From Kazan with Love

dfs and similar, graphs, implementation, trees

Variables and Operations

graphs, greedy, shortest paths

Tree Colorings

combinatorics, dfs and similar, dp, graphs, math, number theory, trees

Reachability and Tree

constructive algorithms, dfs and similar, graphs, trees

Melody

dfs and similar, graphs, implementation

Fewer Batteries

binary search, dfs and similar, dp, graphs, greedy, hashing

Penguin Steps

binary search, dfs and similar, flows, graphs, shortest paths

D/D/D

dfs and similar, graphs, greedy, shortest paths

Spruce Dispute

constructive algorithms, dfs and similar, graphs, greedy, implementation, shortest paths, trees

Neo's Escape

binary search, brute force, data structures, dp, dsu, graphs, greedy, implementation

Modulo 3

data structures, divide and conquer, dsu, graphs, trees

Baggage Claim

combinatorics, dfs and similar, dp, dsu, graphs, implementation, math, trees

She knows...

combinatorics, constructive algorithms, graphs, math

Gleb and Boating

brute force, constructive algorithms, data structures, dp, graphs, greedy, math, number theory, shortest paths

Disappearing Permutation

dfs and similar, dp, dsu, graphs, greedy, implementation

MST in Modulo Graph

constructive algorithms, dsu, graphs, greedy, math, number theory, sortings, trees

Strong Connectivity Strikes Back

*special problem, constructive algorithms, graphs

Vicious Labyrinth

constructive algorithms, graphs, greedy, implementation, math

RGB Walking

bitmasks, chinese remainder theorem, dfs and similar, graphs, number theory

Equalization

bitmasks, brute force, dp, graphs, math

Graph Inclusion

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

Amusement Park Rides

flows, graphs

Pinball

graphs, shortest paths

Porto Vs. Benfica

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

Condorcet Elections

constructive algorithms, graphs, greedy, probabilities

Object Identification

graphs, greedy, implementation, interactive

Skibidus and Slay

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

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

Remove Exactly Two

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

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 Stones (Hard Version)

flows, graphs

Kevin and Stones (Easy Version)

flows, graph matchings, graphs

Kevin and Teams

constructive algorithms, graphs, interactive

Graph Composition

dfs and similar, dsu, graphs, greedy

Graph and Graph

data structures, graphs, greedy, shortest paths

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

Find the Permutation

brute force, dfs and similar, graphs, implementation, sortings

Affectionate Arrays (Hard Version)

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

Resourceful Caterpillar Sequence

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

Managing Cluster

dp, graphs, math, trees

Incompetent Delivery Guy

graphs, shortest paths

Fix Flooded Floor

constructive algorithms, dp, graphs

DAG Serialization

brute force, graphs

Snakes

bitmasks, dp, dsu, graphs

Kevin and Bipartite Graph

constructive algorithms, graphs, greedy

For the Emperor!

flows, graphs

Mirror Maze

brute force, dfs and similar, graphs, implementation

X Aura

graphs, math, shortest paths

Medium Demon Problem (hard version)

dfs and similar, dp, dsu, graphs, implementation, trees

Medium Demon Problem (easy version)

dfs and similar, graph matchings, graphs, implementation, trees

Matrix Transformation

bitmasks, brute force, data structures, dfs and similar, graphs, greedy, implementation

Trophic Balance Species

binary search, brute force, dfs and similar, graphs

Drunken Maze

brute force, dfs and similar, graphs, shortest paths

Control of Randomness

combinatorics, dfs and similar, dp, graphs, greedy, math, probabilities, trees

Trapped in the Witch's Labyrinth

constructive algorithms, dfs and similar, graphs, implementation

Sakurako, Kosuke, and the Permutation

brute force, data structures, dfs and similar, dsu, graphs, greedy, math

Genokraken

constructive algorithms, data structures, graphs, greedy, implementation, interactive, trees, two pointers

Variance Challenge

flows, graphs, greedy

Palindrome Everywhere

constructive algorithms, graphs, greedy

Cool Graph

constructive algorithms, data structures, dfs and similar, dsu, graphs, greedy, trees

Alice's Adventures in Cards

constructive algorithms, data structures, dp, graphs, greedy, implementation, ternary search

The Endspeaker (Easy Version)

binary search, dp, graphs, greedy, implementation, two pointers

Add Zeros

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

Best Subsequence

bitmasks, dfs and similar, flows, graph matchings, graphs

Choose Your Queries

constructive algorithms, dfs and similar, dp, graphs, greedy, trees

C+K+S

constructive algorithms, dfs and similar, graphs, greedy, hashing, implementation, strings

Skipping

binary search, dp, graphs, shortest paths

Billetes MX (Hard Version)

binary search, combinatorics, data structures, dsu, graphs

Billetes MX (Easy Version)

2-sat, binary search, combinatorics, constructive algorithms, dfs and similar, dsu, graphs

Digital Village (Extreme Version)

data structures, dfs and similar, dp, dsu, graphs, greedy, math, trees

Digital Village (Hard Version)

data structures, dp, dsu, graphs, math, trees

Digital Village (Easy Version)

brute force, data structures, dfs and similar, dp, dsu, fft, graphs, greedy, implementation, math, trees

Connect the Dots

brute force, dp, dsu, graphs, math, trees

Rendez-vous de Marian et Robin

dfs and similar, graphs, shortest paths

Strange Matrix

*special problem, graphs, greedy

Sakurako's Hobby

dp, dsu, graphs, math

Dora's Paint

brute force, combinatorics, constructive algorithms, graphs, implementation

Iris and Game on the Tree

constructive algorithms, dfs and similar, games, graphs, greedy, trees

Colored Portals

binary search, brute force, data structures, graphs, greedy, implementation, shortest paths

Turtle and a MEX Problem (Hard Version)

dfs and similar, dp, graphs, greedy, implementation, math

DFS Checker (Hard Version)

binary search, data structures, dfs and similar, graphs, hashing, trees

DFS Checker (Easy Version)

brute force, data structures, dfs and similar, graphs, hashing, trees

Call During the Journey

binary search, brute force, graphs, greedy, shortest paths

Determine Winning Islands in Race

data structures, dp, graphs, greedy, shortest paths

Penacony

brute force, data structures, graphs, greedy, hashing

Minecraft

bitmasks, brute force, dp, graphs, math

Stardew Valley

constructive algorithms, dfs and similar, graphs, trees

Funny Game

constructive algorithms, dsu, graphs, greedy, math, number theory, trees

Coloring Game

constructive algorithms, dfs and similar, games, graphs, greedy, interactive

Prime XOR Coloring

bitmasks, constructive algorithms, graphs, greedy, math, number theory

Simultaneous Coloring

dfs and similar, divide and conquer, graphs

Non-academic Problem

dfs and similar, graphs, trees

Maximize the Largest Component (Easy Version)

brute force, data structures, dfs and similar, dsu, graphs, implementation

Turtle and Intersected Segments

data structures, dsu, graphs, greedy