The Perfect Collection
Given an array A of N integers, if we choose any K of these integers and calculate their bitwise XOR...
Gaaner Koli
The protagonists of this problem are two great programmers of a certain institution Omanush and Ordi...
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...
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(...
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)×F(X+1)+2 Here X is a posit...
OCD Returns!
This problem author has OCD (obsessive–compulsive disorder). One day his teacher gave him an array o...
No GCD
You are given N integers. Each integer is square free (i.e. it has no divisor which is a square numb...
Third Dimension
Mr. J wants to learn about combinatorics. He started reading a book on combinatorics and came across...
Polygon Construction (Hard)
Meera in going to picnic with her friends. They are going to have lots of fun. They will be doing va...
m-Beautiful Numbers
An m-Beautiful Number is a number which is divisible by $m$ and the sum of the digits is also divisi...
Inversions and Goodbye
It's time to say goodbye to CSEmpur, at least for today. And so you wanted to give the citizens of C...
Penguins of Madagaskar
You all heard about the Penguins of Madagaskar. They work for the penguin kind and loves cuteness. O...
Oishi Teacher and Her Naughty Class
Oishi teacher has returned to her class after the tiffin break. She noticed that some students who r...
Shrink the Array
You have an array of size N which contains positive integers. You can apply the following operation ...
A Journey Towards One
Given N. You can perform 3 types of operations: Increase N by 1. Decrease N by 1. Divide N by 2, av...
Sgt. Laugh
That's it. Sgt. Laugh has had enough. He is determined to end the evil military reign of General Cry...
Video Game
Shefin 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 s...
Milad's Lost Tree
Milad likes trees so much. He has a rooted tree with $n$ vertices each of which has some non-negativ...
Random Graphs
This problem is very easy. There's a graph of $N$ nodes. Each edge $u-v$ ($u >= v ; u = v$ is possib...
Chocolate
There is a shop named Chocolove in the Codeland. There are many chocolates in the shop. Each chocola...
Make Strings Great Again!
Do you know what is a sub-sequence? A sub-sequence is a sequence that can be derived from another se...
Distinct Permutations
You are given two binary strings A and B. Recall that binary string is a non-empty sequence of chara...
Is This a Give-Away?
Once there lived an ancient mage named Farabi. He could always give perfect weather forecast. He nev...
I Hate Combinatorics!
Rick and Morty are being hunted by the galactic government. They ran away to the cell dimension. The...
Toph uses cookies. By continuing you agree to our Cookie Policy.