Cactus Connectivity

Three-Dimensional Embedding

Control Towers

I've Been Flipping Numbers for 300 Years and Calculated the Sum

binary search, brute force, combinatorics, divide and conquer, math, number theory

Goodbye, Banker Life

2-sat, bitmasks, combinatorics, constructive algorithms, fft, math, number theory

Towering Arrays

binary search, data structures

LeaFall

combinatorics, dp, probabilities, trees

Infinite Sequence (Hard Version)

bitmasks, brute force, constructive algorithms, data structures, dp, implementation, math

Infinite Sequence (Easy Version)

bitmasks, brute force, dp, implementation, math

Trapmigiano Reggiano

constructive algorithms, data structures, dfs and similar, dp, greedy, sortings, trees

Friends and Pizza

bitmasks, divide and conquer, dp, fft

Game with Binary String

constructive algorithms, data structures, divide and conquer, games, greedy, math

Tree Jumps

dfs and similar, dp, trees

Graph Inclusion

data structures, dfs and similar, divide and conquer, dsu, graphs

A, B, AB and BA

constructive algorithms, greedy, sortings, strings

Palindrome Shuffle

binary search, greedy, hashing, strings, two pointers

Amusement Park Rides

flows, graphs

The Ultimate Wine Tasting Event

combinatorics, greedy

Pinball

graphs, shortest paths

Statues

constructive algorithms, greedy, math

A Very Long Hike

shortest paths

Mascot Naming

brute force, greedy, implementation, strings

Porto Vs. Benfica

data structures, dfs and similar, dsu, graphs, shortest paths

Morse Code

dp, sortings, trees

Ads

binary search, greedy, two pointers

Urban Planning

constructive algorithms

Condorcet Elections

constructive algorithms, graphs, greedy, probabilities

Curse

constructive algorithms, dp, math

Tropical Season

binary search, data structures, greedy, implementation

Club of Young Aircraft Builders (hard version)

combinatorics, dp, math

Club of Young Aircraft Builders (easy version)

combinatorics, dp, math

Bitwise Slides

bitmasks, combinatorics, dp, math

White Magic

constructive algorithms, data structures, dp, greedy, implementation

Bro Thinks He's Him

combinatorics, data structures, divide and conquer, dp, math, matrices

Skibidus and Capping

combinatorics, math, number theory

Skibidus and Slay

data structures, dfs and similar, graphs, greedy, trees

Skibidus and Rizz

constructive algorithms, greedy, strings

We Be Summing

binary search, data structures, dp, two pointers

Mycraft Sand Sort

combinatorics, data structures, dsu, greedy, math, sortings

Eating

binary search, bitmasks, brute force, data structures, dp, greedy, trees, two pointers

Counting Is Not Fun (Hard Version)

combinatorics, data structures, dfs and similar, dsu, graphs, implementation, trees

Counting Is Not Fun (Easy Version)

combinatorics, data structures, dfs and similar, dp, dsu, graphs, hashing, implementation, math, trees

Triangle Tree

data structures, dfs and similar, dp, greedy, trees

Game With Triangles

binary search, brute force, data structures, geometry, greedy, implementation, math, ternary search, two pointers

Remove Exactly Two

brute force, data structures, dfs and similar, dp, graphs, greedy, sortings, trees

Galaxy Generator

bitmasks, combinatorics, dp

Permutation Factory

flows, geometry, graph matchings, graphs

Traveling Salescat

constructive algorithms, dp, geometry, graphs, greedy, math, sortings

The Game (Hard Version)

data structures, dfs and similar, games, graphs, implementation, trees

The Game (Easy Version)

data structures, dfs and similar, games, graphs, greedy, trees

Balanced Tree

dfs and similar, dp, graphs, greedy, trees

Kevin and Nivek

divide and conquer, dp

Kevin and Stones (Hard Version)

flows, graphs

Kevin and Stones (Easy Version)

flows, graph matchings, graphs

Kevin and Teams

constructive algorithms, graphs, interactive

Kevin and Binary String (Hard Version)

data structures, dp

Kevin and Binary String (Easy Version)

greedy, implementation

Kevin and And

bitmasks, brute force, dp, greedy, math, sortings

Kevin and Numbers

bitmasks, data structures

Kevin and Puzzle

2-sat, combinatorics, dp

Bugged Sort

dp, greedy, sortings

Multiplicative Arrays

combinatorics, dp, number theory

Stop Gaming (Hard Version)

brute force, constructive algorithms, data structures, hashing, strings

Stop Gaming (Easy Version)

brute force, constructive algorithms, greedy, hashing, strings

Graph and Graph

data structures, graphs, greedy, shortest paths

Customer Service

brute force, constructive algorithms, graph matchings, greedy, math, sortings

Coffee Break

data structures, greedy, math

Secret Message

constructive algorithms, dfs and similar, math

Formation

binary search, data structures, dp, sortings, two pointers

Another Exercise on Graphs (hard version)

binary search, dfs and similar, dp, dsu, graphs, shortest paths, sortings

Another Exercise on Graphs (Easy Version)

binary search, brute force, dp, dsu, graphs, shortest paths, sortings

Gifts Order

data structures, greedy, implementation, math, matrices

Xor of Median (Hard Version)

bitmasks, brute force, combinatorics, dp, math

Xor of Median (Easy Version)

bitmasks, brute force, combinatorics, dp, math

Nested Segments

combinatorics, dfs and similar, dp, dsu, math

Unique Median

binary search, brute force, combinatorics, data structures, divide and conquer, dp

Cosmic Divide

brute force, geometry, hashing, math, strings

Haystacks

brute force, constructive algorithms, data structures, greedy, sortings

Scarecrow

greedy, implementation, math

Affectionate Arrays (Hard Version)

data structures, dp, graphs, greedy, math, shortest paths, two pointers

Affectionate Arrays (Easy Version)

data structures, dp, greedy

Delicate Anti-monotonous Operations

constructive algorithms, implementation

Naive String Splits

binary search, brute force, greedy, hashing, math, number theory, strings

Earnest Matrix Complement

brute force, data structures, dp, greedy, implementation, math

Resourceful Caterpillar Sequence

dfs and similar, dp, games, graphs, greedy, trees

Refined Product Optimality

binary search, data structures, greedy, math, schedules, sortings

Managing Cluster

dp, graphs, math, trees

Legacy Screensaver

Knowns and Unknowns

Judicious Watching

binary search, greedy, sortings

Incompetent Delivery Guy

graphs, shortest paths

Hunting Hoglins in Hogwarts

interactive

Geometric Balance

data structures, geometry, implementation

Fix Flooded Floor

constructive algorithms, dp, graphs

Expression Correction

brute force, expression parsing, strings

DAG Serialization

brute force, graphs

Cactus without Bridges

constructive algorithms, math

BitBitJump

Adrenaline Rush

constructive algorithms

Snakes

bitmasks, dp, dsu, graphs