Doremy's Experimental Tree

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

Double Sort II

dfs and similar, flows, graph matchings, graphs

K-Set Tree

combinatorics, dfs and similar, dp, math, trees

Madoka and the Sixth-graders

data structures, dfs and similar, greedy

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

Roads in the Kingdom

dfs and similar, dp, graphs, trees

Swap and Maximum Block

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

Add on a Tree: Revolution

constructive algorithms, dfs and similar, implementation, trees

Middle Duplication

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

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

Almost Fault-Tolerant Database

brute force, constructive algorithms, dfs and similar, greedy, implementation

Falling Sand (Easy Version)

dfs and similar, graphs, greedy

Move and Swap

dfs and similar, dp, greedy, trees

Tenzing and Tree

dfs and similar, greedy, shortest paths, sortings, trees

LuoTianyi and XOR-Tree

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

Rollbacks (Easy Version)

brute force, data structures, dfs and similar, trees

Expected diameter of a tree

binary search, brute force, dfs and similar, dp, sortings, trees

Power Tree

dfs and similar, dp, dsu, graphs, greedy, trees

Distinctive Roots in a Tree

data structures, dfs and similar, dp, trees

Johnny and Megan's Necklace

binary search, bitmasks, constructive algorithms, dfs and similar, dsu, graphs

Complete the MST

bitmasks, brute force, data structures, dfs and similar, dsu, graphs, greedy, trees

Team-Building

data structures, dfs and similar, dsu, graphs

Egor in the Republic of Dagestan

constructive algorithms, dfs and similar, dp, graphs, greedy, shortest paths

Ehab's Last Theorem

constructive algorithms, dfs and similar, graphs, greedy

Towers

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

Nastia Plays with a Tree

constructive algorithms, data structures, dfs and similar, dp, dsu, greedy, implementation, trees

AND Graph

bitmasks, dfs and similar, dsu, graphs

Mocha and Diana (Hard Version)

brute force, constructive algorithms, dfs and similar, dsu, graphs, greedy, trees, two pointers

Tanya and Password

dfs and similar, graphs

Escaping on Beaveractor

dfs and similar, implementation

Send the Fool Further! (hard)

dfs and similar, dp, math, trees

Berland SU Computer Network

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

Cactusophobia

dfs and similar, flows

Constrained Tree

dfs and similar

Neatness

constructive algorithms, dfs and similar

Sereja and Sets

bitmasks, dfs and similar

Polo the Penguin and Trees

combinatorics, dfs and similar, trees

Palindrome XOR

dfs and similar, graphs

Vus the Cossack and a Graph

dfs and similar, graphs, greedy, implementation

Labelling Cities

dfs and similar, graphs, hashing

Complete Mirror

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

One-X

combinatorics, dfs and similar, dp, math, trees

Economic Difficulties

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

Construct a tree

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

Flow Control

dfs and similar, dp, greedy, trees

Trees and XOR Queries Again

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

Cookies

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

Neko and Flashback

constructive algorithms, dfs and similar, graphs

Maximum Matching

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

The Cake Is a Lie

constructive algorithms, data structures, dfs and similar, graphs

Frequency Queries

data structures, dfs and similar, trees

Little Elephant and Tree

data structures, dfs and similar, trees

Blocking Chips

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

Jellyfish and Math

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

Acyclic Organic Compounds

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

Distance Tree (easy version)

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

Bear and Square Grid

dfs and similar, dsu, implementation

Decreasing Game

constructive algorithms, dfs and similar, dp, greedy, interactive

Interactive Game with Coloring

brute force, constructive algorithms, dfs and similar, graphs, implementation, interactive, trees

Happy Tree Party

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

Simple Cycles Edges

dfs and similar, graphs, trees

Leaf Sets

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

Diameter Cuts

combinatorics, dfs and similar, dp, trees

Fast Travel Text Editor

data structures, dfs and similar, graphs, shortest paths

Koxia and Tree

combinatorics, dfs and similar, dp, dsu, math, probabilities, trees

Divisors and Table

brute force, dfs and similar, dp, number theory

The Hidden Pair (Easy Version)

binary search, dfs and similar, graphs, interactive, shortest paths, trees

Routing

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

Bear and Forgotten Tree 2

dfs and similar, dsu, graphs, trees

DFS Trees

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

Purple Crayon

data structures, dfs and similar, games, graphs, greedy, math, sortings, trees

Plan of Lectures

constructive algorithms, dfs and similar, dsu, graphs, implementation, sortings, trees

Spanning Tree Queries

binary search, data structures, dfs and similar, dsu, graphs, greedy, math, sortings, trees

Sum Balance

bitmasks, dfs and similar, dp, graphs

Prime Gift

binary search, dfs and similar, math, meet-in-the-middle, number theory, two pointers

Session in BSU

binary search, dfs and similar, dsu, graph matchings, graphs

Black and White Tree

dfs and similar, greedy, trees

Prefix Enlightenment

dfs and similar, dsu, graphs

Tree Destruction

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

Graph Transpositions

dfs and similar, graphs, greedy, shortest paths

Cactus Wall

constructive algorithms, dfs and similar, graphs, shortest paths

Fair Share

constructive algorithms, data structures, dfs and similar, graph matchings, graphs

The Beach

constructive algorithms, dfs and similar, graphs, shortest paths

Great Grids

2-sat, constructive algorithms, dfs and similar, dsu, graphs

Fedor and Essay

dfs and similar, dp, graphs, hashing, strings

MEX Tree

combinatorics, dfs and similar, implementation, math, trees

Catowice City

2-sat, dfs and similar, graph matchings, graphs

DeadLee

data structures, dfs and similar, greedy, implementation, sortings

Mr. Kitayuta's Colorful Graph

brute force, dfs and similar, dsu, graphs

Nastya and Unexpected Guest

dfs and similar, dp, graphs, shortest paths

Fib-tree

brute force, dfs and similar, divide and conquer, number theory, trees

XOR Tree

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

Blood Cousins Return

binary search, data structures, dfs and similar, dp, sortings

Tree and Queries

data structures, dfs and similar, trees

Wormhouse

dfs and similar, graphs

Spring cleaning

*special problem, data structures, dfs and similar, graphs, trees

Rats

brute force, dfs and similar, graphs, implementation, shortest paths