Neko and Flashback

constructive algorithms, dfs and similar, graphs

Neko and Aki's Prank

dp, greedy, trees

Neko does Maths

brute force, math, number theory

Sonya and Informatics

combinatorics, dp, matrices, probabilities

Number of Components

combinatorics, data structures, dp, math

Stas and the Queue at the Buffet

greedy, math, sortings

Problem for Nazar

constructive algorithms, math

Dima and a Bad XOR

bitmasks, brute force, constructive algorithms, dp

Election Promises

games, graphs

Abandoning Roads

brute force, dp, graphs, greedy

Tree Generator™

data structures, implementation, trees

Three Religions

dp, implementation, strings

Holy Diver

data structures

Gold Experience

constructive algorithms, graphs, math, number theory, probabilities

Foo Fighters

bitmasks, constructive algorithms

Earth Wind and Fire

constructive algorithms, greedy, math, sortings, two pointers

Dirty Deeds Done Dirt Cheap

greedy, sortings

Crazy Diamond

constructive algorithms, sortings

Born This Way

binary search, brute force, two pointers

Zigzag Game

games, interactive

Rainbow Coins

interactive

Palindrome XOR

dfs and similar, graphs

Thanos Nim

games

Chladni Figure

brute force, strings

Hide and Seek

graphs

Satanic Panic

dp, geometry

Zoning Restrictions

dp, flows, graphs

Leaf Partition

dp, trees

Hot is Cold

bitmasks, data structures, divide and conquer, implementation

Frog Jumping

dfs and similar, math, number theory

Tree Diameter

bitmasks, graphs, interactive

Two Merged Sequences

dp, greedy

Graph Without Long Directed Paths

dfs and similar, graphs

Median String

bitmasks, math, number theory, strings

Equalize Them All

constructive algorithms, greedy

Queen

dfs and similar, trees

Pink Floyd

graphs, interactive

Foreigner

dp

U2

geometry

Lynyrd Skynyrd

data structures, dfs and similar, dp, math, trees

The Beatles

brute force, math

Privatization of Roads in Treeland

binary search, constructive algorithms, dfs and similar, graphs, greedy, trees

Same Sum Blocks (Hard)

data structures, greedy

Same Sum Blocks (Easy)

greedy

Superhero Battle

math

Colored Boots

greedy, implementation

Polycarp Restores Permutation

math

Double Tree

data structures, divide and conquer, shortest paths, trees

Extending Set of Points

data structures, divide and conquer, dsu

Palindrome-less Arrays

combinatorics, divide and conquer, dp

Playlist

brute force, data structures, sortings

Dish Shopping

data structures, divide and conquer

Maximize Mex

flows, graph matchings, graphs

Steps to One

dp, math, number theory, probabilities

Edgy Trees

dfs and similar, dsu, graphs, math, trees

Circus

brute force, greedy, math, strings

Matches Are Not a Child's Play

data structures, trees

Train Car Selection

data structures, greedy

Cooperative Game

constructive algorithms, interactive, number theory

Museums Tour

dp, graphs, implementation

Camp Schedule

greedy, hashing, strings

Skyscrapers

implementation, sortings

Nastya Hasn't Written a Legend

binary search, data structures

Nastya Is Buying Lunch

greedy

Nastya Is Transposing Matrices

constructive algorithms, sortings

Spanning Tree with One Fixed Degree

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

Spanning Tree with Maximum Degree

graphs

K Balanced Teams

dp, sortings, two pointers

Zero Quantity Maximization

hashing, math, number theory

Greedy Subsequences

data structures, dp, trees

Clear the String

dp

Knapsack

dfs and similar, dp, greedy

Stressful Training

binary search, greedy

Painting the Fence

brute force

Most Dangerous Shark

data structures, dp, two pointers

Asya And Kittens

constructive algorithms, dsu

String Multiplication

dp, greedy, strings

Gourmet choice

dfs and similar, dp, dsu, graphs, greedy

Draw!

greedy, implementation

Connect

brute force, dfs and similar, dsu

Legendary Tree

binary search, interactive, trees

Isolation

data structures, dp

Morse Code

binary search, data structures, dp, hashing, sortings, string suffix structures, strings

Wrong Answer

constructive algorithms

Toy Train

brute force, greedy

Toy Train (Simplified)

brute force, greedy

System Testing

implementation

Secret Letters

data structures, dp, greedy

The very same Munchhausen

brute force

Power Tree

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

Compress String

dp, strings

Once in a casino

constructive algorithms, greedy, implementation, math

Diana and Liana

greedy, implementation, two pointers

Triple

fft, math

Get Ready for the Battle

constructive algorithms, implementation

Niyaz and Small Degrees

data structures, dp, trees

Pavel and Triangles

brute force, dp, fft, greedy, ternary search

Frets On Fire

binary search, sortings

Ramesses and Corner Inversion

constructive algorithms, greedy, implementation, math

Tree Cutting (Hard Version)

combinatorics, dfs and similar, dp, trees