PasswordsAlice wants to extract some passwords from a random string. A pa... 
T5 RacingIt is high time for the annual T5 racing and your team is planni... 
Game of PalindromesIn a popular computer game, Game of Palindromes also known as GO... 
Counting MurgisEver since that wicked thief took away some of her murgis (hens,...

Game of TicTacToeAlice and Bob is a playing a game of tictactoe, to be precise ... 
Unique ReliefThanos has now figured out how to visit all the houses in the fl...

Paranoid TradingYou have been newly appointed as the accountant of Michael Corle...

Very Dirty StringStrings are difficult, most of the contest programmers say this ... 
Easy Sequence 1Let’s define an easy sequence F. Where $ F(1) = 1 $ $ F(2X) = ...

Easy Sequence 2Let’s define a easy sequence F. Where $ F(1) = 1 $ $ F(2X) = F...

Diagonal SumGiven an N*N size matrix, you have to rearrange the elements of...

BuildingsThere are n buildings in a row. The height of the i’th building ...

Flow on TreeMr. Kaboom has recently learned about maximum flow. Now his frie...

Polygon Construction (Hard)Meera in going to picnic with her friends. They are going to hav...

Third DimensionMr. J wants to learn about combinatorics. He started reading a b...

No GCDYou are given N integers. Each integer is square free (i.e. it h... 
OCD Returns!This problem author has OCD (obsessive–compulsive disorder). One... 
The Game of RocksAlice and Bob have come up with a new game. Bob gives Alice a N...

Gaaner KoliThe protagonists of this problem are two great programmers of a ...

Flyover in TwinlandRio has become the president of Twinland. Now he wants to develo...

The Perfect CollectionGiven an array A of N integers, if we choose any K of these inte... 
Darth Vader and 3PO on a Tree!Did you watch Star Wars yet? No? You should in your free time. ... 
Sticking PinsYou are sticking pins on a 2D board at N given coordinates. Howe...

Smart Feature Phone 2Alice worked in CIA. Right now he need to send an encrypted me...

Perseus and The New ChallengeThe life of princess Andromeda, the daughter of King Cepheus and...

Dominoes ForeverOnce when I was little, my father took me to a tobacco shop! It ...

Pathetic Interview IIYou all know about the story of Pathetic InterviewI. Today, I a... 
Road Minister TechboyTechboy is appointed as the minister of roads and highway in his... 
Burger KingEvery day, more than 11 million guests visit BURGER KING® restau...

Game of StringsRedoan is very fond of strings. He wants to go on a spree of sol... 
Harry Potter and the Vault of Gringotts“There was a breakin of Gringotts Wizarding Bank on 1 May, 1998...

Alice in CandylandAlice came up with a new game. In this game called “Candy Quest”... 
Dynamic Programming

Greedy Algorithm

Matrix Exponentiation
