Directed Roads

combinatorics, dfs and similar, graphs, math

Coloring Trees

dp

Chris and Magic Square

constructive algorithms, implementation

Bus to Udayland

brute force, implementation

String Set Queries

brute force, data structures, hashing, interactive, string suffix structures, strings

Generate a String

dfs and similar, dp

Two Arithmetic Progressions

math, number theory

Magic Odd Square

constructive algorithms, math

Optimal Point on a Line

brute force, sortings

King Moves

implementation

Checkpoints

greedy, implementation, sortings

Juicer

implementation

Student's Camp

dp, math

Incorrect Flow

flows

Centroids

data structures, dfs and similar, dp, graphs, greedy, trees

Recover the String

constructive algorithms, greedy, implementation, math

Letters Cyclic Shift

constructive algorithms, greedy, implementation, strings

Garlands

data structures

Persistent Bookcase

bitmasks, data structures, dfs and similar, implementation

Pythagorean Triples

math, number theory

Bakery

graphs

Brain's Photos

implementation

Working routine

data structures, implementation

Vasiliy's Multiset

binary search, bitmasks, data structures, trees

Hard problem

dp, strings

Interesting drink

binary search, dp, implementation

Beru-taxi

brute force, geometry, implementation

Spider Man

games, math

Hulk

implementation

Iron Man

data structures, geometry, trees

Captain America

flows, greedy

Black Widow

dp, graphs, implementation, math

Ant Man

dp, graphs, greedy

Thor

brute force, data structures, implementation

Mishka and Divisors

dp, number theory

Mishka and Interesting sum

data structures

Chris and Road

geometry, implementation

Mishka and trip

implementation, math

Mishka and Game

implementation

T-Shirts

data structures

Analysis of Pathes in Functional Graph

data structures, graphs

Road to Post Office

math

Cellular Network

binary search, implementation, two pointers

Powers of Two

brute force, data structures, implementation, math

Maximum Increase

dp, greedy, implementation

They Are Everywhere

binary search, strings, two pointers

Cells Not Under Attack

data structures, math

Cards

greedy, implementation

Cool Slogans

string suffix structures, strings

Huffman Coding on Segment

data structures, greedy

Break Up

dfs and similar, graphs

Connecting Universities

dfs and similar, dp, graphs, trees

As Fast As Possible

binary search, math

One Bomb

implementation

Launch of Collider

implementation

Coprime Permutation

combinatorics, number theory

Cron

Limak and Shooting Points

brute force, geometry, math

LRU

bitmasks, dp, math, probabilities

Fix a Tree

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

Vacations

dp

Barnicle

brute force, implementation, math, strings

Pineapple Incident

implementation, math

...Dary!

binary search, geometry, two pointers

...Wait for it...

data structures, dsu, trees

Legen...

data structures, dp, matrices, strings

PLEASE

combinatorics, dp, implementation, math, matrices

Puzzles

dfs and similar, math, probabilities, trees

Lorenzo Von Matterhorn

brute force, data structures, implementation, trees

Couple Cover

brute force, dp, number theory

Xor-sequences

matrices

Swaps in Permutation

dfs and similar, dsu, math

Exponential notation

implementation, strings

s-palindrome

implementation, strings

Fashion in Berland

implementation

Tree of Life (hard)

trees

Tree of Life (medium)

constructive algorithms, hashing, trees

Tree of Life (easy)

Photographs (II)

Photographs (I)

The Wall (hard)

dp

The Wall (medium)

combinatorics

The Wall (easy)

Brain Network (hard)

trees

Brain Network (medium)

dfs and similar, graphs, trees

Brain Network (easy)

Recover Polygon (hard)

data structures

Recover Polygon (medium)

geometry

Recover Polygon (easy)

Collective Mindsets (hard)

Collective Mindsets (medium)

Collective Mindsets (easy)

Mike and Geometry Problem

combinatorics, data structures, dp, geometry, implementation

Friends and Subsequences

binary search, data structures

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

Lovely Palindromes

constructive algorithms, math

Opponents

implementation

TOF

dfs and similar, graphs