A Convex Game

dsu, games

Flow Control

data structures, dsu, implementation

New Year and Snowy Grid

dfs and similar, dsu, graphs, interactive

Kuroni and Antihype

bitmasks, brute force, dp, dsu, graphs

Iqea

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

Island Puzzle

dfs and similar, dsu, graphs, trees

Gates to Another World

bitmasks, data structures, dsu, two pointers

Send Tree to Charlie

combinatorics, dfs and similar, dsu, trees

Cow and Vacation

dfs and similar, dsu, trees

Air Reform

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

Clockwork Bomb

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

Dangerous Laser Power

constructive algorithms, dsu, sortings

Cycle sort

dsu, math

Campus

binary search, data structures, dsu, trees

Groceries in Meteor Town

binary search, data structures, dsu, trees

Welcome home, Chtholly

data structures, dsu

Li Hua and Path

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

Gasoline prices

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

Edge Queries

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

...Wait for it...

data structures, dsu, trees

Pastoral Oddities

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

Bakery

data structures, dsu

Distinctification

data structures, dsu, greedy

Timofey and our friends animals

data structures, divide and conquer, dsu

Reclamation

dsu

Cute number

binary search, brute force, data structures, dsu, implementation, math

Shortest Path Queries

bitmasks, data structures, dsu, graphs

Fairy

dfs and similar, divide and conquer, dsu

Visible Black Areas

data structures, dsu, geometry, trees

Imitating the Key Tree

combinatorics, dsu, trees

Alien DNA

data structures, dsu, trees

Building Forest Trails

data structures, dsu

Appleman and Complicated Task

dsu, math

Joker

*special problem, bitmasks, data structures, divide and conquer, dsu

Permutation Weight (Easy Version)

constructive algorithms, dfs and similar, dsu

Rain of Fire

binary search, data structures, dfs and similar, dsu, graphs, implementation

Number of Components

dsu, implementation

The Red Button

combinatorics, dfs and similar, dsu, graphs, greedy

Drazil and Morning Exercise

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

MUH and Lots and Lots of Segments

data structures, dsu

Entertaining Geodetics

brute force, dsu, implementation

Pairs

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

Communication Towers

brute force, divide and conquer, dsu

Jumping Around

binary search, data structures, divide and conquer, dp, dsu, graphs, shortest paths

Occurrences

combinatorics, dfs and similar, dp, dsu, fft, graphs

DZY Loves Planting

binary search, dsu, trees

One-Four Overload

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

Good Graph

data structures, dsu, graphs, trees

Clusterization Counting

combinatorics, dp, dsu, fft, graphs, trees

Common Divisor Graph

brute force, constructive algorithms, dsu, graphs, hashing, math, number theory

Digit Tree

dfs and similar, divide and conquer, dsu, trees

Holes

data structures, dsu

Inna and Babies

binary search, data structures, dsu, geometry, implementation

Two Paths

constructive algorithms, dsu, graphs, implementation

Lenient Vertex Cover

dfs and similar, divide and conquer, dsu, graphs, trees

Forced Online Queries Problem

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

Words on Tree

2-sat, dfs and similar, dsu, graphs, trees

Vladik and Entertaining Flags

data structures, dsu, graphs

Opening Portals

dsu, graphs, shortest paths

Tree Recovery

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

Mercenaries

bitmasks, brute force, combinatorics, dp, dsu, math, two pointers

Mobile Phone Network

dfs and similar, dsu, graphs, trees

Guard Towers

binary search, dsu, geometry, graphs, sortings

Extending Set of Points

data structures, divide and conquer, dsu

Phoenix and Earthquake

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

Graph and Queries

data structures, dsu, graphs, implementation, trees

Savior

brute force, dsu, math

Cutting a Fence

binary search, data structures, dsu

Virus

data structures, divide and conquer, dsu, graphs

Kingdom of Criticism

data structures, dsu

Alice and the Unfair Game

binary search, data structures, dp, dsu

Binary Matrix

dsu

XOR, Tree, and Queries

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

DSU Master

combinatorics, dp, dsu, math

Tick, Tock

combinatorics, dfs and similar, dsu, graphs

Doremy's Experimental Tree

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

Peterson Polyglot

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

Dividing Kingdom II

brute force, data structures, dsu, graphs, sortings

Narrow Components

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

LuoTianyi and XOR-Tree

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

Bipartite Checking

data structures, dsu, graphs

Power Tree

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

ANDfinity

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

Royal Questions

dsu, graphs, greedy

Lucky Country

dp, dsu, graphs

Complete the MST

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

Sanae and Giant Robot

binary search, brute force, data structures, dsu, greedy, sortings

Cheap Robot

binary search, dsu, graphs, shortest paths, trees

Team-Building

data structures, dfs and similar, dsu, graphs

Johnny and Megan's Necklace

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

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

Daleks' Invasion (hard)

data structures, dsu, graphs, trees

Delicious Dessert

binary search, dsu, hashing, math, number theory, string suffix structures

Access Levels

bitmasks, dsu, flows, graph matchings

Trails and Glades

constructive algorithms, dsu, graphs, greedy

Vicky's Delivery Service

data structures, dsu, graphs, hashing

Deduction Queries

data structures, dsu

Vasya and Maximum Profit

binary search, constructive algorithms, data structures, dp, dsu