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

Cutting Out

binary search, sortings

Good Array

Meme Problem

binary search, math

Berland Fair

binary search, brute force, data structures, greedy

BerOS File Suggestion

brute force, implementation

Debate

greedy

Garbage Disposal

greedy

Colored Rooks

constructive algorithms, graphs

Birthday

math

Binary Numbers AND Sum

data structures, implementation, math

Books Queries

implementation

Heaters

greedy, two pointers

Make It Equal

greedy

Vasya and Isolated Vertices

constructive algorithms, graphs

Oh Those Palindromes

constructive algorithms, strings

Banh-mi

greedy, implementation, math

Math

greedy, math, number theory

A Prank

greedy, implementation

Multiplicity

data structures, dp, implementation, math, number theory

Views Matter

greedy, implementation, sortings

Maximum Subrectangle

binary search, implementation, two pointers

Sequence Transformation

constructive algorithms, math

Forgery

implementation

DDoS

*special problem, brute force

Decorate Apple Tree

constructive algorithms, dfs and similar, dp, graphs, greedy, sortings, trees

Pick Heroes

greedy, implementation, interactive, sortings

Divide Candies

math, number theory

Alice and Hairdresser

dsu, implementation

Candies Distribution

constructive algorithms, implementation

Bicolorings

bitmasks, dp

Vasya and Multisets

brute force, dp, greedy, implementation, math

Splitting money

implementation

Space Formula

greedy

Palindrome Pairs

hashing, strings

The Tower is Going Home

binary search, two pointers

Mysterious Crime

brute force, combinatorics, math, meet-in-the-middle, two pointers

Smallest Word

constructive algorithms, greedy, implementation

Array Product

constructive algorithms, greedy, math

Glider

binary search, data structures, two pointers

Coffee Break

binary search, data structures, greedy, two pointers

Shashlik Cooking

dp, greedy, math

Gambling

greedy, sortings

Valid BFS?

dfs and similar, graphs, shortest paths, trees

Equalize

dp, greedy, strings