Make It Big!

You are given a number N (10 ≤ N ≤ 2×109). You have to perform exactly two swap operation. You can c...

Burger King

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

Train Hijack

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

Third Dimension

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

Easy Sequence 2

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

Convert String Into Palindrome

A palindrome is a word, number, phrase, or other sequence of characters which reads the same backwar...

MSIS!

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

Fivefold Removals

Alice and Bob are playing a simple game on marbles. They have a bucket containing N marbles, and 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...

No GCD

You 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 1

Let’s define an easy sequence F. Where F(1) = 1 F(2X) = F(X)^2 + 1 F(2X+1) = F(X) \times F(X+1) + 2 ...

The Game of Rocks

Alice and Bob have come up with a new game. Bob gives Alice a NxM grid that contains N rows and M co...

Gaaner Koli

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

The Perfect Collection

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

Sticking Pins

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

Smart Feature Phone 2

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

Perseus and The New Challenge

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

Dominoes Forever

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

Pathetic Interview II

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