Recover it!

dfs and similar, graphs, greedy, number theory, sortings

Cyclic Operations

brute force, constructive algorithms, dfs and similar, graphs, greedy, implementation

Journey

dp, graphs

Bicycles

graphs, greedy, implementation, shortest paths, sortings

Friendly Spiders

dfs and similar, graphs, math, number theory, shortest paths

Selling a Menagerie

dfs and similar, dsu, graphs, implementation, math

Shortest and Longest LIS

constructive algorithms, graphs, greedy, two pointers

A Wide, Wide Graph

dfs and similar, dp, graphs, greedy, trees

Eternal Victory

dfs and similar, graphs, greedy, shortest paths, trees

Array Differentiation

bitmasks, brute force, constructive algorithms, dfs and similar, dp, graphs, math

Lucky Permutation

constructive algorithms, dfs and similar, graphs, greedy

Path Queries

divide and conquer, dsu, graphs, sortings, trees

Minimum Euler Cycle

constructive algorithms, graphs, greedy, implementation

Labyrinth

graphs, shortest paths

String Coloring (easy version)

constructive algorithms, dp, graphs, greedy, sortings

Paint the Tree

brute force, constructive algorithms, dp, graphs, implementation, trees

Explorer Space

dp, graphs, shortest paths

Christmas Trees

graphs, greedy, shortest paths

King's Path

dfs and similar, graphs, hashing, shortest paths

Book

binary search, brute force, data structures, dp, graphs, implementation, sortings

Maximum White Subtree

dfs and similar, dp, graphs, trees

Carousel

constructive algorithms, dp, graphs, greedy, math

Magic Tricks

*special problem, dp, graphs

Variable, or There and Back Again

dfs and similar, graphs

Cycle In Maze

*special problem, dfs and similar, graphs, greedy, shortest paths

System Administrator

graphs

Colored Rooks

constructive algorithms, graphs

Train Splitting

constructive algorithms, graphs, greedy

Lazy Student

constructive algorithms, data structures, graphs

MADMAX

dfs and similar, dp, games, graphs

Phillip and Trains

dfs and similar, graphs, shortest paths

Railway System

constructive algorithms, graphs, greedy, interactive, sortings

Cow Program

dfs and similar, dp, graphs

Tree Diameter

bitmasks, graphs, interactive

Graph And Its Complement

constructive algorithms, graphs, implementation

Cutting Figure

constructive algorithms, graphs, trees

Planets

binary search, data structures, graphs, shortest paths

Array Stabilization (AND version)

brute force, graphs, math, number theory, shortest paths

Maximize the Largest Component (Easy Version)

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

Mail Stamps

data structures, dfs and similar, graphs, implementation

Anadi and Domino

brute force, graphs

Fix a Tree

constructive algorithms, dfs and similar, dsu, graphs, trees

The Tag Game

dfs and similar, graphs

Gardening Friends

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

Navigation System

dfs and similar, graphs, shortest paths

Relatively Prime Graph

brute force, constructive algorithms, graphs, greedy, math

Minimum Maximum Distance

dfs and similar, dp, graphs, shortest paths, trees

Game Master

data structures, dfs and similar, dp, graphs, greedy, two pointers

Unbearable Controversy of Being

brute force, combinatorics, dfs and similar, graphs

Anna, Svyatoslav and Maps

dp, graphs, greedy, shortest paths

Candy Party (Easy Version)

bitmasks, constructive algorithms, graphs, greedy, implementation, math

Shifting String

graphs, math, number theory, strings

Mad City

dfs and similar, dsu, games, graphs, shortest paths, trees

SlavicG's Favorite Problem

bitmasks, dfs and similar, graphs

The Number of Imposters

constructive algorithms, dfs and similar, dp, dsu, graphs

Mouse Hunt

dfs and similar, graphs

Chat Screenshots

combinatorics, dfs and similar, graphs

Bakry and Partitioning

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

Nastya and Scoreboard

bitmasks, dp, graphs, greedy

The Third Letter

dfs and similar, dsu, graphs, greedy, implementation

Peaceful Rooks

dfs and similar, dsu, graphs

Xenia and Weights

constructive algorithms, dfs and similar, dp, graphs, greedy, shortest paths

Johnny and Contribution

constructive algorithms, graphs, greedy, sortings

Beautiful Graph

dfs and similar, graphs

Choosing Capital for Treeland

dfs and similar, dp, graphs, trees

Harmonious Graph

constructive algorithms, dfs and similar, dsu, graphs, greedy, sortings

Cow and Snacks

dfs and similar, dsu, graphs

Substring

dfs and similar, dp, graphs

Link Cut Centroids

constructive algorithms, dfs and similar, graphs, trees

String Transformation 1

dsu, graphs, greedy, sortings, strings, trees, two pointers

Zero Path

brute force, data structures, dp, graphs, greedy, shortest paths

Igor In the Museum

dfs and similar, graphs, shortest paths

Cover it!

dfs and similar, dsu, graphs, shortest paths, trees

Graph Without Long Directed Paths

dfs and similar, graphs

Checkposts

dfs and similar, graphs, two pointers

Greg and Graph

dp, graphs, shortest paths

Valid BFS?

dfs and similar, graphs, shortest paths, trees

Solve The Maze

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

Constructing the Dungeon

*special problem, graphs, greedy

Cycles

binary search, constructive algorithms, graphs, greedy

Text Editor

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

Bear and Two Paths

constructive algorithms, graphs

Party

constructive algorithms, graphs, math

Quantity of Strings

combinatorics, dfs and similar, graphs, math

Igor and his way to work

dfs and similar, graphs, implementation, shortest paths

pSort

dfs and similar, dsu, graphs

Subway

dfs and similar, graphs

Road Map

dfs and similar, graphs

Longtail Hedgehog

dp, graphs

Jamie and Interesting Graph

constructive algorithms, graphs, shortest paths

Mike and Shortcuts

dfs and similar, graphs, greedy, shortest paths

Decorate Apple Tree

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

Bear and Forgotten Tree 3

constructive algorithms, graphs, trees

Fight Against Traffic

dfs and similar, graphs, shortest paths

Fair

graphs, greedy, number theory, shortest paths

Socks

dfs and similar, dsu, graphs, greedy

Lakes in Berland

dfs and similar, dsu, graphs, greedy, implementation

Alyona and the Tree

dfs and similar, dp, graphs, trees

Alex's whims

constructive algorithms, graphs, greedy, shortest paths, trees

Social Network

dsu, graphs, greedy, implementation, trees