Lost Array

graphs, greedy, interactive, shortest paths

Lost Tree

constructive algorithms, interactive, trees

Little Alawn's Puzzle

combinatorics, dp, dsu, graphs, math

Histogram Ugliness

greedy, implementation, math

Colour the Flag

brute force, implementation

Pawns

*special problem

Excursions

*special problem, constructive algorithms, dfs and similar, flows, graph matchings, graphs

Submatrices

*special problem, bitmasks, data structures, dp

Biome Map

*special problem, constructive algorithms, dfs and similar, graphs

Binary String Partition

*special problem, binary search, greedy

Chess Team Forming

*special problem, binary search, data structures, greedy

String Searching

*special problem, hashing

Sweets

*special problem, data structures, implementation

Nearest Point Function

*special problem, implementation

Travel to Bertown

*special problem, implementation, math

Prefixes and Suffixes

*special problem, strings

Good Array

*special problem

Teams Forming

*special problem, sortings

Uniform String

*special problem, implementation

Frog Jumping

*special problem, math

A+B (Trial Problem)

*special problem

Сортировка слиянием

*special problem, binary search

Сортировка слиянием

*special problem, *special problem, brute force

Сортировка слиянием

*special problem

Редактируем Зингер | color

*special problem, *special problem

Симметричный амфитеатр

*special problem, constructive algorithms, dp

Мониторинг

*special problem

Мониторинг

*special problem, *special problem

Зингер | color

*special problem, implementation

Turing's Award

data structures, dp

What a Reversal

constructive algorithms

Bingo

bitmasks, combinatorics, dp, math, probabilities

Minimax

constructive algorithms, greedy, strings

Secret Santa

constructive algorithms, flows, graphs, greedy, math

Pursuit

binary search, brute force, greedy, sortings

Putting Plates

constructive algorithms, implementation

Binary Decimal

greedy, math

Sifid and Strange Subsequences

greedy, math, sortings

Eshag Loves Big Arrays

constructive algorithms, greedy, math

AmShZ Farm

combinatorics, fft, math

Mashtali and Hagh Trees

combinatorics, dp, trees

It's a bird! No, it's a plane! No, it's AaParsa!

constructive algorithms, graphs, shortest paths

Trees of Tranquillity

data structures, dfs and similar, greedy, trees

Kavi on Pairing Duty

combinatorics, dp, math

Parsa's Humongous Tree

dfs and similar, divide and conquer, dp, greedy, trees

Partition Game

binary search, data structures, divide and conquer, dp

MEX Tree

combinatorics, dfs and similar, implementation, math, trees

Sequence Pair Weight

hashing, implementation, math

Palindrome Game (hard version)

constructive algorithms, games

Palindrome Game (easy version)

constructive algorithms, games

And Then There Were K

bitmasks

Median Queries

constructive algorithms, interactive, probabilities

Oolimry and Suffix Array

combinatorics, constructive algorithms, math

Kill Anton

brute force, constructive algorithms, data structures, math, strings

Potions (Hard Version)

data structures, greedy

Potions (Easy Version)

brute force, data structures, dp, greedy

I Hate 1111

dp, math, number theory

Mean Inequality

constructive algorithms, sortings

Goblins And Gnomes

brute force, dp, flows, graph matchings

Assimilation IV

combinatorics, dp, math, probabilities, two pointers

Armchairs

dp, flows, graph matchings, greedy

Robot Collisions

data structures, greedy, implementation, sortings

Permutation Sort

constructive algorithms, greedy

Potion-making

math, number theory

Hopping Around the Array

data structures, dp

Try Booking

data structures, divide and conquer

Favorite Game

bitmasks, dp

Crypto Lights

combinatorics, dp, math, probabilities

Love-Hate

bitmasks, brute force, dp, probabilities

Compression and Expansion

brute force, data structures, greedy, implementation, trees

Lord of the Values

constructive algorithms

Game of Life

implementation

Nastia and a Beautiful Matrix

binary search, constructive algorithms, dp, greedy

Nastia Plays with a Tree

constructive algorithms, data structures, dfs and similar, dp, dsu, greedy, implementation, trees

Nastia and a Hidden Permutation

constructive algorithms, interactive

Nastia and a Good Array

constructive algorithms, math, number theory

Nastia and Nearly Good Numbers

constructive algorithms, math, number theory

To Go Or Not To Go?

brute force, dfs and similar, graphs, greedy, implementation, shortest paths

Guess the K-th Zero (Hard version)

binary search, constructive algorithms, data structures, interactive

Guess the K-th Zero (Easy version)

binary search, interactive

Arranging The Sheep

greedy, math

Same Differences

data structures, hashing, math

Not Adjacent Matrix

constructive algorithms

Ordinary Numbers

brute force, math, number theory

Do Not Be Distracted!

brute force, implementation

Chests and Keys

bitmasks, brute force, dfs and similar, dp, flows

Off by One

constructive algorithms, dfs and similar, geometry, graphs, sortings, trees

Maximum Sum of Products

brute force, dp, implementation, math, two pointers

Berland Regional

brute force, data structures, greedy, number theory, sortings

The Cake Is a Lie

dp, math

Red and Blue Beans

math

Fly Around the World

dp, geometry

Starry Night Camping

constructive algorithms, flows, graphs

Reunion

combinatorics, dp, trees

Group Photo

binary search, data structures, implementation, two pointers

Explorer Space

dp, graphs, shortest paths

Fillomino 2

constructive algorithms, dfs and similar, greedy, implementation

Morning Jogging

constructive algorithms, greedy, sortings

Sum of 2050

greedy, math

Baby Ehab Plays with Permutations

combinatorics, dp, math