Round Subset

dp, math

Half of Same

brute force, math, number theory

Quiz

binary search, greedy, math, matrices, number theory

GameGame

bitmasks, constructive algorithms, dp, games, greedy, math

Black Cells

binary search, brute force, greedy, math

Triangle

brute force, geometry, implementation, math

Music

implementation, math

Benches

combinatorics, math

GCD of an Array

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

Colored Balls

combinatorics, dp, math, sortings

Find Maximum

implementation, math, number theory

Restorer Distance

binary search, greedy, math, sortings, ternary search

Absolute Beauty

greedy, math

For Gamers. By Gamers.

binary search, brute force, greedy, math, sortings

Keep the Average High

dp, greedy, math

A Problem about Polyline

geometry, math

Obtain a Permutation

greedy, implementation, math

Do you want a date?

implementation, math, sortings

Divisible by Seven

math, number theory

Lonely Numbers

binary search, math, number theory, two pointers

Ternary Logic

implementation, math

Count Good Substrings

math

Array Product

constructive algorithms, greedy, math

Berserk And Fireball

constructive algorithms, greedy, implementation, math, two pointers

Bertown Subway

dfs and similar, greedy, math

Buying Jewels

constructive algorithms, greedy, math

Up the Strip

brute force, dp, math, number theory, two pointers

Wonder Room

brute force, math

The BOSS Can Count Pairs

brute force, math

Unusual Product

implementation, math

Array Stabilization (AND version)

brute force, graphs, math, number theory, shortest paths

Petr and Permutations

combinatorics, math

Gabriel and Caterpillar

implementation, math

Santa Claus and Robot

constructive algorithms, math

Limit

math

Nuts

greedy, math

Nastya and a Wardrobe

math

Forecast

math

Cableway

greedy, math

Elevator

brute force, implementation, math

Friends

graphs, implementation, math

CGCDSSQ

brute force, data structures, math

New Year Concert

binary search, data structures, greedy, math, number theory, two pointers

Great Vova Wall (Version 1)

greedy, implementation, math

Finite or not?

implementation, math

MEX Sequences

dp, math

Submarine in the Rybinsk Sea (hard edition)

combinatorics, math, number theory

Vasya And The Matrix

constructive algorithms, flows, math

Inversion Counting

brute force, math

Divisibility

math

Send Boxes to Alice (Easy Version)

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

Remove Extra One

brute force, data structures, math

Expression Evaluation Error

constructive algorithms, greedy, implementation, math

Strange Device

constructive algorithms, interactive, math, sortings

Sereja and Contests

greedy, implementation, math

Ralph And His Magic Field

combinatorics, constructive algorithms, math, number theory

Mysterious Crime

brute force, combinatorics, math, meet-in-the-middle, two pointers

The Intriguing Obsession

combinatorics, dp, math

Progress Bar

implementation, math

Gift Set

binary search, greedy, math, ternary search

Success Rate

binary search, math

Vanya and Triangles

brute force, combinatorics, data structures, geometry, math, sortings

Directed Roads

combinatorics, dfs and similar, graphs, math

Masha and geometric depression

brute force, implementation, math

Trivial Conjecture

*special problem, constructive algorithms, math, number theory

LuoTianyi and the Floating Islands (Easy Version)

combinatorics, math, probabilities, trees

Efim and Strange Grade

dp, implementation, math

Jumping Jack

math

Dreamoon and Sets

constructive algorithms, greedy, math

Save Energy!

binary search, implementation, math

Messages

math

Block Towers

brute force, greedy, math, number theory

Marco and GCD Sequence

constructive algorithms, math

Guess Your Way Out!

implementation, math, trees

Iterated Linear Function

math, number theory

Madoka and The Corruption Scheme

combinatorics, constructive algorithms, greedy, math

Colliders

math, number theory

Line

math, number theory

Finding Zero

constructive algorithms, interactive, math

Depression

geometry, math

Restore the Permutation

binary search, constructive algorithms, data structures, greedy, math

Count Pairs

math, matrices, number theory, two pointers

Divide by Three

dp, greedy, math, number theory

Bitwise Queries (Easy Version)

bitmasks, constructive algorithms, interactive, math

View Angle

brute force, geometry, math

XOR Inverse

bitmasks, data structures, divide and conquer, dp, greedy, math, sortings, strings, trees

Wish I Knew How to Sort

dp, math, probabilities

Sasha and a Walk in the City

combinatorics, dp, math, trees

Robbers' watch

brute force, combinatorics, dp, math

Imbalanced Arrays

constructive algorithms, graphs, greedy, math, sortings, two pointers

Tourist Problem

combinatorics, implementation, math

New Year Table

geometry, math

DNA Alignment

math, strings

Checkpoints

brute force, constructive algorithms, greedy, math, probabilities

Voltage Keepsake

binary search, math

Powerful Ksenia

bitmasks, constructive algorithms, math

Divide Candies

math, number theory

Petya and Square

implementation, math

Median String

bitmasks, math, number theory, strings

Hexagons

brute force, constructive algorithms, greedy, implementation, math, shortest paths