Good Subarrays (Hard Version)

binary search, data structures, dp, two pointers

Long Permutation

brute force, math, two pointers

Name That Tune

dp, probabilities, two pointers

Permutation and Queries

brute force, data structures, divide and conquer, two pointers

Array Equalizer

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

Crossword Expert

combinatorics, dp, number theory, probabilities, two pointers

Sleep in Class

constructive algorithms, data structures, math, two pointers

Zublicanes and Mumocrates

dp, trees, two pointers

Bear and Contribution

data structures, greedy, sortings, two pointers

Four Divisors

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

Startup Funding

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

Ratings and Reality Shows

data structures, two pointers

The Potion of Great Power

*special problem, 2-sat, binary search, data structures, graphs, interactive, sortings, two pointers

Mocha and Diana (Hard Version)

brute force, constructive algorithms, dfs and similar, dsu, graphs, greedy, trees, two pointers

Xor of 3

brute force, constructive algorithms, greedy, two pointers

AND Segments

bitmasks, combinatorics, data structures, dp, two pointers

Square-free division (hard version)

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

Two Editorials

brute force, dp, greedy, sortings, two pointers

Three Occurrences

data structures, divide and conquer, hashing, two pointers

Stringforces

binary search, bitmasks, brute force, dp, strings, two pointers

MinimizOR

bitmasks, brute force, data structures, divide and conquer, greedy, implementation, two pointers

Mastermind

constructive algorithms, graph matchings, greedy, implementation, sortings, two pointers

Yurii Can Do Everything

binary search, bitmasks, brute force, constructive algorithms, divide and conquer, two pointers

LCM Sum (hard version)

brute force, data structures, math, number theory, two pointers

Controversial Rounds

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

Group Photo

binary search, data structures, implementation, two pointers

Aquarium decoration

data structures, greedy, two pointers

Lottery

binary search, brute force, greedy, math, two pointers

Reading Books (hard version)

data structures, greedy, implementation, sortings, ternary search, two pointers

Balancing Weapons

binary search, brute force, data structures, math, two pointers

Lexichromatography

combinatorics, dfs and similar, dsu, graphs, two pointers

DZY Loves Strings

binary search, hashing, strings, two pointers

Attack on Red Kingdom

games, two pointers

Very simple problem

geometry, two pointers

Hossam and a Letter

brute force, dp, implementation, two pointers

Volcanoes

binary search, implementation, sortings, two pointers

Sereja and Straight Lines

binary search, data structures, geometry, sortings, two pointers

A Shade of Moonlight

binary search, geometry, math, sortings, two pointers

Colorful Stones

dp, two pointers

Shoe Store

dp, graph matchings, greedy, sortings, two pointers

Lucky Segments

binary search, implementation, two pointers

Emotional Fishermen

combinatorics, dp, math, two pointers

Three Days Grace

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

Flip the Cards

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

Velepin and Marketing

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

Choosing Subtree is Fun

binary search, data structures, dfs and similar, trees, two pointers

Mercenaries

bitmasks, brute force, combinatorics, dp, dsu, math, two pointers

Enormous XOR

bitmasks, constructive algorithms, greedy, math, strings, two pointers

Diverse Segments

data structures, two pointers

Matrix Sorting

bitmasks, brute force, constructive algorithms, greedy, two pointers

Alyona and Triangles

geometry, two pointers

Weights

constructive algorithms, greedy, two pointers

Amanda the Amoeba

graphs, implementation, trees, two pointers

Rogue-like Game

*special problem, brute force, greedy, two pointers

Two Arrays

bitmasks, brute force, combinatorics, greedy, hashing, math, two pointers

Split

binary search, data structures, divide and conquer, dsu, math, trees, two pointers

Chips on a Board

bitmasks, brute force, data structures, dp, games, two pointers

Baby Ehab's Hyper Apartment

binary search, graphs, interactive, sortings, two pointers

Concatenation with intersection

data structures, hashing, strings, two pointers

Monocarp and a Strategic Game

geometry, sortings, two pointers

Illumination

binary search, bitmasks, brute force, combinatorics, dp, math, two pointers

Most Dangerous Shark

data structures, dp, two pointers

MCMF?

data structures, flows, graphs, greedy, sortings, two pointers

Galaxy Union

dp, trees, two pointers

Ksusha and Square

geometry, math, probabilities, two pointers

BCPC

binary search, geometry, two pointers

Cubes

data structures, dp, geometry, two pointers

Drazil and Morning Exercise

dfs and similar, dp, dsu, trees, two pointers

Little Elephant and Strings

data structures, implementation, string suffix structures, two pointers

Interesting Sections

data structures, divide and conquer, meet-in-the-middle, two pointers

Misha and Apples

brute force, data structures, dp, two pointers

Cyclic Cipher

chinese remainder theorem, data structures, implementation, number theory, two pointers

Maxim and Calculator

brute force, dp, two pointers

Hamming Triples

implementation, math, two pointers

Omkar and Last Floor

dp, greedy, two pointers

New Year and Cake

geometry, two pointers

Tiles for Bathroom

data structures, sortings, two pointers

Hellish Constraints

brute force, dp, two pointers

Landscaping

binary search, geometry, two pointers

Double Knapsack

constructive algorithms, two pointers

Frequency Problem (Hard Version)

data structures, greedy, two pointers

Empty Rectangles

divide and conquer, two pointers

Orchestra

two pointers

The Majestic Brown Tree Snake

dfs and similar, dp, greedy, trees, two pointers

Yet Another Partiton Problem

data structures, divide and conquer, dp, geometry, two pointers

Equal Product

data structures, math, number theory, two pointers

Minimum Difference

data structures, hashing, sortings, two pointers

Bitwise Paradox

binary search, bitmasks, data structures, greedy, two pointers

Survival of the Weakest (hard version)

greedy, math, sortings, two pointers

Intranet of Buses

binary search, geometry, implementation, two pointers

Twilight and Ancient Scroll (harder version)

dp, hashing, implementation, string suffix structures, strings, two pointers

Strange Permutation

binary search, combinatorics, data structures, dp, graphs, implementation, two pointers

Two Posters

brute force, data structures, greedy, two pointers

Hongcow Masters the Cyclic Shift

strings, two pointers

Gates to Another World

bitmasks, data structures, dsu, two pointers

Rainbow Rectangles

data structures, sortings, two pointers

MEX Game 2 (Hard Version)

binary search, greedy, two pointers

...Dary!

binary search, geometry, two pointers

Bear and Isomorphic Points

geometry, two pointers

Innovative Washing Machine

geometry, math, two pointers