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

The Lakes

dfs and similar, dsu, graphs, implementation

Learning Languages

dfs and similar, dsu

Find the Different Ones!

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

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

Hemose Shopping

constructive algorithms, dsu, math, sortings

Misha and Changing Handles

data structures, dsu, strings

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

Mr. Kitayuta's Colorful Graph

dfs and similar, dp, dsu, graphs

DZY Loves Chemistry

dfs and similar, dsu, greedy

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

String Transformation 1

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

Round Dance

dfs and similar, dsu, graphs, shortest paths

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

Odd-Even Subsequence

binary search, dp, dsu, greedy, implementation

Mahmoud and Ehab and the message

dsu, greedy, implementation

Harmonious Graph

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

Cow and Snacks

dfs and similar, dsu, graphs

Destroying Array

data structures, dsu

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

Peaceful Rooks

dfs and similar, dsu, graphs

Replace the Numbers

constructive algorithms, data structures, dsu, implementation

Boris and His Amazing Haircut

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

The Third Letter

dfs and similar, dsu, graphs, greedy, implementation

Drazil and His Happy Friends

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

New Reform

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

Rating System

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

Love Rescue

dfs and similar, dsu, graphs, greedy, strings

The Number of Imposters

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

0-1 MST

dfs and similar, dsu, graphs, sortings

Minimum spanning tree for each edge

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

Social Network

dsu, graphs, greedy, implementation, 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

Queue

dsu, implementation

Make It Connected

dsu, graphs, greedy

Monopole Magnets

constructive algorithms, dfs and similar, dsu, graphs

Connected Components?

data structures, dfs and similar, dsu, graphs

Selling a Menagerie

dfs and similar, dsu, graphs, implementation, math

Fix a Tree

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

Sorting by Subsequences

dfs and similar, dsu, implementation, math, sortings

MinOr Tree

bitmasks, dfs and similar, dsu, graphs, greedy

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

Arpa's weak amphitheater and Mehrdad's valuable Hoses

dfs and similar, dp, dsu

Civilization

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

Sorting the Coins

dsu, implementation, sortings, two pointers

Berserk Monsters

brute force, data structures, dsu, implementation, math

Dominant Indices

data structures, dsu, trees

Array Repetition

binary search, brute force, dsu, implementation, math

GCD and MST

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

Design Tutorial: Inverse the Problem

dfs and similar, dsu, shortest paths, trees

Alice and Hairdresser

dsu, implementation

Ksyusha and Chinchilla

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

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

Imbalanced Array

data structures, divide and conquer, dsu, sortings

pSort

dfs and similar, dsu, graphs

Identify the Operations

combinatorics, data structures, dsu, greedy, implementation

Counting Graphs

combinatorics, divide and conquer, dsu, graphs, greedy, sortings, trees