Send the Fool Further! (easy)

dfs and similar, graphs, trees

Heidi and Library (medium)

data structures, greedy

Heidi and Library (easy)

greedy

Fountains

binary search, data structures, implementation

T-shirt buying

data structures, implementation

Mike and gcd problem

dp, greedy, number theory

Mike and strings

brute force, dp, strings

Minimal string

data structures, greedy, strings

Odd sum

dp, greedy, implementation

Bank Hacking

constructive algorithms, data structures, dp, trees

Find The Bone

implementation

Naming Company

games, greedy, sortings

Igor and his way to work

dfs and similar, graphs, implementation, shortest paths

Paths in a Complete Binary Tree

bitmasks, trees

Counting-out Rhyme

implementation

Masha and geometric depression

brute force, implementation, math

Functions again

dp, two pointers

Not Afraid

greedy, implementation, math

Anton and Fairy Tale

binary search, math

Crunching Numbers Just for You

*special problem, implementation

Touchy-Feely Palindromes

*special problem, implementation

INTERCALC

*special problem, implementation

Numbers Joke

*special problem

Innokenty and a Football League

2-sat, graphs, greedy, implementation, shortest paths, strings

Andryusha and Colored Balloons

dfs and similar, graphs, greedy, trees

The Meeting Place Cannot Be Changed

binary search

Bitwise Formula

bitmasks, brute force, dfs and similar, expression parsing, implementation

String Game

binary search, greedy, strings

Cloud of Hashtags

binary search, greedy, implementation, strings

Alyona and Spreadsheet

binary search, data structures, dp, greedy, implementation, two pointers

Game of Credit Cards

data structures, dp, greedy, sortings

Molly's Chemicals

binary search, brute force, data structures, implementation, math

Stepan and Vowels

*special problem, implementation, strings

Lie or Truth

*special problem, constructive algorithms, implementation, sortings

Success Rate

binary search, math

Volatile Kite

geometry

Voltage Keepsake

binary search, math

Bear and Different Names

constructive algorithms, greedy

Bear and Friendship Condition

dfs and similar, dsu, graphs

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

Jon Snow and his Favourite Number

brute force, dp, implementation, sortings

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

Felicity is Coming!

data structures, hashing, sortings, strings

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