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

Video GameShefin is playing a game. In this game there are N buildings numbered from 1 to N. Each building has...

MSIS!Do you know what MSIS is? MSIS is the abbreviation for Maximum Sum Increasing Subsequence. It is a ...

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

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

My Small NumberYou are given two integers N and M. Find another integer X divisible by M that has the same number ...

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

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...

Is Bita Happy?Bita has learned bitwiseoperations recently. She is doing some experiments with these operations no...

Poltu and Interesting NumberPoltu Loves interesting number. So he wants to find this type of number. The definition of an inter...

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

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...

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

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...

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...

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

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...

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...

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

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

Orchid DivisionQuido has a square orchard full of various fruit and nut trees. The trees are planted in regular row...

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

Game of TicTacToeAlice and Bob is a playing a game of tictactoe, to be precise a variant of tictactoe called Nota...
