XOR, Tree, and Queries

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

Autocompletion

data structures, dfs and similar, dp

Preorder Test

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

Village (Maximum)

*special problem, dfs and similar, trees

General Mobilization

data structures, dfs and similar, sortings

Nastya and Time Machine

constructive algorithms, dfs and similar, graphs, trees

Complete Mirror

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

Off by One

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

Lexichromatography

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

Tree Queries

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

The Tree Has Fallen!

bitmasks, dfs and similar, math, trees

Nested Rubber Bands

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

Christmas Chocolates

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

Economic Difficulties

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

Путь Робота

constructive algorithms, dfs and similar, graphs

Tree

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

Game on Tree (Medium)

dfs and similar, dp, games, trees

Beautiful Road

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

Tree Recovery

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

Christmas Game

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

One-X

combinatorics, dfs and similar, dp, math, trees

Chemistry in Berland

dfs and similar, greedy, trees

The Boss's Identity

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

Peterson Polyglot

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

Mobile Phone Network

dfs and similar, dsu, graphs, trees

Turtle Magic: Royal Turtle Shell Pattern

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

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

Matching Names

dfs and similar, strings, trees

Flow Control

dfs and similar, dp, greedy, trees

Misha and LCP on Tree

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

One-Based Arithmetic

brute force, dfs and similar, divide and conquer

Trees and XOR Queries Again

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

Fools and Foolproof Roads

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

Daleks' Invasion (medium)

dfs and similar, graphs, shortest paths, trees

The Chocolate Spree

dfs and similar, dp, graphs, trees

K-Set Tree

combinatorics, dfs and similar, dp, 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

Snake

bitmasks, dfs and similar, graphs, implementation

Doremy's Experimental Tree

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

Cycling City

dfs and similar, graphs

Mathematician Takeover

binary search, dfs and similar, math

Distance Tree (hard version)

binary search, dfs and similar, shortest paths, trees

Phoenix and Odometers

dfs and similar, graphs, math, number theory

Neko and Flashback

constructive algorithms, dfs and similar, graphs

Chessboard Billiard

dfs and similar, dsu, graphs, number theory

Maximum Matching

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

Bear and Drawing

constructive algorithms, dfs and similar, trees

Madoka and the Sixth-graders

data structures, dfs and similar, greedy

Antennas

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

Double Sort II

dfs and similar, flows, graph matchings, graphs

Indie Album

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

Famil Door and Roads

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

Independent Set

dfs and similar, dp, trees

Variable, or There and Back Again

dfs and similar, graphs

Beavermuncher-0xFF

dfs and similar, dp, dsu, greedy, trees

Game of Pairs

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

Graph Traveler

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

Interestring graph and Apples

dfs and similar, dsu, graphs

Chocolate

dfs and similar, implementation

The Cake Is a Lie

constructive algorithms, data structures, dfs and similar, graphs

Roads in the Kingdom

dfs and similar, dp, graphs, trees

Dynamic Diameter

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

Bulmart

binary search, dfs and similar

Lovely Matrix

dfs and similar, graphs, greedy, sortings

Capitalism

constructive algorithms, dfs and similar, graphs, shortest paths

Frequency Queries

data structures, dfs and similar, trees

World Eater Brothers

dfs and similar, dp, greedy, trees

Swap and Maximum Block

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

Archaeology

data structures, dfs and similar, trees

Little Elephant and Tree

data structures, dfs and similar, trees

Bribes

dfs and similar, graphs, trees

Blocking Chips

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

Circle of Numbers

brute force, dfs and similar, implementation

Tokens on Graph

constructive algorithms, dfs and similar, graphs, shortest paths

Best Edge Weight

data structures, dfs and similar, graphs, trees

Jellyfish and Math

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

Middle Duplication

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

Frog Jumping

dfs and similar, math, number theory

Koala and Notebook

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

Acyclic Organic Compounds

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

Super Jaber

dfs and similar, graphs, implementation, shortest paths

Valera and Fools

dfs and similar, dp, graphs, shortest paths

wxhtzdy ORO Tree

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

Distance Tree (easy version)

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

Disks

dfs and similar, geometry, graph matchings, graphs

Add on a Tree: Revolution

constructive algorithms, dfs and similar, implementation, trees

Hill Climbing

dfs and similar, geometry, trees

Bipartite Segments

binary search, data structures, dfs and similar, dsu, graphs, two pointers

Bear and Square Grid

dfs and similar, dsu, implementation

Up and Down the Tree

dfs and similar, dp, trees

Tree Queries

dfs and similar, graphs, trees

ANDfinity

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

City Union

constructive algorithms, dfs and similar, dsu, geometry, greedy, implementation, math