Kay and Eternity

brute force, implementation, sortings

Optimal Point

binary search, math

The Hero with Bombs

*special problem

Loader

*special problem, graphs

Alyona and Triangles

geometry, two pointers

Runaway to a Shadow

geometry, sortings

Gifts by the List

constructive algorithms, dfs and similar, graphs, trees

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

Lena and Queries

data structures, divide and conquer, geometry

Another Sith Tournament

bitmasks, dp, math, probabilities

Vanya and Balloons

binary search, brute force, dp, implementation

Vanya and Treasure

data structures, dp, graphs, shortest paths

The Last Fight Between Human and AI

math

Theseus and labyrinth

graphs, implementation, shortest paths

Trains and Statistic

data structures, dp, greedy

Money Transfers

constructive algorithms, data structures, greedy, sortings

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

Restore a Number

brute force, constructive algorithms, strings

Forensic Examination

data structures, string suffix structures

Chain Reaction

brute force, geometry

Codeword

combinatorics, strings

World Tour

graphs, shortest paths

Four Divisors

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

Beautiful Subarrays

data structures, divide and conquer, strings, trees

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

Divisibility Check

*special problem

Maximal Difference

*special problem

Array Sum

*special problem

Bear and Bowling 4

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

Different Subsets For All Tuples

combinatorics, math

Fence Divercity

combinatorics, dp, number theory

Polycarp and Hay

dfs and similar, dsu, graphs, greedy, sortings

Out of Controls

*special problem

Rosetta Problem

*special problem

Without Text

*special problem

Move by Prime

combinatorics, math, number theory

Paper task

data structures, string suffix structures, strings

Bear and Forgotten Tree 2

dfs and similar, dsu, graphs, trees

Delivery Bears

binary search, flows, graphs

Ants on a Circle

constructive algorithms, math

Pursuit For Artifacts

dfs and similar, dsu, graphs, trees

Clockwork Bomb

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

Zip-line

binary search, data structures, dp, hashing

Table Compression

dfs and similar, dp, dsu, graphs, greedy

Автобус

binary search, data structures, greedy, sortings

Собери число

graphs, shortest paths

Armistice Area Apportionment

binary search, geometry

Cowslip Collections

combinatorics, math, number theory

Intellectual Inquiry

dp, greedy, strings

Hostname Aliases

*special problem, binary search, data structures, implementation, sortings, strings

Choosing Ads

data structures

Bears and Juice

dp, math, meet-in-the-middle

Bear and Destroying Subtrees

dp, math, probabilities, trees

Bearish Fanpages

Levels and Regions

dp

Little Artem and Graph

Little Artem and 2-SAT

Little Artem and Time Machine

data structures

Little Artem and Random Variable

dp, implementation, math, probabilities

Bear and Chemistry

data structures, dfs and similar, graphs, trees

Bear and Paradox

binary search, greedy, math, sortings

Bear and Contribution

data structures, greedy, sortings, two pointers

Bear and Polynomials

hashing, implementation, math

Fibonacci-ish II

data structures, implementation

Yash And Trees

bitmasks, data structures, dfs and similar, math, number theory

The Chocolate Spree

dfs and similar, dp, graphs, trees

Startup Funding

binary search, constructive algorithms, data structures, probabilities, two pointers

Fibonacci-ish

brute force, dp, hashing, implementation, math

Magic Matrix

brute force, divide and conquer, graphs, matrices, trees

Thief in a Shop

divide and conquer, dp, fft, math

Longest Subsequence

brute force, math, number theory

Product Sum

data structures, dp, geometry

Messenger

data structures, hashing, implementation, string suffix structures, strings

Area of a Star

geometry

Arrow

geometry

Famil Door and Roads

combinatorics, data structures, dfs and similar, dp, probabilities, trees

Babaei and Birthday Cake

data structures, dp

Famil Door and Brackets

dp, strings

Bear and Fair Set

flows, graphs

Zbazi in Zeydabad

data structures, implementation

Magic Numbers

dp

Island Puzzle

dfs and similar, dsu, graphs, trees

Orchestra

two pointers

Preorder Test

binary search, dfs and similar, dp, graphs, greedy, trees

Package Delivery

data structures, divide and conquer, greedy

Raffles

data structures, dp, greedy, math

Group Projects

dp

Simple Skewness

binary search, math, ternary search