Nice Matrix

greedy, implementation, math

Sets and Union

bitmasks, brute force, constructive algorithms, greedy

Divide and Equalize

math, number theory

Madoka and Formal Statement

greedy

Make Nonzero Sum (easy version)

constructive algorithms, dp, greedy

Prefix Permutation Sums

implementation, math

Make it Increasing

brute force, greedy, math

Inversion Graph

data structures, dsu, graphs, math

Lucky Numbers (easy)

binary search, bitmasks, brute force

Long Number

greedy

Masha and a Beautiful Tree

dfs and similar, divide and conquer, graphs, sortings, trees

Paprika and Permutation

binary search, greedy, math, sortings

Good Subarrays (Easy Version)

binary search, data structures, schedules, two pointers

Balanced Tunnel

data structures, sortings, two pointers

Creating a Character

binary search, math

Particles

dp, greedy, implementation, math

Make it Alternating

combinatorics, dp, greedy

MEX Game 1

games, greedy

Knapsack

constructive algorithms, greedy, sortings

Good Numbers (easy version)

brute force, greedy, implementation

Parity Shuffle Sorting

constructive algorithms, sortings

Obtain Two Zeroes

binary search, math

And It's Non-Zero

bitmasks, greedy, math

Permutation Partitions

combinatorics, greedy, math

Good Array

Rudolf and Snowflakes (simple version)

brute force, implementation, math

Saving the City

dp, greedy, math, sortings

Perform the Combo

brute force

Two Tables

brute force

Divisible Pairs

combinatorics, math, number theory

Directional Increase

greedy

Chat Ban

binary search, math

Simple Game

constructive algorithms, games, greedy, implementation, math

Longest Strike

data structures, greedy, implementation, sortings, two pointers

Jeff and Periods

implementation, sortings

Mahmoud and Ehab and the bipartiteness

dfs and similar, graphs, trees

Ice Cream Balls

binary search, combinatorics, constructive algorithms, math

Co-growing Sequence

bitmasks, constructive algorithms, greedy

Box Fitting

binary search, bitmasks, data structures, greedy

Forever Winter

dfs and similar, graphs, math

Maximal AND

bitmasks, greedy, math

Di-visible Confusion

constructive algorithms, math, number theory

Books Exchange (hard version)

dfs and similar, dsu, math

Not Sitting

games, greedy, sortings

Negative Prefixes

greedy, sortings

Bear and Poker

implementation, math, number theory

Inhabitant of the Deep Sea

greedy, implementation, math

Road Construction

constructive algorithms, graphs

Blue-Red Permutation

greedy, math, sortings

Matching Numbers

constructive algorithms, greedy, math

Social Network (hard version)

data structures, implementation

Slay the Dragon

binary search, greedy, sortings, ternary search

Points on Line

binary search, combinatorics, two pointers

Big Vova

brute force, greedy, math, number theory

Closest Cities

greedy, implementation, math

OR in Matrix

greedy, hashing, implementation

Getting Zero

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

We Were Both Children

brute force, implementation, math, number theory

Pokémon Army (easy version)

constructive algorithms, dp, greedy

Chocolate

combinatorics

Canine poetry

dp, greedy, strings

Strong Vertices

math, sortings, trees

Make a Power of Two

greedy, math, strings

3SUM Closure

brute force, data structures

Pluses and Minuses

math

Two Round Dances

combinatorics, math

Find the Different Ones!

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

Yet Another Problem About Pairs Satisfying an Inequality

binary search, data structures, dp, greedy, sortings

Romantic Glasses

data structures, greedy, math

Array and Operations

dp, greedy, math

Equalize

dp, greedy, strings

Most socially-distanced subsequence

greedy, two pointers

Get an Even String

dp, greedy, strings

Nastya and Door

greedy, implementation

A and B and Team Training

greedy, implementation, math, number theory

Inflation

binary search, brute force, greedy, math

Common Divisors

implementation, math

Shuffle

math, two pointers

Number into Sequence

constructive algorithms, math, number theory

Prefix Flip (Easy Version)

constructive algorithms, data structures, strings

A Cookie for You

greedy, implementation, math

Nastia and a Good Array

constructive algorithms, math, number theory

Coin Rows

brute force, constructive algorithms, dp, implementation

Just Eat It!

dp, greedy, implementation

3SUM

brute force, math

Strange Birthday Party

binary search, dp, greedy, sortings, two pointers

Rumor

dfs and similar, graphs, greedy

Anton and currency you all know

greedy, math, strings

Social Distance

constructive algorithms, greedy, math

Mere Array

constructive algorithms, math, number theory, sortings

Queue

greedy, implementation, sortings

Polygon

dp, graphs, implementation, shortest paths

Alice, Bob and Candies

implementation

Jzzhu and Sequences

implementation, math

Trouble Sort

constructive algorithms, implementation

Omkar and Last Class of Math

greedy, math, number theory

Anti-Sudoku

constructive algorithms, implementation

Number of Pairs

binary search, data structures, math, two pointers

Little Girl and Game

games, greedy

Queries about less or equal elements

binary search, data structures, sortings, two pointers