Toys

brute force, combinatorics

Test Data Generation

combinatorics, divide and conquer, dp, fft, math, number theory

Little Artem and 2-SAT

Array Sorting

*special problem

The Meeting Place Cannot Be Changed

dfs and similar, graphs

A Preponderant Reunion

constructive algorithms, dp

Weird LCM Operations

brute force, constructive algorithms, number theory

Connected Cubes

constructive algorithms, games

Игра в Девятку II

*special problem, brute force

Hero to Zero

graph matchings, math

Graph Coloring

data structures, graphs, interactive

Hammer throwing

*special problem

Kojiro and Furrari

dp, greedy

Privatization

flows, graphs

Vacuum Сleaner

geometry

Imitating the Key Tree

combinatorics, dsu, trees

Divide The Students

brute force

Double Permutation Inc.

*special problem, binary search, greedy

New Year and Snowy Grid

dfs and similar, dsu, graphs, interactive

Marek and Matching (hard version)

brute force, probabilities

Marek and Matching (easy version)

brute force, probabilities

Planar Graph

flows, geometry, graphs

Baldman and the military

dfs and similar, graphs, trees

Power of quantum Fourier transform

Wizards and Roads

data structures, divide and conquer, graph matchings, graphs, greedy

School Clubs

dp, fft, math, number theory, probabilities

Mashmokh's Designed Problem

data structures

Cactus to Tree

dp, graphs, trees

Chessboard

*special problem

Two Circles

brute force, data structures, implementation

Script Generation

Flow Control

data structures, dsu, implementation

Minecraft Series

brute force, two pointers

Two Posters

brute force, data structures, greedy, two pointers

Power Substring

math, number theory

Kirchhoff's Current Loss

math

Recover Polygon (medium)

geometry

Factorial zeros

*special problem

Stairs

combinatorics, divide and conquer, dp, fft, math

Block unitary

*special problem

Euler tour

constructive algorithms, trees

HQ

*special problem, constructive algorithms

New Year and the Factorisation Collaboration

interactive, math, number theory

Mahmoud and Ehab and the final stage

data structures, strings

Anti-median (Easy Version)

dp, math

Star Trek

*special problem, combinatorics, dfs and similar, dp, games, graphs, matrices, trees

X-wing fighter

The Beaver's Problem - 2

Modernization of Treeland

*special problem, dfs and similar, trees

Another array reconstruction algorithm

Harry Vs Voldemort

dfs and similar, dp, graphs, trees

Escaping on Beaveractor

dfs and similar, implementation

Sequence Transformation

brute force, data structures, dp, implementation, math

Min-Fund Prison (Hard)

bitmasks, dfs and similar, dp, graphs, trees

Journey

data structures, divide and conquer, graphs, trees

Mages and Monsters

data structures, geometry

MEX Tree Manipulation

data structures, trees

Days of Floral Colours

combinatorics, divide and conquer, dp, fft, math

Two Rooted Trees

data structures, implementation, trees

Supercollider

brute force

Yet Another Permutation Constructive

*special problem, constructive algorithms

MEXanization

data structures

Codeforces Scoreboard

binary search, data structures, dp, geometry

Eligible Segments

geometry

Cowboy Beblop at his computer

geometry

Old Mobile

combinatorics, dp, probabilities

Kevin and Grid

fft, graphs, math

Beaver's Calculator 1.0

greedy

Six Characters

*special problem, constructive algorithms, strings

Special Positions

combinatorics, divide and conquer, fft, math

Cactus Not Enough

dfs and similar, graph matchings, graphs

Mister B and Beacons on Field

number theory

Thanos Snap

binary search, dp, games, greedy, trees

Palindromic Doubles

*special problem, data structures, dp

Big Number and Remainder

*special problem, math, number theory

Wavy numbers

brute force, dfs and similar, meet-in-the-middle, sortings

DevOps Best Practices

constructive algorithms

Endless Roses Most Beautiful

Tree and Array

constructive algorithms

Bakery

data structures, dsu

BCPC

binary search, geometry, two pointers

Cubes

data structures, dp, geometry, two pointers

Evidence Board

*special problem, constructive algorithms, dfs and similar, graphs, trees

Sophisticated Device

constructive algorithms

Three Arrays

data structures

Training Camp

flows, graphs

"Is the number divisible by 3?" oracle

"Is the bit string balanced?" oracle

Tree

fft, graphs, trees

Party

bitmasks, brute force, graph matchings

Digital Patterns

combinatorics, data structures, implementation, math

Binary String Partition

*special problem, binary search, greedy

Subset Trick

binary search, data structures

Sweep Line

combinatorics, games, math

Playing the ball

geometry

Alternating case

*special problem

Unique Strings

combinatorics, dp, math

OH NO1 (-2-3-4)

constructive algorithms, graphs, math

Fedya the Potter

binary search, implementation, math, number theory

Caramel Clouds

data structures, dp, sortings