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Introductory Problems (24)
Weird Algorithm
Missing Number
Repetitions
Increasing Array
Permutations
Number Spiral
Two Knights
Two Sets
Bit Strings
Trailing Zeros
Coin Piles
Palindrome Reorder
Gray Code
Tower of Hanoi
Creating Strings
Apple Division
Chessboard and Queens
Raab Game I
Mex Grid Construction
Knight Moves Grid
Grid Coloring I
Digit Queries
String Reorder
Grid Path Description
Sorting and Searching (35)
Distinct Numbers
Apartments
Ferris Wheel
Concert Tickets
Restaurant Customers
Movie Festival
Sum of Two Values
Maximum Subarray Sum
Stick Lengths
Missing Coin Sum
Collecting Numbers
Collecting Numbers II
Playlist
Towers
Traffic Lights
Distinct Values Subarrays
Distinct Values Subsequences
Josephus Problem I
Josephus Problem II
Nested Ranges Check
Nested Ranges Count
Room Allocation
Factory Machines
Tasks and Deadlines
Reading Books
Sum of Three Values
Sum of Four Values
Nearest Smaller Values
Subarray Sums I
Subarray Sums II
Subarray Divisibility
Distinct Values Subarrays II
Array Division
Movie Festival II
Maximum Subarray Sum II
Dynamic Programming (23)
Dice Combinations
已用過
Minimizing Coins
已用過
Coin Combinations I
已用過
Coin Combinations II
已用過
Removing Digits
已用過
Grid Paths I
已用過
Book Shop
已用過
Array Description
已用過
Counting Towers
已用過
Edit Distance
已用過
Longest Common Subsequence
已用過
Rectangle Cutting
已用過
Minimal Grid Path
Money Sums
Removal Game
Two Sets II
Mountain Range
Increasing Subsequence
Projects
Elevator Rides
Counting Tilings
Counting Numbers
Increasing Subsequence II
Graph Algorithms (36)
Counting Rooms
Labyrinth
Building Roads
Message Route
Building Teams
Round Trip
Monsters
Shortest Routes I
Shortest Routes II
High Score
Flight Discount
Cycle Finding
Flight Routes
Round Trip II
Course Schedule
Longest Flight Route
Game Routes
Investigation
Planets Queries I
Planets Queries II
Planets Cycles
Road Reparation
Road Construction
Flight Routes Check
Planets and Kingdoms
Giant Pizza
Coin Collector
Mail Delivery
De Bruijn Sequence
Teleporters Path
Hamiltonian Flights
Knight's Tour
Download Speed
Police Chase
School Dance
Distinct Routes
Range Queries (25)
Static Range Sum Queries
Static Range Minimum Queries
Dynamic Range Sum Queries
Dynamic Range Minimum Queries
Range Xor Queries
Range Update Queries
Forest Queries
Hotel Queries
List Removals
Salary Queries
Prefix Sum Queries
Pizzeria Queries
Visible Buildings Queries
Range Interval Queries
Subarray Sum Queries
Subarray Sum Queries II
Distinct Values Queries
Distinct Values Queries II
Increasing Array Queries
Movie Festival Queries
Forest Queries II
Range Updates and Sums
Polynomial Queries
Range Queries and Copies
Missing Coin Sum Queries
Tree Algorithms (16)
Subordinates
Tree Matching
Tree Diameter
Tree Distances I
Tree Distances II
Company Queries I
Company Queries II
Distance Queries
Counting Paths
Subtree Queries
Path Queries
Path Queries II
Distinct Colors
Finding a Centroid
Fixed-Length Paths I
Fixed-Length Paths II
Mathematics (37)
Josephus Queries
Exponentiation
Exponentiation II
Counting Divisors
Common Divisors
Sum of Divisors
Divisor Analysis
Prime Multiples
Counting Coprime Pairs
Next Prime
Binomial Coefficients
Creating Strings II
Distributing Apples
Christmas Party
Permutation Order
Permutation Rounds
Bracket Sequences I
Bracket Sequences II
Counting Necklaces
Counting Grids
Fibonacci Numbers
Throwing Dice
Graph Paths I
Graph Paths II
System of Linear Equations
Sum of Four Squares
Triangle Number Sums
Dice Probability
Moving Robots
Candy Lottery
Inversion Probability
Stick Game
Nim Game I
Nim Game II
Stair Game
Grundy's Game
Another Game
String Algorithms (21)
Word Combinations
String Matching
Finding Borders
Finding Periods
Minimal Rotation
Longest Palindrome
All Palindromes
Required Substring
Palindrome Queries
Finding Patterns
Counting Patterns
Pattern Positions
Distinct Substrings
Distinct Subsequences
Repeating Substring
String Functions
Inverse Suffix Array
String Transform
Substring Order I
Substring Order II
Substring Distribution
Geometry (16)
Point Location Test
Line Segment Intersection
Polygon Area
Point in Polygon
Polygon Lattice Points
Minimum Euclidean Distance
Convex Hull
Maximum Manhattan Distances
All Manhattan Distances
Intersection Points
Line Segments Trace I
Line Segments Trace II
Lines and Queries I
Lines and Queries II
Area of Rectangles
Robot Path
Advanced Techniques (25)
Meet in the Middle
Hamming Distance
Corner Subgrid Check
Corner Subgrid Count
Reachable Nodes
Reachability Queries
Cut and Paste
Substring Reversals
Reversals and Sums
Necessary Roads
Necessary Cities
Eulerian Subgraphs
Monster Game I
Monster Game II
Subarray Squares
Houses and Schools
Knuth Division
Apples and Bananas
One Bit Positions
Signal Processing
New Roads Queries
Dynamic Connectivity
Parcel Delivery
Task Assignment
Distinct Routes II
Sliding Window Problems (11)
Sliding Window Sum
Sliding Window Minimum
Sliding Window Xor
Sliding Window Or
Sliding Window Distinct Values
Sliding Window Mode
Sliding Window Mex
Sliding Window Median
Sliding Window Cost
Sliding Window Inversions
Sliding Window Advertisement
Interactive Problems (6)
Hidden Integer
Hidden Permutation
K-th Highest Score
Permuted Binary Strings
Colored Chairs
Inversion Sorting
Bitwise Operations (11)
Counting Bits
Maximum Xor Subarray
Maximum Xor Subset
Number of Subset Xors
K Subset Xors
All Subarray Xors
Xor Pyramid Peak
Xor Pyramid Diagonal
Xor Pyramid Row
SOS Bit Problem
And Subset Count
Construction Problems (8)
Inverse Inversions
Monotone Subsequences
Third Permutation
Permutation Prime Sums
Chess Tournament
Distinct Sums Grid
Filling Trominos
Grid Path Construction
Advanced Graph Problems (28)
Nearest Shops
Prüfer Code
Tree Traversals
Course Schedule II
Acyclic Graph Edges
Strongly Connected Edges
Even Outdegree Edges
Graph Girth
Fixed Length Walk Queries
Transfer Speeds Sum
MST Edge Check
MST Edge Set Check
MST Edge Cost
Network Breakdown
Tree Coin Collecting I
Tree Coin Collecting II
Tree Isomorphism I
Tree Isomorphism II
Flight Route Requests
Critical Cities
Visiting Cities
Graph Coloring
Bus Companies
Split into Two Paths
Network Renovation
Forbidden Cities
Creating Offices
New Flight Routes
Counting Problems (18)
Filled Subgrid Count I
Filled Subgrid Count II
All Letter Subgrid Count I
All Letter Subgrid Count II
Border Subgrid Count I
Border Subgrid Count II
Raab Game II
Empty String
Permutation Inversions
Counting Bishops
Counting Sequences
Grid Paths II
Counting Permutations
Grid Completion
Counting Reorders
Tournament Graph Distribution
Collecting Numbers Distribution
Functional Graph Distribution
Additional Problems I (30)
Shortest Subsequence
Distinct Values Sum
Distinct Values Splits
Swap Game
Beautiful Permutation II
Multiplication Table
Bubble Sort Rounds I
Bubble Sort Rounds II
Nearest Campsites I
Nearest Campsites II
Advertisement
Special Substrings
Counting LCM Arrays
Square Subsets
Subarray Sum Constraints
Water Containers Moves
Water Containers Queries
Stack Weights
Maximum Average Subarrays
Subsets with Fixed Average
Two Array Average
Pyramid Array
Permutation Subsequence
Bit Inversions
Writing Numbers
Letter Pair Move Game
Maximum Building I
Sorting Methods
Cyclic Array
List of Sums
Additional Problems II (30)
Bouncing Ball Steps
Bouncing Ball Cycle
Knight Moves Queries
K Subset Sums I
K Subset Sums II
Increasing Array II
Food Division
Swap Round Sorting
Binary Subsequences
School Excursion
Coin Grid
Grid Coloring II
Programmers and Artists
Removing Digits II
Coin Arrangement
Replace with Difference
Grid Puzzle I
Grid Puzzle II
Bit Substrings
Reversal Sorting
Book Shop II
GCD Subsets
Minimum Cost Pairs
Same Sum Subsets
Mex Grid Queries
Maximum Building II
Stick Divisions
Stick Difference
Coding Company
Two Stacks Sorting
CSES Tracker