Modular Sequence

brute force, constructive algorithms, dp, graphs, greedy, math, number theory

Natasha, Sasha and the Prefix Sums

combinatorics, dp, math, number theory

Yet Another Inversions Problem

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

Red-Black Pepper

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

Partial Sorting

combinatorics, math, number theory

Extreme Extension

dp, greedy, math, number theory

Steps to One

dp, math, number theory, probabilities

Game of the Year

brute force, data structures, math, number theory

LCM Sum (easy version)

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

MEX of LCM

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

Array GCD

dp, greedy, number theory

Instant Noodles

graphs, hashing, math, number theory

Hemose in ICPC ?

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

Divan and Kostomuksha (hard version)

dp, number theory

Asterism (Hard Version)

binary search, combinatorics, dp, math, number theory, sortings

Prefix Product Sequence

constructive algorithms, math, number theory

Product Oriented Recurrence

dp, math, matrices, number theory

Anton and School - 2

combinatorics, dp, math, number theory

Mike and Foam

bitmasks, combinatorics, dp, math, number theory

Devu and Flowers

bitmasks, combinatorics, number theory

Count Pairs

math, matrices, number theory, two pointers

Three Horses

constructive algorithms, math, number theory

Product transformation

combinatorics, math, number theory

GCD Festival

math, number theory

Prime Problem

number theory

Divisor Tree

brute force, number theory, trees

Double Happiness

brute force, math, number theory

Couple Cover

brute force, dp, number theory

Divisors

brute force, dfs and similar, implementation, number theory

Chain Reaction

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

List Of Integers

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

Kuro and GCD and XOR and SUM

binary search, bitmasks, brute force, data structures, dp, dsu, greedy, math, number theory, strings, trees

Node Pairs

dp, graphs, math, number theory

Pluses everywhere

combinatorics, dp, math, number theory

Valid Bitonic Permutations

combinatorics, dp, implementation, math, number theory

Two chandeliers

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

Girl Permutation

combinatorics, dp, math, number theory

Mocha and Stars

combinatorics, dp, fft, math, number theory

Find a Number

dp, graphs, number theory, shortest paths

Magic Triples (Hard Version)

brute force, data structures, math, number theory

Power Board

brute force, dp, math, number theory

Madoka and The Best University

math, number theory

Makoto and a Blackboard

dp, math, number theory, probabilities

Divisor Paths

combinatorics, graphs, greedy, math, number theory

Minimum Possible LCM

brute force, greedy, math, number theory

Sum of Remainders

implementation, math, number theory

Winter is here

combinatorics, dp, math, number theory

Arithmetic Progression

binary search, interactive, number theory, probabilities

Infinite Path

brute force, dfs and similar, graphs, math, number theory

Calendar Ambiguity

math, number theory

Kate and imperfection

greedy, implementation, math, number theory, sortings, two pointers

Multiples and Power Differences

constructive algorithms, graphs, math, number theory

Gerald and Giant Chess

combinatorics, dp, math, number theory

White, Black and White Again

combinatorics, number theory

Periodical Numbers

combinatorics, dp, number theory

Unsolvable

math, number theory

Heidi Learns Hashing (Medium)

brute force, number theory

Vasily the Bear and Beautiful Strings

combinatorics, math, number theory

Chessboard Billiard

dfs and similar, dsu, graphs, number theory

Frog Jumping

dfs and similar, math, number theory

Caisa and Tree

brute force, dfs and similar, math, number theory, trees

GukiZ and Binary Operations

combinatorics, implementation, math, matrices, number theory

Digits

dp, math, number theory

Congruence Equation

chinese remainder theorem, math, number theory

Arpa and a list of numbers

implementation, number theory

Apple Tree

dfs and similar, number theory, trees

The Holmes Children

math, number theory

Perfect Groups

dp, math, number theory

Sad powers

binary search, math, number theory

The LCMs Must be Large

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

ConstructOR

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

Rectangular Congruence

constructive algorithms, number theory

Potion Brewing Class

dfs and similar, math, number theory, trees

Counting Rhyme

dp, math, number theory

Send Boxes to Alice (Hard Version)

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

Vasya and Beautiful Arrays

brute force, dp, number theory

Decryption

constructive algorithms, implementation, math, number theory

GCD Queries

constructive algorithms, interactive, number theory

Array and Operations

flows, graph matchings, number theory

Recovering BST

brute force, dp, math, number theory, trees

Longest Subsequence

brute force, math, number theory

Divan and Kostomuksha (easy version)

dp, number theory

Cut

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

GCD of an Array

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

The Number of Pairs

dp, math, number theory

Ant colony

data structures, math, number theory

Martian Luck

math, number theory

Number Transformation

dp, greedy, number theory

Digital Root

number theory

Beaver Game

dp, games, number theory

Divisors

interactive, math, number theory

One-Dimensional Puzzle

combinatorics, math, number theory

Multicolored Markers

binary search, brute force, math, number theory

Not Quite Lee

combinatorics, dp, math, number theory

Graph Cost

dp, greedy, math, number theory

Fibonacci Strings

greedy, implementation, math, number theory

Unusual Sequences

bitmasks, combinatorics, dp, math, number theory

Coprime Subsequences

bitmasks, combinatorics, number theory

Kamil and Making a Stream

math, number theory, trees

Counting Arrays

combinatorics, dp, math, number theory