Belted Rooms

graphs, implementation

Sets and Union

bitmasks, brute force, constructive algorithms, greedy

Product 1 Modulo N

greedy, number theory

Swaps

greedy, math, sortings

Diverse Substrings

brute force, implementation, strings

Heating

math

Divide and Equalize

math, number theory

LuoTianyi and the Table

greedy, math

Vlad and a Pair of Numbers

bitmasks, constructive algorithms

Distinct Characters Queries

data structures

Playing with Paper

implementation, math

LIS or Reverse LIS?

constructive algorithms, greedy, implementation, math

Adding Digits

implementation, math

Keyboard Layouts

implementation, strings

Giga Tower

brute force

George and Job

dp, implementation

And Matching

bitmasks, constructive algorithms

White-Black Balanced Subtrees

dfs and similar, dp, graphs, trees

Devu, the Dumb Guy

implementation, sortings

The Fibonacci Segment

implementation

Not Assigning

constructive algorithms, dfs and similar, number theory, trees

Appleman and Card Game

greedy

Filya and Homework

implementation, sortings

Indivisible

constructive algorithms

City Day

implementation

Is it rated - 2

*special problem, implementation, interactive

Ugu

brute force, dp, greedy, implementation

Contest for Robots

greedy

Arya and Bran

implementation

Berland Crossword

bitmasks, brute force, greedy, implementation

Scarborough Fair

implementation

awoo's Favorite Problem

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

Game on Ranges

brute force, dfs and similar, implementation, sortings

Good ol' Numbers Coloring

math, number theory

Chip and Ribbon

greedy, math

Fingerprints

implementation

Wizards' Duel

implementation, math

Bicycle Chain

brute force, implementation

k-Factorization

implementation, math, number theory

Lunar New Year and a Wander

data structures, dfs and similar, graphs, greedy, shortest paths

Incinerate

binary search, brute force, data structures, implementation, math, sortings

Cifera

math

Move and Turn

dp, math

Lose it!

dp, greedy, implementation

Fight with Monsters

greedy, sortings

Fox and Number Game

greedy, math

Duff in Love

math

Divine Array

constructive algorithms, implementation

Almost Equal

constructive algorithms, greedy, math

Silent Classroom

combinatorics, greedy

Vitaliy and Pie

greedy, hashing, strings

Motarack's Birthday

binary search, greedy, ternary search

Reverse String

brute force, dp, hashing, implementation, strings

WOW Factor

dp, strings

Sweets Eating

dp, greedy, math, sortings

Parsa's Humongous Tree

dfs and similar, divide and conquer, dp, greedy, trees

Array Sharpening

greedy, implementation

Integer Points

geometry, math

Air Conditioners

data structures, dp, implementation, shortest paths, sortings, two pointers

Seating Arrangements (easy version)

data structures, greedy, sortings

Vaccination

greedy, implementation

Arrow Path

brute force, constructive algorithms, dfs and similar, dp, graphs, shortest paths

Elections

implementation

Kuroni and the Gifts

brute force, constructive algorithms, greedy, sortings

Queue Sort

greedy, implementation, sortings

Dreamoon Likes Permutations

implementation, math

NP-Hard Problem

dfs and similar, graphs

Make It Permutation

brute force, greedy, sortings

Valid BFS?

dfs and similar, graphs, shortest paths, trees

Watching a movie

greedy, implementation

Banknotes

greedy, number theory

Perfect Squares

brute force, implementation, math

Equal XOR

bitmasks, constructive algorithms

Opponents

implementation

Prison Transfer

data structures, implementation

Phone Numbers

brute force

Little Elephant and Magic Square

brute force, implementation

Great Graphs

constructive algorithms, graphs, greedy, shortest paths, sortings

Minimum Ties

brute force, constructive algorithms, dfs and similar, graphs, greedy, implementation, math

Vanya and Exams

greedy, sortings

AND Sequences

bitmasks, combinatorics, constructive algorithms, math

Emotes

greedy, math, sortings

Add Candies

constructive algorithms, math

Number Circle

greedy, math, sortings

Buying a TV Set

math

Computer Game

binary search, math

Money Trees

binary search, greedy, math, two pointers

Nicholas and Permutation

constructive algorithms, implementation

They Are Everywhere

binary search, strings, two pointers

Block Adventure

dp, greedy

Yet Another Counting Problem

math, number theory

Non-alternating Deck (easy version)

implementation

Make Almost Equal With Mod

bitmasks, constructive algorithms, math, number theory

Minimal Cost

brute force, math

Make Good

bitmasks, constructive algorithms, math

AquaMoon and Strange Sort

sortings

Windblume Ode

math, number theory

Unlucky Ticket

greedy, sortings

Flag

implementation

Array Splitting

greedy, sortings