Passwords

Alice wants to extract some passwords from a random string. A password can have any number of charac...

Hardest Problem Ever

Prof.Dr.DP is very famous professor. He is expert (actually legendary grandmaster) in Dynamic Progra...

Buildings

There are n buildings in a row. The height of the i'th building is hi. You have ৳k. It is the am...

Assigning Workstations

Penelope is part of the admin team of the newly built supercomputer. Her job is to assign work-stati...

Déjà Vu

Thor, the Thunder God is fighting a horde of monsters in a cave. The cave is so narrow that it can b...

Ekupai

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

Fantastic Food

As we all know that Alice and Bob just landed in Fantastic World and are going to stay for the next ...

Train Hijack

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

String Is Not That Easy

Let's consider a string S which is obtained by concatenating the non-negative integers from 0 to...

Permutations and Divisors

Let P be a permutation of length n where each value from 1 to n occurs exactly once. A subsequence o...

Subset AND

You are given an array A of n integers and an integer k. You need to find if there is any non-empty ...

Remember-Remainder

Zarin is a sadist. She loves to give problems to her close people. Today she gives you an array cons...

Lexicographical Smallest String

There is a string s of length n containing lowercase letters and an integer k. Among the letters tho...

Find the Good Sequence

Let's say two numbers are called "good" if their difference is at least 2. Similarly, a ...

Disturbing Students

N students were gathered in front of CSEmpur gate. They wanted to take a tour of the famous CSEmpur ...

Inversions and Goodbye

It's time to say goodbye to CSEmpur, at least for today. And so you wanted to give the citizens ...

Flow on Tree

Mr. Kaboom has recently learned about maximum flow. Now his friend Mr. Taboom gave him this problem....

Flyover in Twinland

Rio has become the president of Twinland. Now he wants to develop his country to fulfill his promise...

Darth Vader and 3PO on a Tree!

Did you watch Star Wars yet? No? You should in your free time. Now back to Darth Vader and 3PO. Dart...

Diagonal Sum

Given an N*N size matrix, you have to re-arrange the elements of the matrix in such a way that the d...