Two Arrays and Sum of Functions

greedy, math, sortings

Almost All Divisors

math, number theory

Good String

greedy

Cat Party (Hard Edition)

data structures, implementation

Cat Party (Easy Edition)

data structures, implementation

Double Matrix

brute force, greedy

Expansion coefficient of the array

implementation, math

The Party and Sweets

binary search, constructive algorithms, greedy, implementation, math, sortings, two pointers

Minimum Array

binary search, data structures, greedy

Increasing Subsequence (hard version)

greedy

Increasing Subsequence (easy version)

greedy

Long Number

greedy

Inscribed Figures

geometry

Alarm Clocks Everywhere

math, number theory

Walking Robot

greedy

Gourmet Cat

implementation, math

Serval and Parenthesis Sequence

greedy, strings

Neko Performs Cat Furrier Transform

bitmasks, constructive algorithms, dfs and similar, math

Stas and the Queue at the Buffet

greedy, math, sortings

Dima and a Bad XOR

bitmasks, brute force, constructive algorithms, dp

Crazy Diamond

constructive algorithms, sortings

Born This Way

binary search, brute force, two pointers

Hide and Seek

graphs

Tree Diameter

bitmasks, graphs, interactive

Graph Without Long Directed Paths

dfs and similar, graphs

Equalize Them All

constructive algorithms, greedy

Queen

dfs and similar, trees

The Beatles

brute force, math

Superhero Battle

math

Colored Boots

greedy, implementation

Polycarp Restores Permutation

math

Playlist

brute force, data structures, sortings

Edgy Trees

dfs and similar, dsu, graphs, math, trees

Camp Schedule

greedy, hashing, strings

Skyscrapers

implementation, sortings

Nastya Is Transposing Matrices

constructive algorithms, sortings

Spanning Tree with Maximum Degree

graphs

Zero Quantity Maximization

hashing, math, number theory

Painting the Fence

brute force

Asya And Kittens

constructive algorithms, dsu

Draw!

greedy, implementation

Connect

brute force, dfs and similar, dsu

Toy Train (Simplified)

brute force, greedy

System Testing

implementation

Ramesses and Corner Inversion

constructive algorithms, greedy, implementation, math

Alyona and a Narrow Fridge

binary search, flows, greedy, sortings

Yet Another Ball Problem

constructive algorithms, implementation

Coffee and Coursework (Hard Version)

binary search, greedy

Coffee and Coursework (Easy version)

brute force, greedy

Palindromic Matrix

constructive algorithms, implementation

Block unitary

*special problem

Chessboard unitary

*special problem

Anti-diagonal unitary

*special problem

Palindrome checker oracle

*special problem

OR oracle

*special problem

Trailing Loves (or L'oeufs?)

brute force, implementation, math, number theory

Yet Another Array Partitioning Task

constructive algorithms, greedy, sortings

Sasha and Magnetic Machines

greedy, number theory

Creative Snap

binary search, brute force, divide and conquer, math

Average Superhero Gang Power

brute force, implementation, math

Meaningless Operations

constructive algorithms, math, number theory

Tape

greedy, sortings

Sasha and a Bit of Relax

dp, implementation

Diverse Garland

constructive algorithms, dp, greedy

Nice Garland

brute force, greedy, math

Brutality

greedy, sortings, two pointers

Lunar New Year and a Wander

data structures, dfs and similar, graphs, greedy, shortest paths

Lunar New Year and Food Ordering

data structures, implementation

Ayoub and Lost Array

combinatorics, dp, math

Grid game

constructive algorithms, implementation

Monotonic Renumeration

combinatorics, sortings

Balanced Ternary String

greedy, strings

Array K-Coloring

greedy, sortings

Polycarp's New Job

implementation

Division and Union

sortings

Accordion

greedy, implementation

Build a Contest

data structures, implementation

Sum in the tree

constructive algorithms, dfs and similar, greedy, trees

Yuhao and a Parenthesis

greedy, implementation

Polygon for the Angle

brute force, geometry

Substring Removal

combinatorics, math, strings

Circular Dance

implementation

Powers Of Two

bitmasks, greedy

Beautiful Graph

dfs and similar, graphs

Mishka and the Last Exam

greedy

Prefixes and Suffixes

strings

New Year and the Permutation Concatenation

combinatorics, dp, math

New Year and the Sphere Transmission

math, number theory

Company Merging

greedy

Guest Student

math

Easy Chess

constructive algorithms

Ehab and a 2-operation task

constructive algorithms, greedy, math

Minimum Diameter Tree

constructive algorithms, implementation, trees

Connect Three

implementation, math

The Fair Nut and String

combinatorics, dp, implementation

Multi-Subject Competition

greedy, sortings

Vova and Trophies

greedy

Colorful Bricks

combinatorics, dp, math

Farewell Party

constructive algorithms, implementation

Masha and two friends

implementation