Extreme Extension

dp, greedy, math, number theory

Moderate Modular Mode

constructive algorithms, math, number theory

Di-visible Confusion

constructive algorithms, math, number theory

Array Elimination

bitmasks, greedy, math, number theory

Half of Same

brute force, math, number theory

All are Same

math, number theory

Hemose in ICPC ?

binary search, dfs and similar, implementation, interactive, math, number theory, trees

Windblume Ode

math, number theory

Kuzya and Homework

data structures, number theory

CQXYM Count Permutations

combinatorics, math, number theory

Array Stabilization (AND version)

brute force, graphs, math, number theory, shortest paths

GCD Festival

math, number theory

Cyclic Sum

data structures, fft, number theory

Xor-quiz

constructive algorithms, dp, interactive, math, number theory

Tubular Bells

interactive, math, number theory, probabilities

Scenes From a Memory

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

Up the Strip (simplified version)

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

Mocha and Stars

combinatorics, dp, fft, math, number theory

Up the Strip

brute force, dp, math, number theory, two pointers

You

dfs and similar, dp, math, number theory

Common Divisor Graph

brute force, constructive algorithms, dsu, graphs, hashing, math, number theory

Digits Sum

math, number theory

Guess the Perimeter

binary search, interactive, number theory

Gregor and Cryptography

math, number theory

Gregor and the Odd Cows (Hard)

brute force, geometry, math, number theory

Gregor and the Odd Cows (Easy)

bitmasks, geometry, math, number theory

Integers Have Friends

binary search, data structures, divide and conquer, math, number theory, two pointers

Array Stabilization (GCD version)

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

Exciting Bets

greedy, math, number theory

Strange Function

math, number theory

Plus and Multiply

constructive algorithms, math, number theory

Pleasant Pairs

brute force, implementation, math, number theory

Interesting Function

binary search, dp, math, number theory

Another Problem About Dividing Numbers

constructive algorithms, math, number theory

Deleting Divisors

games, math, number theory

Diluc and Kaeya

data structures, dp, hashing, number theory

Array Reodering

brute force, greedy, math, number theory, sortings

I Hate 1111

dp, math, number theory

Potion-making

math, number theory

Nastia and a Good Array

constructive algorithms, math, number theory

Nastia and Nearly Good Numbers

constructive algorithms, math, number theory

Ordinary Numbers

brute force, math, number theory

Berland Regional

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

Cut

binary search, data structures, dp, graphs, number theory, two pointers

Phoenix and Odometers

dfs and similar, graphs, math, number theory

Phoenix and Puzzle

brute force, geometry, math, number theory

Product 1 Modulo N

greedy, number theory

Perfectly Imperfect Array

math, number theory

GCD and MST

constructive algorithms, dsu, graphs, greedy, number theory, sortings

Short Task

brute force, dp, math, number theory

GCD Length

constructive algorithms, math, number theory

Digits

dp, math, number theory

Xenolith? Hippodrome?

*special problem, number theory

DMCA

*special problem, implementation, number theory

Two chandeliers

binary search, brute force, chinese remainder theorem, math, number theory

The Number of Pairs

dp, math, number theory

Square-free division (hard version)

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

Square-Free Division (easy version)

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

Genius

bitmasks, dp, graphs, number theory

Enchanted Matrix

bitmasks, interactive, number theory

GCD of an Array

brute force, data structures, hashing, implementation, math, number theory, sortings, two pointers

Fib-tree

brute force, dfs and similar, divide and conquer, number theory, trees

Painting Numbers

*special problem, data structures, greedy, number theory

Pythagorean Triples

binary search, brute force, math, number theory

Cat Cycle

math, number theory

Multiples and Power Differences

constructive algorithms, graphs, math, number theory

Floor and Mod

binary search, brute force, math, number theory

Add and Divide

brute force, greedy, math, number theory

School Clubs

dp, fft, math, number theory, probabilities

Nezzar and Board

constructive algorithms, math, number theory

Strange Beauty

dp, math, number theory, sortings

Odd Divisor

math, number theory

Different Divisors

binary search, constructive algorithms, greedy, math, number theory

String LCM

brute force, math, number theory, strings

Strange Partition

greedy, math, number theory

Strange Definition

bitmasks, graphs, hashing, math, number theory

Ceil Divisions

brute force, constructive algorithms, math, number theory

Prime Divisors Selection

binary search, greedy, math, number theory

Full Turn

geometry, hashing, number theory

Add to Neighbour and Remove

greedy, math, number theory

Row GCD

math, number theory

Strange Functions

math, number theory

Number into Sequence

constructive algorithms, math, number theory

Division

brute force, math, number theory

Sum Over Subsets

combinatorics, math, number theory

Xum

bitmasks, constructive algorithms, math, matrices, number theory

Lonely Numbers

binary search, math, number theory, two pointers

Boring Queries

data structures, math, number theory

Decryption

constructive algorithms, implementation, math, number theory

Equal Product

data structures, math, number theory, two pointers

Fair Numbers

brute force, number theory

Yet Another Array Restoration

brute force, math, number theory

Big Vova

brute force, greedy, math, number theory

Deleting Numbers

interactive, math, number theory

Game of Pairs

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

Maximum Distributed Tree

dfs and similar, dp, greedy, implementation, math, number theory, sortings, trees

Mere Array

constructive algorithms, math, number theory, sortings

Running Competition

bitmasks, fft, math, number theory

Power Sequence

brute force, math, number theory, sortings

Multiples of Length

constructive algorithms, greedy, number theory