Hill Climbing

dfs and similar, geometry, trees

Tree Queries

data structures, probabilities, trees

Cowmpany Cowmpensation

combinatorics, dp, math, trees

Distance Tree (easy version)

binary search, data structures, dfs and similar, graphs, shortest paths, trees

Ralph And His Tour in Binary Country

brute force, data structures, trees

Drivers Dissatisfaction

data structures, dsu, graphs, trees

Leaf Partition

dp, trees

wxhtzdy ORO Tree

binary search, bitmasks, brute force, data structures, dfs and similar, implementation, trees

Acyclic Organic Compounds

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

Middle Duplication

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

Add on a Tree: Revolution

constructive algorithms, dfs and similar, implementation, trees

Koala and Notebook

data structures, dfs and similar, graphs, shortest paths, strings, trees

Travel Plan

combinatorics, dp, implementation, math, trees

Best Edge Weight

data structures, dfs and similar, graphs, trees

Annual Ants' Gathering

dfs and similar, dp, greedy, trees

Ann and Half-Palindrome

data structures, dp, graphs, string suffix structures, strings, trees

Blocking Chips

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

Bribes

dfs and similar, graphs, trees

Little Elephant and Tree

data structures, dfs and similar, trees

World Eater Brothers

dfs and similar, dp, greedy, trees

Sagheer and Apple Tree

games, trees

Magic Matrix

brute force, divide and conquer, graphs, matrices, trees

Archaeology

data structures, dfs and similar, trees

Sonya and Ice Cream

binary search, data structures, dp, greedy, shortest paths, trees

Frequency Queries

data structures, dfs and similar, trees

Divisor Tree

brute force, number theory, trees

Labeling the Tree with Distances

data structures, dp, greedy, hashing, implementation, trees

Rollbacks (Hard Version)

data structures, interactive, trees

Stranger Trees

dp, math, matrices, trees

Xor-matic Number of the Graph

bitmasks, graphs, math, number theory, trees

Dynamic Diameter

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

Roads in the Kingdom

dfs and similar, dp, graphs, trees

Beavermuncher-0xFF

dfs and similar, dp, dsu, greedy, trees

Independent Set

dfs and similar, dp, trees

Points, Lines and Ready-made Titles

dfs and similar, dsu, graphs, trees

Cats on the Upgrade (easy version)

brute force, data structures, dfs and similar, divide and conquer, dp, graphs, trees

Famil Door and Roads

combinatorics, data structures, dfs and similar, dp, probabilities, trees

Mathematics Curriculum

brute force, combinatorics, dp, trees

Bear and Drawing

constructive algorithms, dfs and similar, trees

Hossam and Range Minimum Query

binary search, bitmasks, data structures, hashing, probabilities, strings, trees

Greedy Subsequences

data structures, dp, trees

Adam and Tree

data structures, trees

Odd Mineral Resource

binary search, bitmasks, brute force, data structures, probabilities, trees

Indie Album

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

Death DBMS

data structures, string suffix structures, strings, trees

Fox And Travelling

dp, trees

Distance Tree (hard version)

binary search, dfs and similar, shortest paths, trees

Clusterization Counting

combinatorics, dp, dsu, fft, graphs, trees

Miss Punyverse

dp, greedy, trees

Narrow Components

brute force, data structures, dp, dsu, math, trees

Cookies

binary search, data structures, dfs and similar, dp, games, trees

Choosing Subtree is Fun

binary search, data structures, dfs and similar, trees, two pointers

K-Set Tree

combinatorics, dfs and similar, dp, math, trees

Guess the Tree

bitmasks, constructive algorithms, dp, greedy, trees

The Chocolate Spree

dfs and similar, dp, graphs, trees

Daleks' Invasion (medium)

dfs and similar, graphs, shortest paths, trees

Vasya and Maximum Matching

dp, trees

Shaass the Great

dp, trees

Construct Tree

bitmasks, constructive algorithms, dp, trees

Brain Network (hard)

trees

Doremy's Experimental Tree

brute force, constructive algorithms, dfs and similar, dsu, sortings, trees

Trees and XOR Queries Again

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

Flow Control

dfs and similar, dp, greedy, trees

Matching Names

dfs and similar, strings, trees

Regular Forestation

hashing, trees

NN country

binary search, data structures, trees

Construct a tree

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

Tree Factory

constructive algorithms, greedy, trees

Fafa and Ancient Mathematics

dfs and similar, dp, trees

Mobile Phone Network

dfs and similar, dsu, graphs, trees

Misha and LCP on Tree

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

Progress Monitoring

dp, trees

Chemistry in Berland

dfs and similar, greedy, trees

Third Month Insanity

dp, probabilities, trees

Peterson Polyglot

brute force, dfs and similar, dsu, hashing, strings, trees

Region Separation

combinatorics, dp, number theory, trees

Beautiful Road

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

Inna and Sequence

binary search, data structures, dp, trees

Ostap and Tree

dp, trees

Zublicanes and Mumocrates

dp, trees, two pointers

Tree

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

Christmas Game

bitmasks, data structures, dfs and similar, dp, games, math, trees

Tree Recovery

brute force, constructive algorithms, dfs and similar, dsu, graphs, trees

Max Mex

data structures, trees

Illusions of the Desert

data structures, trees

Economic Difficulties

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

One-X

combinatorics, dfs and similar, dp, math, trees

Christmas Chocolates

dfs and similar, dp, games, graphs, implementation, math, number theory, shortest paths, trees

Good Graph

data structures, dsu, graphs, trees

Algebra Flash

bitmasks, brute force, dp, graphs, math, meet-in-the-middle, trees

Groceries in Meteor Town

binary search, data structures, dsu, trees

The Tree Has Fallen!

bitmasks, dfs and similar, math, trees

Comfortably Numb

bitmasks, data structures, divide and conquer, strings, trees

Thwarting Demonstrations

binary search, data structures, trees

Boboniu and Jianghu

dp, greedy, sortings, trees

Autocompletion

*special problem, strings, trees

Complete Mirror

constructive algorithms, dfs and similar, dp, hashing, implementation, trees

Off by One

constructive algorithms, dfs and similar, geometry, graphs, sortings, trees

Nastya and Time Machine

constructive algorithms, dfs and similar, graphs, trees

Split

binary search, data structures, divide and conquer, dsu, math, trees, two pointers