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 amoun...
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...
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 lette...
Find the Good Sequence
Let's say two numbers are called "good" if their difference is at least 2. Similarly, a sequence is ...
Jontrona of Liakot
Liakot, the king of Cox's Bazar, is currently in a dire situation. His own younger sister Ayesha is ...
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 of C...
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...
Dominoes Forever
Once when I was little, my father took me to a tobacco shop! It is surprising, but true. He asked th...
Road Minister Techboy
Techboy is appointed as the minister of roads and highway in his country Better-Not-Name-It. Now he ...
Game of Strings
Redoan is very fond of strings. He wants to go on a spree of solving string problems. His own teamma...
Problem Setter Crisis
Competitive Programming is very popular in Leading University. There are many great achievements of ...
Estimation of Techboy
Techboy works in a software company. He codes in Node.js and React. Every now and then he has to giv...
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