
      • Word Ladder II
      • Longest Consecutive Sequence
      • Insert Delete GetRandom O(1)
      • Insert Delete GetRandom O(1) - Duplicates allowed
      • Third Maximum Number
      • Find All Duplicates in an Array
      • Find All Numbers Disappeared in an Array
      • Maximum Product of Three Numbers
      • Max Consecutive Ones
      • Teemo Attacking
      • Maximum Average Subarray I
      • K-diff Pairs in an Array
      • Array Partition I
      • Reshape the Matrix
      • Subarray Sum Equals K
      • Array Nesting
      • Task Scheduler
      • Can Place Flowers
      • Shortest Unsorted Continuous Subarray
      • Valid Triangle Number
      • Non-decreasing Array
      • Image Smoother
      • Maximum Swap
      • Beautiful Arrangement II
      • Longest Continuous Increasing Subsequence
      • Maximum Sum of 3 Non-Overlapping Subarrays
      • Max Area of Island
      • Degree of an Array
      • Best Time to Buy and Sell Stock with Transaction Fee
      • Subarray Product Less Than K
      • Range Module
      • 1-bit and 2-bit Characters
      • Find K-th Smallest Pair Distance
      • Maximum Length of Repeated Subarray
      • Find Pivot Index
      • My Calendar I
      • My Calendar II
      • Min Cost Climbing Stairs
      • Largest Number At Least Twice of Others
      • Toeplitz Matrix
      • Max Chunks To Make Sorted II
      • Max Chunks To Make Sorted
      • Global and Local Inversions
      • Transform to Chessboard
      • Number of Matching Subsequences
      • Number of Subarrays with Bounded Maximum
      • Friends Of Appropriate Ages
      • Positions of Large Groups
      • Maximum Product Subarray
      • Find Minimum in Rotated Sorted Array
      • Find Minimum in Rotated Sorted Array II
      • Find Peak Element
      • Two Sum II - Input array is sorted
      • Majority Element
      • Image Overlap
      • Contains Duplicate
      • Magic Squares In Grid
      • Find the Duplicate Number
      • Minimum Size Subarray Sum
      • Combination Sum III
      • Contains Duplicate II
      • Summary Ranges
      • Majority Element II
      • Product of Array Except Self
      • Missing Number
      • Move Zeroes
      • Game of Life
      • Maximize Distance to Closest Person
      • Find First and Last Position of Element in Sorted Array
      • Transpose Matrix
      • Rotate Array
      • Container With Most Water
      • Two Sum
      • Median of Two Sorted Arrays
      • Length of Longest Fibonacci Subsequence
      • Fair Candy Swap
      • Monotonic Array
      • RLE Iterator
      • Sum of Subarray Minimums
      • Sort Array By Parity
      • X of a Kind in a Deck of Cards
      • Partition Array into Disjoint Intervals
      • Sum of Subsequence Widths
    • Hash Table
      • 4Sum
      • Substring with Concatenation of All Words
      • Valid Sudoku
      • Sudoku Solver
      • Group Anagrams
      • Minimum Window Substring
      • Maximal Rectangle
      • Binary Tree Inorder Traversal
      • Single Number
      • Copy List with Random Pointer
      • Max Points on a Line
      • Repeated DNA Sequences
      • Palindrome Pairs
      • Top K Frequent Elements
      • Design Twitter
      • Insert Delete GetRandom O(1)
      • Insert Delete GetRandom O(1) - Duplicates allowed
      • First Unique Character in a String
      • Find the Difference
      • Longest Palindrome
      • Keyboard Row
      • Encode and Decode TinyURL
      • Find All Anagrams in a String
      • Number of Boomerangs
      • Sort Characters By Frequency
      • 4Sum II
      • Island Perimeter
      • Most Frequent Subtree Sum
      • Contiguous Array
      • Brick Wall
      • Subarray Sum Equals K
      • Distribute Candies
      • Longest Harmonious Subsequence
      • Find Duplicate File in System
      • Minimum Index Sum of Two Lists
      • Smallest Range
      • Set Mismatch
      • Replace Words
      • Employee Importance
      • Implement Magic Dictionary
      • Top K Frequent Words
      • Maximum Length of Repeated Subarray
      • Longest Word in Dictionary
      • Number of Atoms
      • Daily Temperatures
      • Shortest Completing Word
      • Basic Calculator IV
      • Jewels and Stones
      • Rabbits in Forest
      • Subdomain Visit Count
      • Fraction to Recurring Decimal
      • Contains Duplicate
      • Isomorphic Strings
      • Count Primes
      • Happy Number
      • Contains Duplicate II
      • Valid Anagram
      • H-Index
      • Word Pattern
      • Bulls and Cows
      • Design HashSet
      • Design HashMap
      • Random Pick with Blacklist
      • Two Sum
      • Longest Substring Without Repeating Characters
      • Intersection of Two Arrays
      • Uncommon Words from Two Sentences
      • Intersection of Two Arrays II
      • Maximum Frequency Stack
    • Linked List
      • Remove Nth Node From End of List
      • Merge Two Sorted Lists
      • Merge k Sorted Lists
      • Swap Nodes in Pairs
      • Reverse Nodes in k-Group
      • Rotate List
      • Remove Duplicates from Sorted List II
      • Remove Duplicates from Sorted List
      • Partition List
      • Reverse Linked List II
      • Convert Sorted List to Binary Search Tree
      • Copy List with Random Pointer
      • Linked List Cycle
      • Linked List Cycle II
      • Reorder List
      • Insertion Sort List
      • Sort List
      • Intersection of Two Linked Lists
      • Add Two Numbers II
      • Split Linked List in Parts
      • Linked List Components
      • Odd Even Linked List
      • Reverse Linked List
      • Remove Linked List Elements
      • Palindrome Linked List
      • Delete Node in a Linked List
      • Flatten a Multilevel Doubly Linked List
      • Design Linked List
      • Add Two Numbers
      • Middle of the Linked List
    • Math
      • Reverse Integer
      • Integer to Roman
      • Roman to Integer
      • Divide Two Integers
      • Multiply Strings
      • Pow(x, n)
      • Permutation Sequence
      • Valid Number
      • Plus One
      • Add Binary
      • Sqrt(x)
      • Max Points on a Line
      • Power of Two
      • Integer to English Words
      • Self Crossing
      • Count Numbers with Unique Digits
      • Super Pow
      • Rotate Function
      • Integer Replacement
      • Nth Digit
      • Encode and Decode TinyURL
      • Arithmetic Slices
      • Arranging Coins
      • Add Strings
      • Reconstruct Original Digits from English
      • Minimum Moves to Equal Array Elements
      • Minimum Moves to Equal Array Elements II
      • Maximum Product of Three Numbers
      • Continuous Subarray Sum
      • Smallest Good Base
      • Perfect Number
      • Super Washing Machines
      • Complex Number Multiplication
      • Optimal Division
      • Valid Square
      • Fraction Addition and Subtraction
      • Range Addition II
      • Sum of Square Numbers
      • Solve the Equation
      • Set Mismatch
      • Maximum Swap
      • Bulb Switcher II
      • Self Dividing Numbers
      • Cracking the Safe
      • Reach a Number
      • Global and Local Inversions
      • Reaching Points
      • Transform to Chessboard
      • Rabbits in Forest
      • Escape The Ghosts
      • Valid Tic-Tac-Toe State
      • Chalkboard XOR Game
      • Largest Triangle Area
      • String to Integer (atoi)
      • Consecutive Numbers Sum
      • Fraction to Recurring Decimal
      • Excel Sheet Column Title
      • Excel Sheet Column Number
      • Factorial Trailing Zeroes
      • Count Primes
      • Happy Number
      • Rectangle Area
      • Basic Calculator
      • Number of Digit One
      • Add Digits
      • Ugly Number
      • Ugly Number II
      • Missing Number
      • Perfect Squares
      • Super Ugly Number
      • Bulb Switcher
      • Power of Three
      • Mirror Reflection
      • Prime Palindrome
      • Add Two Numbers
      • Stone Game
      • Nth Magical Number
      • Generate Random Point in a Circle
      • Integer Break
      • Projection Area of 3D Shapes
      • Spiral Matrix III
      • Super Egg Drop
      • Surface Area of 3D Shapes
      • Palindrome Number
      • Water and Jug Problem
      • Orderly Queue
      • Numbers At Most N Given Digit Set
      • Super Palindromes
      • Valid Perfect Square
      • Largest Divisible Subset
      • X of a Kind in a Deck of Cards
      • Sum of Subsequence Widths
    • Two Pointers
      • 3Sum
      • 3Sum Closest
      • 4Sum
      • Remove Nth Node From End of List
      • Remove Duplicates from Sorted Array
      • Remove Element
      • Implement strStr()
      • Substring with Concatenation of All Words
      • Trapping Rain Water
      • Rotate List
      • Sort Colors
      • Minimum Window Substring
      • Remove Duplicates from Sorted Array II
      • Partition List
      • Merge Sorted Array
      • Valid Palindrome
      • Linked List Cycle
      • Linked List Cycle II
      • Reverse Vowels of a String
      • Longest Word in Dictionary through Deleting
      • K-diff Pairs in an Array
      • Permutation in String
      • Smallest Range
      • Subarray Product Less Than K
      • Partition Labels
      • Most Profit Assigning Work
      • Unique Letter String
      • Two Sum II - Input array is sorted
      • Find the Duplicate Number
      • Minimum Size Subarray Sum
      • Palindrome Linked List
      • Backspace String Compare
      • Longest Mountain in Array
      • Move Zeroes
      • Container With Most Water
      • Longest Substring Without Repeating Characters
      • Reverse String
      • Intersection of Two Arrays
      • Boats to Save People
      • Intersection of Two Arrays II
      • Fruit Into Baskets
    • String
      • ZigZag Conversion
      • Regular Expression Matching
      • Integer to Roman
      • Roman to Integer
      • Longest Common Prefix
      • Letter Combinations of a Phone Number
      • Valid Parentheses
      • Generate Parentheses
      • Implement strStr()
      • Substring with Concatenation of All Words
      • Longest Valid Parentheses
      • Multiply Strings
      • Wildcard Matching
      • Group Anagrams
      • Length of Last Word
      • Valid Number
      • Add Binary
      • Text Justification
      • Simplify Path
      • Edit Distance
      • Minimum Window Substring
      • Scramble String
      • Decode Ways
      • Restore IP Addresses
      • Interleaving String
      • Distinct Subsequences
      • Valid Palindrome
      • Word Ladder II
      • Reverse Words in a String
      • Compare Version Numbers
      • Integer to English Words
      • Palindrome Pairs
      • Reverse Vowels of a String
      • Ransom Note
      • Mini Parser
      • First Unique Character in a String
      • String Compression
      • Number of Segments in a String
      • Validate IP Address
      • Detect Capital
      • Longest Uncommon Subsequence I
      • Longest Uncommon Subsequence II
      • Complex Number Multiplication
      • Minimum Time Difference
      • Reverse String II
      • Construct String from Binary Tree
      • Next Greater Element III
      • Student Attendance Record I
      • Optimal Division
      • Delete Operation for Two Strings
      • Reverse Words in a String III
      • Find the Closest Palindrome
      • Tag Validator
      • Find Duplicate File in System
      • Palindromic Substrings
      • Smallest Range
      • Valid Parenthesis String
      • Valid Palindrome II
      • Count Binary Substrings
      • Remove Comments
      • Count Different Palindromic Subsequences
      • Parse Lisp Expression
      • Special Binary String
      • Basic Calculator IV
      • Reorganize String
      • Rotated Digits
      • Custom Sort String
      • Expressive Words
      • Ambiguous Coordinates
      • String to Integer (atoi)
      • Goat Latin
      • Masking Personal Information
      • Split Array into Fibonacci Sequence
      • Shortest Palindrome
      • Basic Calculator II
      • Shifting Letters
      • Score of Parentheses
      • To Lower Case
      • Longest Substring Without Repeating Characters
      • Longest Palindromic Substring
      • Repeated String Match
      • Repeated Substring Pattern
      • Reverse String
      • Find and Replace Pattern
      • Groups of Special-Equivalent Strings
      • Buddy Strings
      • Orderly Queue
      • Robot Return to Origin
      • Count and Say
      • Word Subsets
      • Most Common Word
      • Stamping The Sequence
    • Binary Search
      • Divide Two Integers
      • Search in Rotated Sorted Array
      • Search Insert Position
      • Pow(x, n)
      • Sqrt(x)
      • Search a 2D Matrix
      • Search in Rotated Sorted Array II
      • Russian Doll Envelopes
      • Max Sum of Rectangle No Larger Than K
      • Guess Number Higher or Lower
      • Kth Smallest Element in a Sorted Matrix
      • Is Subsequence
      • Split Array Largest Sum
      • Arranging Coins
      • Find Right Interval
      • 4Sum II
      • Heaters
      • Smallest Good Base
      • Find K Closest Elements
      • Kth Smallest Number in Multiplication Table
      • Find K-th Smallest Pair Distance
      • Maximum Length of Repeated Subarray
      • Find Smallest Letter Greater Than Target
      • Swim in Rising Water
      • K-th Smallest Prime Fraction
      • Preimage Size of Factorial Zeroes Function
      • Find Minimum in Rotated Sorted Array
      • Find Minimum in Rotated Sorted Array II
      • Find Peak Element
      • Two Sum II - Input array is sorted
      • Dungeon Game
      • Find the Duplicate Number
      • Minimum Size Subarray Sum
      • Count Complete Tree Nodes
      • H-Index II
      • First Bad Version
      • Longest Increasing Subsequence
      • Kth Smallest Element in a BST
      • Search a 2D Matrix II
      • Peak Index in a Mountain Array
      • Shortest Subarray with Sum at Least K
      • Find First and Last Position of Element in Sorted Array
      • Binary Search
      • Random Pick with Blacklist
      • Median of Two Sorted Arrays
      • Nth Magical Number
      • Random Pick with Weight
      • Random Point in Non-overlapping Rectangles
      • Intersection of Two Arrays
      • Super Egg Drop
      • Intersection of Two Arrays II
      • Koko Eating Bananas
      • Valid Perfect Square
    • Divide and Conquer
      • Merge k Sorted Lists
      • Maximum Subarray
      • Freedom Trail
      • Reverse Pairs
      • Majority Element
      • Kth Largest Element in an Array
      • The Skyline Problem
      • Different Ways to Add Parentheses
      • Expression Add Operators
      • Burst Balloons
      • Count of Smaller Numbers After Self
      • Count of Range Sum
      • Search a 2D Matrix II
      • Median of Two Sorted Arrays
      • Valid Permutations for DI Sequence
    • Dynamic Programming
      • Regular Expression Matching
      • Longest Valid Parentheses
      • Wildcard Matching
      • Maximum Subarray
      • Unique Paths
      • Unique Paths II
      • Minimum Path Sum
      • Climbing Stairs
      • Edit Distance
      • Maximal Rectangle
      • Scramble String
      • Decode Ways
      • Unique Binary Search Trees II
      • Unique Binary Search Trees
      • Interleaving String
      • Distinct Subsequences
      • Triangle
      • Best Time to Buy and Sell Stock
      • Best Time to Buy and Sell Stock III
      • Palindrome Partitioning II
      • Word Break
      • Word Break II
      • Counting Bits
      • Russian Doll Envelopes
      • Count Numbers with Unique Digits
      • Max Sum of Rectangle No Larger Than K
      • Guess Number Higher or Lower II
      • Combination Sum IV
      • Is Subsequence
      • Frog Jump
      • Split Array Largest Sum
      • Arithmetic Slices
      • Partition Equal Subset Sum
      • Arithmetic Slices II - Subsequence
      • Can I Win
      • Freedom Trail
      • Count The Repetitions
      • Unique Substrings in Wraparound String
      • Ones and Zeroes
      • Concatenated Words
      • Target Sum
      • Continuous Subarray Sum
      • Predict the Winner
      • Remove Boxes
      • Shopping Offers
      • Longest Palindromic Subsequence
      • Super Washing Machines
      • Non-negative Integers without Consecutive Ones
      • Student Attendance Record II
      • Strange Printer
      • Out of Boundary Paths
      • K Inverse Pairs Array
      • Palindromic Substrings
      • Decode Ways II
      • Maximum Length of Pair Chain
      • 2 Keys Keyboard
      • Number of Longest Increasing Subsequence
      • Knight Probability in Chessboard
      • Maximum Sum of 3 Non-Overlapping Subarrays
      • Stickers to Spell Word
      • Partition to K Equal Sum Subsets
      • Best Time to Buy and Sell Stock with Transaction Fee
      • Minimum ASCII Delete Sum for Two Strings
      • Maximum Length of Repeated Subarray
      • Count Different Palindromic Subsequences
      • Delete and Earn
      • Cherry Pickup
      • Min Cost Climbing Stairs
      • Largest Plus Sign
      • Cheapest Flights Within K Stops
      • Domino and Tromino Tiling
      • Minimum Swaps To Make Sequences Increasing
      • Soup Servings
      • Largest Sum of Averages
      • Race Car
      • Maximum Product Subarray
      • Dungeon Game
      • Coin Change
      • House Robber
      • House Robber II
      • Maximal Square
      • Ugly Number II
      • Shortest Path Visiting All Nodes
      • Perfect Squares
      • Longest Increasing Subsequence
      • Range Sum Query - Immutable
      • Range Sum Query 2D - Immutable
      • Best Time to Buy and Sell Stock with Cooldown
      • Burst Balloons
      • Create Maximum Number
      • Best Time to Buy and Sell Stock IV
      • Longest Palindromic Substring
      • Length of Longest Fibonacci Subsequence
      • Stone Game
      • Profitable Schemes
      • Integer Break
      • Super Egg Drop
      • Bitwise ORs of Subarrays
      • Numbers At Most N Given Digit Set
      • Valid Permutations for DI Sequence
      • Largest Divisible Subset
      • Wiggle Subsequence
      • Knight Dialer
    • Backtracking
      • Regular Expression Matching
      • Letter Combinations of a Phone Number
      • Generate Parentheses
      • Sudoku Solver
      • Combination Sum
      • Combination Sum II
      • Wildcard Matching
      • Permutations
      • Permutations II
      • N-Queens
      • N-Queens II
      • Permutation Sequence
      • Combinations
      • Subsets
      • Word Search
      • Subsets II
      • Restore IP Addresses
      • Word Ladder II
      • Palindrome Partitioning
      • Word Break II
      • Count Numbers with Unique Digits
      • Binary Watch
      • Beautiful Arrangement
      • Stickers to Spell Word
      • Letter Case Permutation
      • Additive Number
      • Add and Search Word - Data structure design
      • Word Search II
      • Combination Sum III
      • Gray Code
    • Random
      • Random Pick with Blacklist
      • Implement Rand10() Using Rand7()
      • Generate Random Point in a Circle
      • Random Pick with Weight
      • Random Flip Matrix
      • Random Point in Non-overlapping Rectangles
    • Rejection Sampling
      • Implement Rand10() Using Rand7()
      • Generate Random Point in a Circle
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题目列表

题目 难度
Regular Expression Matching 困难
Letter Combinations of a Phone Number 中等
Generate Parentheses 中等
Sudoku Solver 困难
Combination Sum 中等
Combination Sum II 中等
Wildcard Matching 困难
Permutations 中等
Permutations II 中等
N-Queens 困难
N-Queens II 困难
Permutation Sequence 中等
Combinations 中等
Subsets 中等
Word Search 中等
Subsets II 中等
Restore IP Addresses 中等
Word Ladder II 困难
Palindrome Partitioning 中等
Word Break II 困难
Count Numbers with Unique Digits 中等
Binary Watch 简单
Beautiful Arrangement 中等
Stickers to Spell Word 困难
Letter Case Permutation 简单
Additive Number 中等
Add and Search Word - Data structure design 中等
Word Search II 困难
Combination Sum III 中等
Gray Code 中等

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