Lucky Number Representation

constructive algorithms, dfs and similar, dp

Inverse of Rows and Columns

brute force, constructive algorithms

Brain Network (hard)

trees

Students' Revenge

data structures, greedy, sortings

Huge Strings

bitmasks, brute force, dp, implementation, strings

Guard Duty (medium)

binary search, dp, greedy, sortings

Chemistry Experiment

binary search, data structures, ternary search

Arthur and Questions

greedy, implementation, math, ternary search

Excitation of Atoms

greedy, implementation

Vladik and chat

brute force, constructive algorithms, dp, implementation, strings

Snake

bitmasks, dfs and similar, graphs, implementation

Prairie Partition

binary search, constructive algorithms, greedy, math

George and Interesting Graph

graph matchings

Yet Another String Matching Problem

fft, math

Bath Queue

combinatorics, dp, probabilities

Prime Problem

number theory

Divisor Tree

brute force, number theory, trees

Lovely Matrix

dfs and similar, graphs, greedy, sortings

Dog Show

constructive algorithms, data structures, greedy

Bribes

dfs and similar, graphs, trees

Nastya Hasn't Written a Legend

binary search, data structures

Byteland, Berland and Disputed Cities

constructive algorithms, greedy

Deletion of Repeats

greedy, hashing, string suffix structures

Largest Beautiful Number

greedy, implementation

Drivers Dissatisfaction

data structures, dsu, graphs, trees

Valera and Fools

dfs and similar, dp, graphs, shortest paths

Shifting

implementation

Abbreviation

dp, hashing, strings

Ralph And His Tour in Binary Country

brute force, data structures, trees

Captains Mode

bitmasks, dp, games

Fancy Stack

combinatorics, dp, implementation

Alice the Fan

dp

Seating of Students

brute force, constructive algorithms, math

Hill Climbing

dfs and similar, geometry, trees

Mischievous Shooter

brute force, data structures, divide and conquer, dp, implementation

80-th Level Archeology

brute force, data structures, greedy, sortings

Free Market

dp, greedy

Package Delivery

data structures, divide and conquer, greedy

Dima and Horses

combinatorics, constructive algorithms, graphs

Bear and Polynomials

hashing, implementation, math

Almost Permutation

flows

Hospital Queue

binary search, graphs, greedy, implementation

Banquet Preparations 2

greedy, sortings, two pointers

Double Happiness

brute force, math, number theory

Songwriter

greedy, two pointers

Intellectual Inquiry

dp, greedy, strings

Tree Folding

dfs and similar, dp, greedy, implementation, trees

Vittorio Plays with LEGO Bricks

dp, geometry

Couple Cover

brute force, dp, number theory

Minibuses on Venus (easy version)

combinatorics, divide and conquer, dp

Swapping Characters

brute force, hashing, implementation, strings

Three Pieces

dfs and similar, dp, shortest paths

Gaining Rating

binary search, greedy, implementation, math, sortings, two pointers

Felicity's Big Secret Revealed

bitmasks, dp

Nikita and stack

data structures

Big Secret

constructive algorithms, math

Sereja and Table

bitmasks, greedy

Radio stations

binary search, data structures

Appleman and a Sheet of Paper

data structures, implementation

Network Safety

dfs and similar, dsu, graphs, math, sortings

Short Code

data structures, dp, greedy, strings, trees

Okabe and City

dfs and similar, graphs, shortest paths

Karen and Test

brute force, combinatorics, constructive algorithms, math

GCD of Polynomials

constructive algorithms, math

Arpa and a game with Mojtaba

bitmasks, dp, games

Brackets in Implications

constructive algorithms, greedy, implementation, math

Darth Vader and Tree

dp, matrices

Interactive Treasure Hunt

brute force, constructive algorithms, geometry, interactive, math

Vitaly and Advanced Useless Algorithms

dp, greedy, implementation

Funny Game

dp, games

Guess the Root

brute force, interactive, math

Compressed Tree

dfs and similar, dp, graphs, greedy, sortings, trees

Number Transformation II

greedy, math

Searching Rectangles

binary search, constructive algorithms, interactive

Kirill and Company

bitmasks, brute force, dfs and similar, dp, flows, graphs, shortest paths

Numerical Sequence (hard version)

binary search, math

Arson In Berland Forest

binary search, graphs, graphs, shortest paths

Division + LCP (hard version)

binary search, brute force, data structures, dp, hashing, math, string suffix structures, strings

Graph Coloring

dfs and similar, graphs

Divisors

brute force, dfs and similar, implementation, number theory

Serval and Snake

binary search, brute force, interactive

Glad to see you!

binary search, interactive

Gift

dsu, graphs, sortings, trees

Decypher the String

bitmasks, chinese remainder theorem, constructive algorithms, interactive, math

AND-MEX Walk

bitmasks, brute force, constructive algorithms, dfs and similar, dsu, graphs

Math

*special problem, math

Vladik and cards

binary search, bitmasks, brute force, dp

Trader Problem

data structures, dsu, greedy, sortings

A Heap of Heaps

brute force, data structures, math, sortings

Demiurges Play Again

dfs and similar, dp, math, trees

Jeff and Permutation

greedy

Vlad and Avoiding X

bitmasks, brute force, dfs and similar, dp, implementation

Banquet Preparations 1

greedy

AI robots

data structures

Monsters (hard version)

data structures, greedy

Arthur and Brackets

dp, greedy

Treeland Tour

data structures, dfs and similar, dp, trees

Little Pony and Summer Sun Celebration

constructive algorithms, dfs and similar, graphs

LaIS

data structures, dp, greedy

Serval and Shift-Shift-Shift

bitmasks, brute force, constructive algorithms, implementation