Birthday

math

Books Queries

implementation

Views Matter

greedy, implementation, sortings

DDoS

*special problem, brute force

Splitting money

implementation

Space Formula

greedy

Minimum Ternary String

greedy, implementation

Sonya and Robots

constructive algorithms, implementation

Oracle for f(x) = k-th element of x

*special problem

Distinguish plus state and minus state

*special problem

Generate GHZ state

*special problem

Generate Bell state

*special problem

Suit and Tie

greedy, implementation, math

Knights of a Polygonal Table

greedy, implementation, sortings

Equal Sums

implementation, sortings

Three displays

brute force, dp, implementation

Useful Decomposition

implementation, trees

Bus Video System

combinatorics, math

Divide by three, multiply by two

dfs and similar, math, sortings

Valhalla Siege

binary search

Make a Square

brute force, implementation, math

Chessboard

bitmasks, brute force, implementation

Hyperspace Jump (easy)

expression parsing, math

Death Stars (easy)

implementation

Not simply beatiful strings

implementation

String Typing

implementation, strings

Our Tanya is Crying Out Loud

dp, greedy

Vile Grasshoppers

brute force, math, number theory

A Compatible Pair

brute force, games

Прокат велосипедов

*special problem, greedy, implementation

Chat

*special problem, dp

Swap Adjacent Elements

dfs and similar, greedy, math, sortings, two pointers

Three Garlands

brute force, constructive algorithms

Tic-Tac-Toe

implementation

Phone Numbers

implementation, strings

K-Dominant Character

binary search, implementation, two pointers

Race Against Time

implementation

Save the problem!

constructive algorithms

Arpa and an exam about geometry

geometry, math

Sorting by Subsequences

dfs and similar, dsu, implementation, math, sortings

Binary Blocks

brute force

Karen and Coffee

binary search, data structures, implementation

Tea Party

constructive algorithms, greedy, sortings

Minimum number of steps

combinatorics, greedy, implementation, math

Maximal Binary Matrix

constructive algorithms

Send the Fool Further! (easy)

dfs and similar, graphs, trees

T-shirt buying

data structures, implementation

Odd sum

dp, greedy, implementation

Draw Brackets!

*special problem, implementation

USB vs. PS/2

greedy, implementation, sortings, two pointers

k-th divisor

math, number theory

Bash's Big Day

greedy, math, number theory

Santa Claus and Robot

constructive algorithms, math

Hongcow Solves A Puzzle

implementation

Guess the Array

constructive algorithms, interactive, math

Anatoly and Cockroaches

greedy

Sonya and Queries

data structures, implementation

Chris and Magic Square

constructive algorithms, implementation

Optimal Point on a Line

brute force, sortings

Mishka and trip

implementation, math

One Bomb

implementation

Vacations

dp

Barnicle

brute force, implementation, math, strings

Mike and Cellphone

brute force, constructive algorithms, implementation

Chocolate Bar

*special problem, math

Bear and Prime 100

constructive algorithms, interactive, math

Vanya and Food Processor

implementation, math

Restoring Painting

brute force, constructive algorithms, math

Magic Powder - 1

binary search, brute force, implementation

Shopping

brute force

Gabriel and Caterpillar

implementation, math

Watchmen

data structures, geometry, math

Этажи

constructive algorithms

Little Artem and Matrix

implementation

Promocodes with Mistakes

*special problem, brute force, constructive algorithms, implementation

Alice, Bob, Two Teams

brute force, constructive algorithms

Cracking the Code

implementation, math

Benches

combinatorics, math

Gena's Code

implementation, math

Replace To Make Regular Bracket Sequence

data structures, expression parsing, math

More Cowbell

binary search, greedy

Approximating a Constant Range

dp, implementation, two pointers

Developing Skills

implementation, math, sortings

Preparing Olympiad

bitmasks, brute force

Mike and Fun

brute force, dp, greedy, implementation

Soldier and Cards

brute force, dfs and similar, games

Sea and Islands

constructive algorithms, implementation

Quasi Binary

constructive algorithms, dp, greedy, implementation

Cutting Banner

brute force, implementation

Covered Path

dp, greedy, math

Om Nom and Dark Park

dfs and similar, greedy, implementation

Pasha and String

constructive algorithms, greedy, math, strings

Name Quest

*special problem, greedy

Two Buttons

dfs and similar, graphs, greedy, implementation, math, shortest paths

Tanya and Postcard

greedy, implementation, strings

Drazil and Factorial

greedy, math, sortings

Han Solo and Lazer Gun

brute force, data structures, geometry, implementation, math

Permutations

brute force

Amr and Pins

geometry, math

Mr. Kitayuta's Colorful Graph

dfs and similar, dp, dsu, graphs