Little Elephant and Strings

data structures, implementation, string suffix structures, two pointers

Three Days Grace

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

Permutation and Queries

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

Controversial Rounds

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

New Passenger Trams

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

Two Arrays

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

Polycarp and the Language of Gods

*special problem, implementation, two pointers

Array Equalizer

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

Crossword Expert

combinatorics, dp, number theory, probabilities, two pointers

Flip the Cards

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

Omkar and Last Floor

dp, greedy, two pointers

Group Photo

binary search, data structures, implementation, two pointers

Social Network

greedy, two pointers

Velepin and Marketing

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

Aquarium decoration

data structures, greedy, two pointers

Choosing Subtree is Fun

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

Lottery

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

Mercenaries

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

Reading Books (hard version)

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

Building Bridge

geometry, ternary search, two pointers

Enormous XOR

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

Sleep in Class

constructive algorithms, data structures, math, two pointers

Zublicanes and Mumocrates

dp, trees, two pointers

Diverse Segments

data structures, two pointers

Balancing Weapons

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

Split

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

Lexichromatography

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

Table with Letters - 2

brute force, two pointers

Bear and Contribution

data structures, greedy, sortings, two pointers

Matrix Sorting

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

DZY Loves Strings

binary search, hashing, strings, two pointers

Diverse Substrings

dp, strings, two pointers

Interesting Sections

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

Music in Car

data structures, greedy, two pointers

Attack on Red Kingdom

games, two pointers

Discarding Game

dp, greedy, two pointers

Chips on a Board

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

Very simple problem

geometry, two pointers

Mashmokh and Water Tanks

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

Edo and Magnets

brute force, greedy, implementation, two pointers

Imagination Castle

dp, games, two pointers

Hossam and a Letter

brute force, dp, implementation, two pointers

Volcanoes

binary search, implementation, sortings, two pointers

Alyona and Triangles

geometry, two pointers

Weights

constructive algorithms, greedy, two pointers

Present to Mom

binary search, two pointers

Misha and Apples

brute force, data structures, dp, two pointers

Baby Ehab's Hyper Apartment

binary search, graphs, interactive, 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

Lucky Tickets

binary search, data structures, sortings, two pointers

Conveyor

sortings, two pointers

Orchestra

two pointers

Empty Rectangles

divide and conquer, two pointers

Minimum Difference

data structures, hashing, sortings, two pointers

Concatenation with intersection

data structures, hashing, strings, 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

Context Advertising

dp, two pointers

Mice

greedy, two pointers

Monocarp and a Strategic Game

geometry, sortings, two pointers

Ratings and Reality Shows

data structures, two pointers

Cyclic Cipher

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

Morning run

binary search, math, two pointers

Ancient Berland Hieroglyphs

two pointers

The Majestic Brown Tree Snake

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

Long Way to be Non-decreasing

binary search, dfs and similar, graphs, implementation, shortest paths, two pointers

Yet Another Partiton Problem

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

Intervals of Intervals

binary search, data structures, two pointers

New Year and Cake

geometry, two pointers

Illumination

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

Bitwise Paradox

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

Tiles for Bathroom

data structures, sortings, two pointers

Colorful Stones

dp, two pointers

Maxim and Calculator

brute force, dp, two pointers

Most Dangerous Shark

data structures, dp, two pointers

Race

brute force, implementation, two pointers

Equal Product

data structures, math, number theory, two pointers

Twilight and Ancient Scroll (harder version)

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

Shoe Store

dp, graph matchings, greedy, sortings, two pointers

Survival of the Weakest (hard version)

greedy, math, sortings, two pointers

Amanda the Amoeba

graphs, implementation, trees, two pointers

Gates to Another World

bitmasks, data structures, dsu, two pointers

Archer's Shot

binary search, geometry, math, two pointers

Rainbow Rectangles

data structures, sortings, two pointers

Strange Permutation

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

MCMF?

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

The Potion of Great Power

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

Transportation

greedy, sortings, two pointers

More Gifts

*special problem, dfs and similar, two pointers

I Might Be Wrong

binary search, greedy, two pointers

Lucky Segments

binary search, implementation, two pointers

Jumping Through the Array

binary search, data structures, graphs, two pointers

Galaxy Union

dp, trees, two pointers

MEX Game 2 (Hard Version)

binary search, greedy, two pointers

Ksusha and Square

geometry, math, probabilities, two pointers

Hamming Triples

implementation, math, two pointers

Significant Cups

*special problem, binary search, data structures, two pointers

BCPC

binary search, geometry, two pointers

Cubes

data structures, dp, geometry, two pointers