Restoring the Permutation

constructive algorithms, implementation

Sleeping Schedule

dp, implementation

Gardener and the Array

bitmasks, constructive algorithms

Vertical Paths

graphs, implementation, trees

Pineapple Incident

implementation, math

Colour the Flag

brute force, implementation

Carousel

constructive algorithms, dp, graphs, greedy, math

Division

brute force, math, number theory

Johny Likes Numbers

implementation, math

Painting Eggs

greedy, math

Powerful array

data structures, implementation, math, two pointers

Divisor Subtraction

implementation, math, number theory

Obtain The String

dp, greedy, strings

Equator

implementation

Drinks Choosing

greedy, math

Scoring Subsequences

binary search, greedy, math, two pointers

Benches

binary search, implementation

Little Alawn's Puzzle

combinatorics, dp, dsu, graphs, math

Stripe

data structures, implementation

Copil Copac Draws Trees

dfs and similar, dp, graphs, trees

Palindromifier

constructive algorithms, strings

Klever Permutation

constructive algorithms, math, two pointers

Dubious Cyrpto

binary search, brute force, math, number theory

Game on Permutation

data structures, dp, games, greedy

Increasing Sequence

constructive algorithms, implementation, math

Cashier

implementation

Take Your Places!

implementation

Cobb

bitmasks, brute force, greedy, math

Prime Matrix

binary search, brute force, math, number theory

Dorms War

brute force, implementation, strings

Did We Get Everything Covered?

constructive algorithms, dp, greedy, shortest paths, strings

Set or Decrease

binary search, brute force, greedy, sortings

Super Agent

implementation

Split Into Two Sets

dfs and similar, dsu, graphs

Circle Coloring

constructive algorithms

Bear and Prime 100

constructive algorithms, interactive, math

Hexadecimal's Numbers

brute force, implementation, math

Counting Kangaroos is Fun

binary search, greedy, sortings, two pointers

Madoka and Childish Pranks

constructive algorithms, greedy

Increasing Subsequence (easy version)

greedy

Ehab and subtraction

implementation, sortings

No More Inversions

constructive algorithms, math

Preparation for International Women's Day

math, number theory

Histogram Ugliness

greedy, implementation, math

Minimum Triangulation

dp, greedy, math

Permutation Operations

constructive algorithms, greedy, implementation, math

Find the Spruce

brute force, dp, implementation

Minimum Grid Path

brute force, data structures, greedy, math

Ebony and Ivory

brute force, math, number theory

A pile of stones

implementation, math

Bessie and MEX

constructive algorithms, math

Chat Online

implementation

Getting an A

greedy, sortings

Insert and Equalize

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

Sea Battle

math

Minimal Height Tree

graphs, greedy, shortest paths, trees

Make It Round

brute force, number theory

Pythagorean Triples

math, number theory

Two Arrays

combinatorics, dp

Ostap and Grasshopper

implementation, strings

Beautiful Numbers

data structures, implementation, math, two pointers

Erase and Extend (Easy Version)

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

Astrophysicists

greedy, math

Yarik and Musical Notes

hashing, math, number theory

Lunar New Year and Cross Counting

implementation

Tile Painting

constructive algorithms, math, number theory

Seraphim the Owl

dp, greedy

Strange Test

binary search, bitmasks, brute force, dp, math

DZY Loves Sequences

dp, implementation, two pointers

Vampiric Powers, anyone?

bitmasks, brute force, dp, greedy

Unusual Competitions

greedy

Array Destruction

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

Good Numbers (hard version)

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

Pipes

dp, implementation

Constant Palindrome Sum

brute force, data structures, greedy, two pointers

Battle Cows

binary search, data structures, greedy

Unforgivable Curse (easy version)

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

Eugene and an array

binary search, data structures, implementation, two pointers

Bear and Five Cards

constructive algorithms, implementation

President's Office

implementation

Xenia and Divisors

greedy, implementation

DZY Loves Chemistry

dfs and similar, dsu, greedy

Nearly Shortest Repeating Substring

brute force, implementation, number theory, strings

The Number of Products

combinatorics, dp, implementation

Mr. Kitayuta's Colorful Graph

dfs and similar, dp, dsu, graphs

Meme Problem

binary search, math

Little Dima and Equation

brute force, implementation, math, number theory

Constructive Problem

brute force, greedy

Unforgivable Curse (hard version)

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

Data Structures Fan

binary search, bitmasks, data structures, dp

Factorial Divisibility

math, number theory

Jatayu's Balanced Bracket Sequence

data structures, dsu, graphs, greedy

Qingshan Loves Strings 2

constructive algorithms, greedy, implementation

Detective Book

implementation

Right-Left Cipher

implementation, strings

Edgy Trees

dfs and similar, dsu, graphs, math, trees

Jumping Through Segments

binary search, constructive algorithms

Place for a Selfie

binary search, data structures, geometry, math

As Simple as One and Two

dp, greedy

Exam

constructive algorithms, implementation, math