Draw Brackets!

*special problem, implementation

Online Courses In BSU

*special problem, dfs and similar, graphs, implementation

Maximize Sum of Digits

*special problem, implementation, math

k-Interesting Pairs Of Integers

*special problem, bitmasks, brute force, meet-in-the-middle

Cycle In Maze

*special problem, dfs and similar, graphs, greedy, shortest paths

Code For 1

constructive algorithms, dfs and similar, divide and conquer

Mahmoud and a Message

brute force, dp, greedy, strings

Artsem and Saunders

constructive algorithms, dsu, math

Timofey and a tree

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

USB vs. PS/2

greedy, implementation, sortings, two pointers

k-th divisor

math, number theory

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

Frodo and pillows

binary search, greedy

Unfair Poll

binary search, constructive algorithms, implementation, math

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 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

Servers

implementation

Green and Black Tea

constructive algorithms, greedy, math

Tram

constructive algorithms, implementation, math

Hongcow Solves A Puzzle

implementation

Hongcow Builds A Nation

dfs and similar, graphs

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 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

Exams

binary search, greedy, sortings

Socks

dfs and similar, dsu, graphs, greedy

Delete Them

constructive algorithms, implementation

Car Repair Shop

implementation

Sea Battle

constructive algorithms, greedy, math

Road to Cinema

binary search, greedy, sortings

Guess the Array

constructive algorithms, interactive, math

Bill Total Value

expression parsing, implementation, strings

Hidden Word

brute force, constructive algorithms, implementation, strings

Batch Sort

brute force, greedy, implementation, math

Lakes in Berland

dfs and similar, dsu, graphs, greedy, implementation

Polycarp at the Radio

greedy

Destroying Array

data structures, dsu

Broken Clock

brute force, implementation

Anatoly and Cockroaches

greedy

Efim and Strange Grade

dp, implementation, math

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

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

Pythagorean Triples

math, number theory

Bakery

graphs

Hard problem

dp, strings

Thor

brute force, data structures, implementation

Mishka and trip

implementation, 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

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

Swaps in Permutation

dfs and similar, dsu, math

s-palindrome

implementation, strings

Tree of Life (easy)

Brain Network (medium)

dfs and similar, graphs, trees

Brain Network (easy)

Recover Polygon (easy)

Mike and Chocolate Thieves

binary search, combinatorics, math

Mike and Shortcuts

dfs and similar, graphs, greedy, shortest paths

Mike and Cellphone

brute force, constructive algorithms, implementation

NP-Hard Problem

dfs and similar, graphs

Robbers' watch

brute force, combinatorics, dp, math

Chocolate Bar

*special problem, math

Symmetric Difference

*special problem

The Teacher of Physical Education

*special problem

Alyona and the Tree

dfs and similar, dp, graphs, trees

Heap Operations

constructive algorithms, data structures, greedy

Economy Game

brute force

Bear and Prime 100

constructive algorithms, interactive, math