Is Bita Happy? Bita has learned bitwise-operations recently. She is doing some experiments with these operations no... |
Happy Sub-Sequence Recently Alex has participated in a programming contest. He became 1st runner up. He couldn't solve ... |
Naughty Subsequence - V2.0 Mahib loves ‘Naughty Subsequence’-s. He will give you an array of characters ara[0,1,...,n-1] that c... |
Poltu and Interesting Number Poltu Loves interesting number. So he wants to find this type of number. The definition of an intere... |
Memes vs. Social Media In this era of modern technology social media is the most powerful weapon and the viral issue is the... |
Train Hijack You 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... |
Is This a Give-Away? Once there lived an ancient mage named Farabi. He could always give perfect weather forecast. He nev... |
Distinct Permutations You are given two binary strings A and B. Recall that binary string is a non-empty sequence of chara... |
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... |
m-Beautiful Numbers An m-Beautiful Number is a number which is divisible by $m$ and the sum of the digits is also divisi... |
Chocolate There is a shop named Chocolove in the Codeland. There are many chocolates in the shop. Each chocola... |
Random Graphs This problem is very easy. There's a graph of $N$ nodes. Each edge $u-v$ ($u >= v ; u = v$ is possib... |
Milad's Lost Tree Milad likes trees so much. He has a rooted tree with $n$ vertices each of which has some non-negativ... |
MSIS! Do you know what MSIS is? MSIS is the abbreviation for Maximum Sum Increasing Subsequence. It is a s... |
Video Game Shefin is playing a game. In this game there are N buildings numbered from 1 to N. Each building has... |
Sgt. Laugh That's it. Sgt. Laugh has had enough. He is determined to end the evil military reign of General Cry... |
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... |
Shrink the Array You have an array of size N which contains positive integers. You can apply the following operation ... |
Oishi Teacher and Her Naughty Class Oishi teacher has returned to her class after the tiffin break. She noticed that some students who r... |
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... |