GCD vs LCM

constructive algorithms, math

Is it rated - 3

*special problem, combinatorics, dp, math

Pōja Verdon

*special problem, implementation, math

Mike's Sequence

*special problem, divide and conquer, implementation, math

Drone Photo

combinatorics, math, sortings

Il Derby della Madonnina

data structures, dp, math

Boundary

brute force, math

Round Table

math

European Trip

dp, graphs, math, matrices

Narrow Components

brute force, data structures, dp, dsu, math, trees

Water the Trees

binary search, greedy, math

Array Balancing

greedy, math

Promising String (hard version)

data structures, implementation, math, strings

Promising String (easy version)

brute force, implementation, math, strings

Maximum Product Strikes Back

brute force, implementation, math, two pointers

Vlad and Candies

math

Vasya and Coins

greedy, math

Reverse Sort Sum

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

Line Empire

binary search, brute force, dp, greedy, implementation, math

Red Versus Blue

constructive algorithms, greedy, implementation, math

Juju and Binary String

brute force, constructive algorithms, greedy, math

Gojou and Matrix Game

data structures, dp, games, hashing, implementation, math, number theory, sortings

388535 (Hard Version)

bitmasks, brute force, data structures, math

388535 (Easy Version)

bitmasks, math

Shinju and the Lost Permutation

constructive algorithms, math

Marin and Anti-coprime Permutation

combinatorics, math, number theory

Marin and Photoshoot

constructive algorithms, implementation, math

Star MST

combinatorics, dp, graph matchings, math

For Gamers. By Gamers.

binary search, brute force, greedy, math, sortings

Integer Moves

brute force, math

Equal LCM Subsets

data structures, math, number theory

Cycle Palindrome

constructive algorithms, graphs, math

Parametric MST

binary search, constructive algorithms, graphs, greedy, math, sortings

Equal Tree Sums

constructive algorithms, dfs and similar, math, trees

K-good

constructive algorithms, math, number theory

Make Equal With Mod

constructive algorithms, math, number theory, sortings

Subtract Operation

data structures, greedy, math, two pointers

Good Pairs

math, sortings

Three Minimums

combinatorics, constructive algorithms, divide and conquer, dp, fft, math

Arithmetic Operations

brute force, data structures, graphs, math

Potion Brewing Class

dfs and similar, math, number theory, trees

Sum of Matchings

brute force, combinatorics, constructive algorithms, dfs and similar, graph matchings, greedy, math

Rescheduling the Exam

binary search, data structures, greedy, implementation, math, sortings

Twist the Permutation

brute force, constructive algorithms, implementation, math

DIV + MOD

math

Integral Array

brute force, constructive algorithms, data structures, math

Weird Sum

combinatorics, data structures, geometry, math, matrices, sortings

Madoka and the Best School in Russia

constructive algorithms, dp, math, number theory

Madoka and Math Dad

implementation, math

Power Board

brute force, dp, math, number theory

Factorials and Powers of Two

bitmasks, brute force, constructive algorithms, dp, math

Square Counting

math

Basis

combinatorics, fft, math, number theory

Expand the Path

brute force, combinatorics, data structures, implementation, math

Cross Coloring

data structures, implementation, math

Special Positions

combinatorics, divide and conquer, fft, math

Two Arrays

bitmasks, brute force, combinatorics, greedy, hashing, math, two pointers

Inversion Graph

data structures, dsu, graphs, math

Odd Swap Sort

data structures, math, sortings

Reverse

constructive algorithms, greedy, math

Minimize Inversions Number

data structures, greedy, math, sortings

Birthday

constructive algorithms, greedy, math

Yet Another Minimization Problem

dp, greedy, math

MEX and Array

brute force, dp, greedy, math

Infinite Set

bitmasks, dp, math, matrices, number theory, strings

Fibonacci Additions

brute force, data structures, hashing, implementation, math

Finding Zero

constructive algorithms, interactive, math

Fortune Telling

bitmasks, math

Spanning Tree Queries

binary search, data structures, dfs and similar, dsu, graphs, greedy, math, sortings, trees

Kill the Monster

brute force, math

New Year Concert

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

Strange Test

binary search, bitmasks, brute force, dp, math

Expected Components

combinatorics, math, number theory, probabilities

GCD Arrays

greedy, math, number theory

Game on Sum (Hard Version)

combinatorics, dp, games, math

Game on Sum (Easy Version)

combinatorics, dp, games, math

Grid Xor

constructive algorithms, greedy, implementation, interactive, math

Meximum Array

binary search, constructive algorithms, greedy, implementation, math, two pointers

Not Adding

brute force, dp, math, number theory

A Random Code Problem

combinatorics, dp, math, number theory, probabilities

Martial Arts Tournament

binary search, brute force, greedy, math

Monsters And Spells

binary search, data structures, dp, greedy, implementation, math, two pointers

Binary Spiders

bitmasks, data structures, implementation, math, sortings, trees

Ancient Civilization

bitmasks, greedy, math

Division by Two and Permutation

constructive algorithms, flows, graph matchings, greedy, math

Make AP

implementation, math

Plus One on the Subset

math

Robot Cleaner Revisit

implementation, math, probabilities

Robot Cleaner

brute force, implementation, math

Quadratic Set

constructive algorithms, hashing, math, number theory

Shuffle

combinatorics, math, two pointers

Berland Music

data structures, greedy, math, sortings

Construct a Rectangle

geometry, math

Weighted Increasing Subsequences

data structures, dp, math

The Winter Hike

constructive algorithms, greedy, math

Hidden Permutations

dfs and similar, interactive, math

BA-String

brute force, dp, greedy, implementation, math

Triangles on a Rectangle

geometry, greedy, math

Let's Play the Hat?

brute force, constructive algorithms, greedy, math

MEX and Increments

constructive algorithms, data structures, dp, greedy, implementation, math, sortings