Flip the Cards

2-sat, constructive algorithms, data structures, greedy, sortings, two pointers

Flip and Reverse

data structures, graphs, greedy

Crossword Expert

combinatorics, dp, number theory, probabilities, two pointers

Blocked Points

math

Rectangle Painting 2

flows, graph matchings, graphs

Hexagons

binary search, implementation, math

2..3...4.... Wonderful! Wonderful!

combinatorics, dp, math

Alice, Bob, Oranges and Apples

number theory

Boring Queries

data structures, math, number theory

Omkar and Last Floor

dp, greedy, two pointers

Rat Kwesh and Cheese

brute force, constructive algorithms, math

Mathematics Curriculum

brute force, combinatorics, dp, trees

Good Contest

combinatorics, dp, probabilities

Crunching Numbers Just for You

*special problem, implementation

The World Is Just a Programming Task (Hard Version)

implementation

Embassy Queue

data structures, greedy

Parking Lot

data structures, implementation

Antennas

data structures, dfs and similar, graphs, graphs, implementation, implementation, shortest paths, shortest paths

Yet Another String Matching Problem

fft, math

Madoka and the Sixth-graders

data structures, dfs and similar, greedy

Spiral Maximum

brute force, dp

Not Same

constructive algorithms

Maximum Matching

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

Bear and Drawing

constructive algorithms, dfs and similar, trees

George and Interesting Graph

graph matchings

Factorization

*special problem, number theory

Security

data structures, string suffix structures

Curious Array

brute force, combinatorics, implementation, math

Two Melodies

dp, flows

Paper task

data structures, string suffix structures, strings

Fence Divercity

combinatorics, dp, number theory

Hossam and Range Minimum Query

binary search, bitmasks, data structures, hashing, probabilities, strings, trees

Group Photo

binary search, data structures, implementation, two pointers

Greedy Subsequences

data structures, dp, trees

Adam and Tree

data structures, trees

The table

constructive algorithms, greedy

Chessboard Billiard

dfs and similar, dsu, graphs, number theory

Two Permutations (Easy Version)

brute force, constructive algorithms, greedy, number theory

Wooden Spoon

combinatorics, dp

Indie Album

data structures, dfs and similar, hashing, string suffix structures, strings, trees

Exploration plan

binary search, flows, graph matchings, shortest paths

Change-free

greedy

Optimize!

data structures

Odd Mineral Resource

binary search, bitmasks, brute force, data structures, probabilities, trees

Résumé Review

binary search, greedy, math

The Cake Is a Lie

constructive algorithms, data structures, dfs and similar, graphs

Lunar New Year and a Recursive Sequence

math, matrices, number theory

Bicolored Segments

data structures, dp, graph matchings, sortings

Mean Requests

*special problem, implementation

Social Network

greedy, two pointers

Rosetta Problem

*special problem

Bags and Coins

bitmasks, constructive algorithms, dp, greedy

Death DBMS

data structures, string suffix structures, strings, trees

Kuroni and Antihype

bitmasks, brute force, dp, dsu, graphs

Prairie Partition

binary search, constructive algorithms, greedy, math

Password

bitmasks, dp, shortest paths

Isolation

data structures, dp

Neko and Flashback

constructive algorithms, dfs and similar, graphs

Inna and Binary Logic

binary search, bitmasks, data structures

Russian Roulette

constructive algorithms, greedy

Field Photography

bitmasks, data structures, sortings

Maximum Reduction

combinatorics, data structures, math

Vasily the Bear and Beautiful Strings

combinatorics, math, number theory

Fox And Travelling

dp, trees

Подкрутка I

*special problem, brute force, dp, greedy

Heidi Learns Hashing (Medium)

brute force, number theory

Splitting the Uniqueness

constructive algorithms

Positions in Permutations

combinatorics, dp, math

Dot

dp, games

Good Substrings

hashing, strings

Beautiful IP Addresses

brute force

Twin Clusters

bitmasks, brute force, constructive algorithms, math, probabilities

Distance Tree (hard version)

binary search, dfs and similar, shortest paths, trees

Points Movement

data structures, dp, greedy, implementation, sortings

Anti-Palindromize

flows, graphs, greedy

Rest In The Shades

binary search, geometry

Student's Camp

dp, math

Recover Polygon (easy)

Top-Notch Insertions

combinatorics, data structures

Phoenix and Odometers

dfs and similar, graphs, math, number theory

Pave the Parallelepiped

bitmasks, brute force, combinatorics, math, number theory

Little Elephant and Shifts

data structures

Game of chess unfinished

implementation

Colouring Game

constructive algorithms, dp, games

Game with Cards

binary search, constructive algorithms, data structures, dp, greedy, implementation

Clusterization Counting

combinatorics, dp, dsu, fft, graphs, trees

Professor's task

data structures, geometry

Miss Punyverse

dp, greedy, trees

Comb

data structures, dp

Velepin and Marketing

binary search, data structures, dp, greedy, sortings, two pointers

Cycling City

dfs and similar, graphs

Jee, You See?

bitmasks, combinatorics, dp

Destroy the Colony

combinatorics, dp, math

Zigu Zagu

constructive algorithms, data structures, greedy

Cards

constructive algorithms, implementation

Maximize The Value

data structures, sortings

Tenzing and Random Operations

combinatorics, dp, math, probabilities

Similar Polynomials

combinatorics, math

Secure Password

bitmasks, combinatorics, constructive algorithms, interactive, math

Aquarium decoration

data structures, greedy, two pointers