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

Raining season

data structures, divide and conquer, trees

Distance Matching

constructive algorithms, dfs and similar, trees

Boring Card Game

data structures, greedy, trees

New Year and Social Network

data structures, graph matchings, graphs, math, trees

Triameter

binary search, data structures, dfs and similar, trees

Sasha and Algorithm of Silence's Sounds

data structures, trees

Ants

2-sat, data structures, trees

Roads in E City

interactive, math, probabilities, trees

Diverse Coloring

constructive algorithms, trees

Thanos Snap

binary search, dp, games, greedy, trees

ELCA

data structures, trees

New Year Running

number theory, trees

Verifying Kingdom

binary search, divide and conquer, interactive, trees

An easy problem about trees

dp, games, greedy, trees

Public Service

constructive algorithms, graphs, trees

Tree of Life (hard)

trees

Spiders Evil Plan

greedy, trees

Cow and Vacation

dfs and similar, dsu, trees

Bear and Chemistry

data structures, dfs and similar, graphs, trees

Omkar and Tours

data structures, divide and conquer, sortings, trees

Permutation for Burenka

data structures, graph matchings, greedy, math, trees

Squares

constructive algorithms, data structures, dp, graphs, trees

Iron Man

data structures, geometry, trees

Send Tree to Charlie

combinatorics, dfs and similar, dsu, trees

Ball-Stackable

constructive algorithms, data structures, dp, trees

MEX Tree Manipulation

data structures, trees

Harry Vs Voldemort

dfs and similar, dp, graphs, trees

Interactive Mex Tree

constructive algorithms, dfs and similar, interactive, trees

Yuezheng Ling and Dynamic Tree

data structures, trees

Niyaz and Small Degrees

data structures, dp, trees

Can Bash Save the Day?

data structures, divide and conquer, graphs, trees

Matches Are Not a Child's Play

data structures, trees

Exam

data structures, string suffix structures, trees

Recover the Tree

constructive algorithms, trees

Bus Routes

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

Island Puzzle

dfs and similar, dsu, graphs, trees

Ember and Storm's Tree Game

combinatorics, dp, games, trees

Tree

fft, graphs, trees

Iqea

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

Strange device

binary search, interactive, math, trees

Rap God

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

Upside Down

data structures, string suffix structures, strings, trees

Pisces

data structures, flows, trees

My Beautiful Madness

data structures, trees

Range Diameter Sum

data structures, trees

Communism

bitmasks, dp, trees

Cheat and Win

bitmasks, data structures, games, trees

Journey

data structures, divide and conquer, graphs, trees

Euler tour

constructive algorithms, trees

Tree LGM

constructive algorithms, divide and conquer, games, trees

Trains and Airplanes

dfs and similar, graphs, shortest paths, trees

Alphabetic Tree

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

Lost Nodes

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

Red Blue Tree

data structures, implementation, trees

Optimizations From Chelsu

divide and conquer, dp, number theory, trees

Finding the Vertex

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

Dušan's Railway

divide and conquer, graphs, trees

LuoTianyi and Cartridge

data structures, trees

Clubstep

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

Centroid Guess

interactive, probabilities, trees

Assigning Fares

dp, trees

Doremy's Swapping Trees

dfs and similar, graphs, trees

Standard Graph Problem

data structures, graphs, greedy, trees

Goldberg Machine 3

dp, trees

Spiderweb Trees

dp, geometry, trees

Redundant Routes

constructive algorithms, dp, trees

Doremy's Average Tree

data structures, dp, greedy, trees

Farmer John's Favorite Intern

data structures, dp, flows, trees