EkupaiHacker robot Ekupai is trying to hack a supercomputer. He needs a cheat code X to hack this computer...

The Perfect CollectionGiven an array A of N integers, if we choose any K of these integers and calculate their bitwise XOR...

EasyThis problem is very easy. As my mood is not so good, I will not elaborate the statement unnecessari...

Train HijackYou and your friend Daneliya Tuleshova are planning to hijack a train. Your friend will go inside a...

Find NSUPSGiven a string $s$, find the number of subsequence in $s$ which forms the word “NSUPS”. A subsequenc...

Convert String Into PalindromeA palindrome is a word, number, phrase, or other sequence of characters which reads the same backwar...

A Journey Towards OneGiven N. You can perform 3 types of operations: Increase N by 1. Decrease N by 1. Divide N by 2 (O...

OCD Returns!This problem author has OCD (obsessive–compulsive disorder). One day his teacher gave him an array o...

Burger KingEvery day, more than 11 million guests visit BURGER KING® restaurants around the world. And they do ...

Harry Potter and the Vault of Gringotts“There was a breakin of Gringotts Wizarding Bank on 1 May, 1998, during the height of the Second Wi...

Naming ConventionTony works in a multinational technology company named Voogle LLC. The employees of Voogle follow ce...

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

LIDSWe all know about LIS ( Longest Increasing Sub sequence). The task to find the length of the longest...

Counting MurgisEver since that wicked thief took away some of her murgis (hens, that is), Meena was ever anxious th...

Penguins of MadagaskarYou all heard about the Penguins of Madagaskar. They work for the penguin kind and loves cuteness. O...

Messy TableAkib is a very good student but his reading table is very messy. One Friday afternoon, Akib is sitti...

I Hate Combinatorics!Rick and Morty are being hunted by the galactic government. They ran away to the cell dimension. The...

Polygon Construction (Hard)Meera in going to picnic with her friends. They are going to have lots of fun. They will be doing va...

Third DimensionMr. J wants to learn about combinatorics. He started reading a book on combinatorics and came across...

No GCDYou are given N integers. Each integer is square free (i.e. it has no divisor which is a square numb...

Easy Sequence 1Let’s define an easy sequence F. Where $ F(1) = 1 $ $ F(2X) = F(X)^2 + 1 $ $ F(2X+1) = F(X) \time...

The Game of RocksAlice and Bob have come up with a new game. Bob gives Alice a NxM grid that contains N rows and M c...

Gaaner KoliThe protagonists of this problem are two great programmers of a certain institution Omanush and Ordi...

Sticking PinsYou are sticking pins on a 2D board at N given coordinates. However, since you are not very good at ...

Smart Feature Phone 2Alice worked in CIA. Right now he need to send an encrypted message to the headquarter(HQ) of CIA....

Perseus and The New ChallengeThe life of princess Andromeda, the daughter of King Cepheus and Queen Cassiopeia of Ados, is in dan...

Dominoes ForeverOnce when I was little, my father took me to a tobacco shop! It is surprising, but true. He asked th...

Pathetic Interview IIYou all know about the story of Pathetic InterviewI. Today, I am sharing a story of my close friend...

Alice in CandylandAlice came up with a new game. In this game called “Candy Quest”, there is a NxN size 2D grid. In ea...

Subarray SumYou are given an array having N integers. You have to select at most K positions in the array and re...

Maximum SumLittle Jimmy loves to play with numbers. One day he was playing with a number sequence. In his game,...

Very Dirty StringStrings are difficult, most of the contest programmers say this and try to avoid string algorithms. ...
