Red Blue Tree

data structures, implementation, trees

Euler tour

constructive algorithms, trees

Iron Man

data structures, geometry, trees

Tree

fft, graphs, trees

Island Puzzle

dfs and similar, dsu, graphs, trees

Mirror Box

matrices, trees

Pisces

data structures, flows, trees

Strange device

binary search, interactive, math, trees

Rap God

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

Iqea

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

Bear and Chemistry

data structures, dfs and similar, graphs, trees

Spiders Evil Plan

greedy, trees

Matches Are Not a Child's Play

data structures, trees

Tree of Life (hard)

trees

Verifying Kingdom

binary search, divide and conquer, interactive, trees

Ants

2-sat, data structures, trees

Send Tree to Charlie

combinatorics, dfs and similar, dsu, trees

ELCA

data structures, trees

Sasha and Algorithm of Silence's Sounds

data structures, trees

Raining season

data structures, divide and conquer, trees

Restoring Map

bitmasks, constructive algorithms, trees

In a Trap

trees

ALT

data structures, flows, graphs, trees

Perpetual Motion Machine

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

New Year and Social Network

data structures, graph matchings, graphs, math, trees

Tavas on the Path

data structures, divide and conquer, trees

Clockwork Bomb

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

Tourists

data structures, dfs and similar, graphs, trees

Road Repair in Treeland

*special problem, binary search, dp, trees

Upside Down

data structures, string suffix structures, strings, trees

Tree of Life (medium)

constructive algorithms, hashing, trees

An easy problem about trees

dp, games, greedy, trees

New Year Running

number theory, trees

Harry Vs Voldemort

dfs and similar, dp, graphs, trees

Sloth

dfs and similar, dp, graph matchings, trees

Moonwalk challenge

data structures, strings, trees

Tree and Table

dfs and similar, dp, implementation, trees

Santa's Gift

data structures, trees

Furukawa Nagisa's Tree

binary search, divide and conquer, sortings, trees

Nikita and game

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

Berland Miners

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

Legendary Tree

binary search, interactive, trees

Logistical Questions

dfs and similar, divide and conquer, trees

Campus

binary search, data structures, dsu, trees

Tree-Tac-Toe

constructive algorithms, games, trees

Misha and LCP on Tree

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

Ehab and a weird weight formula

data structures, trees

Freezing with Style

binary search, data structures, divide and conquer, trees

Surprise me!

divide and conquer, math, number theory, trees

Archaeology

data structures, dfs and similar, trees

Public Service

constructive algorithms, graphs, trees

Ember and Storm's Tree Game

combinatorics, dp, games, trees

Visible Black Areas

data structures, dsu, geometry, trees

Cactus to Tree

dp, graphs, trees

Tree nesting

combinatorics, graphs, trees

Find String in a Grid

data structures, dp, strings, trees

Escaping on Beaveractor

data structures, implementation, trees

Two Rooted Trees

data structures, implementation, trees

Anagram Paths

dp, implementation, trees

Double Tree

data structures, divide and conquer, shortest paths, trees

Niyaz and Small Degrees

data structures, dp, trees

May Holidays

data structures, trees

Speed Dial

dp, strings, trees

Vladislav and a Great Legend

combinatorics, dp, trees

Upgrading Tree

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

Andrew and Chemistry

dp, hashing, trees

...Wait for it...

data structures, dsu, trees

Pastoral Oddities

data structures, divide and conquer, dsu, math, trees

Broken Tree

dfs and similar, dp, graphs, greedy, trees

Noble Knight's Path

data structures, trees

Prince's Problem

brute force, data structures, math, number theory, trees

Fox And Travelling

dp, trees

Region Separation

combinatorics, dp, number theory, trees

Tree Generator™

data structures, implementation, trees

Restore the Tree

graphs, greedy, trees

Heaps

dp, trees

Send the Fool Further! (hard)

dfs and similar, dp, math, trees

Tree or not Tree

data structures, divide and conquer, implementation, trees

Problem of offices

constructive algorithms, dfs and similar, dp, trees

Last chance

data structures, flows, graph matchings, trees

Leaders

dfs and similar, dsu, graphs, trees

Random Forest Rank

dp, graph matchings, math, trees

Uniformly Branched Trees

combinatorics, dp, trees

Red-Black Cobweb

data structures, divide and conquer, implementation, trees

Two-Paths

data structures, dp, trees

Forced Online Queries Problem

data structures, divide and conquer, dsu, graphs, trees

Tree and XOR

strings, trees

Cycles in product

combinatorics, divide and conquer, trees

Timofey and a flat tree

data structures, graphs, hashing, shortest paths, trees

Pilgrims

dfs and similar, dp, trees

Choosing Two Paths

dfs and similar, dp, greedy, trees

Pumping Stations

brute force, dfs and similar, divide and conquer, flows, graphs, greedy, trees

Dasha and cyclic table

bitmasks, brute force, fft, strings, trees

Singer House

combinatorics, dp, graphs, trees

Max Mex

data structures, trees

Almost All

constructive algorithms, trees

Tree

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

Drazil and Morning Exercise

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

Ostap and Tree

dp, trees

e-Government

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