Carousel

constructive algorithms, greedy, math

K-th Beautiful String

binary search, brute force, combinatorics, implementation, math

Divisibility Problem

math

Count The Blocks

combinatorics, dp, math

Infinite Path

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

Sum of Odd Integers

math

Wise Men (Hard Version)

bitmasks, dp, math

Permutation Partitions

combinatorics, greedy, math

Maximums

implementation, math

Count the Arrays

combinatorics, math

Adding Powers

bitmasks, greedy, implementation, math, number theory, ternary search

Two Regular Polygons

geometry, greedy, math, number theory

Instant Noodles

graphs, hashing, math, number theory

Present

binary search, bitmasks, constructive algorithms, data structures, math, sortings

Primitive Primes

constructive algorithms, math, ternary search

Kuroni and the Punishment

math, number theory, probabilities

Kuroni and the Score Distribution

constructive algorithms, greedy, implementation, math

Kuroni and Impossible Calculation

brute force, combinatorics, math, number theory

Journey Planning

data structures, dp, greedy, math, sortings

M-numbers

*special problem, dp, math

Three Integers

brute force, math

Add Odd or Subtract Even

greedy, implementation, math

Bad Cryptography

math, number theory

Different Rules

constructive algorithms, greedy, implementation, math

Cow and Treats

binary search, combinatorics, dp, greedy, implementation, math

Cow and Message

brute force, dp, math, strings

Cow and Friend

geometry, greedy, math

Two Rabbits

math

Ayoub's function

binary search, combinatorics, greedy, math, strings

National Project

math

Non-zero

implementation, math

So Mean

interactive, math

Around the World

bitmasks, combinatorics, dfs and similar, dp, graphs, math, trees

Anu Has a Function

brute force, greedy, math

Food Buying

math

Array with Odd Sum

math

Even But Not Even

greedy, math, strings

Same GCDs

math, number theory

Infinite Prefixes

math, strings

Obtain a Permutation

greedy, implementation, math

MEX maximizing

data structures, greedy, implementation, math

Product of Three Numbers

greedy, math, number theory

Collecting Coins

math

JOE is on TV!

combinatorics, greedy, math

Rin and The Unknown Flower

constructive algorithms, greedy, interactive, math

Chaotic V.

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

Yet Another Meme Problem

math

Deadline

binary search, brute force, math, ternary search

Fadi and LCM

brute force, math, number theory

Mezo Playing Zoma

math

Harry The Potter

brute force, constructive algorithms, dp, fft, implementation, math

LCC

data structures, math, matrices, probabilities

Madhouse (Hard version)

brute force, constructive algorithms, hashing, interactive, math

Madhouse (Easy version)

brute force, constructive algorithms, interactive, math

New Year and Social Network

data structures, graph matchings, graphs, math, trees

New Year and Castle Construction

combinatorics, geometry, math, sortings

New Year and Permutation

combinatorics, math

Xor on Figures

constructive algorithms, fft, math

Subset with Zero Sum

constructive algorithms, dfs and similar, graphs, math

Awesome Substrings

math, strings

Divide Points

constructive algorithms, geometry, math

Strange Device

constructive algorithms, interactive, math, sortings

Make Good

bitmasks, constructive algorithms, math

Interesting Subarray

constructive algorithms, greedy, math

Card Game

games, greedy, math

Friends and Gifts

constructive algorithms, data structures, math

Candies Division

math

Minutes Before the New Year

math

Santa's Bot

combinatorics, math, probabilities

New Year Garland

math

Temporarily unavailable

implementation, math

Invertation in Tournament

brute force, divide and conquer, graphs, math

Domino for Young

dp, greedy, math

Equation

brute force, math

Cards

combinatorics, dp, math, number theory, probabilities

A and B

greedy, math

Red-Blue Graph

dp, graphs, math, matrices, meet-in-the-middle

Decreasing Debts

constructive algorithms, data structures, graphs, greedy, implementation, math, two pointers

Diverse Matrix

constructive algorithms, greedy, math, number theory

Dice Tower

constructive algorithms, math

Competitive Programmer

chinese remainder theorem, math

Common Number

binary search, combinatorics, dp, math

Blocks

greedy, math

Suits

brute force, greedy, math

Intergalactic Sliding Puzzle

combinatorics, constructive algorithms, math

Kirchhoff's Current Loss

math

Beingawesomeism

implementation, math

Cut and Paste

implementation, math

Beautiful Rectangle

brute force, combinatorics, constructive algorithms, data structures, greedy, math

Let's Play the Words?

data structures, hashing, implementation, math

Three Friends

brute force, greedy, math, sortings

Beautiful Mirrors

data structures, dp, math, probabilities

Beautiful Numbers

data structures, implementation, math, two pointers

Key Storage

combinatorics, math

Just Arrange the Icons

greedy, implementation, math

Game Relics

math, probabilities

Everyone is a Winner!

binary search, math, meet-in-the-middle, number theory

Sweet Problem

math

Infinite Fence

greedy, math, number theory

Obtain Two Zeroes

binary search, math