Region Separation

combinatorics, dp, number theory, trees

Christmas Chocolates

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

Airplane Arrangements

math, number theory

Chaotic V.

dp, graphs, greedy, math, number theory, trees

Number Clicker

divide and conquer, graphs, meet-in-the-middle, number theory

Maximums and Minimums

combinatorics, data structures, divide and conquer, number theory

Paths

data structures, number theory

Another n-dimensional chocolate bar

dp, math, meet-in-the-middle, number theory

Sasha and a Very Easy Test

data structures, number theory

Maximum Sine

binary search, data structures, number theory

Prime Divisors Selection

binary search, greedy, math, number theory

Appropriate Team

bitmasks, math, number theory

Perfectionist Arkadiy

*special problem, number theory

Pens And Days Of Week

*special problem, binary search, number theory

Game of Pairs

constructive algorithms, dfs and similar, interactive, math, number theory

Polygons

greedy, math, number theory

Yash And Trees

bitmasks, data structures, dfs and similar, math, number theory

A Random Code Problem

combinatorics, dp, math, number theory, probabilities

Prince's Problem

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

Ultimate Weirdness of an Array

data structures, number theory

Euclid Guess

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

Sum Over Subsets

combinatorics, math, number theory

Last Man Standing

brute force, data structures, number theory

Cyclic Cipher

chinese remainder theorem, data structures, implementation, number theory, two pointers

Location

data structures, dp, math, number theory

Swimmers in the Pool

dp, fft, math, number theory

GCD Table

chinese remainder theorem, math, number theory

Classical?

binary search, combinatorics, number theory

Present for Vitalik the Philatelist

combinatorics, math, number theory

GCD Groups 2

greedy, number theory, probabilities

Quadratic Set

constructive algorithms, hashing, math, number theory

Nephren Runs a Cinema

chinese remainder theorem, combinatorics, math, number theory

Doctor's Brown Hypothesis

dfs and similar, graphs, math, number theory

Expected Components

combinatorics, math, number theory, probabilities

Tubular Bells

interactive, math, number theory, probabilities

Linear Congruential Generator

number theory

Festival Organization

combinatorics, math, number theory

GCD Master (easy version)

greedy, math, number theory, sortings

Basis

combinatorics, fft, math, number theory

Long Binary String

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

Jzzhu and Squares

dp, math, number theory

Mister B and Astronomers

number theory

Mister B and Beacons on Field

number theory

Strange Triples

brute force, math, number theory

Grid Game 2

games, number theory

Tree Weights

bitmasks, constructive algorithms, data structures, dfs and similar, implementation, math, matrices, number theory, trees

Artistic Partition

divide and conquer, dp, number theory

Coprime Permutation

combinatorics, number theory

Equal Product

data structures, math, number theory, two pointers

Doodle Jump

math, number theory

Weird LCM Operations

brute force, constructive algorithms, number theory

Cyclic Sum

data structures, fft, number theory

The Child and Binary Tree

combinatorics, divide and conquer, fft, number theory

Surprise me!

divide and conquer, math, number theory, trees

Koxia and Sequence

bitmasks, combinatorics, dp, math, number theory

To Make 1

bitmasks, constructive algorithms, dp, greedy, number theory

Move by Prime

combinatorics, math, number theory

Drazil and His Happy Friends

math, number theory

Bosco and Particle

dp, math, number theory, strings

Heidi Learns Hashing (Hard)

fft, math, number theory

PolandBall and Many Other Balls

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

Equal LCM Subsets

data structures, math, number theory

Wooden Raft

binary search, math, number theory

Power Substring

math, number theory

New Year and the Factorisation Collaboration

interactive, math, number theory

New Year Running

number theory, trees

Xor-quiz

constructive algorithms, dp, interactive, math, number theory

Math, math everywhere

brute force, dp, math, meet-in-the-middle, number theory

Number of Binominal Coefficients

dp, math, number theory

Oppa Funcan Style Remastered

graphs, math, number theory, shortest paths

Guess the Perimeter

binary search, interactive, number theory

Gold Experience

constructive algorithms, graphs, math, number theory, probabilities

Gregor and the Odd Cows (Hard)

brute force, geometry, math, number theory

Burenka, an Array and Queries

data structures, math, number theory

Ela and Prime GCD

constructive algorithms, math, number theory

Making It Bipartite

flows, graph matchings, graphs, number theory

Radix sum

fft, math, number theory

Fedya the Potter

binary search, implementation, math, number theory

Test Data Generation

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

Fake bullions

combinatorics, dfs and similar, dp, graphs, number theory

Long number

expression parsing, math, number theory

Tokitsukaze and Powers

number theory, probabilities

Cyclic Hamming (Easy Version)

brute force, divide and conquer, dp, fft, math, number theory

Bad Cryptography

math, number theory

Beautiful Fibonacci Problem

constructive algorithms, number theory

Become Big For Me

combinatorics, constructive algorithms, greedy, math, number theory

School Clubs

dp, fft, math, number theory, probabilities

Epic Convolution

chinese remainder theorem, fft, math, number theory

Bugaboo

bitmasks, constructive algorithms, dp, number theory

Optimizations From Chelsu

divide and conquer, dp, number theory, trees

Arranging Crystal Balls

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

Cyclic Hamming (Hard Version)

brute force, dp, fft, math, number theory

Cubic Lattice

geometry, math, matrices, number theory