Bash's Big Day

greedy, math, number theory

Travel Card

binary search, dp

Pavel and barbecue

constructive algorithms, dfs and similar

PolandBall and Forest

dfs and similar, dsu, graphs, interactive, trees

Interactive Bulls and Cows (Easy)

brute force, constructive algorithms, implementation

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

Voting

greedy, implementation, two pointers

Santa Claus and Robot

constructive algorithms, math

Santa Claus and Keyboard Check

implementation, strings

Comments

dfs and similar, expression parsing, implementation, strings

Winter Is Coming

dp, greedy, sortings

Servers

implementation

Numbers Exchange

greedy, implementation, math

Green and Black Tea

constructive algorithms, greedy, math

Tram

constructive algorithms, implementation, math

Hongcow Solves A Puzzle

implementation

Hongcow's Game

bitmasks, divide and conquer, interactive

Hongcow Builds A Nation

dfs and similar, graphs

Chloe and pleasant prizes

dfs and similar, dp, graphs, trees

Vladik and fractions

brute force, constructive algorithms, math, number theory

Arpa’s obvious problem and Mehrdad’s terrible solution

brute force, math, number theory

Arpa's weak amphitheater and Mehrdad's valuable Hoses

dfs and similar, dp, dsu

Arpa's loud Owf and Mehrdad's evil plan

dfs and similar, math

Alyona and copybooks

brute force, implementation

Alyona and a tree

binary search, data structures, dfs and similar, graphs, trees

Alyona and mex

constructive algorithms, greedy

Taxes

math, number theory

Tennis Championship

combinatorics, constructive algorithms, greedy, math

Anton and Chess

implementation

Anton and Making Potions

binary search, dp, greedy, two pointers

Kostya the Sculptor

data structures, hashing

Epidemic in Monstropolis

constructive algorithms, dp, greedy, two pointers

Exams

binary search, greedy, sortings

Video Cards

brute force, data structures, implementation, math, number theory

Socks

dfs and similar, dsu, graphs, greedy

Bottles

dp

Delete Them

constructive algorithms, implementation

Car Repair Shop

implementation

Minimum and Maximum

constructive algorithms, interactive

Toda 2

greedy, implementation

Subordinates

constructive algorithms, data structures, graphs, greedy, sortings

Sea Battle

constructive algorithms, greedy, math

Road to Cinema

binary search, greedy, sortings

T-shirts Distribution

constructive algorithms, flows, greedy

Guess the Array

constructive algorithms, interactive, math

Bill Total Value

expression parsing, implementation, strings

Contest Balloons

data structures, greedy

Hidden Word

brute force, constructive algorithms, implementation, strings

Dense Subsequence

data structures, greedy, strings

Ray Tracing

greedy, hashing, implementation, math, number theory, sortings

Batch Sort

brute force, greedy, implementation, math

Lakes in Berland

dfs and similar, dsu, graphs, greedy, implementation

Polycarp at the Radio

greedy

Generating Sets

binary search, data structures, dfs and similar, greedy, strings, trees

Destroying Array

data structures, dsu

Broken Clock

brute force, implementation

Journey

dp, graphs

Anatoly and Cockroaches

greedy

Efim and Strange Grade

dp, implementation, math

Paint it really, really dark gray

dfs and similar

Dexterina’s Lab

games, matrices, probabilities

Complete the Word

greedy, two pointers

Plus and Square Root

constructive algorithms, math

Sonya and Queries

data structures, implementation

Memory and De-Evolution

greedy, math

Directed Roads

combinatorics, dfs and similar, graphs, math

Coloring Trees

dp

Chris and Magic Square

constructive algorithms, implementation

Magic Odd Square

constructive algorithms, math

Optimal Point on a Line

brute force, sortings

Checkpoints

greedy, implementation, sortings

Recover the String

constructive algorithms, greedy, implementation, math

Pythagorean Triples

math, number theory

Bakery

graphs

Vasiliy's Multiset

binary search, bitmasks, data structures, trees

Hard problem

dp, strings

Thor

brute force, data structures, implementation

Mishka and trip

implementation, math

Road to Post Office

math

Cellular Network

binary search, implementation, two pointers

Powers of Two

brute force, data structures, implementation, math

They Are Everywhere

binary search, strings, two pointers

Connecting Universities

dfs and similar, dp, graphs, trees

As Fast As Possible

binary search, math

One Bomb

implementation

Fix a Tree

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

Vacations

dp

Barnicle

brute force, implementation, math, strings

Puzzles

dfs and similar, math, probabilities, trees

Lorenzo Von Matterhorn

brute force, data structures, implementation, trees

Xor-sequences

matrices

Swaps in Permutation

dfs and similar, dsu, math

Exponential notation

implementation, strings

s-palindrome

implementation, strings

Tree of Life (easy)

Photographs (I)

The Wall (medium)

combinatorics

Brain Network (medium)

dfs and similar, graphs, trees