Pentagonal numbers

*special problem, implementation

Find Pair

implementation, math, sortings

Friends or Not

*special problem, greedy, implementation

Cd and pwd commands

*special problem, data structures, implementation

Taxi

*special problem, greedy, implementation

Next Round

*special problem, implementation

Suspects

constructive algorithms, data structures, implementation

Steps

binary search, implementation

Marks

implementation

Phone Numbers

implementation, strings

Soft Drinking

implementation, math

Martian Clock

implementation

Business trip

greedy, implementation, sortings

Escape

implementation, math

Insomnia cure

constructive algorithms, implementation, math

Punctuation

implementation, strings

Lucky Mask

brute force, implementation

Lucky Ticket

implementation

Lucky Pair

combinatorics, data structures, implementation

Lucky Conversion

greedy, implementation

Anagram Search

implementation, strings

Meeting

implementation

Arrival of the General

implementation

Help Kingdom of Far Far Away 2

implementation, strings

Help General

constructive algorithms, greedy, implementation

Amusing Joke

implementation, sortings, strings

New Year Cards

brute force, greedy, implementation

Wallpaper

implementation, math

Petr and Book

implementation

Literature Lesson

implementation

Last Chance

data structures, implementation, strings

Postcards and photos

implementation

Ternary Logic

implementation, math

Presents

implementation

Cycle

brute force, dfs and similar, implementation

Replacement

greedy, implementation, sortings

Average Numbers

brute force, implementation

Unary

implementation

HQ9+

implementation

Piet

implementation

Turing Tape

implementation

Opposites Attract

implementation, math

cAPS lOCK

implementation, strings

Gnikool Ssalg

*special problem, implementation, strings

Hexagonal numbers

*special problem, implementation

Students and Shoelaces

brute force, dfs and similar, graphs, implementation

Cookies

implementation

Numbers

constructive algorithms, implementation

String

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

Canvas Frames

implementation

Simple XML

implementation

Permutations

brute force, combinatorics, implementation

Prime Permutation

implementation, number theory, strings

Lucky Substring

brute force, implementation

Lucky Segments

binary search, implementation, two pointers

Lucky Sum

implementation

Boom

implementation

Winnie-the-Pooh and honey

implementation, math

Quiz League

implementation

Elevator

brute force, implementation, math

Before Exam

constructive algorithms, implementation, sortings

Epic Game

implementation

Present from Lena

constructive algorithms, implementation

String Task

implementation, strings

Tree or not Tree

data structures, divide and conquer, implementation, trees

Elevator

implementation, math

Little Pigs and Wolves

greedy, implementation

Tram

implementation

Sleeping

combinatorics, implementation, math

Grammar Lessons

implementation, strings

Petya and Square

implementation, math

Petya and Strings

implementation, strings

Nearly Lucky Number

implementation

Lucky Sum of Digits

brute force, implementation

Palindromic Times

implementation, strings

Treasure Island

brute force, implementation

Choosing Laptop

brute force, implementation

Card Game

implementation

Entertaining Geodetics

brute force, dsu, implementation

Item World

brute force, implementation, sortings

Transmigration

implementation

Blackjack

implementation

Testing Pants for Sadness

greedy, implementation, math

Sum of Digits

implementation

Vectors

implementation, math

Battleship

*special problem, dfs and similar, implementation

Name the album

*special problem, data structures, implementation

Polynom

*special problem, implementation

A+B

*special problem, implementation

Friendly Numbers

*special problem, implementation

Carpeting the Room

*special problem, implementation

Help Chef Gerasim

implementation, sortings

Help King

implementation, probabilities, trees

Help Victoria the Wise

brute force, implementation

Robot in Basement

bitmasks, brute force, implementation

Domino

brute force, implementation

Football

implementation, strings

Hockey

implementation, strings

Friends

graphs, implementation, math

Restoring Password

implementation, strings