New Year Transportation

dfs and similar, graphs, implementation

Two Buttons

dfs and similar, graphs, greedy, implementation, math, shortest paths

BerSU Ball

dfs and similar, dp, graph matchings, greedy, sortings, two pointers

Kefa and Park

dfs and similar, graphs, trees

Party

dfs and similar, graphs, trees

DZY Loves Chessboard

dfs and similar, implementation

Frog Jumps

binary search, data structures, dfs and similar, greedy, implementation

Make it Divisible by 25

dfs and similar, dp, greedy, math, math

Gold Rush

brute force, dfs and similar, dp, implementation

Gregor and the Pawn Game

dfs and similar, dp, flows, graph matchings, graphs, greedy, implementation

Computer Game

brute force, dfs and similar, dp, implementation

Districts Connection

constructive algorithms, dfs and similar

Rumor

dfs and similar, graphs, greedy

Maze

dfs and similar

Ice Skating

brute force, dfs and similar, dsu, graphs

Badge

brute force, dfs and similar, graphs

Linova and Kingdom

dfs and similar, dp, greedy, sortings, trees

Cyclic Components

dfs and similar, dsu, graphs

Permutation Transformation

dfs and similar, divide and conquer, implementation

WeirdSort

dfs and similar, sortings

The Lakes

dfs and similar, dsu, graphs, implementation

Learning Languages

dfs and similar, dsu

Divide by three, multiply by two

dfs and similar, math, sortings

Fall Down

dfs and similar, implementation

Soldier and Cards

brute force, dfs and similar, games

News Distribution

dfs and similar, dsu, graphs

Apple Tree

combinatorics, dfs and similar, dp, math, trees

Getting Zero

bitmasks, brute force, dfs and similar, dp, graphs, greedy, shortest paths

Rudolf and the Ball Game

dfs and similar, dp, implementation

Binary String Reconstruction

constructive algorithms, dfs and similar, math

Books Exchange (hard version)

dfs and similar, dsu, math

Forever Winter

dfs and similar, graphs, math

Solve The Maze

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

Mahmoud and Ehab and the bipartiteness

dfs and similar, graphs, trees

Journey

dfs and similar, dp, graphs, probabilities, trees

Reposts

*special problem, dfs and similar, dp, graphs, trees

K-Complete Word

dfs and similar, dsu, greedy, implementation, strings

Fox And Names

dfs and similar, graphs, sortings

Bear and Friendship Condition

dfs and similar, dsu, graphs

Masha and a Beautiful Tree

dfs and similar, divide and conquer, graphs, sortings, trees

Arrow Path

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

White-Black Balanced Subtrees

dfs and similar, dp, graphs, trees

Not Assigning

constructive algorithms, dfs and similar, number theory, trees

Lunar New Year and a Wander

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

Game on Ranges

brute force, dfs and similar, implementation, sortings

Parsa's Humongous Tree

dfs and similar, divide and conquer, dp, greedy, trees

Valid BFS?

dfs and similar, graphs, shortest paths, trees

NP-Hard Problem

dfs and similar, graphs

Minimum Ties

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

Distance in Tree

dfs and similar, dp, trees

Fox And Two Dots

dfs and similar

Protect Sheep

brute force, dfs and similar, graphs, implementation

Secret Passwords

dfs and similar, dsu, graphs

Transformation: from A to B

brute force, dfs and similar, math

Fillomino 2

constructive algorithms, dfs and similar, greedy, implementation

King Escape

dfs and similar, graphs, implementation

Checkposts

dfs and similar, graphs, two pointers

Ehab and Path-etic MEXs

constructive algorithms, dfs and similar, greedy, trees

Lomsat gelral

data structures, dfs and similar, dsu, trees

Copil Copac Draws Trees

dfs and similar, dp, graphs, trees

Split Into Two Sets

dfs and similar, dsu, graphs

DZY Loves Chemistry

dfs and similar, dsu, greedy

Mr. Kitayuta's Colorful Graph

dfs and similar, dp, dsu, graphs

Unforgivable Curse (hard version)

brute force, constructive algorithms, dfs and similar, dsu, graphs, greedy, strings

Edgy Trees

dfs and similar, dsu, graphs, math, trees

Perfect Keyboard

dfs and similar, greedy, implementation

Students and Shoelaces

brute force, dfs and similar, graphs, implementation

PolandBall and Forest

dfs and similar, dsu, graphs, interactive, trees

Gardener and Tree

brute force, data structures, dfs and similar, greedy, implementation, trees

The Way to Home

dfs and similar, dp, greedy, implementation

Queen

dfs and similar, trees

Anonymous Informant

brute force, dfs and similar, graphs, implementation

Plus from Picture

dfs and similar, implementation, strings

Permutation Game

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

Valera and Tubes

constructive algorithms, dfs and similar, implementation

Cut 'em all!

dfs and similar, dp, graphs, greedy, trees

Graph Without Long Directed Paths

dfs and similar, graphs

Igor In the Museum

dfs and similar, graphs, shortest paths

Infected Tree

dfs and similar, dp, trees

Coloring a Tree

dfs and similar, dsu, greedy

Cover it!

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

Anji's Binary Tree

dfs and similar, dp, trees

Round Dance

dfs and similar, dsu, graphs, shortest paths

Timofey and a tree

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

Xor-tree

dfs and similar, trees

Link Cut Centroids

constructive algorithms, dfs and similar, graphs, trees

Phase Shift

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

Where is the Pizza?

data structures, dfs and similar, dsu, graphs, implementation, math

Queries for the Array

data structures, dfs and similar, implementation, strings, trees

Nastya and Potions

dfs and similar, dp, graphs, sortings

Military Problem

dfs and similar, graphs, trees

Valera and Elections

dfs and similar, graphs, trees

Uncle Bogdan and Country Happiness

dfs and similar, greedy, math, trees

Substring

dfs and similar, dp, graphs

Required Length

brute force, dfs and similar, dp, hashing, shortest paths

Colorful Graph

brute force, dfs and similar, graphs

Set Construction

constructive algorithms, dfs and similar, graphs, greedy

Maximum White Subtree

dfs and similar, dp, graphs, trees

Swap Adjacent Elements

dfs and similar, greedy, math, sortings, two pointers

Maximum Distributed Tree

dfs and similar, dp, greedy, implementation, math, number theory, sortings, trees