Bark to Unlock

brute force, implementation, strings

Between the Offices

implementation

Flowers and Chocolate

combinatorics, math, matrices

Egg Roulette

bitmasks, brute force, divide and conquer, math, meet-in-the-middle

Hex Dyslexia

bitmasks, brute force, dp, graphs

Buy Low Sell High

constructive algorithms, data structures, greedy

Gotta Go Fast

binary search, dp

Ordering Pizza

binary search, sortings, ternary search

Save the problem!

constructive algorithms

Cities Excursions

dfs and similar, graphs, trees

Fire

dp, sortings

Make a Permutation!

greedy, implementation, math

Bus

greedy, implementation, math

Polycarp and Letters

brute force, implementation, strings

Fair Game

implementation, sortings

Graphic Settings

Almost Permutation

flows

Turn Off The TV

data structures, sortings

Yet Another Array Queries Problem

data structures, implementation

1-2-3

graphs, implementation

Kayaking

brute force, greedy, sortings

Quasi-palindrome

brute force, implementation

Mahmoud and Ehab and the final stage

data structures, strings

Mahmoud and Ehab and the function

binary search, data structures, sortings

Mahmoud and Ehab and the binary string

binary search, divide and conquer, interactive

Mahmoud and Ehab and the xor

constructive algorithms

Mahmoud and Ehab and the bipartiteness

dfs and similar, graphs, trees

Mahmoud and Ehab and the MEX

greedy, implementation

Arkady and a Nobody-men

data structures, dfs and similar, trees

Circle of Numbers

math

Ordering T-Shirts

greedy

Desk Disorder

combinatorics, dfs and similar, dsu, graphs, trees

Third Month Insanity

dp, probabilities, trees

Pie Rules

dp, games

Lazy Security Guard

brute force, geometry, math

Declined Finalists

greedy, implementation

Wizard's Tour

constructive algorithms, dfs and similar, graphs

Tests Renumeration

greedy, implementation

Polycarp's phone book

data structures, implementation, sortings

Did you mean...

dp, greedy, implementation

Which floor?

brute force, implementation

k-rounding

brute force, math, number theory

To Play or not to Play

greedy

Satellites

Masha and Cactus

dp, trees

Eleventh Birthday

combinatorics, dp, math

Similar Words

dp, hashing, strings, trees

Set Theory

brute force, constructive algorithms

Harry Vs Voldemort

dfs and similar, dp, graphs, trees

Nagini

binary search, data structures

Salazar Slytherin's Locket

bitmasks, dp

Rowena Ravenclaw's Diadem

trees

Helga Hufflepuff's Cup

dp, trees

Marvolo Gaunt's Ring

brute force, data structures, dp

Tom Riddle's Diary

brute force, implementation, strings

Maxim Buys an Apartment

constructive algorithms, math

Fraction

brute force, constructive algorithms, math

Lada Malina

data structures, geometry

Michael and Charging Stations

binary search, dp, greedy

Boredom

data structures

Jury Meeting

greedy, sortings, two pointers

Planning

greedy

Dating

brute force, dfs and similar, graphs, trees

Bob and stages

dp, geometry

Bathroom terminal

implementation

Product transformation

combinatorics, math, number theory

Casinos and travel

dp

Exploration plan

binary search, flows, graph matchings, shortest paths

Property

greedy, sortings

Neural Network country

dp, matrices

Digits

brute force, implementation, math

Arpa and an exam about geometry

geometry, math

Arpa and a research in Mexican wave

implementation, math

Rainbow Balls

math

Random Elections

bitmasks, brute force, divide and conquer, fft, math

Tournament Construction

constructive algorithms, dp, graphs, greedy, math

Arpa and a game with Mojtaba

bitmasks, dp, games

Arpa and a list of numbers

implementation, number theory

Five Dimensional Points

brute force, geometry, math

Tell Your World

brute force, geometry

Odds and Ends

implementation

Days of Floral Colours

combinatorics, divide and conquer, dp, fft, math

Shake It!

combinatorics, dp, flows, graphs

Goodbye Souvenir

data structures, divide and conquer

Rooter's Song

constructive algorithms, data structures, geometry, implementation, sortings, two pointers

From Y to Y

constructive algorithms

Weather Tomorrow

implementation, math

Berland SU Computer Network

constructive algorithms, dfs and similar, graphs, hashing, trees

Travel Cards

greedy, implementation, sortings

Students Initiation

binary search, flows, graphs

Noise Level

dfs and similar, implementation, math

Load Testing

greedy

University Classes

implementation

Berland Elections

greedy, sortings

Packmen

binary search, dp

Dog Show

constructive algorithms, data structures, greedy

Sum of Nestings

constructive algorithms

Preparing for Merge Sort

binary search, data structures

Union of Doubly Linked Lists

implementation

Random Query

data structures, math, probabilities, two pointers