Queries for the Array

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

Where is the Pizza?

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

Phase Shift

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

Link Cut Centroids

constructive algorithms, dfs and similar, graphs, trees

Xor-tree

dfs and similar, trees

Timofey and a tree

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

Round Dance

dfs and similar, dsu, graphs, shortest paths

Igor In the Museum

dfs and similar, graphs, shortest paths

Anji's Binary Tree

dfs and similar, dp, trees

Cover it!

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

Coloring a Tree

dfs and similar, dsu, greedy

Infected Tree

dfs and similar, dp, trees

Graph Without Long Directed Paths

dfs and similar, graphs

Cut 'em all!

dfs and similar, dp, graphs, greedy, trees

Valera and Tubes

constructive algorithms, dfs and similar, implementation

Plus from Picture

dfs and similar, implementation, strings

Anonymous Informant

brute force, dfs and similar, graphs, implementation

Queen

dfs and similar, trees

The Way to Home

dfs and similar, dp, greedy, implementation

PolandBall and Forest

dfs and similar, dsu, graphs, interactive, trees

Gardener and Tree

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

Students and Shoelaces

brute force, dfs and similar, graphs, implementation

Perfect Keyboard

dfs and similar, greedy, implementation

Edgy Trees

dfs and similar, dsu, graphs, math, trees

Unforgivable Curse (hard version)

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

Mr. Kitayuta's Colorful Graph

dfs and similar, dp, dsu, graphs

DZY Loves Chemistry

dfs and similar, dsu, greedy

Split Into Two Sets

dfs and similar, dsu, graphs

Copil Copac Draws Trees

dfs and similar, dp, graphs, trees

Lomsat gelral

data structures, dfs and similar, dsu, trees

Ehab and Path-etic MEXs

constructive algorithms, dfs and similar, greedy, trees

Checkposts

dfs and similar, graphs, two pointers

King Escape

dfs and similar, graphs, implementation

Fillomino 2

constructive algorithms, dfs and similar, greedy, implementation

Transformation: from A to B

brute force, dfs and similar, math

Secret Passwords

dfs and similar, dsu, graphs

Protect Sheep

brute force, dfs and similar, graphs, implementation

Fox And Two Dots

dfs and similar

Distance in Tree

dfs and similar, dp, trees

Minimum Ties

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

NP-Hard Problem

dfs and similar, graphs

Valid BFS?

dfs and similar, graphs, shortest paths, trees

Parsa's Humongous Tree

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

Not Assigning

constructive algorithms, dfs and similar, number theory, trees

Arrow Path

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

White-Black Balanced Subtrees

dfs and similar, dp, graphs, trees

Masha and a Beautiful Tree

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

Bear and Friendship Condition

dfs and similar, dsu, graphs

Fox And Names

dfs and similar, graphs, sortings

K-Complete Word

dfs and similar, dsu, greedy, implementation, strings

Reposts

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

Journey

dfs and similar, dp, graphs, probabilities, trees

Mahmoud and Ehab and the bipartiteness

dfs and similar, graphs, trees

Forever Winter

dfs and similar, graphs, math

Solve The Maze

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

Binary String Reconstruction

constructive algorithms, dfs and similar, math

Books Exchange (hard version)

dfs and similar, dsu, math

Rudolf and the Ball Game

dfs and similar, dp, implementation

Getting Zero

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

News Distribution

dfs and similar, dsu, graphs

Apple Tree

combinatorics, dfs and similar, dp, math, trees

Soldier and Cards

brute force, dfs and similar, games

Fall Down

dfs and similar, implementation

Divide by three, multiply by two

dfs and similar, math, sortings

Learning Languages

dfs and similar, dsu

The Lakes

dfs and similar, dsu, graphs, implementation

WeirdSort

dfs and similar, sortings

Permutation Transformation

dfs and similar, divide and conquer, implementation

Cyclic Components

dfs and similar, dsu, graphs

Linova and Kingdom

dfs and similar, dp, greedy, sortings, trees

Badge

brute force, dfs and similar, graphs

Ice Skating

brute force, dfs and similar, dsu, graphs

Maze

dfs and similar

Rumor

dfs and similar, graphs, greedy

Districts Connection

constructive algorithms, dfs and similar

Computer Game

brute force, dfs and similar, dp, implementation

Gregor and the Pawn Game

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

Gold Rush

brute force, dfs and similar, dp, implementation

Make it Divisible by 25

dfs and similar, dp, greedy, math, math

Frog Jumps

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

DZY Loves Chessboard

dfs and similar, implementation

Party

dfs and similar, graphs, trees

Kefa and Park

dfs and similar, graphs, trees

BerSU Ball

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

Two Buttons

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

New Year Transportation

dfs and similar, graphs, implementation