Road Repair in Treeland

*special problem, binary search, dp, trees

Tree of Life (hard)

trees

Dušan's Railway

divide and conquer, graphs, trees

Spiderweb Trees

dp, geometry, trees

Assigning Fares

dp, trees

King's Path

*special problem, math, trees

Public Service

constructive algorithms, graphs, trees

Poachers

dp, games, graphs, trees

Tree of Life (medium)

constructive algorithms, hashing, trees

An easy problem about trees

dp, games, greedy, trees

Pisces

data structures, flows, trees

Tree and Permutation Game

dfs and similar, games, graphs, trees

Strange device

binary search, interactive, math, trees

Upside Down

data structures, string suffix structures, strings, trees

Finding the Vertex

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

Trains and Airplanes

dfs and similar, graphs, shortest paths, trees

Help King

implementation, probabilities, trees

Alphabetic Tree

binary search, data structures, dfs and similar, hashing, string suffix structures, strings, trees

Tree and Table

dfs and similar, dp, implementation, trees

Cheat and Win

bitmasks, data structures, games, trees

Rap God

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

Verifying Kingdom

binary search, divide and conquer, interactive, trees

New Year Running

number theory, trees

Red Blue Tree

data structures, implementation, trees

Visible Black Areas

data structures, dsu, geometry, trees

My Beautiful Madness

data structures, trees

Restore the Tree

graphs, greedy, trees

Lost Nodes

constructive algorithms, dp, graphs, interactive, sortings, trees

Range Diameter Sum

data structures, trees

Ember and Storm's Tree Game

combinatorics, dp, games, trees

Escaping on Beaveractor

data structures, implementation, trees

Moonwalk challenge

data structures, strings, trees

Cactus to Tree

dp, graphs, trees

Sloth

dfs and similar, dp, graph matchings, trees

Journey

data structures, divide and conquer, graphs, trees

Boring Card Game

data structures, greedy, trees

Train Tracks

data structures, trees

Galaxy Union

dp, trees, two pointers

Communism

bitmasks, dp, trees

Lenient Vertex Cover

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

Iqea

data structures, dfs and similar, divide and conquer, dsu, shortest paths, trees

ELCA

data structures, trees

Euler tour

constructive algorithms, trees

Island Puzzle

dfs and similar, dsu, graphs, trees

Harry Vs Voldemort

dfs and similar, dp, graphs, trees

Baldman and the military

dfs and similar, graphs, trees

Perpetual Motion Machine

constructive algorithms, dp, graphs, implementation, math, trees

Squares

constructive algorithms, data structures, dp, graphs, trees

Tree

fft, graphs, trees

Star Trek

*special problem, combinatorics, dfs and similar, dp, games, graphs, matrices, trees

Two Rooted Trees

data structures, implementation, trees

Snowy Mountain

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

Ants

2-sat, data structures, trees

Santa's Gift

data structures, trees

Omkar and Tours

data structures, divide and conquer, sortings, trees

Squid Game

data structures, dfs and similar, greedy, trees

Send the Fool Further! (hard)

dfs and similar, dp, math, trees

Sasha and Algorithm of Silence's Sounds

data structures, trees

Air Reform

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

Modernization of Treeland

*special problem, dfs and similar, trees

Eye-Pleasing City Park Tour

data structures, trees

Furukawa Nagisa's Tree

binary search, divide and conquer, sortings, trees

Send Tree to Charlie

combinatorics, dfs and similar, dsu, trees

Mashtali vs AtCoder

games, trees

Find String in a Grid

data structures, dp, strings, trees

Heaps

dp, trees

Problem of offices

constructive algorithms, dfs and similar, dp, trees

Iron Man

data structures, geometry, trees

Tree or not Tree

data structures, divide and conquer, implementation, trees

Shifting Dominoes

data structures, geometry, graphs, trees

Gastronomic Event

dp, greedy, trees

Perfect Matching

data structures, divide and conquer, interactive, trees

Exam

data structures, string suffix structures, trees

Anagram Paths

dp, implementation, trees

New Year and Social Network

data structures, graph matchings, graphs, math, trees

Pairs

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

Berland Miners

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

Distance Matching

constructive algorithms, dfs and similar, trees

Alien DNA

data structures, dsu, trees

Tree Calendar

brute force, constructive algorithms, data structures, dfs and similar, sortings, trees

Madness

constructive algorithms, dfs and similar, trees

Tree nesting

combinatorics, graphs, trees

Last chance

data structures, flows, graph matchings, graphs, trees

Raining season

data structures, divide and conquer, trees

Nikita and game

binary search, dfs and similar, divide and conquer, graphs, trees

Reunion

combinatorics, dp, trees

AB Tree

dp, greedy, trees

Tavas on the Path

data structures, divide and conquer, trees

Directing Edges

dfs and similar, dp, graphs, trees

Game On Tree

data structures, dfs and similar, greedy, trees

Johnny and James

greedy, implementation, math, trees

Inverse Genealogy

constructive algorithms, divide and conquer, dp, math, trees

Leaders

dfs and similar, dsu, graphs, trees

Red-Black Cobweb

data structures, divide and conquer, implementation, trees

Berland SU Computer Network

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

May Holidays

data structures, trees

Tree Elimination

dp, trees

Legendary Tree

binary search, interactive, trees

In a Trap

trees

Double Tree

data structures, divide and conquer, shortest paths, trees