Make Product Equal One

dp, implementation

Palindromic Paths

implementation, interactive

Remove the Substring (hard version)

binary search, greedy, implementation, two pointers

Remove the Substring (easy version)

greedy, implementation

Common Divisors

implementation, math

Circle of Students

implementation

Graph Traveler

brute force, data structures, dfs and similar, dp, graphs, implementation, math, number theory

Compress Words

brute force, hashing, implementation, string suffix structures, strings

White Lines

brute force, data structures, dp, implementation, two pointers

Hotelier

brute force, data structures, implementation

You Are Given Some Letters...

binary search, implementation, math

You Are Given a WASD-string...

brute force, data structures, dp, greedy, implementation, math, strings

Treasure Hunting

binary search, dp, greedy, implementation

Important Exam

implementation, strings

City Day

implementation

Connected Component on a Chessboard

constructive algorithms, implementation

RGB Substring (hard version)

data structures, dp, implementation, two pointers

RGB Substring (easy version)

implementation

Robot Breakout

implementation

Pillars

greedy, implementation

From S To T

implementation, strings

Yet Another Crosses Problem

implementation

Tokitsukaze and Discard Items

implementation, two pointers

Tokitsukaze and Mahjong

brute force, implementation

Parallel Universes (Easy)

implementation

Heidi and the Turing Test (Easy)

implementation

Add on a Tree: Revolution

constructive algorithms, dfs and similar, implementation, trees

Candies!

data structures, dp, implementation, math

Vasya And Array

constructive algorithms, greedy, implementation

Letters Shop

binary search, implementation, strings

Vus the Cossack and a Graph

dfs and similar, graphs, greedy, implementation

Vus the Cossack and a Field

divide and conquer, implementation, math

Vus the Cossack and Strings

implementation, math

Vus the Cossack and a Contest

implementation

Candy Box (hard version)

greedy, implementation, sortings

Subsequences (easy version)

dp, graphs, implementation, shortest paths

Nearest Interesting Number

implementation

Nick and Array

greedy, implementation

Alex and a Rhombus

dp, implementation, math

Serge and Dining Room

binary search, data structures, graph matchings, greedy, implementation, math, trees

Valeriy and Deque

data structures, implementation

Polycarp and Snakes

brute force, implementation

Extra Element

implementation, math

Email from Polycarp

implementation, strings

Irrigation

binary search, data structures, implementation, sortings, trees, two pointers

Flag

brute force, combinatorics, dp, implementation

Split a Number

greedy, implementation, strings

Complete Mirror

constructive algorithms, dfs and similar, dp, hashing, implementation, trees

Plus from Picture

dfs and similar, implementation, strings

Destroy it!

dp, implementation, sortings

Lose it!

dp, greedy, implementation

Divide it!

brute force, greedy, implementation

Nauuo and Cards

greedy, implementation

Minimal Segment Cover

data structures, dfs and similar, divide and conquer, dp, greedy, implementation, trees

Catch Overflow!

data structures, expression parsing, implementation

From Hero to Zero

implementation, math

Ehab and the Big Finale

constructive algorithms, divide and conquer, graphs, implementation, interactive, trees

Digits Sequence (Hard Edition)

binary search, divide and conquer, implementation

Digits Sequence (Easy Edition)

implementation

Decoding of Integer Sequences

*special problem, data structures, implementation

Minus and Minus Give Plus

*special problem, implementation, strings

Bad Days

*special problem, implementation

Pairs

graphs, implementation

Circle Metro

implementation, math

Anagram Paths

dp, implementation, trees

Microtransactions (hard version)

binary search, greedy, implementation

Remainder

implementation, math

Expansion coefficient of the array

implementation, math

A pile of stones

implementation, math

The Party and Sweets

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

Cat Party (Easy Edition)

data structures, implementation

Power Transmission (Hard Edition)

data structures, geometry, implementation, math

Cat Party (Hard Edition)

data structures, implementation

Zoning Restrictions Again

implementation

Optimizer

graphs, greedy, hashing, implementation

Ugly Pairs

dfs and similar, greedy, implementation, sortings, strings

Tiling Challenge

greedy, implementation

Stock Arbitraging

greedy, implementation

Tree Generator™

data structures, implementation, trees

Three Religions

dp, implementation, strings

Reachable Numbers

implementation

Neko Finds Grapes

greedy, implementation, math

Game with Telephone Numbers

games, greedy, implementation

Reverse a Substring

implementation, sortings, strings

Hot is Cold

bitmasks, data structures, divide and conquer, implementation

Hate "A"

implementation, strings

Love "A"

implementation, strings

Two Teams

data structures, implementation, sortings

Gourmet Cat

implementation, math

Get Ready for the Battle

constructive algorithms, implementation

Ramesses and Corner Inversion

constructive algorithms, greedy, implementation, math

Ilya and a Colorful Walk

greedy, implementation

Pigeon d'Or

implementation

Thanos Sort

implementation

Parity Alternated Deletions

greedy, implementation, sortings

Diverse Strings

implementation, strings

The Doors

implementation

Good String

implementation, strings

Detective Book

implementation

Chocolates

greedy, implementation