Graph Composition

dfs and similar, dsu, graphs, greedy

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

Turtle and Multiplication

constructive algorithms, dfs and similar, graphs, number theory

Yasya and the Mysterious Tree

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

Kostyanych's Theorem

brute force, constructive algorithms, graphs, interactive

Large Graph

data structures, dfs and similar, dsu, graphs, number theory, two pointers

Tensor

constructive algorithms, graphs, interactive

Cat, Fox and Swaps

graphs, math, sortings

±1

2-sat, dfs and similar, graphs

Min-Fund Prison (Hard)

bitmasks, dfs and similar, dp, graphs, trees

Min-Fund Prison (Medium)

brute force, dfs and similar, dp, graphs, trees

Permutation Game

brute force, dfs and similar, games, graphs, greedy, math

Long Way to be Non-decreasing

binary search, dfs and similar, graphs, implementation, shortest paths, two pointers

Equal Trees

*special problem, graphs, meet-in-the-middle

Nene and the Passing Game

constructive algorithms, data structures, dsu, graphs, sortings

Growing Trees

binary search, constructive algorithms, flows, graphs, greedy

Shuffling Songs

bitmasks, dfs and similar, dp, graphs, hashing, implementation, strings

Amanda the Amoeba

graphs, implementation, trees, two pointers

Disks

dfs and similar, geometry, graph matchings, graphs

Scooter

graphs, greedy

Clique Partition

brute force, constructive algorithms, graphs, greedy, implementation

Arrow Path

brute force, constructive algorithms, dfs and similar, dp, graphs, shortest paths

Destroying Bridges

graphs, greedy, math

Rudolf and Subway

constructive algorithms, dfs and similar, graphs, shortest paths

Burenka and Pether

*special problem, data structures, dfs and similar, divide and conquer, dsu, graphs, sortings, trees

Parallel Universes

*special problem, constructive algorithms, dfs and similar, dsu, graphs

Evidence Board

*special problem, constructive algorithms, dfs and similar, graphs, trees

Pokémon Arena

data structures, graphs, greedy, implementation, shortest paths, sortings

Turtle Mission: Robot and the Earthquake

dfs and similar, dp, graphs, shortest paths

Moving Platforms

graphs, math, number theory, shortest paths

Chat Screenshots

combinatorics, dfs and similar, graphs

Sasha and the Happy Tree Cutting

bitmasks, brute force, dfs and similar, dp, graphs, greedy, math, trees

Modular Sequence

brute force, constructive algorithms, dp, graphs, greedy, math, number theory

Microcycle

data structures, dfs and similar, dsu, graphs, greedy, implementation, sortings, trees

Vlad and Trouble at MIT

dfs and similar, dp, flows, graphs, greedy, implementation, trees

Count Paths

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

Smooth Sailing (Hard Version)

binary search, data structures, dsu, geometry, graphs, trees

Smooth Sailing (Easy Version)

binary search, brute force, data structures, dfs and similar, dsu, graphs, shortest paths

Caterpillar on a Tree

dfs and similar, graphs, greedy, implementation, sortings, trees

Group Division

constructive algorithms, dfs and similar, graphs, greedy

Bicycles

graphs, greedy, implementation, shortest paths, sortings