Counting Arrays

combinatorics, dp, math, number theory

Ilya And The Tree

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

Small GCD

bitmasks, brute force, dp, math, number theory

GCD Guess

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

Multipliers

math, number theory

Roman and Numbers

bitmasks, brute force, combinatorics, dp, number theory

Number With The Given Amount Of Divisors

brute force, dp, number theory

Divide by Three

dp, greedy, math, number theory

GCD Counting

data structures, dfs and similar, dp, number theory, trees

New Year Concert

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

GCD and MST

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

Modular Stability

combinatorics, math, number theory

SUM and REPLACE

brute force, data structures, dsu, number theory

The Football Season

brute force, math, number theory

Two Divisors

constructive algorithms, math, number theory

Lucky Permutation

brute force, combinatorics, number theory

Beautiful Decomposition

dp, games, greedy, number theory

Partial Sums

combinatorics, math, number theory

Lucky Days

math, number theory

Card Game Again

binary search, data structures, number theory, two pointers

Pairs of Numbers

brute force, dfs and similar, math, number theory

Chocolate

brute force, dfs and similar, math, meet-in-the-middle, number theory

Missing Numbers

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

Video Cards

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

Prime Number

math, number theory

Mahmoud and Ehab and another array construction task

constructive algorithms, greedy, math, number theory

Lost Arithmetic Progression

combinatorics, math, number theory

GCD on a grid

brute force, dfs and similar, dp, implementation, math, number theory

Counting Factorizations

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

Petya and Divisors

binary search, data structures, number theory

Alex and Julian

bitmasks, math, number theory

Vasilije Loves Number Theory

brute force, math, number theory

Shaass and Lights

combinatorics, number theory

Split Plus K

greedy, math, number theory

Median String

bitmasks, math, number theory, strings

Up the Strip

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

Half of Same

brute force, math, number theory

Asterism (Easy Version)

binary search, brute force, combinatorics, math, number theory, sortings

Bash and a Tough Math Puzzle

data structures, number theory

Madoka and the Best School in Russia

constructive algorithms, dp, math, number theory

Necklace Assembly

brute force, dfs and similar, dp, graphs, greedy, number theory

Counting Arrays

combinatorics, dp, math, number theory

Divisible Numbers (hard version)

brute force, math, number theory

Vanya and Scales

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

Array Stabilization (GCD version)

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

Strange Definition

bitmasks, graphs, hashing, math, number theory

Strange Beauty

dp, math, number theory, sortings

K-good

constructive algorithms, math, number theory

Not Adding

brute force, dp, math, number theory

Prime Segment

*special problem, brute force, math, number theory

Xenolith? Hippodrome?

*special problem, number theory

Very Interesting Game

brute force, number theory

Bots

combinatorics, dp, math, number theory

Reducing Fractions

implementation, math, number theory, sortings

Ray Tracing

greedy, hashing, implementation, math, number theory, sortings

Vasily the Bear and Sequence

brute force, greedy, implementation, number theory

Upgrading Array

dp, greedy, math, number theory

Moodular Arithmetic

combinatorics, dfs and similar, dsu, math, number theory

My pretty girl Noora

brute force, dp, greedy, math, number theory

Simple Subset

constructive algorithms, greedy, number theory

Alternating Sum

math, number theory

Compression

dp, implementation, math, number theory

All Possible Digits

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

Line

math, number theory

Missing Subsequence Sum

bitmasks, constructive algorithms, greedy, number theory

Ralph And His Magic Field

combinatorics, constructive algorithms, math, number theory

Send Boxes to Alice (Easy Version)

constructive algorithms, greedy, math, number theory, ternary search, two pointers

Submarine in the Rybinsk Sea (hard edition)

combinatorics, math, number theory

Monitor

binary search, number theory

Border

number theory

Recover it!

dfs and similar, graphs, greedy, number theory, sortings

Many Perfect Squares

brute force, math, number theory

Tournament Countdown

constructive algorithms, greedy, interactive, number theory, probabilities

Remainders Game

chinese remainder theorem, math, number theory

Count GCD

combinatorics, math, number theory

Nezzar and Board

constructive algorithms, math, number theory

Vasya and Triangle

geometry, number theory

Friendly Spiders

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

Vika and Price Tags

math, number theory

Infinite Set

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

Neko does Maths

brute force, math, number theory

Power Products

hashing, math, number theory

Ntarsis' Set

binary search, math, number theory

Enlarge GCD

number theory

Same GCDs

math, number theory

Dima and Lisa

brute force, math, number theory

Maximum Distributed Tree

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

Integers Have Friends

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

Petya and His Friends

constructive algorithms, math, number theory

Full Turn

geometry, hashing, number theory

Devu and Partitioning of the Array

brute force, constructive algorithms, implementation, number theory

Iterated Linear Function

math, number theory

Array Stabilization (AND version)

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

Primal Sport

math, number theory

Wet Shark and Flowers

combinatorics, math, number theory, probabilities

Up the Strip (simplified version)

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

Mike and gcd problem

dp, greedy, number theory

The Meaningless Game

math, number theory

Magic Triples (Easy Version)

brute force, data structures, math, number theory

Chopping Carrots (Easy Version)

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