Divisor Subtraction

implementation, math, number theory

Equator

implementation

Gardener and the Array

bitmasks, constructive algorithms

Carousel

constructive algorithms, dp, graphs, greedy, math

Powerful array

data structures, implementation, math, two pointers

Benches

binary search, implementation

Shifts and Sorting

constructive algorithms, greedy

Little Alawn's Puzzle

combinatorics, dp, dsu, graphs, math

Palindromifier

constructive algorithms, strings

XOR-distance

bitmasks, greedy, implementation, math

Dubious Cyrpto

binary search, brute force, math, number theory

Stripe

data structures, implementation

Inaccurate Subsequence Search

data structures, two pointers

Scoring Subsequences

binary search, greedy, math, two pointers

Cashier

implementation

Take Your Places!

implementation

Copil Copac Draws Trees

dfs and similar, dp, graphs, trees

Dorms War

brute force, implementation, strings

Increasing Sequence

constructive algorithms, implementation, math

Cobb

bitmasks, brute force, greedy, math

Circle Coloring

constructive algorithms

Drinks Choosing

greedy, math

Game on Permutation

data structures, dp, games, greedy

Super Agent

implementation

Minimum Triangulation

dp, greedy, math

Hexadecimal's Numbers

brute force, implementation, math

Madoka and Childish Pranks

constructive algorithms, greedy

Prime Matrix

binary search, brute force, math, number theory

Histogram Ugliness

greedy, implementation, math

Set or Decrease

binary search, brute force, greedy, sortings

No More Inversions

constructive algorithms, math

Increasing Subsequence (easy version)

greedy

Find the Spruce

brute force, dp, implementation

Ehab and subtraction

implementation, sortings

Counting Kangaroos is Fun

binary search, greedy, sortings, two pointers

Permutation Operations

constructive algorithms, greedy, implementation, math

Preparation for International Women's Day

math, number theory

Klever Permutation

constructive algorithms, math, two pointers

A pile of stones

implementation, math

Minimum Grid Path

brute force, data structures, greedy, math

Bear and Prime 100

constructive algorithms, interactive, math

Chat Online

implementation

Getting an A

greedy, sortings

Ebony and Ivory

brute force, math, number theory

Sea Battle

math

Ostap and Grasshopper

implementation, strings

Split Into Two Sets

dfs and similar, dsu, graphs

Beautiful Numbers

data structures, implementation, math, two pointers

Minimal Height Tree

graphs, greedy, shortest paths, trees

Pythagorean Triples

math, number theory

Lunar New Year and Cross Counting

implementation

Did We Get Everything Covered?

constructive algorithms, dp, greedy, shortest paths, strings

Two Arrays

combinatorics, dp

Tile Painting

constructive algorithms, math, number theory

Astrophysicists

greedy, math

Erase and Extend (Easy Version)

binary search, brute force, dp, greedy, hashing, implementation, string suffix structures, strings, two pointers

Unusual Competitions

greedy

DZY Loves Sequences

dp, implementation, two pointers

Strange Test

binary search, bitmasks, brute force, dp, math

Good Numbers (hard version)

binary search, greedy, math, meet-in-the-middle

Vampiric Powers, anyone?

bitmasks, brute force, dp, greedy

Pipes

dp, implementation

Constant Palindrome Sum

brute force, data structures, greedy, two pointers

Insert and Equalize

brute force, constructive algorithms, greedy, math, number theory

Array Destruction

brute force, constructive algorithms, data structures, greedy, implementation, sortings

Yarik and Musical Notes

hashing, math, number theory

Bear and Five Cards

constructive algorithms, implementation

Unforgivable Curse (easy version)

brute force, constructive algorithms, dsu, graphs, greedy, strings

President's Office

implementation

Bessie and MEX

constructive algorithms, math

Eugene and an array

binary search, data structures, implementation, two pointers

Xenia and Divisors

greedy, implementation

DZY Loves Chemistry

dfs and similar, dsu, greedy

Meme Problem

binary search, math

Little Dima and Equation

brute force, implementation, math, number theory

Mr. Kitayuta's Colorful Graph

dfs and similar, dp, dsu, graphs

The Number of Products

combinatorics, dp, implementation

Detective Book

implementation

Jatayu's Balanced Bracket Sequence

data structures, dsu, graphs, greedy

Right-Left Cipher

implementation, strings

Constructive Problem

brute force, greedy

Make It Round

brute force, number theory

As Simple as One and Two

dp, greedy

Coin Games

games

Factorial Divisibility

math, number theory

Unforgivable Curse (hard version)

brute force, constructive algorithms, dfs and similar, dsu, graphs, greedy, strings

Exam

constructive algorithms, implementation, math

Column Swapping

brute force, constructive algorithms, greedy, implementation, sortings

Edgy Trees

dfs and similar, dsu, graphs, math, trees

Many Equal Substrings

implementation, strings

Place for a Selfie

binary search, data structures, geometry, math

Repainting Street

brute force, brute force, greedy

Lucky Substring

brute force, implementation

Reconnaissance

brute force

Reorder the Array

combinatorics, data structures, math, sortings, two pointers

Modified GCD

binary search, number theory

Sequence and Swaps

dp, greedy, sortings

Qingshan Loves Strings 2

constructive algorithms, greedy, implementation

Passwords

implementation, math, sortings, strings

Lord of the Values

constructive algorithms