IQ test

brute force

Registration System

data structures, hashing, implementation

T-primes

binary search, implementation, math, number theory

Cut Ribbon

brute force, dp

Sort the Array

implementation, sortings

Pashmak and Flowers

combinatorics, implementation, sortings

Random Teams

combinatorics, constructive algorithms, greedy, math

Product of Three Numbers

greedy, math, number theory

Buying Shovels

math, number theory

Dreamoon and WiFi

bitmasks, brute force, combinatorics, dp, math, probabilities

K-th Beautiful String

binary search, brute force, combinatorics, implementation, math

Queries about less or equal elements

binary search, data structures, sortings, two pointers

Little Girl and Game

games, greedy

Number of Pairs

binary search, data structures, math, two pointers

Anti-Sudoku

constructive algorithms, implementation

Omkar and Last Class of Math

greedy, math, number theory

Trouble Sort

constructive algorithms, implementation

Jzzhu and Sequences

implementation, math

Alice, Bob and Candies

implementation

Polygon

dp, graphs, implementation, shortest paths

Queue

greedy, implementation, sortings

Mere Array

constructive algorithms, math, number theory, sortings

Social Distance

constructive algorithms, greedy, math

Anton and currency you all know

greedy, math, strings

Rumor

dfs and similar, graphs, greedy

3SUM

brute force, math

Strange Birthday Party

binary search, dp, greedy, sortings, two pointers

Just Eat It!

dp, greedy, implementation

Coin Rows

brute force, constructive algorithms, dp, implementation

Nastia and a Good Array

constructive algorithms, math, number theory

A Cookie for You

greedy, implementation, math

Prefix Flip (Easy Version)

constructive algorithms, data structures, strings

Common Divisors

implementation, math

Number into Sequence

constructive algorithms, math, number theory

Shuffle

math, two pointers

Inflation

binary search, brute force, greedy, math

A and B and Team Training

greedy, implementation, math, number theory

Nastya and Door

greedy, implementation

Get an Even String

dp, greedy, strings

Romantic Glasses

data structures, greedy, math

Find the Different Ones!

binary search, brute force, data structures, dp, dsu, greedy, two pointers

Most socially-distanced subsequence

greedy, two pointers

Inhabitant of the Deep Sea

greedy, implementation, math

Yet Another Problem About Pairs Satisfying an Inequality

binary search, data structures, dp, greedy, sortings

Equalize

dp, greedy, strings

Array and Operations

dp, greedy, math

Two Round Dances

combinatorics, math

3SUM Closure

brute force, data structures

Pluses and Minuses

math

Strong Vertices

math, sortings, trees

Make a Power of Two

greedy, math, strings

We Were Both Children

brute force, implementation, math, number theory

Chocolate

combinatorics

Canine poetry

dp, greedy, strings

Pokémon Army (easy version)

constructive algorithms, dp, greedy

Getting Zero

bitmasks, brute force, dfs and similar, dp, graphs, greedy, shortest paths

Closest Cities

greedy, implementation, math

OR in Matrix

greedy, hashing, implementation

Points on Line

binary search, combinatorics, two pointers

Big Vova

brute force, greedy, math, number theory

Maximal AND

bitmasks, greedy, math

Slay the Dragon

binary search, greedy, sortings, ternary search

Matching Numbers

constructive algorithms, greedy, math

Social Network (hard version)

data structures, implementation

Blue-Red Permutation

greedy, math, sortings

Road Construction

constructive algorithms, graphs

Bear and Poker

implementation, math, number theory

Negative Prefixes

greedy, sortings

Forever Winter

dfs and similar, graphs, math

Not Sitting

games, greedy, sortings

Books Exchange (hard version)

dfs and similar, dsu, math

Di-visible Confusion

constructive algorithms, math, number theory

Box Fitting

binary search, bitmasks, data structures, greedy

Ice Cream Balls

binary search, combinatorics, constructive algorithms, math

Divisible Pairs

combinatorics, math, number theory

Mahmoud and Ehab and the bipartiteness

dfs and similar, graphs, trees

Co-growing Sequence

bitmasks, constructive algorithms, greedy

Chat Ban

binary search, math

Longest Strike

data structures, greedy, implementation, sortings, two pointers

Jeff and Periods

implementation, sortings

Simple Game

constructive algorithms, games, greedy, implementation, math

Directional Increase

greedy

MEX Game 1

games, greedy

Two Tables

brute force

Perform the Combo

brute force

Saving the City

dp, greedy, math, sortings

Rudolf and Snowflakes (simple version)

brute force, implementation, math

Good Array

Permutation Partitions

combinatorics, greedy, math

And It's Non-Zero

bitmasks, greedy, math

Parity Shuffle Sorting

constructive algorithms, sortings

Make it Alternating

combinatorics, dp, greedy

Good Numbers (easy version)

brute force, greedy, implementation

Obtain Two Zeroes

binary search, math

Knapsack

constructive algorithms, greedy, sortings

Particles

dp, greedy, implementation, math

Balanced Tunnel

data structures, sortings, two pointers

Divide and Equalize

math, number theory

Creating a Character

binary search, math

Arrow Path

brute force, constructive algorithms, dfs and similar, dp, graphs, shortest paths