Restore a Number

brute force, constructive algorithms, strings

Correct Bracket Sequence Editor

data structures, dsu, strings

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

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

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

Fence Divercity

combinatorics, dp, number theory

Polycarp and Hay

dfs and similar, dsu, graphs, greedy, sortings

You're a Professional

*special problem

Ace It!

*special problem

Out of Controls

*special problem

Rosetta Problem

*special problem

Without Text

*special problem

Scrambled

*special problem, implementation

Da Vinci Powers

*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

Bear and Up-Down

brute force, implementation

Ants on a Circle

constructive algorithms, math

Pursuit For Artifacts

dfs and similar, dsu, graphs, trees

Nested Segments

data structures, sortings

Foe Pairs

combinatorics, sortings, two pointers

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

Image Preview

binary search, brute force, dp, two pointers

Автобус

binary search, data structures, greedy, sortings

Собери число

graphs, shortest paths

Собачки и миски

data structures, greedy, sortings

Armistice Area Apportionment

binary search, geometry

Cowslip Collections

combinatorics, math, number theory

Intellectual Inquiry

dp, greedy, strings

Robot Rapping Results Report

binary search, dp, graphs

Hostname Aliases

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

Processing Queries

*special problem, constructive algorithms, data structures, two pointers

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

Little Artem and Dance

brute force, constructive algorithms, implementation

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

Three-dimensional Turtle Super Computer

brute force, dfs and similar, graphs

Road Improvement

*special problem, dfs and similar, graphs, greedy, trees

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

Spy Syndrome 2

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

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

The Smallest String Concatenation

sortings, strings

Product Sum

data structures, dp, geometry

Messenger

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

Report

data structures, sortings

Pyramids

geometry, math

Area of a Star

geometry

Arrow

geometry

Turn

geometry, math

Parking Lot

combinatorics, math

A rectangle

math

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