Cover it!

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

Recover it!

dfs and similar, graphs, greedy, number theory, sortings

Lose it!

dp, greedy, implementation

Array Splitting

greedy, sortings

Electrification

binary search, brute force, greedy

Catch Overflow!

data structures, expression parsing, implementation

Ehab and the Expected XOR Problem

bitmasks, constructive algorithms

Ehab and a Special Coloring Problem

constructive algorithms, number theory

Nauuo and Circle

combinatorics, dfs and similar, dp, trees

Nauuo and Cards

greedy, implementation

Pairs

graphs, implementation

Good Triple

brute force, two pointers

Increasing by Modulo

binary search, greedy

Bicolored RBS

constructive algorithms, greedy

News Distribution

dfs and similar, dsu, graphs

Lost Numbers

brute force, divide and conquer, interactive, math

A Tale of Two Lands

binary search, sortings, two pointers

Two Arrays and Sum of Functions

greedy, math, sortings

Almost All Divisors

math, number theory

Good String

greedy

Power Transmission (Hard Edition)

data structures, geometry, implementation, math

Power Transmission (Easy Edition)

brute force, geometry

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

N Problems During K Days

constructive algorithms, greedy, math

Increasing Subsequence (hard version)

greedy

Increasing Subsequence (easy version)

greedy

Long Number

greedy

Ugly Pairs

dfs and similar, greedy, implementation, sortings, strings

Inscribed Figures

geometry

Beautiful Array

brute force, data structures, divide and conquer, dp, greedy

Alarm Clocks Everywhere

math, number theory

Two Teams

data structures, implementation, sortings

Walking Robot

greedy

Gourmet Cat

implementation, math

Serval and Rooted Tree

binary search, dfs and similar, dp, greedy, trees

Serval and Parenthesis Sequence

greedy, strings

Neko does Maths

brute force, math, number theory

Neko Performs Cat Furrier Transform

bitmasks, constructive algorithms, dfs and similar, 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

Dirty Deeds Done Dirt Cheap

greedy, sortings

Crazy Diamond

constructive algorithms, sortings

Born This Way

binary search, brute force, two pointers

Chladni Figure

brute force, strings

Hide and Seek

graphs

Tree Diameter

bitmasks, graphs, interactive

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

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

Playlist

brute force, data structures, sortings

Edgy Trees

dfs and similar, dsu, graphs, math, trees

Circus

brute force, greedy, math, strings

Camp Schedule

greedy, hashing, strings

Skyscrapers

implementation, sortings

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

Painting the Fence

brute force

Asya And Kittens

constructive algorithms, dsu

Draw!

greedy, implementation

Connect

brute force, dfs and similar, dsu

Toy Train

brute force, greedy

Toy Train (Simplified)

brute force, greedy

System Testing

implementation

Diana and Liana

greedy, implementation, two pointers

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

Alyona and a Narrow Fridge

binary search, flows, greedy, sortings

Tree Cutting (Easy Version)

dfs and similar, trees

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

Magic Ship

binary search

Block unitary

*special problem

Chessboard unitary

*special problem

Anti-diagonal unitary

*special problem

Palindrome checker oracle

*special problem

OR oracle

*special problem

Flood Fill

dp

Trailing Loves (or L'oeufs?)

brute force, implementation, math, number theory

Yet Another Array Partitioning Task

constructive algorithms, greedy, sortings