Burenka and Pether

*special problem, data structures, dfs and similar, divide and conquer, dsu, graphs, sortings, trees

Road Repair in Treeland

*special problem, binary search, dp, trees

Tree of Life (hard)

trees

Farmer John's Favorite Intern

data structures, dp, flows, trees

Redundant Routes

constructive algorithms, dp, trees

King's Path

*special problem, math, trees

Doremy's Average Tree

data structures, dp, greedy, trees

Goldberg Machine 3

dp, trees

Spiderweb Trees

dp, geometry, trees

Public Service

constructive algorithms, graphs, trees

Standard Graph Problem

data structures, graphs, greedy, trees

Tree of Life (medium)

constructive algorithms, hashing, trees

Doremy's Swapping Trees

dfs and similar, graphs, trees

Assigning Fares

dp, trees

Centroid Guess

interactive, probabilities, trees

An easy problem about trees

dp, games, greedy, trees

Interactive Mex Tree

constructive algorithms, dfs and similar, interactive, trees

Pisces

data structures, flows, trees

Clubstep

binary search, brute force, data structures, greedy, trees

Help King

implementation, probabilities, trees

Upside Down

data structures, string suffix structures, strings, trees

Verifying Kingdom

binary search, divide and conquer, interactive, trees

LuoTianyi and Cartridge

data structures, trees

Visible Black Areas

data structures, dsu, geometry, trees

Tree Diameter

interactive, trees

Finding the Vertex

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

Dušan's Railway

divide and conquer, graphs, trees

Optimizations From Chelsu

divide and conquer, dp, number theory, trees

Rap God

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

Red Blue Tree

data structures, implementation, trees

Lost Nodes

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

Restore the Tree

graphs, greedy, trees

Alphabetic Tree

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

Strange device

binary search, interactive, math, trees

Build Railway Stations

*special problem, greedy, trees

New Year Running

number theory, trees

Moonwalk challenge

data structures, strings, trees

Thanos Snap

binary search, dp, games, greedy, trees

Trains and Airplanes

dfs and similar, graphs, shortest paths, trees

Tree LGM

constructive algorithms, divide and conquer, games, trees

Escaping on Beaveractor

data structures, implementation, trees

Tree and Table

dfs and similar, dp, implementation, trees

Poachers

dp, games, graphs, trees

Sloth

dfs and similar, dp, graph matchings, trees

ELCA

data structures, trees

Tree and Permutation Game

dfs and similar, games, graphs, trees

Imitating the Key Tree

combinatorics, dsu, trees

Iqea

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

Baldman and the military

dfs and similar, graphs, trees

Cactus to Tree

dp, graphs, trees

Euler tour

constructive algorithms, trees

Journey

data structures, divide and conquer, graphs, trees

Star Trek

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

Modernization of Treeland

*special problem, dfs and similar, trees

MEX Tree Manipulation

data structures, trees

Harry Vs Voldemort

dfs and similar, dp, graphs, trees

Two Rooted Trees

data structures, implementation, trees

Evidence Board

*special problem, constructive algorithms, dfs and similar, graphs, trees

Tree

fft, graphs, trees

Prefix Max Set Counting

data structures, dp, trees

Diverse Coloring

constructive algorithms, trees

Ball-Stackable

constructive algorithms, data structures, dp, trees

Cheat and Win

bitmasks, data structures, games, trees

Ember and Storm's Tree Game

combinatorics, dp, games, trees

Communism

bitmasks, dp, trees

Island Puzzle

dfs and similar, dsu, graphs, trees

Problem of offices

constructive algorithms, dfs and similar, dp, trees

Roads in E City

interactive, math, probabilities, trees

Flower-like Pseudotree

constructive algorithms, graphs, greedy, implementation, trees

Two Subtrees

data structures, trees

Galaxy Union

dp, trees, two pointers

Santa's Gift

data structures, trees

Furukawa Nagisa's Tree

binary search, divide and conquer, sortings, trees

Mashtali vs AtCoder

games, trees

Ants

2-sat, data structures, trees

Range Diameter Sum

data structures, trees

Send Tree to Charlie

combinatorics, dfs and similar, dsu, trees

Train Tracks

data structures, trees

My Beautiful Madness

data structures, trees

Perpetual Motion Machine

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

Iron Man

data structures, geometry, trees

Squares

constructive algorithms, data structures, dp, graphs, trees

Send the Fool Further! (hard)

dfs and similar, dp, math, trees

Sasha and Algorithm of Silence's Sounds

data structures, trees

Permutation for Burenka

data structures, graph matchings, greedy, math, trees

Madness

constructive algorithms, dfs and similar, trees

Alien DNA

data structures, dsu, trees

Amanda the Amoeba

graphs, implementation, trees, two pointers

Beautiful Tree

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

Boring Card Game

data structures, greedy, trees

Triameter

binary search, data structures, dfs and similar, trees

Eye-Pleasing City Park Tour

data structures, trees

Perfect Matching

data structures, divide and conquer, interactive, trees

Johnny and James

greedy, implementation, math, trees

New Year and Social Network

data structures, graph matchings, graphs, math, trees

Tree or not Tree

data structures, divide and conquer, implementation, trees

Omkar and Tours

data structures, divide and conquer, sortings, trees

Last chance

data structures, flows, graph matchings, graphs, trees

Berland SU Computer Network

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

Distance Matching

constructive algorithms, dfs and similar, trees