Prefix Flip (Hard Version)

constructive algorithms, data structures, implementation, strings, two pointers

Flipper

brute force, constructive algorithms, greedy

Longest Regular Bracket Sequence

constructive algorithms, data structures, dp, greedy, sortings, strings

Twist the Permutation

brute force, constructive algorithms, implementation, math

Ehab and Prefix MEXs

brute force, constructive algorithms, greedy

Divisor Chain

bitmasks, constructive algorithms, math, number theory

Gardener and the Array

bitmasks, constructive algorithms

Restoring the Permutation

constructive algorithms, implementation

Carousel

constructive algorithms, dp, graphs, greedy, math

Klever Permutation

constructive algorithms, math, two pointers

Palindromifier

constructive algorithms, strings

Increasing Sequence

constructive algorithms, implementation, math

Did We Get Everything Covered?

constructive algorithms, dp, greedy, shortest paths, strings

Bear and Prime 100

constructive algorithms, interactive, math

Circle Coloring

constructive algorithms

Madoka and Childish Pranks

constructive algorithms, greedy

No More Inversions

constructive algorithms, math

Permutation Operations

constructive algorithms, greedy, implementation, math

Bessie and MEX

constructive algorithms, math

Insert and Equalize

brute force, constructive algorithms, greedy, math, number theory

Tile Painting

constructive algorithms, math, number theory

Array Destruction

brute force, constructive algorithms, data structures, greedy, implementation, sortings

Unforgivable Curse (easy version)

brute force, constructive algorithms, dsu, graphs, greedy, strings

Bear and Five Cards

constructive algorithms, implementation

Unforgivable Curse (hard version)

brute force, constructive algorithms, dfs and similar, dsu, graphs, greedy, strings

Qingshan Loves Strings 2

constructive algorithms, greedy, implementation

Jumping Through Segments

binary search, constructive algorithms

Exam

constructive algorithms, implementation, math

Column Swapping

brute force, constructive algorithms, greedy, implementation, sortings

Lord of the Values

constructive algorithms

Sum on Subarrays

constructive algorithms, greedy, math

Omkar and Heavenly Tree

constructive algorithms, trees

Definite Game

constructive algorithms, math

Spy-string

bitmasks, brute force, constructive algorithms, dp, hashing, strings

Vladik and fractions

brute force, constructive algorithms, math, number theory

Rectangle Filling

constructive algorithms, implementation

Ehab and a Special Coloring Problem

constructive algorithms, number theory

ABBC or BACB

constructive algorithms, greedy

Say No to Palindromes

brute force, constructive algorithms, dp, strings

Row Major

constructive algorithms, greedy, math, number theory, strings

Dishonest Sellers

constructive algorithms, greedy, sortings

Timofey and cubes

constructive algorithms, implementation

Knights

constructive algorithms, greedy

Coloring

constructive algorithms, greedy, math

Ehab the Xorcist

bitmasks, constructive algorithms, greedy, number theory

Ice and Fire

constructive algorithms, dp, greedy

Baby Ehab Partitions Again

bitmasks, constructive algorithms, dp, math

Nastya Is Playing Computer Games

constructive algorithms, math

StORage room

bitmasks, brute force, constructive algorithms, greedy

Build the Permutation

constructive algorithms, greedy

Chocolate Bunny

constructive algorithms, interactive, math, two pointers

New Year's Eve

bitmasks, constructive algorithms, number theory

Insert Zero and Invert Prefix

constructive algorithms

Kuroni and Simple Strings

constructive algorithms, greedy, strings, two pointers

Smilo and Monsters

binary search, constructive algorithms, greedy, sortings, two pointers

Fishingprince Plays With Array

constructive algorithms, greedy, implementation, math

Fence Painting

brute force, constructive algorithms, greedy

Soldier and Number Game

constructive algorithms, dp, math, number theory

All the Vowels Please

constructive algorithms, math, number theory

Fill in the Matrix

constructive algorithms, implementation

Dice Tower

constructive algorithms, greedy

Min Cost String

brute force, constructive algorithms, graphs, greedy, strings

Binary String Constructing

constructive algorithms

Diameter of Graph

constructive algorithms, graphs, greedy, math

String Modification

brute force, constructive algorithms, implementation, sortings, strings

Squares and Segments

binary search, constructive algorithms, math

Packets

constructive algorithms, greedy, math

Stoned Game

brute force, constructive algorithms, games, greedy

Smaller

constructive algorithms, greedy, strings

Valera and Tubes

constructive algorithms, dfs and similar, implementation

Vladik and flights

constructive algorithms, greedy, implementation

Nene's Magical Matrix

constructive algorithms, greedy, math

Equalize by Divide

brute force, constructive algorithms, greedy, math

Swap Letters

constructive algorithms, greedy

Vasya and Isolated Vertices

constructive algorithms, graphs

Add, Divide and Floor

constructive algorithms, greedy, math

Bits

bitmasks, constructive algorithms

Dima and a Bad XOR

bitmasks, brute force, constructive algorithms, dp

Bit Flipping

bitmasks, constructive algorithms, greedy, strings

Color the Picture

constructive algorithms, greedy, math

Escape from Stones

constructive algorithms, data structures, implementation, two pointers

Salyg1n and the MEX Game

constructive algorithms, data structures, games, greedy, interactive

Bricks and Bags

constructive algorithms, games, greedy, sortings

New Year and the Treasure Geolocation

brute force, constructive algorithms, greedy, implementation

Helping the Nature

constructive algorithms, data structures, greedy

Theofanis' Nightmare

constructive algorithms, greedy

Even-Odd XOR

bitmasks, constructive algorithms, greedy

Pinkie Pie Eats Patty-cakes

constructive algorithms, greedy, math, sortings

An abandoned sentiment from past

constructive algorithms, greedy, implementation, sortings

Oh Those Palindromes

constructive algorithms, strings

Search in Parallel

constructive algorithms, greedy, sortings

Engineer Artem

2-sat, chinese remainder theorem, constructive algorithms, fft, flows

Vupsen, Pupsen and 0

constructive algorithms, math

Palindromic Supersequence

constructive algorithms

War of the Corporations

constructive algorithms, greedy, strings

Splitting in Teams

constructive algorithms, greedy, math

Equalize Them All

constructive algorithms, greedy

Shell Game

constructive algorithms, implementation, math

Valued Keys

constructive algorithms, greedy, strings

Heavy Intervals

constructive algorithms, data structures, dsu, greedy, math, sortings