Distance Tree (easy version)

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

Valera and Fools

dfs and similar, dp, graphs, shortest paths

Annual Ants' Gathering

dfs and similar, dp, greedy, trees

Middle Duplication

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

Koala and Notebook

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

Add on a Tree: Revolution

constructive algorithms, dfs and similar, implementation, trees

Frog Jumping

dfs and similar, math, number theory

Jellyfish and Math

bitmasks, brute force, dfs and similar, dp, graphs, shortest paths

Best Edge Weight

data structures, dfs and similar, graphs, trees

Disks

dfs and similar, geometry, graph matchings, graphs

Circle of Numbers

brute force, dfs and similar, implementation

Blocking Chips

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

Tokens on Graph

constructive algorithms, dfs and similar, graphs, shortest paths

Bribes

dfs and similar, graphs, trees

Super Jaber

dfs and similar, graphs, implementation, shortest paths

Little Elephant and Tree

data structures, dfs and similar, trees

Swap and Maximum Block

bitmasks, data structures, dfs and similar, divide and conquer, dp

Archaeology

data structures, dfs and similar, trees

World Eater Brothers

dfs and similar, dp, greedy, trees

Capitalism

constructive algorithms, dfs and similar, graphs, shortest paths

Frequency Queries

data structures, dfs and similar, trees

Lovely Matrix

dfs and similar, graphs, greedy, sortings

Bulmart

binary search, dfs and similar

Dynamic Diameter

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

The Cake Is a Lie

constructive algorithms, data structures, dfs and similar, graphs

Roads in the Kingdom

dfs and similar, dp, graphs, trees

Chocolate

dfs and similar, implementation

Interestring graph and Apples

dfs and similar, dsu, graphs

Game of Pairs

constructive algorithms, dfs and similar, interactive, math, number theory

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

Variable, or There and Back Again

dfs and similar, graphs

Famil Door and Roads

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

Antennas

data structures, dfs and similar, graphs, graphs, implementation, implementation, shortest paths, shortest paths

Madoka and the Sixth-graders

data structures, dfs and similar, greedy

Bear and Drawing

constructive algorithms, dfs and similar, trees

Maximum Matching

bitmasks, brute force, dfs and similar, dp, graphs

Indie Album

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

Chessboard Billiard

dfs and similar, dsu, graphs, number theory

Neko and Flashback

constructive algorithms, dfs and similar, graphs

Phoenix and Odometers

dfs and similar, graphs, math, number theory

Distance Tree (hard version)

binary search, dfs and similar, shortest paths, trees

Cycling City

dfs and similar, graphs

Snake

bitmasks, dfs and similar, graphs, implementation

Graph Traveler

brute force, data structures, dfs and similar, dp, graphs, implementation, math, number theory

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

Double Sort II

dfs and similar, flows, graph matchings, graphs

Mathematician Takeover

binary search, dfs and similar, math

Daleks' Invasion (medium)

dfs and similar, graphs, shortest paths, trees

The Chocolate Spree

dfs and similar, dp, graphs, trees

Fools and Foolproof Roads

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

Trees and XOR Queries Again

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

One-Based Arithmetic

brute force, dfs and similar, divide and conquer

Doremy's Experimental Tree

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

Flow Control

dfs and similar, dp, greedy, trees

Matching Names

dfs and similar, strings, trees

Lucky Number Representation

constructive algorithms, dfs and similar, dp

Smooth Sailing (Easy Version)

binary search, brute force, data structures, dfs and similar, dsu, graphs, shortest paths

Misha and LCP on Tree

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

Construct a tree

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

Fafa and Ancient Mathematics

dfs and similar, dp, trees

Run for beer

dfs and similar, shortest paths

Mobile Phone Network

dfs and similar, dsu, graphs, trees

Peterson Polyglot

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

Turtle Magic: Royal Turtle Shell Pattern

bitmasks, brute force, combinatorics, constructive algorithms, dfs and similar, math

The Boss's Identity

binary search, bitmasks, data structures, dfs and similar, greedy, math, sortings

Chemistry in Berland

dfs and similar, greedy, trees

Christmas Game

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

Beautiful Road

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

Tree Recovery

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

One-X

combinatorics, dfs and similar, dp, math, trees

Tree

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

Путь Робота

constructive algorithms, dfs and similar, graphs

Economic Difficulties

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

Christmas Chocolates

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

The Tree Has Fallen!

bitmasks, dfs and similar, math, trees

Lexichromatography

combinatorics, dfs and similar, dsu, graphs, two pointers

Tree Queries

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

Complete Mirror

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

Off by One

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

Nested Rubber Bands

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

General Mobilization

data structures, dfs and similar, sortings

Nastya and Time Machine

constructive algorithms, dfs and similar, graphs, trees

Preorder Test

binary search, dfs and similar, dp, graphs, greedy, trees

Village (Maximum)

*special problem, dfs and similar, trees

Board Game

data structures, dfs and similar

XOR, Tree, and Queries

bitmasks, constructive algorithms, dfs and similar, dsu, graphs, greedy, implementation, trees

Johnny Solving

constructive algorithms, dfs and similar, graphs, math

Tick, Tock

combinatorics, dfs and similar, dsu, graphs

Phoenix and Memory

data structures, dfs and similar, graphs, greedy

Road Projects

dfs and similar, dp, trees

x-prime Substrings

brute force, dfs and similar, dp, string suffix structures, strings

Checker for Array Shuffling

constructive algorithms, dfs and similar, graphs

Caterpillar on a Tree

dfs and similar, graphs, greedy, implementation, sortings, trees