Game of the Year

brute force, data structures, math, number theory

Many Perfect Squares

brute force, math, number theory

Delicious Dessert

binary search, dsu, hashing, math, number theory, string suffix structures

Three Chairs

bitmasks, brute force, combinatorics, data structures, dp, number theory, sortings

Josuke and Complete Graph

binary search, brute force, data structures, math, number theory

GCD Partition

brute force, greedy, math, number theory

Maximizing Root

dfs and similar, dp, graphs, math, number theory, trees

Quiz Master

binary search, math, number theory, sortings, two pointers

Friendly Spiders

dfs and similar, graphs, math, number theory, shortest paths

Hossam and Trainees

greedy, math, number theory

Koxia and Sequence

bitmasks, combinatorics, dp, math, number theory

Koxia and Number Theory

brute force, chinese remainder theorem, math, number theory

Partial Sorting

combinatorics, math, number theory

Greatest Convex

greedy, math, number theory

Lucky Chains

math, number theory

Minimum LCM

math, number theory

Doremy's Perfect Math Class

math, number theory

Node Pairs

dp, graphs, math, number theory

Valid Bitonic Permutations

combinatorics, dp, implementation, math, number theory

GCD Queries

constructive algorithms, interactive, number theory

Make Array Good

constructive algorithms, implementation, number theory, sortings

Divide and Conquer

greedy, math, number theory

All Possible Digits

binary search, data structures, greedy, math, number theory

Make It Round

brute force, number theory

Almost All Multiples

greedy, number theory

Factorial Divisibility

math, number theory

Count GCD

combinatorics, math, number theory

Counting Arrays

combinatorics, dp, math, number theory

ConstructOR

bitmasks, chinese remainder theorem, combinatorics, constructive algorithms, math, number theory

Divisible Numbers (hard version)

brute force, math, number theory

Divisible Numbers (easy version)

brute force, math, number theory

Coprime

brute force, greedy, number theory

Arranging Crystal Balls

data structures, divide and conquer, divide and conquer, dp, geometry, graphs, number theory

Factorise N+M

constructive algorithms, number theory

Ela and Prime GCD

constructive algorithms, math, number theory

Playing with GCD

math, number theory

Rectangular Congruence

constructive algorithms, number theory

Location

data structures, dp, math, number theory

Balance (Hard version)

brute force, data structures, number theory

Balance (Easy version)

brute force, data structures, implementation, number theory

Bestie

brute force, combinatorics, constructive algorithms, implementation, math, number theory

Graph Cost

dp, greedy, math, number theory

Even Subarrays

bitmasks, brute force, hashing, math, number theory

Maximums and Minimums

combinatorics, data structures, divide and conquer, number theory

Red-Black Pepper

brute force, data structures, greedy, math, number theory

Electrical Efficiency

combinatorics, data structures, dp, math, number theory, trees

Burenka Plays with Fractions

math, number theory

Burenka, an Array and Queries

data structures, math, number theory

Tonya and Burenka-179

data structures, greedy, math, number theory

Fibonacci Strings

greedy, implementation, math, number theory

Madoka and The Best University

math, number theory

Madoka and Strange Thoughts

math, number theory

Bags with Balls

combinatorics, dp, math, number theory

Add Modulo 10

brute force, math, number theory

Tournament Countdown

constructive algorithms, greedy, interactive, number theory, probabilities

LCM Sum (hard version)

brute force, data structures, math, number theory, two pointers

LCM Sum (easy version)

binary search, brute force, combinatorics, math, number theory, two pointers

Woeful Permutation

constructive algorithms, greedy, number theory

Bugaboo

bitmasks, constructive algorithms, dp, number theory

Chopping Carrots (Hard Version)

brute force, constructive algorithms, data structures, dp, greedy, math, number theory, two pointers

Chopping Carrots (Easy Version)

binary search, brute force, constructive algorithms, greedy, number theory

Equate Multisets

constructive algorithms, data structures, greedy, math, number theory

Three Days Grace

data structures, dp, greedy, math, number theory, two pointers

Long Binary String

bitmasks, math, matrices, meet-in-the-middle, number theory

Shifting String

graphs, math, number theory, strings

Become Big For Me

combinatorics, constructive algorithms, greedy, math, number theory

Euclid Guess

constructive algorithms, flows, graph matchings, math, number theory

AvtoBus

brute force, greedy, math, number theory

Power or XOR?

bitmasks, combinatorics, math, number theory

Lost Arithmetic Progression

combinatorics, math, number theory

Palindrome Basis

brute force, dp, math, number theory

GCD Guess

bitmasks, chinese remainder theorem, constructive algorithms, games, interactive, math, number theory

Gojou and Matrix Game

data structures, dp, games, hashing, implementation, math, number theory, sortings

Marin and Anti-coprime Permutation

combinatorics, math, number theory

Equal LCM Subsets

data structures, math, number theory

K-good

constructive algorithms, math, number theory

Make Equal With Mod

constructive algorithms, math, number theory, sortings

Potion Brewing Class

dfs and similar, math, number theory, trees

Madoka and the Best School in Russia

constructive algorithms, dp, math, number theory

Power Board

brute force, dp, math, number theory

Basis

combinatorics, fft, math, number theory

Infinite Set

bitmasks, dp, math, matrices, number theory, strings

New Year Concert

binary search, data structures, greedy, math, number theory, two pointers

Making It Bipartite

flows, graph matchings, graphs, number theory

Expected Components

combinatorics, math, number theory, probabilities

Flipping Range

constructive algorithms, dp, greedy, number theory

GCD Arrays

greedy, math, number theory

Not Adding

brute force, dp, math, number theory

Not Assigning

constructive algorithms, dfs and similar, number theory, trees

A Random Code Problem

combinatorics, dp, math, number theory, probabilities

Quadratic Set

constructive algorithms, hashing, math, number theory

Christmas Chocolates

dfs and similar, dp, games, graphs, implementation, math, number theory, shortest paths, trees

GCD Problem

brute force, constructive algorithms, math, number theory

Divan and Kostomuksha (hard version)

dp, number theory

Divan and Kostomuksha (easy version)

dp, number theory

X-Magic Pair

math, number theory

Not Quite Lee

combinatorics, dp, math, number theory

Complex Market Analysis

binary search, dp, implementation, number theory, schedules, two pointers

Divide and Multiply

greedy, implementation, math, number theory

Dominoes

combinatorics, fft, graphs, math, number theory