Farmer John's Favorite Intern

data structures, dp, flows, trees

Doremy's Average Tree

data structures, dp, greedy, trees

Redundant Routes

constructive algorithms, dp, trees

Spiderweb Trees

dp, geometry, trees

Goldberg Machine 3

dp, trees

Standard Graph Problem

data structures, graphs, greedy, trees

Doremy's Swapping Trees

dfs and similar, graphs, trees

Assigning Fares

dp, trees

Centroid Guess

interactive, probabilities, trees

Clubstep

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

LuoTianyi and Cartridge

data structures, 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

Red Blue Tree

data structures, implementation, trees

Lost Nodes

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

Alphabetic Tree

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

Trains and Airplanes

dfs and similar, graphs, shortest paths, trees

Tree LGM

constructive algorithms, divide and conquer, games, trees

Euler tour

constructive algorithms, trees

Journey

data structures, divide and conquer, graphs, trees

Cheat and Win

bitmasks, data structures, games, trees

Communism

bitmasks, dp, trees

Range Diameter Sum

data structures, trees

My Beautiful Madness

data structures, trees

Pisces

data structures, flows, trees

Upside Down

data structures, string suffix structures, strings, trees

Rap God

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

Strange device

binary search, interactive, math, trees

Iqea

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

Tree

fft, graphs, trees

Ember and Storm's Tree Game

combinatorics, dp, games, trees

Island Puzzle

dfs and similar, dsu, graphs, trees

Bus Routes

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

Recover the Tree

constructive algorithms, trees

Exam

data structures, string suffix structures, trees

Matches Are Not a Child's Play

data structures, trees

Can Bash Save the Day?

data structures, divide and conquer, graphs, trees

Niyaz and Small Degrees

data structures, dp, trees

Yuezheng Ling and Dynamic Tree

data structures, trees

Interactive Mex Tree

constructive algorithms, dfs and similar, interactive, trees

Harry Vs Voldemort

dfs and similar, dp, graphs, trees

MEX Tree Manipulation

data structures, trees

Ball-Stackable

constructive algorithms, data structures, dp, trees

Send Tree to Charlie

combinatorics, dfs and similar, dsu, trees

Iron Man

data structures, geometry, trees

Squares

constructive algorithms, data structures, dp, graphs, trees

Permutation for Burenka

data structures, graph matchings, greedy, math, trees

Omkar and Tours

data structures, divide and conquer, sortings, trees

Bear and Chemistry

data structures, dfs and similar, graphs, trees

Cow and Vacation

dfs and similar, dsu, trees

Spiders Evil Plan

greedy, trees

Tree of Life (hard)

trees

Public Service

constructive algorithms, graphs, trees

An easy problem about trees

dp, games, greedy, trees

Verifying Kingdom

binary search, divide and conquer, interactive, trees

New Year Running

number theory, trees

ELCA

data structures, trees

Thanos Snap

binary search, dp, games, greedy, trees

Diverse Coloring

constructive algorithms, trees

Roads in E City

interactive, math, probabilities, trees

Ants

2-sat, data structures, trees

Sasha and Algorithm of Silence's Sounds

data structures, trees

Triameter

binary search, data structures, dfs and similar, trees

Boring Card Game

data structures, greedy, trees

New Year and Social Network

data structures, graph matchings, graphs, math, trees

Distance Matching

constructive algorithms, dfs and similar, trees

Raining season

data structures, divide and conquer, trees

Segment Covering

brute force, combinatorics, constructive algorithms, data structures, dp, trees

Teleportation in Byteland

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

Air Reform

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

Shifting Dominoes

data structures, geometry, graphs, trees

In a Trap

trees

Reunion

combinatorics, dp, trees

Mirror Box

matrices, trees

Clockwork Bomb

data structures, dfs and similar, dsu, greedy, trees

Restoring Map

bitmasks, constructive algorithms, trees

ALT

data structures, flows, graphs, trees

Tourists

data structures, dfs and similar, graphs, trees

Road Repair in Treeland

*special problem, binary search, dp, trees

Sloth

dfs and similar, dp, graph matchings, trees

Two Subtrees

data structures, trees

Prefix Max Set Counting

data structures, dp, trees

Santa's Gift

data structures, trees

Mashtali vs AtCoder

games, trees

Train Tracks

data structures, trees

Perpetual Motion Machine

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

Tree Calendar

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

Tavas on the Path

data structures, divide and conquer, trees

Legendary Tree

binary search, interactive, trees

Squid Game

data structures, dfs and similar, greedy, trees

AB Tree

dp, greedy, trees

String Transformation 2

bitmasks, dp, graphs, trees

Tree-Tac-Toe

constructive algorithms, games, trees

MST with Matching

bitmasks, brute force, dsu, graph matchings, trees

Campus

binary search, data structures, dsu, trees

Surprise me!

divide and conquer, math, number theory, trees

Groceries in Meteor Town

binary search, data structures, dsu, trees

Archaeology

data structures, dfs and similar, trees

Tree and Table

dfs and similar, dp, implementation, trees