Tree Quiz

Swap Pass

constructive algorithms, geometry, sortings

RBS Deletion

*special problem, greedy

Oracle for f(x) = parity of the number of 1s in x

*special problem

Eleventh Birthday

combinatorics, dp, math

Defragmentation

implementation

Director

constructive algorithms, greedy

Michael and Hotel

binary search, interactive, trees

To Make 1

bitmasks, constructive algorithms, dp, greedy, number theory

And Yet Another Bracket Sequence

data structures, greedy, hashing, string suffix structures, strings

Bits of merry old England

flows, graphs

Petya and Tree

binary search, dfs and similar, probabilities, sortings, trees

Colour Vision

*special problem, implementation

Ancient Language

graphs, sortings

Place Your Ad Here

data structures, sortings

Random Function and Tree

combinatorics, dp, trees

Printer

binary search, data structures, implementation, sortings

Cows and Cool Sequences

dp, math, number theory

Colorado Potato Beetle

dfs and similar, implementation

Graph And Numbers

bitmasks, brute force, combinatorics, dp, meet-in-the-middle

Choosing Two Paths

dfs and similar, dp, greedy, trees

Этажи

constructive algorithms

Crisp String

bitmasks, dp

Raffles

data structures, dp, greedy, math

Nephren Runs a Cinema

chinese remainder theorem, combinatorics, math, number theory

Ants on a Circle

constructive algorithms, math

MEX counting

combinatorics, dp, implementation

More Reclamation

games

Gnikool Ssalg

*special problem, implementation, strings

Joy of Pokémon Observation

AND-permutations

constructive algorithms

Timofey and a flat tree

data structures, graphs, hashing, shortest paths, trees

Collective Mindsets (hard)

Sereja and Straight Lines

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

A+B

*special problem, implementation

Mod Mod Mod

binary search, dp, math

Move by Prime

combinatorics, math, number theory

Birthday

data structures, dfs and similar, dp, trees

Too Many Constraints

2-sat, constructive algorithms, graphs, implementation

Tree Queries

brute force, dp, trees

A New Beginning

data structures, dp, geometry, sortings

Falling Sand (Hard Version)

dfs and similar, dp, graphs, greedy

Neko Rules the Catniverse (Small Version)

bitmasks, dp, matrices

Parking Lot

data structures, divide and conquer

Serval and Brain Power

bitmasks, brute force, dp, greedy, implementation, strings

Dominoes

constructive algorithms, greedy

Game of Stacks

brute force, dfs and similar, graphs, implementation, trees

Number of Components

dsu, implementation

Make Symmetrical

brute force

Widget Library

dp, expression parsing, graphs, implementation

Battalion Strength

data structures, divide and conquer, probabilities

Two Friends

binary search, geometry

Keyboard Design

bitmasks, data structures, dp, string suffix structures, strings

Cartesian Tree

data structures

Politics

flows, graphs

Madoka and The First Session

constructive algorithms, flows, graph matchings, graphs, implementation

Concatenation with intersection

data structures, hashing, strings, two pointers

Triple

fft, math

Yet Another Maxflow Problem

data structures, flows, graphs

Mirror Box

geometry, implementation

Japanese Game

constructive algorithms, math

Virus

data structures, divide and conquer, dsu, graphs

Beautiful Matrix

combinatorics, data structures, dp

Perun, Ult!

brute force, greedy, sortings

Lost Array

bitmasks, combinatorics, constructive algorithms, dp, math

Distinguish I, CNOTs and SWAP

Julia the snail

data structures, divide and conquer, dp

Tokitsukaze and Beautiful Subsegments

data structures

Inna and Sweet Matrix

constructive algorithms

Summer Homework

data structures, math

A Shade of Moonlight

binary search, geometry, math, sortings, two pointers

The Next Good String

data structures, greedy, hashing, strings

Writing a Song

brute force, dp, strings

Mashtali and Hagh Trees

combinatorics, dp, trees

Wardrobe

dp, greedy

Limak and Shooting Points

brute force, geometry, math

Travelling Through the Snow Queen's Kingdom

bitmasks, brute force, divide and conquer, graphs

Crop Squares

constructive algorithms, geometry, interactive, math

Raging Thunder

data structures, divide and conquer, implementation

Coffee Varieties (easy version)

graphs, interactive

Cleaning Robots

dp, trees

Tree Cutting (Hard Version)

combinatorics, dfs and similar, dp, trees

Circles of Waiting

math

Fox And Polygon

constructive algorithms, divide and conquer

Matrix Rank (Hard Version)

combinatorics, dp, math, matrices, string suffix structures

Gang Up

flows, graphs

DFS

data structures

On a plane

*special problem, geometry

BRT Contract

data structures

Dreamoon and Binary

dp, strings

Context Advertising

dp, two pointers

Mister B and Flight to the Moon

constructive algorithms, graphs

Rats

brute force, dfs and similar, graphs, implementation, shortest paths

Color the Carpet

constructive algorithms

Neat Words

Tests Renumeration

greedy, implementation

Doremy's Perfect DS Class (Medium Version)

binary search, interactive

Formalism for Formalism

bitmasks, dp, math

Superhero's Job

dfs and similar, dp, hashing, math, number theory

Hamming Distance

constructive algorithms, greedy, math, matrices