Alyona and Triangles

geometry, two pointers

Alyona and Strings

dp, strings

Alyona and the Tree

dfs and similar, dp, graphs, trees

Alyona and Mex

sortings

Alyona and Numbers

constructive algorithms, math, number theory

Runaway to a Shadow

geometry, sortings

Gifts by the List

constructive algorithms, dfs and similar, graphs, trees

Heap Operations

constructive algorithms, data structures, greedy

Economy Game

brute force

A Good Contest

implementation

Bear and Finding Criminals

constructive algorithms, implementation

Bear and Five Cards

constructive algorithms, implementation

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

Johny Likes Numbers

implementation, math

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

Vanya and Fence

implementation

The Last Fight Between Human and AI

math

Theseus and labyrinth

graphs, implementation, shortest paths

Vasya and String

binary search, dp, strings, two pointers

Pyramid of Glasses

implementation, math, math

Nicholas and Permutation

constructive algorithms, implementation

Trains and Statistic

data structures, dp, greedy

Tree Construction

data structures, trees

Money Transfers

constructive algorithms, data structures, greedy, sortings

Restoring Painting

brute force, constructive algorithms, math

Infinite Sequence

math

Problems for Round

greedy, implementation

Bear and Game

implementation

Different is Good

constructive algorithms, implementation, strings

Summer Camp

implementation

Organizing a Race

data structures, greedy

Roads in Yusland

data structures, dp, greedy

Ultimate Weirdness of an Array

data structures, number theory

Robin Hood

binary search, greedy

Recycling Bottles

dp, geometry, greedy, implementation

Restore a Number

brute force, constructive algorithms, strings

Correct Bracket Sequence Editor

data structures, dsu, strings

Magic Powder - 2

binary search, implementation

Magic Powder - 1

binary search, brute force, implementation

Cinema

implementation, sortings

Game of Robots

implementation

Holidays

brute force, constructive algorithms, greedy, math

Little Artem and Presents

math

Coat of Anticubism

constructive algorithms, geometry

Pouring Rain

geometry, math

Forensic Examination

data structures, string suffix structures

Chain Reaction

brute force, geometry

Codeword

combinatorics, strings

World Tour

graphs, shortest paths

Reberland Linguistics

dp, implementation, strings

Four Divisors

data structures, dp, math, number theory, sortings, two pointers

Beautiful Subarrays

data structures, divide and conquer, strings, trees

Simple Subset

constructive algorithms, greedy, number theory

Simple Strings

dp, greedy, strings

Shopping

brute force

Buses Between Cities

implementation

Complicated GCD

math, number theory

Rebus

constructive algorithms, expression parsing, greedy, math

To Hack or not to Hack

brute force, dp, greedy

International Olympiad

constructive algorithms, greedy, implementation, math

Binary Table

bitmasks, brute force, divide and conquer, dp, fft, math

Graph Coloring

dfs and similar, graphs

Gambling Nim

bitmasks, math, matrices, probabilities

Rotate Matrix

*special problem

Hungarian Notation

*special problem

Primes in Interval

*special problem

Divisibility Check

*special problem

Maximal Difference

*special problem

Array Sum

*special problem

Seasons

*special problem

Lazy Caterer Sequence

*special problem

Bear and Bowling 4

binary search, data structures, divide and conquer, geometry, ternary search

Different Subsets For All Tuples

combinatorics, math

Number of Parallelograms

geometry

Hard Process

binary search, dp, two pointers

Seating On Bus

implementation

Co-prime Array

greedy, implementation, math, number theory

Fence Divercity

combinatorics, dp, number theory

Polycarp and Hay

dfs and similar, dsu, graphs, greedy, sortings

New Reform

data structures, dfs and similar, dsu, graphs, greedy

Bicycle Race

geometry, implementation, math

Tanya and Toys

greedy, implementation

Qualifying Contest

constructive algorithms, sortings

Round House

implementation, math

Bear and Reverse Radewoosh

implementation

You're a Professional

*special problem

Ace It!

*special problem

Out of Controls

*special problem