Perfect Keyboard

dfs and similar, greedy, implementation

National Project

math

Ayoub's function

binary search, combinatorics, greedy, math, strings

Motarack's Birthday

binary search, greedy, ternary search

Aerodynamic

geometry

Anu Has a Function

brute force, greedy, math

String Coloring (easy version)

constructive algorithms, dp, graphs, greedy, sortings

Fight with Monsters

greedy, sortings

Yet Another Walking Robot

data structures, implementation

Same GCDs

math, number theory

Obtain The String

dp, greedy, strings

Infinite Prefixes

math, strings

Obtain a Permutation

greedy, implementation, math

MEX maximizing

data structures, greedy, implementation, math

Product of Three Numbers

greedy, math, number theory

Aroma's Search

brute force, constructive algorithms, geometry, greedy, implementation

NEKO's Maze Game

data structures, dsu, implementation

Array Sharpening

greedy, implementation

Irreducible Anagrams

binary search, constructive algorithms, data structures, strings, two pointers

Mind Control

brute force, data structures, implementation

Two Arrays

combinatorics, dp

Hyperset

brute force, data structures, implementation

Numbers on Tree

constructive algorithms, data structures, dfs and similar, graphs, greedy, trees

Garland

dp, greedy, sortings

Dr. Evil Underscores

bitmasks, brute force, dfs and similar, divide and conquer, dp, greedy, strings, trees

Fadi and LCM

brute force, math, number theory

Just Eat It!

dp, greedy, implementation

New Year and Permutation

combinatorics, math

New Year and Ascent Sequence

binary search, combinatorics, data structures, dp, implementation, sortings

New Year Parties

dp, greedy

Christmas Trees

graphs, greedy, shortest paths

Friends and Gifts

constructive algorithms, data structures, math

Petya and Exam

greedy, sortings, two pointers

K for the Price of One (Hard Version)

dp, greedy, sortings

K for the Price of One (Easy Version)

dp, greedy, sortings

Azamon Web Services

greedy

Beingawesomeism

implementation, math

Cut and Paste

implementation, math

Santa's Bot

combinatorics, math, probabilities

Stack of Presents

data structures, implementation

Verse For Santa

binary search, brute force, implementation

Berry Jam

data structures, dp, greedy, implementation

A and B

greedy, math

Let's Play the Words?

data structures, hashing, implementation, math

Two Fairs

combinatorics, dfs and similar, dsu, graphs

As Simple as One and Two

dp, greedy

Nearest Opposite Parity

dfs and similar, graphs, shortest paths

Remove One Element

brute force, dp

Shawarma Tent

brute force, geometry, greedy, implementation

Blocks

greedy, math

Strange Device

constructive algorithms, interactive, math, sortings

Make Good

bitmasks, constructive algorithms, math

Modulo Equality

brute force, sortings

Long Beautiful Integer

constructive algorithms, greedy, implementation, strings

Lexicography

constructive algorithms, strings

Just Arrange the Icons

greedy, implementation, math

Elections

greedy

Diverse Matrix

constructive algorithms, greedy, math, number theory

Beautiful Numbers

data structures, implementation, math, two pointers

Beautiful Sequence

brute force, constructive algorithms, greedy

Beautiful Regional Contest

greedy, implementation

Secret Passwords

dfs and similar, dsu, graphs

Everyone is a Winner!

binary search, math, meet-in-the-middle, number theory

PIN Codes

greedy, implementation

A Game with Traps

binary search, dp, greedy, sortings

Infinite Fence

greedy, math, number theory

Obtain Two Zeroes

binary search, math

Yet Another Monster Killing Problem

binary search, data structures, dp, greedy, sortings, two pointers

Binary String Minimizing

greedy

Platforms Jumping

greedy

Minimize the Permutation

greedy

League of Leesins

constructive algorithms, implementation

Send Boxes to Alice (Easy Version)

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

Feeding Chicken

constructive algorithms, greedy, implementation

Harmonious Graph

constructive algorithms, dfs and similar, dsu, graphs, greedy, sortings

Sweets Eating

dp, greedy, math, sortings

Silly Mistake

greedy, implementation

Twin Buildings

greedy, implementation

Even Path

data structures, implementation

Salary Changing

binary search, greedy, sortings

Minimize The Integer

greedy, two pointers

Binary Palindromes

greedy, strings

Divide The Students

binary search, greedy, math

The Parade

binary search, greedy

Happy Birthday

math

The Feast and the Bus

brute force, constructive algorithms, greedy, math

Berstagram

implementation

By Elevator or Stairs?

dp, shortest paths

Too Many Segments (hard version)

data structures, greedy, sortings

Too Many Segments (easy version)

greedy

Good Numbers (hard version)

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

Good Numbers (easy version)

brute force, greedy, implementation

Books Exchange (hard version)

dfs and similar, dsu, math

Shichikuji and Power Grid

dsu, graphs, greedy, shortest paths, trees

Constanze's Machine

dp

Paint the Tree

brute force, constructive algorithms, dp, graphs, implementation, trees

Character Swap (Hard Version)

strings

0-1 MST

dfs and similar, dsu, graphs, sortings

Tile Painting

constructive algorithms, math, number theory

Ivan the Fool and the Probability Theory

combinatorics, dp, math