Equal or Not Equal

constructive algorithms, dsu, implementation

Books Exchange (easy version)

dsu, math

The Lakes

dfs and similar, dsu, graphs, implementation

Misha and Changing Handles

data structures, dsu, strings

Ice Skating

brute force, dfs and similar, dsu, graphs

Hemose Shopping

constructive algorithms, dsu, math, sortings

Coloring a Tree

dfs and similar, dsu, greedy

Mahmoud and Ehab and the message

dsu, greedy, implementation

Find the Different Ones!

binary search, brute force, data structures, dp, dsu, greedy, two pointers

Books Exchange (hard version)

dfs and similar, dsu, math

Inversion Graph

data structures, dsu, graphs, math

Little Alawn's Puzzle

combinatorics, dp, dsu, graphs, math

Jatayu's Balanced Bracket Sequence

data structures, dsu, graphs, greedy

PolandBall and Forest

dfs and similar, dsu, graphs, interactive, trees

Drazil and His Happy Friends

brute force, dsu, meet-in-the-middle, number theory

Petya and Catacombs

dsu, greedy, implementation, trees

Alice and Hairdresser

dsu, implementation

Learning Languages

dfs and similar, dsu

News Distribution

dfs and similar, dsu, graphs

Mocha and Diana (Easy Version)

brute force, constructive algorithms, dsu, graphs, greedy, trees

NEKO's Maze Game

data structures, dsu, implementation

Unforgivable Curse (easy version)

brute force, constructive algorithms, dsu, graphs, greedy, strings

DZY Loves Chemistry

dfs and similar, dsu, greedy

Mr. Kitayuta's Colorful Graph

dfs and similar, dp, dsu, graphs

Heavy Intervals

constructive algorithms, data structures, dsu, greedy, math, sortings

Phase Shift

dfs and similar, dsu, graphs, greedy, implementation, strings

Where is the Pizza?

data structures, dfs and similar, dsu, graphs, implementation, math

Connect

brute force, dfs and similar, dsu

XOUR

data structures, dsu, sortings

Sorting by Subsequences

dfs and similar, dsu, implementation, math, sortings

Serial Time!

dfs and similar, dsu

Cyclic Components

dfs and similar, dsu, graphs

K-Complete Word

dfs and similar, dsu, greedy, implementation, strings

Bear and Friendship Condition

dfs and similar, dsu, graphs

Secret Passwords

dfs and similar, dsu, graphs

Knight Tournament

data structures, dsu

Unforgivable Curse (hard version)

brute force, constructive algorithms, dfs and similar, dsu, graphs, greedy, strings

Edgy Trees

dfs and similar, dsu, graphs, math, trees

Replace With the Previous, Minimize

dsu, greedy, strings

A + B Strikes Back

*special problem, brute force, constructive algorithms, dsu, implementation

Cthulhu

dfs and similar, dsu, graphs

Queue

dsu, implementation

Sorting the Coins

dsu, implementation, sortings, two pointers

Hierarchy

dfs and similar, dsu, greedy, shortest paths

Jeopardy of Dropped Balls

binary search, brute force, dsu, implementation

Party

dfs and similar, dsu, graphs

Party

brute force, dfs and similar, dsu, graphs

Split Into Two Sets

dfs and similar, dsu, graphs

Round Dance

dfs and similar, dsu, graphs, shortest paths

Timofey and a tree

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

Destroying Array

data structures, dsu

New Year Permutation

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

New Reform

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

Love Rescue

dfs and similar, dsu, graphs, greedy, strings

Social Network

dsu, graphs, greedy, implementation, trees

Lakes in Berland

dfs and similar, dsu, graphs, greedy, implementation

Socks

dfs and similar, dsu, graphs, greedy

Arpa's weak amphitheater and Mehrdad's valuable Hoses

dfs and similar, dp, dsu

pSort

dfs and similar, dsu, graphs

Solve The Maze

constructive algorithms, dfs and similar, dsu, graphs, greedy, implementation, shortest paths

Cover it!

dfs and similar, dsu, graphs, shortest paths, trees

String Transformation 1

dsu, graphs, greedy, sortings, strings, trees, two pointers

Harmonious Graph

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

Cow and Snacks

dfs and similar, dsu, graphs

Journey

dfs and similar, dp, dsu, implementation

Peaceful Rooks

dfs and similar, dsu, graphs

The Third Letter

dfs and similar, dsu, graphs, greedy, implementation

Boris and His Amazing Haircut

constructive algorithms, data structures, dp, dsu, greedy, sortings

The Number of Imposters

constructive algorithms, dfs and similar, dp, dsu, graphs

Mad City

dfs and similar, dsu, games, graphs, shortest paths, trees

Asya And Kittens

constructive algorithms, dsu

Fix a Tree

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

Swaps in Permutation

dfs and similar, dsu, math

Correct Bracket Sequence Editor

data structures, dsu, strings

Artsem and Saunders

constructive algorithms, dsu, math

Rating System

binary search, brute force, data structures, dp, dsu, greedy, math, two pointers

Path Queries

divide and conquer, dsu, graphs, sortings, trees

Andrey and Escape from Capygrad

binary search, data structures, dp, dsu, greedy, sortings

Selling a Menagerie

dfs and similar, dsu, graphs, implementation, math

Vessels

data structures, dsu, implementation, trees

Ksyusha and Chinchilla

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

Identify the Operations

combinatorics, data structures, dsu, greedy, implementation

Road Reform

dsu, graphs, greedy

Maximum Distance

dsu, graphs, shortest paths, sortings

Dungeons and Candies

dsu, graphs, greedy, trees

Moodular Arithmetic

combinatorics, dfs and similar, dsu, math, number theory

Fancy Fence

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

Roads not only in Berland

dsu, graphs, trees

Mike and Feet

binary search, data structures, dp, dsu

Replace the Numbers

constructive algorithms, data structures, dsu, implementation

0-1 MST

dfs and similar, dsu, graphs, sortings

Shichikuji and Power Grid

dsu, graphs, greedy, shortest paths, trees

Make It Connected

dsu, graphs, greedy

MinOr Tree

bitmasks, dfs and similar, dsu, graphs, greedy

Berserk Monsters

brute force, data structures, dsu, implementation, math

Array Repetition

binary search, brute force, dsu, implementation, math

Design Tutorial: Inverse the Problem

dfs and similar, dsu, shortest paths, trees

Two Fairs

combinatorics, dfs and similar, dsu, graphs

Imbalanced Array

data structures, divide and conquer, dsu, sortings

Microcycle

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