Stock Exchange

binary search, flows, graphs

Endless Roses Most Beautiful

Big Number and Remainder

*special problem, math, number theory

Mister B and Beacons on Field

number theory

Cactus Not Enough

dfs and similar, graph matchings, graphs

Wavy numbers

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

Six Characters

*special problem, constructive algorithms, strings

Kevin and Grid

fft, graphs, math

Special Positions

combinatorics, divide and conquer, fft, math

Cowboy Beblop at his computer

geometry

Sweep Line

combinatorics, games, math

MEXanization

data structures

Old Mobile

combinatorics, dp, probabilities

MEX Tree Manipulation

data structures, trees

Eligible Segments

geometry

Two Rooted Trees

data structures, implementation, trees

Supercollider

brute force

Beaver's Calculator 1.0

greedy

Bakery

data structures, dsu

Days of Floral Colours

combinatorics, divide and conquer, dp, fft, math

Harry Vs Voldemort

dfs and similar, dp, graphs, trees

Mages and Monsters

data structures, geometry

Another array reconstruction algorithm

The Beaver's Problem - 2

Codeforces Scoreboard

binary search, data structures, dp, geometry

Anti-median (Easy Version)

dp, math

Modernization of Treeland

*special problem, dfs and similar, trees

X-wing fighter

Mahmoud and Ehab and the final stage

data structures, strings

Sequence Transformation

brute force, data structures, dp, implementation, math

Training Camp

flows, graphs

Stairs

combinatorics, divide and conquer, dp, fft, math

Star Trek

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

Kirchhoff's Current Loss

math

Block unitary

*special problem

HQ

*special problem, constructive algorithms

Palindromic Doubles

*special problem, data structures, dp

Journey

data structures, divide and conquer, graphs, trees

Recover Polygon (medium)

geometry

Escaping on Beaveractor

dfs and similar, implementation

Factorial zeros

*special problem

Flow Control

data structures, dsu, implementation

Euler tour

constructive algorithms, trees

Power Substring

math, number theory

Two Circles

brute force, data structures, implementation

Script Generation

Chessboard

*special problem

Mashmokh's Designed Problem

data structures

Cactus to Tree

dp, graphs, trees

Wizards and Roads

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

Two Posters

brute force, data structures, greedy, two pointers

Power of quantum Fourier transform

New Year and the Factorisation Collaboration

interactive, math, number theory

Double Permutation Inc.

*special problem, binary search, greedy

Marek and Matching (hard version)

brute force, probabilities

Divide The Students

brute force

Marek and Matching (easy version)

brute force, probabilities

New Year and Snowy Grid

dfs and similar, dsu, graphs, interactive

Hammer throwing

*special problem

Planar Graph

flows, geometry, graphs

Vacuum Сleaner

geometry

Baldman and the military

dfs and similar, graphs, trees

Игра в Девятку II

*special problem, brute force

Graph Coloring

data structures, graphs, interactive

Kojiro and Furrari

dp, greedy

Privatization

flows, graphs

Hero to Zero

graph matchings, math

Minecraft Series

brute force, two pointers

A Preponderant Reunion

constructive algorithms, dp

Kingdom Partition

flows

Test Data Generation

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

Little Artem and 2-SAT

Imitating the Key Tree

combinatorics, dsu, trees

Array Sorting

*special problem

Unique Strings

combinatorics, dp, math

School Clubs

dp, fft, math, number theory, probabilities

Iqea

data structures, dfs and similar, divide and conquer, dsu, shortest paths, trees

Chess Championship

constructive algorithms, flows, greedy, math

The Tournament

brute force

Infinite Chess

implementation, shortest paths

The Meeting Place Cannot Be Changed

dfs and similar, graphs

Goshtasp, Vishtasp and Eidi

*special problem, greedy, math

Toys

brute force, combinatorics

Tree and Permutation Game

dfs and similar, games, graphs, trees

The Riddle of the Sphinx

binary search, data structures, data structures, interactive

``Is the bit string periodic?'' oracle

Thanos Snap

binary search, dp, games, greedy, trees

Cacti Symphony

combinatorics, dfs and similar, dp, graphs

Lift and Throw

brute force

Help Monks

constructive algorithms

Entangled Substrings

string suffix structures, strings

Distinguish Y, XZ, -Y and -XZ

``Is the number of ones divisible by 3?'' oracle

Inna and Babies

binary search, data structures, dsu, geometry, implementation

Long sequence

brute force, math, matrices

Dangerous Laser Power

constructive algorithms, dsu, sortings

Growing flowers

data structures

Guard Duty (hard)

geometry

Supercollider

data structures

Weird LCM Operations

brute force, constructive algorithms, number theory