Calendar Reform

*special problem, number theory

Digital Root

number theory

Covered Points

fft, geometry, number theory

Beautiful Decomposition

dp, games, greedy, number theory

Gregor and the Odd Cows (Easy)

bitmasks, geometry, math, number theory

Divisors

brute force, dfs and similar, implementation, number theory

Cooperative Game

constructive algorithms, interactive, number theory

On Number of Decompositions into Multipliers

combinatorics, math, number theory

Prime Gift

binary search, dfs and similar, math, meet-in-the-middle, number theory, two pointers

Genius

bitmasks, dp, graphs, number theory

Modular Sequence

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

Hyperregular Bracket Strings

combinatorics, greedy, hashing, math, number theory, sortings

REQ

data structures, number theory

Flipping Range

constructive algorithms, dp, greedy, number theory

Partial Sums

combinatorics, math, number theory

Tonya and Burenka-179

data structures, greedy, math, number theory

Very Interesting Game

brute force, number theory

Deleting Numbers

interactive, math, number theory

Square-free division (hard version)

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

Natasha, Sasha and the Prefix Sums

combinatorics, dp, math, number theory

Bots

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

Chopping Carrots (Hard Version)

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

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

Cards

combinatorics, dp, math, number theory, probabilities

GCD Counting

divide and conquer, dp, dsu, number theory, trees

GukiZ and Binary Operations

combinatorics, implementation, math, matrices, number theory

Partial Sorting

combinatorics, math, number theory

The Child and Binary Tree

combinatorics, divide and conquer, fft, number theory

Digits

dp, math, number theory

Pluses everywhere

combinatorics, dp, math, number theory

Ehab's REAL Number Theory Problem

brute force, dfs and similar, graphs, number theory, shortest paths

Beaver Game

dp, games, number theory

Please, another Queries on Array?

bitmasks, data structures, divide and conquer, math, number theory

Congruence Equation

chinese remainder theorem, 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

Valid Bitonic Permutations

combinatorics, dp, implementation, math, number theory

Girl Permutation

combinatorics, dp, math, number theory

Power Tower

chinese remainder theorem, math, number theory

Extreme Extension

dp, greedy, math, number theory

Steps to One

dp, math, number theory, probabilities

Arpa and a list of numbers

implementation, number theory

Two chandeliers

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

Game of the Year

brute force, data structures, math, number theory

MEX of LCM

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

LCM Sum (easy version)

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

Apple Tree

dfs and similar, number theory, trees

Array GCD

dp, greedy, number theory

Fib-tree

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

Instant Noodles

graphs, hashing, math, number theory

Chocolate

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

Reducing Fractions

implementation, math, number theory, sortings

The Holmes Children

math, number theory

Ray Tracing

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

Hemose in ICPC ?

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

Make It One

bitmasks, combinatorics, dp, math, number theory, shortest paths

Divan and Kostomuksha (hard version)

dp, number theory

Jzzhu and Apples

constructive algorithms, 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

Asterism (Hard Version)

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

Divisors

interactive, math, number theory

Kuroni and the Punishment

math, number theory, probabilities

Vasily the Bear and Sequence

brute force, greedy, implementation, number theory

One-Dimensional Puzzle

combinatorics, math, number theory

Perfect Groups

dp, math, number theory

Madoka and The Best University

math, number theory

Sad powers

binary search, math, number theory

Multicolored Markers

binary search, brute force, math, number theory

Prefix Product Sequence

constructive algorithms, math, number theory

Upgrading Array

dp, greedy, math, number theory

Product Oriented Recurrence

dp, math, matrices, number theory

Missing Numbers

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

Moodular Arithmetic

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

Makoto and a Blackboard

dp, math, number theory, probabilities

Not Quite Lee

combinatorics, dp, math, number theory

Divisor Paths

combinatorics, graphs, greedy, math, number theory

Minimum Possible LCM

brute force, greedy, math, number theory

Anton and School - 2

combinatorics, dp, math, number theory

Graph Cost

dp, greedy, 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

Sum of Remainders

implementation, math, number theory

Winter is here

combinatorics, dp, math, number theory

Pseudorandom Sequence Period

*special problem, implementation, number theory

Mike and Foam

bitmasks, combinatorics, dp, math, number theory

Rectangular Congruence

constructive algorithms, number theory

Video Cards

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

Arithmetic Progression

binary search, interactive, number theory, probabilities

Counting Rhyme

dp, math, number theory

Potion Brewing Class

dfs and similar, math, number theory, trees

GCD on a grid

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

Rectangular Game

number theory