Petya and Catacombs

dsu, greedy, implementation, trees

Bertown Subway

dfs and similar, greedy, math

Lost in Transliteration

implementation

Field of Wonders

implementation, strings

Short Program

bitmasks, constructive algorithms

Slava and tanks

constructive algorithms

Nikita and string

brute force, dp

Divisiblity of Differences

implementation, math, number theory

Sorting the Coins

dsu, implementation, sortings, two pointers

Strange Game On Matrix

greedy, two pointers

Balanced Substring

dp, implementation

Maximum splitting

dp, greedy, math, number theory

Qualification Rounds

bitmasks, brute force, constructive algorithms, dp

Race Against Time

implementation

Save the problem!

constructive algorithms

Make a Permutation!

greedy, implementation, math

Bus

greedy, implementation, math

Kayaking

brute force, greedy, sortings

Mahmoud and Ehab and the bipartiteness

dfs and similar, graphs, trees

Pie Rules

dp, games

Polycarp's phone book

data structures, implementation, sortings

Did you mean...

dp, greedy, implementation

Which floor?

brute force, implementation

Set Theory

brute force, constructive algorithms

Marvolo Gaunt's Ring

brute force, data structures, dp

Planning

greedy

Bathroom terminal

implementation

Arpa and an exam about geometry

geometry, math

Five Dimensional Points

brute force, geometry, math

Tell Your World

brute force, geometry

From Y to Y

constructive algorithms

Load Testing

greedy

Preparing for Merge Sort

binary search, data structures

Union of Doubly Linked Lists

implementation

Curriculum Vitae

brute force, implementation

Two TVs

data structures, greedy, sortings

Luba And The Ticket

brute force, greedy, implementation

Rectangles

combinatorics, math

Sorting by Subsequences

dfs and similar, dsu, implementation, math, sortings

Leha and Function

combinatorics, greedy, math, number theory, sortings

Journey

dfs and similar, dp, graphs, probabilities, trees

Binary Blocks

brute force

Two Seals

brute force, implementation

Flag of Berland

brute force, implementation

Star sky

dp, implementation

The Meaningless Game

math, number theory

Petya and Exam

implementation, strings

Jury Marks

brute force, constructive algorithms

Cards Sorting

data structures, implementation, sortings

Black Square

implementation

String Reconstruction

data structures, greedy, sortings, strings

Suitable Replacement

binary search, greedy, implementation

Multi-judge Solving

greedy, implementation

Five-In-a-Row

brute force, implementation

Hacker, pack your bags!

binary search, greedy, implementation, sortings

Okabe and Boxes

data structures, greedy, trees

Okabe and Banana Trees

brute force, math

Mister B and Angle in Polygon

constructive algorithms, geometry, math

Multicolored Cars

data structures, implementation

Permutation Game

implementation

Really Big Numbers

binary search, brute force, dp, math

Makes And The Product

combinatorics, implementation, math, sortings

Karen and Coffee

binary search, data structures, implementation

Karen and Game

brute force, greedy, implementation

An impassioned circulation of affection

brute force, dp, strings, two pointers

An express train to reveries

constructive algorithms

The Tag Game

dfs and similar, graphs

Sagheer and Nubian Market

binary search, sortings

Sagheer, the Hausmeister

bitmasks, brute force, dp

Summer sell-off

greedy, sortings

Do you want a date?

implementation, math, sortings

Tea Party

constructive algorithms, greedy, sortings

Average Sleep Time

data structures, implementation, math

T-Shirt Hunt

brute force, implementation

Minimum number of steps

combinatorics, greedy, implementation, math

Maximal Binary Matrix

constructive algorithms

Send the Fool Further! (easy)

dfs and similar, graphs, trees

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

Find The Bone

implementation

Igor and his way to work

dfs and similar, graphs, implementation, shortest paths

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

Numbers Joke

*special problem

Andryusha and Colored Balloons

dfs and similar, graphs, greedy, trees

The Meeting Place Cannot Be Changed

binary search

String Game

binary search, greedy, strings

Alyona and Spreadsheet

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

Game of Credit Cards

data structures, dp, greedy, sortings

Stepan and Vowels

*special problem, implementation, strings

Lie or Truth

*special problem, constructive algorithms, implementation, sortings

Success Rate

binary search, math

Bear and Different Names

constructive algorithms, greedy

Bear and Friendship Condition

dfs and similar, dsu, graphs