Kuro and GCD and XOR and SUM

binary search, bitmasks, brute force, data structures, dp, dsu, greedy, math, number theory, strings, trees

Cyclic Components

dfs and similar, dsu, graphs

Visible Black Areas

data structures, dsu, geometry, trees

Mahmoud and Ehab and the message

dsu, greedy, implementation

Love Rescue

dfs and similar, dsu, graphs, greedy, strings

Shortest Path Queries

bitmasks, data structures, dsu, graphs

Iqea

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

SUM and REPLACE

brute force, data structures, dsu, number theory

Connected Components?

data structures, dfs and similar, dsu, graphs

Imbalance Value of a Tree

data structures, dsu, graphs, trees

Coloring a Tree

dfs and similar, dsu, greedy

Bipartite Segments

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

Segments Removal

data structures, dsu, flows, implementation, two pointers

Welcome home, Chtholly

data structures, dsu

Envy

data structures, dsu, graphs

Petya and Catacombs

dsu, greedy, implementation, trees

Binary Matrix

dsu

Royal Questions

dsu, graphs, greedy

Sorting the Coins

dsu, implementation, sortings, two pointers

Forbidden Indices

dsu, string suffix structures, strings

Points, Lines and Ready-made Titles

dfs and similar, dsu, graphs, trees

Desk Disorder

combinatorics, dfs and similar, dsu, graphs, trees

Sorting by Subsequences

dfs and similar, dsu, implementation, math, sortings

Imbalanced Array

data structures, divide and conquer, dsu, sortings

Bipartite Checking

data structures, dsu, graphs

Vladik and Entertaining Flags

data structures, dsu, graphs

Weird journey

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

Peterson Polyglot

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

The Door Problem

2-sat, dfs and similar, dsu, graphs

Bear and Friendship Condition

dfs and similar, dsu, graphs

Mahmoud and a Dictionary

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

Artsem and Saunders

constructive algorithms, dsu, math

Timofey and our friends animals

data structures, divide and conquer, dsu

Timofey and a tree

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

PolandBall and Forest

dfs and similar, dsu, graphs, interactive, trees

New Year and Snowy Grid

dfs and similar, dsu, graphs, interactive

Arpa's weak amphitheater and Mehrdad's valuable Hoses

dfs and similar, dp, dsu

Drivers Dissatisfaction

data structures, dsu, graphs, trees

Socks

dfs and similar, dsu, graphs, greedy

st-Spanning Tree

dsu, graphs, greedy, implementation

Lakes in Berland

dfs and similar, dsu, graphs, greedy, implementation

Destroying Array

data structures, dsu

Digit Tree

dfs and similar, divide and conquer, dsu, trees

Fix a Tree

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

...Wait for it...

data structures, dsu, trees

Swaps in Permutation

dfs and similar, dsu, math

Dividing Kingdom II

brute force, data structures, dsu, graphs, sortings

Bear and Square Grid

dfs and similar, dsu, implementation

Correct Bracket Sequence Editor

data structures, dsu, strings

Polycarp and Hay

dfs and similar, dsu, graphs, greedy, sortings

New Reform

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

Bear and Forgotten Tree 2

dfs and similar, dsu, graphs, trees

Pursuit For Artifacts

dfs and similar, dsu, graphs, trees

Clockwork Bomb

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

Table Compression

dfs and similar, dp, dsu, graphs, greedy

Island Puzzle

dfs and similar, dsu, graphs, trees

Minimum spanning tree for each edge

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

Pastoral Oddities

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

Moodular Arithmetic

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

Acyclic Organic Compounds

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

Lomsat gelral

data structures, dfs and similar, dsu, trees

Campus

binary search, data structures, dsu, trees

Restructuring Company

data structures, dsu

Love Triangles

dfs and similar, dsu, graphs

Mike and Feet

binary search, data structures, dp, dsu

Drazil and Morning Exercise

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

Drazil and His Happy Friends

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

Mr. Kitayuta's Colorful Graph

brute force, dfs and similar, dsu, graphs

Mr. Kitayuta's Colorful Graph

dfs and similar, dp, dsu, graphs

Misha and Changing Handles

data structures, dsu, strings

New Year Domino

data structures, dp, dsu

New Year Permutation

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

Queue

dsu, implementation

Design Tutorial: Inverse the Problem

dfs and similar, dsu, shortest paths, trees

MUH and Lots and Lots of Segments

data structures, dsu

Two Sets

2-sat, dfs and similar, dsu, graph matchings, greedy

Information Graph

dfs and similar, dsu, graphs, trees

Appleman and Complicated Task

dsu, math

Civilization

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

Three strings

data structures, dsu, string suffix structures, strings

DZY Loves Chemistry

dfs and similar, dsu, greedy

DZY Loves Planting

binary search, dsu, trees

Valera and Swaps

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

The Child and Zoo

dsu, sortings

Dungeons and Candies

dsu, graphs, greedy, trees

Nanami's Digital Board

dsu, implementation

A + B Strikes Back

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

Dima and Bacteria

dsu, graphs, shortest paths

Inna and Babies

binary search, data structures, dsu, geometry, implementation

Vessels

data structures, dsu, implementation, trees

Dima and Trap Graph

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

Fools and Foolproof Roads

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

Dima and Kicks

brute force, dsu, graphs, implementation

Knight Tournament

data structures, dsu

The Red Button

combinatorics, dfs and similar, dsu, graphs, greedy

Reclamation

dsu

Ilya and Two Numbers

constructive algorithms, data structures, dsu, greedy

Connected Components

data structures, dfs and similar, dp, dsu

Learning Languages

dfs and similar, dsu

Black and White Tree

constructive algorithms, dsu, graphs, greedy, trees