Gift

dsu, graphs, sortings, trees

Counter Attack

data structures, dsu, graphs, hashing, sortings

st-Spanning Tree

dsu, graphs, greedy, implementation

Complete the MST

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

DFS Trees

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

New Year Domino

data structures, dp, dsu

Lucky Country

dp, dsu, graphs

Johnny and Megan's Necklace

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

Bear and Forgotten Tree 2

dfs and similar, dsu, graphs, trees

Sanae and Giant Robot

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

Columns Swaps

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

Black and White Tree

constructive algorithms, dsu, graphs, greedy, trees

Network Safety

dfs and similar, dsu, graphs, math, sortings

Koxia and Tree

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

Weak Memory

dfs and similar, dsu

Forbidden Indices

dsu, string suffix structures, strings

Petya and Spiders

bitmasks, dp, dsu

Dima and Trap Graph

binary search, data structures, dfs and similar, dsu, shortest paths, two pointers

Power Tree

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

LuoTianyi and XOR-Tree

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

Royal Questions

dsu, graphs, greedy

Leaf Sets

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

Drazil and Morning Exercise

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

Bipartite Checking

data structures, dsu, graphs

Li Hua and Array

brute force, data structures, dsu, math, number theory, two pointers

Pastoral Oddities

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

City Union

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

Connectivity Addicts

constructive algorithms, dsu, graphs, greedy, interactive, shortest paths, trees

ANDfinity

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

Fancy Fence

*special problem, data structures, dsu, implementation, math, sortings

Bipartite Segments

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

Bear and Square Grid

dfs and similar, dsu, implementation

Extending Set of Points

data structures, divide and conquer, dsu

Acyclic Organic Compounds

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

Drivers Dissatisfaction

data structures, dsu, graphs, trees

Valera and Swaps

constructive algorithms, dsu, graphs, implementation, math, string suffix structures

Labyrinth

binary search, dsu, greedy

Three strings

data structures, dsu, string suffix structures, strings

Nanami's Digital Board

dsu, implementation

Vasya and Maximum Profit

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

Interestring graph and Apples

dfs and similar, dsu, graphs

Beavermuncher-0xFF

dfs and similar, dp, dsu, greedy, trees

Common Divisor Graph

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

Points, Lines and Ready-made Titles

dfs and similar, dsu, graphs, trees

Deduction Queries

data structures, dsu

Chessboard Billiard

dfs and similar, dsu, graphs, number theory

Kuroni and Antihype

bitmasks, brute force, dp, dsu, graphs

Clusterization Counting

combinatorics, dp, dsu, fft, graphs, trees

Doremy's Experimental Tree

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

Guard Towers

binary search, dsu, geometry, graphs, sortings

Narrow Components

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

Mercenaries

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

Fools and Foolproof Roads

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

Smooth Sailing (Easy Version)

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

Peterson Polyglot

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

Mobile Phone Network

dfs and similar, dsu, graphs, trees

Ski Base

combinatorics, dsu, graphs

Shortest Path Queries

bitmasks, data structures, dsu, graphs

Dividing Kingdom II

brute force, data structures, dsu, graphs, sortings

DSU Master

combinatorics, dp, dsu, math

Tree Recovery

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

Beautiful Road

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

Vladik and Entertaining Flags

data structures, dsu, graphs

Opening Portals

dsu, graphs, shortest paths

Groceries in Meteor Town

binary search, data structures, dsu, trees

Good Graph

data structures, dsu, graphs, trees

Clearing Up

constructive algorithms, dp, dsu, graphs

Split

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

Lexichromatography

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

XOR, Tree, and Queries

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

Tick, Tock

combinatorics, dfs and similar, dsu, graphs

The Red Button

combinatorics, dfs and similar, dsu, graphs, greedy

DZY Loves Planting

binary search, dsu, trees

One-Four Overload

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

Trails and Glades

constructive algorithms, dsu, graphs, greedy

Building Forest

data structures, dsu, graphs

Vicky's Delivery Service

data structures, dsu, graphs, hashing

Delicious Dessert

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

Binary Matrix

dsu

Access Levels

bitmasks, dsu, flows, graph matchings

Campus

binary search, data structures, dsu, trees

Alice and the Unfair Game

binary search, data structures, dp, dsu

Lenient Vertex Cover

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

Jumping Around

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

MST with Matching

bitmasks, brute force, dsu, graph matchings, trees

Occurrences

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

Clockwork Bomb

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

Kingdom of Criticism

data structures, dsu

Cow and Vacation

dfs and similar, dsu, trees

Cute number

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

Words on Tree

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

Forced Online Queries Problem

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

Ilya and Two Numbers

constructive algorithms, data structures, dsu, greedy

Number of Components

dsu, implementation

Virus

data structures, divide and conquer, dsu, graphs

Two Paths

constructive algorithms, dsu, graphs, implementation

Daleks' Invasion (hard)

data structures, dsu, graphs, trees

...Wait for it...

data structures, dsu, trees

Reclamation

dsu

Timofey and our friends animals

data structures, divide and conquer, dsu