Equal or Not Equal

constructive algorithms, dsu, implementation

Ice Skating

brute force, dfs and similar, dsu, graphs

Books Exchange (easy version)

dsu, math

Cyclic Components

dfs and similar, dsu, graphs

Find the Different Ones!

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

The Lakes

dfs and similar, dsu, graphs, implementation

Learning Languages

dfs and similar, dsu

News Distribution

dfs and similar, dsu, graphs

Books Exchange (hard version)

dfs and similar, dsu, math

Solve The Maze

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

K-Complete Word

dfs and similar, dsu, greedy, implementation, strings

Misha and Changing Handles

data structures, dsu, strings

Hemose Shopping

constructive algorithms, dsu, math, sortings

Bear and Friendship Condition

dfs and similar, dsu, graphs

Inversion Graph

data structures, dsu, graphs, math

Secret Passwords

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

Knight Tournament

data structures, dsu

Lomsat gelral

data structures, dfs and similar, dsu, trees

Little Alawn's Puzzle

combinatorics, dp, dsu, graphs, math

Split Into Two Sets

dfs and similar, dsu, graphs

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

Unforgivable Curse (hard version)

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

Jatayu's Balanced Bracket Sequence

data structures, dsu, graphs, greedy

Edgy Trees

dfs and similar, dsu, graphs, math, trees

PolandBall and Forest

dfs and similar, dsu, graphs, interactive, trees

Coloring a Tree

dfs and similar, dsu, greedy

Cover it!

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

Roads not only in Berland

dsu, graphs, trees

Round Dance

dfs and similar, dsu, graphs, shortest paths

String Transformation 1

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

Timofey and a tree

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

Replace With the Previous, Minimize

dsu, greedy, strings

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

Mahmoud and Ehab and the message

dsu, greedy, implementation

Odd-Even Subsequence

binary search, dp, dsu, greedy, implementation

Destroying Array

data structures, dsu

Harmonious Graph

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

Cow and Snacks

dfs and similar, dsu, graphs

New Year Permutation

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

A + B Strikes Back

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

Cthulhu

dfs and similar, dsu, graphs

Journey

dfs and similar, dp, dsu, implementation

Connect

brute force, dfs and similar, dsu

Mike and Feet

binary search, data structures, dp, dsu

Replace the Numbers

constructive algorithms, data structures, 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

Drazil and His Happy Friends

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

Rating System

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

New Reform

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

Love Rescue

dfs and similar, dsu, graphs, greedy, strings

The Number of Imposters

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

Social Network

dsu, graphs, greedy, implementation, trees

0-1 MST

dfs and similar, dsu, graphs, sortings

Minimum spanning tree for each edge

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

Shichikuji and Power Grid

dsu, graphs, greedy, shortest paths, trees

Lakes in Berland

dfs and similar, dsu, graphs, greedy, implementation

Socks

dfs and similar, dsu, graphs, greedy

Path Queries

divide and conquer, dsu, graphs, sortings, trees

Mad City

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

Andrey and Escape from Capygrad

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

Asya And Kittens

constructive algorithms, dsu

SUM and REPLACE

brute force, data structures, dsu, number theory

XOUR

data structures, dsu, sortings

Queue

dsu, implementation

Make It Connected

dsu, graphs, greedy

Selling a Menagerie

dfs and similar, dsu, graphs, implementation, math

Connected Components?

data structures, dfs and similar, dsu, graphs

Monopole Magnets

constructive algorithms, dfs and similar, dsu, graphs

Fix a Tree

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

MinOr Tree

bitmasks, dfs and similar, dsu, graphs, greedy

Sorting by Subsequences

dfs and similar, dsu, implementation, math, sortings

Petya and Catacombs

dsu, greedy, implementation, trees

Holes

data structures, dsu

Vessels

data structures, dsu, implementation, trees

Swaps in Permutation

dfs and similar, dsu, math

Berserk Monsters

brute force, data structures, dsu, implementation, math

Civilization

dfs and similar, dp, dsu, ternary search, trees

Sorting the Coins

dsu, implementation, sortings, two pointers

Arpa's weak amphitheater and Mehrdad's valuable Hoses

dfs and similar, dp, dsu

Array Repetition

binary search, brute force, dsu, implementation, math

Dominant Indices

data structures, dsu, trees

GCD and MST

constructive algorithms, dsu, graphs, greedy, number theory, sortings

Design Tutorial: Inverse the Problem

dfs and similar, dsu, shortest paths, trees

Ksyusha and Chinchilla

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

Alice and Hairdresser

dsu, implementation

The Door Problem

2-sat, dfs and similar, dsu, graphs

Two Fairs

combinatorics, dfs and similar, dsu, graphs

Hierarchy

dfs and similar, dsu, greedy, shortest paths

Serial Time!

dfs and similar, dsu

pSort

dfs and similar, dsu, graphs

Imbalanced Array

data structures, divide and conquer, dsu, sortings

Identify the Operations

combinatorics, data structures, dsu, greedy, implementation