Football

constructive algorithms

Easy Assembly

greedy, sortings

Dominoes

combinatorics, flows, graph matchings, greedy

Cactus Meets Torus

BinCoin

binary search, divide and conquer, hashing, implementation, probabilities, trees

Amazing Trick

constructive algorithms, graph matchings, math, probabilities

Gaining Rating

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

Copy of a Copy of a Copy

constructive algorithms, dfs and similar, graphs, implementation, sortings

Permutation Game

games

Absolute Sorting

constructive algorithms, math

Different Differences

constructive algorithms, greedy, math

Matrix Rotation

brute force, implementation

A+B?

implementation

Hossam and Range Minimum Query

binary search, bitmasks, data structures, hashing, probabilities, strings, trees

Hossam and a Letter

brute force, dp, implementation, two pointers

Hossam and (sub-)palindromic tree

brute force, data structures, dfs and similar, dp, strings, trees

Hossam and Trainees

greedy, math, number theory

Hossam and Friends

binary search, constructive algorithms, dp, two pointers

Hossam and Combinatorics

combinatorics, math, sortings

Koxia, Mahiru and Winter Festival

constructive algorithms

Koxia and Bracket

divide and conquer, fft, math

Koxia and Sequence

bitmasks, combinatorics, dp, math, number theory

Koxia and Tree

combinatorics, dfs and similar, dp, dsu, math, probabilities, trees

Koxia and Game

constructive algorithms, data structures, dfs and similar, dsu, flows, games, graph matchings, graphs, implementation

Koxia and Number Theory

brute force, chinese remainder theorem, math, number theory

Koxia and Permutation

constructive algorithms

Koxia and Whiteboards

brute force, greedy

Игра в Девятку III

*special problem, brute force

Игра в Девятку II

*special problem, brute force

Игра в Девятку I

*special problem, brute force, dp

Подкрутка II

*special problem, dp

Подкрутка I

*special problem, brute force, dp, greedy

Копирование файлов II

*special problem, binary search, brute force, math

Копирование файлов I

*special problem, brute force, implementation, math

Узкая дорога

*special problem, math

Wonderful Jump

dp, greedy

Partial Sorting

combinatorics, math, number theory

Lucky Permutation

constructive algorithms, dfs and similar, graphs, greedy

Elemental Decompress

constructive algorithms, greedy, implementation, sortings

Quick Sort

greedy, math

Greatest Convex

greedy, math, number theory

Two Subtrees

data structures, trees

Algebra Flash

bitmasks, brute force, dp, graphs, math, meet-in-the-middle, trees

Playoff

combinatorics, constructive algorithms, dp, greedy, math

Count Binary Strings

data structures, dp

Block Towers

data structures, greedy, sortings

Cut the Triangle

implementation

MCF

flows

Decomposition

binary search, brute force, data structures, divide and conquer, dp, two pointers

Lucky Chains

math, number theory

Hamiltonian Wall

dp, implementation

Notepad#

implementation

Extremely Round

brute force, implementation

Number Reduction

greedy

Minimum LCM

math, number theory

Project Manager

brute force, data structures, implementation

Torus Path

greedy, math

Hero to Zero

graph matchings, math

Infinite Chess

implementation, shortest paths

Hospital Queue

binary search, graphs, greedy, implementation

Guess the String

constructive algorithms, interactive, probabilities

Chemistry Lab

dp, geometry, probabilities

Exchange

brute force, math

Watch the Videos

binary search, constructive algorithms, two pointers

Card Guessing

combinatorics, dp, probabilities

Broken Keyboard

greedy

Access Levels

bitmasks, dsu, flows, graph matchings

Doremy's Paint 2

data structures

Doremy's Perfect DS Class (Hard Version)

binary search, interactive

Doremy's Perfect DS Class (Medium Version)

binary search, interactive

Doremy's Perfect DS Class (Easy Version)

binary search, interactive

Doremy's Experimental Tree

brute force, constructive algorithms, dfs and similar, dsu, sortings, trees

Doremy's Number Line

dp, greedy, sortings

Doremy's Pegging Game

combinatorics, dp, math

Doremy's City Construction

graphs, greedy

Doremy's Perfect Math Class

math, number theory

Doremy's Paint

greedy

Edge Queries

data structures, dfs and similar, dp, dsu, graphs, trees

Node Pairs

dp, graphs, math, number theory

Valid Bitonic Permutations

combinatorics, dp, implementation, math, number theory

Another Array Problem

brute force, constructive algorithms, greedy

Incinerate

binary search, brute force, data structures, implementation, math, sortings

Absolute Maximization

bitmasks, constructive algorithms, greedy, math

Unequal Adjacent Elements

constructive algorithms, sortings

Good Pairs

binary search, data structures, dp

Tree Sum

combinatorics, math, trees

GCD Queries

constructive algorithms, interactive, number theory

Binary Strings are Fun

combinatorics, math

Make Array Good

constructive algorithms, implementation, number theory, sortings

Divide and Conquer

greedy, math, number theory

Centroid Guess

interactive, probabilities, trees

Anti-median (Hard Version)

combinatorics, dp, math

Anti-median (Easy Version)

dp, math

Make It Connected

binary search, brute force, constructive algorithms, dsu, graphs, greedy, matrices, trees, two pointers

Carry Bit

combinatorics, math

Set Construction

constructive algorithms, dfs and similar, graphs, greedy

Elimination of a Ring

constructive algorithms, greedy, implementation

Two Permutations

brute force, constructive algorithms

SlavicG's Favorite Problem

bitmasks, dfs and similar, graphs

Quests

binary search, greedy, sortings