Mahmoud and a Triangle

constructive algorithms, geometry, greedy, math, number theory, sortings

Mahmoud and Longest Uncommon Subsequence

constructive algorithms, strings

Math, math everywhere

brute force, dp, math, meet-in-the-middle, number theory

Souvenirs

data structures

Tree Folding

dfs and similar, dp, greedy, implementation, trees

Artsem and Saunders

constructive algorithms, dsu, math

Table Tennis Game 2

math

Code obfuscation

greedy, implementation, strings

Neverending competitions

implementation, math

Timofey and cubes

constructive algorithms, implementation

Taymyr is calling you

brute force, implementation, math

Timofey and our friends animals

data structures, divide and conquer, dsu

Timofey and a flat tree

data structures, graphs, hashing, shortest paths, trees

Timofey and remoduling

brute force, implementation, math, number theory

Timofey and rectangles

constructive algorithms, geometry

Timofey and a tree

dfs and similar, dp, dsu, graphs, implementation, trees

Tree nesting

combinatorics, graphs, trees

Radio stations

binary search, data structures

Maximum path

dp, greedy, implementation

Two strings

binary search, hashing, strings, two pointers

USB vs. PS/2

greedy, implementation, sortings, two pointers

k-th divisor

math, number theory

Dasha and Photos

brute force, data structures, dp, implementation

Dasha and Puzzle

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

Dasha and Very Difficult Problem

binary search, brute force, constructive algorithms, greedy, sortings

Dasha and Password

brute force, dp, implementation

Dasha and friends

brute force, implementation, math

Dasha and Stairs

brute force, constructive algorithms, implementation, math

Frodo and pillows

binary search, greedy

Petr and a calendar

implementation, math

Geometrical Progression

brute force, math, number theory

Broken Tree

dfs and similar, dp, graphs, greedy, trees

Ability To Convert

constructive algorithms, dp, greedy, math, strings

Unfair Poll

binary search, constructive algorithms, implementation, math

Blown Garland

brute force, implementation, number theory

Holiday Of Equality

implementation, math

Can Bash Save the Day?

data structures, divide and conquer, graphs, trees

Team Rocket Rises Again

data structures, graphs, shortest paths

Bash Plays with Functions

brute force, combinatorics, dp, number theory

Felicity's Big Secret Revealed

bitmasks, dp

Felicity is Coming!

data structures, hashing, sortings, strings

Bash's Big Day

greedy, math, number theory

Gotta Catch Em' All!

implementation

Long number

expression parsing, math, number theory

Byteland coins

combinatorics, dp, math

Bacterial Melee

brute force, combinatorics, dp, string suffix structures

Nikita and stack

data structures

Travel Card

binary search, dp

Pavel and barbecue

constructive algorithms, dfs and similar

PolandBall and Many Other Balls

combinatorics, divide and conquer, dp, fft, math, number theory

PolandBall and Gifts

bitmasks, dp, greedy

PolandBall and White-Red graph

constructive algorithms, graphs, shortest paths

PolandBall and Polygon

data structures

PolandBall and Forest

dfs and similar, dsu, graphs, interactive, trees

PolandBall and Game

binary search, data structures, games, greedy, sortings, strings

PolandBall and Hypothesis

brute force, graphs, math, number theory

Dasha and cyclic table

bitmasks, brute force, fft, strings, trees

Fedor and coupons

binary search, data structures, greedy, sortings

Vladik and chat

brute force, constructive algorithms, dp, implementation, strings

Ilya and tic-tac-toe game

brute force, implementation

Lesha and array splitting

constructive algorithms, greedy, implementation

Interactive Bulls and Cows (Hard)

brute force, constructive algorithms, interactive

Interactive Bulls and Cows (Easy)

brute force, constructive algorithms, implementation

Santa Claus and Candies

dp, greedy, math

New Year and Snowy Grid

dfs and similar, dsu, graphs, interactive

New Year and Binary Tree Paths

bitmasks, brute force, combinatorics, dp

New Year and Finding Roots

constructive algorithms, implementation, interactive, trees

New Year and Old Subsequence

data structures, divide and conquer, dp, matrices

New Year and Fireworks

brute force, data structures, dfs and similar, dp, implementation

New Year and Rating

binary search, greedy, math

New Year and North Pole

geometry, implementation

New Year and Hurry

binary search, brute force, implementation, math

Inversions After Shuffle

data structures, probabilities

Leaving Auction

binary search, data structures

Voting

greedy, implementation, two pointers

Parallelogram is Back

brute force, constructive algorithms, geometry

Bachgold Problem

greedy, implementation, math, number theory

Santa Clauses and a Soccer Championship

constructive algorithms, dfs and similar, graphs, trees

Santa Claus and Tangerines

binary search, data structures, greedy, two pointers

Santa Claus and a Palindrome

constructive algorithms, data structures, greedy

Santa Claus and Robot

constructive algorithms, math

Santa Claus and Keyboard Check

implementation, strings

Santa Claus and a Place in a Class

implementation, math

Igor and Interesting Numbers

brute force, combinatorics, dp, math

Comments

dfs and similar, expression parsing, implementation, strings

Winter Is Coming

dp, greedy, sortings

Servers

implementation

Mammoth's Genome Decoding

implementation, strings

Display Size

brute force, math

New Roads

constructive algorithms, graphs, trees

Music in Car

data structures, greedy, two pointers

Numbers Exchange

greedy, implementation, math

Green and Black Tea

constructive algorithms, greedy, math

Tram

constructive algorithms, implementation, math

Decoding

implementation, strings

Compote

implementation, math

Hongcow Solves A Puzzle

implementation

Hongcow Learns the Cyclic Shift

implementation, strings

Hongcow Masters the Cyclic Shift

strings, two pointers

Hongcow Draws a Circle

geometry