Pythagorean Triples

math, number theory

Working routine

data structures, implementation

Vasiliy's Multiset

binary search, bitmasks, data structures, trees

Hard problem

dp, strings

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

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

They Are Everywhere

binary search, strings, two pointers

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

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

...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

Tree of Life (hard)

trees

Tree of Life (medium)

constructive algorithms, hashing, trees

Photographs (II)

Photographs (I)

The Wall (hard)

dp

The Wall (medium)

combinatorics

Brain Network (hard)

trees

Brain Network (medium)

dfs and similar, graphs, trees

Recover Polygon (hard)

data structures

Recover Polygon (medium)

geometry

Recover Polygon (easy)

Collective Mindsets (hard)

Collective Mindsets (medium)

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

TOF

dfs and similar, graphs

Dividing Kingdom II

brute force, data structures, dsu, graphs, sortings

The Values You Can Make

dp

Remainders Game

chinese remainder theorem, math, number theory

NP-Hard Problem

dfs and similar, graphs

Travelling Through the Snow Queen's Kingdom

bitmasks, brute force, divide and conquer, graphs

Kay and Eternity

brute force, implementation, sortings

Optimal Point

binary search, math

Kay and Snowflake

data structures, dfs and similar, dp, trees

Robbers' watch

brute force, combinatorics, dp, math

The Hero with Bombs

*special problem

Loader

*special problem, graphs

Exchange of Books

*special problem

The Fraction

*special problem

Reformat the String

*special problem

Hammer throwing

*special problem

Chocolate Bar

*special problem, math

Symmetric Difference

*special problem

The Teacher of Physical Education

*special problem

Alyona and Triangles

geometry, two pointers

Alyona and Strings

dp, strings

Alyona and the Tree

dfs and similar, dp, graphs, trees

Runaway to a Shadow

geometry, sortings

Gifts by the List

constructive algorithms, dfs and similar, graphs, trees

Heap Operations

constructive algorithms, data structures, greedy

Bear and Bad Powers of 42

data structures

Bear and Chase

brute force, dfs and similar, graphs, implementation, math, probabilities

Bear and Square Grid

dfs and similar, dsu, implementation

Bear and Tower of Cubes

binary search, dp, greedy

Bear and Prime 100

constructive algorithms, interactive, math

Lena and Queries

data structures, divide and conquer, geometry

Another Sith Tournament

bitmasks, dp, math, probabilities

Iterated Linear Function

math, number theory

Joty and Chocolate

implementation, math, number theory

The Same Calendar

implementation

Vanya and Balloons

binary search, brute force, dp, implementation

Vanya and Treasure

data structures, dp, graphs, shortest paths

Vanya and Label

bitmasks, combinatorics, implementation, strings

Vanya and Food Processor

implementation, math