Road Repair in Treeland

*special problem, binary search, dp, trees

Lost Nodes

dp, graphs, interactive, sortings, trees

Tree of Life (hard)

trees

Dušan's Railway

divide and conquer, graphs, trees

Spiderweb Trees

dp, geometry, trees

Assigning Fares

dp, trees

Public Service

constructive algorithms, graphs, trees

King's Path

*special problem, math, trees

Pisces

data structures, flows, trees

Red Blue Tree

data structures, implementation, trees

Tree of Life (medium)

constructive algorithms, hashing, trees

My Beautiful Madness

data structures, trees

An easy problem about trees

dp, games, greedy, trees

Finding the Vertex

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

Cheat and Win

bitmasks, data structures, games, trees

Strange device

binary search, interactive, math, trees

Upside Down

data structures, string suffix structures, strings, trees

Help King

implementation, probabilities, trees

New Year Running

number theory, trees

Visible Black Areas

data structures, dsu, geometry, trees

Verifying Kingdom

binary search, divide and conquer, interactive, trees

Communism

bitmasks, dp, trees

Ember and Storm's Tree Game

combinatorics, dp, games, trees

Range Diameter Sum

data structures, trees

Restore the Tree

graphs, greedy, trees

Rap God

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

Tree and Table

dfs and similar, dp, implementation, trees

Cactus to Tree

dp, graphs, trees

Sloth

dfs and similar, dp, graph matchings, trees

Train Tracks

data structures, trees

Moonwalk challenge

data structures, strings, trees

Journey

data structures, divide and conquer, graphs, trees

Boring Card Game

data structures, greedy, trees

Santa's Gift

data structures, trees

Escaping on Beaveractor

data structures, implementation, trees

Exam

data structures, string suffix structures, trees

Ants

2-sat, data structures, trees

Squares

constructive algorithms, data structures, dp, graphs, trees

Galaxy Union

dp, trees, two pointers

Euler tour

constructive algorithms, trees

Iqea

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

Tree

fft, graphs, trees

Island Puzzle

dfs and similar, dsu, graphs, trees

Star Trek

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

Two Rooted Trees

data structures, implementation, trees

Perpetual Motion Machine

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

Harry Vs Voldemort

dfs and similar, dp, graphs, trees

ELCA

data structures, trees

Heaps

dp, trees

Baldman and the military

dfs and similar, graphs, trees

Send the Fool Further! (hard)

dfs and similar, dp, math, trees

Send Tree to Charlie

combinatorics, dfs and similar, dsu, trees

Sasha and Algorithm of Silence's Sounds

data structures, trees

Tree nesting

combinatorics, graphs, trees

Iron Man

data structures, geometry, trees

Furukawa Nagisa's Tree

binary search, divide and conquer, sortings, trees

Modernization of Treeland

*special problem, dfs and similar, trees

Shifting Dominoes

data structures, geometry, graphs, trees

Reunion

combinatorics, dp, trees

Find String in a Grid

data structures, dp, strings, trees

Problem of offices

constructive algorithms, dfs and similar, dp, trees

Tree or not Tree

data structures, divide and conquer, implementation, trees

Anagram Paths

dp, implementation, trees

Tree Calendar

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

New Year and Social Network

data structures, graph matchings, graphs, math, trees

AB Tree

dp, greedy, trees

Berland Miners

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

Distance Matching

constructive algorithms, dfs and similar, trees

Game On Tree

data structures, dfs and similar, greedy, trees

Raining season

data structures, divide and conquer, trees

Inverse Genealogy

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

Double Tree

data structures, divide and conquer, shortest paths, trees

Can Bash Save the Day?

data structures, divide and conquer, graphs, trees

Last chance

data structures, flows, graph matchings, graphs, trees

Madness

constructive algorithms, dfs and similar, trees

Nikita and game

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

Leaders

dfs and similar, dsu, graphs, trees

In a Trap

trees

Pairs

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

Directing Edges

dfs and similar, dp, graphs, trees

Random Forest Rank

dp, graph matchings, math, trees

Mashtali and Hagh Trees

combinatorics, dp, trees

Alien DNA

data structures, dsu, trees

Tree Elimination

dp, trees

Tavas on the Path

data structures, divide and conquer, trees

Johnny and James

greedy, implementation, math, trees

Red-Black Cobweb

data structures, divide and conquer, implementation, trees

Legendary Tree

binary search, interactive, trees

May Holidays

data structures, trees

The Majestic Brown Tree Snake

dfs and similar, dp, greedy, trees, two pointers

Around the World

bitmasks, combinatorics, dfs and similar, dp, graphs, graphs, math, trees

Bear and Chemistry

data structures, dfs and similar, graphs, trees

Matches Are Not a Child's Play

data structures, trees

Berland SU Computer Network

dfs and similar, hashing, trees

Yuezheng Ling and Dynamic Tree

data structures, trees

Uniformly Branched Trees

combinatorics, dp, trees

James and the Chase

dfs and similar, graphs, probabilities, trees

Masha and Cactus

dp, trees

Black, White and Grey Tree

binary search, constructive algorithms, dfs and similar, dp, greedy, trees

Andrew and Chemistry

dp, hashing, trees