Passwords
Alice wants to extract some passwords from a random string. A password can have any number of charac...
Find the Good Sequence
Let's say two numbers are called "good" if their difference is at least 2. Similarly, a sequence is ...
Permutations and Divisors
Let P be a permutation of length n where each value from 1 to n occurs exactly once. A subsequence o...
Lexicographical Smallest String
There is a string $s$ of length $n$ containing lowercase letters and an integer $k$. Among the lette...
Train Hijack
You and your friend Daneliya Tuleshova are planning to hijack a train. Your friend will go inside a...
Find NSUPS
Given a string s, find the number of subsequence in s which forms the word "NSUPS". A subsequence is...
Fantastic Food
As we all know that Alice and Bob just landed in Fantastic World and are going to stay for the next ...
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...
Problem Setter Crisis
Competitive Programming is very popular in Leading University. There are many great achievements of ...
Birthday Gifts
Today is Luke's birthday. Mr. Phil Dunphy (Luke's father) has thrown a birthday party for him and de...
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...
Hardest Problem Ever
Prof.Dr.DP is very famous professor. He is expert (actually legendary grandmaster) in Dynamic Progra...
Remember-Remainder
Zarin is a sadist. She loves to give problems to her close people. Today she gives you an array cons...
Ekupai
Hacker robot Ekupai is trying to hack a supercomputer. He needs a cheat code X to hack this computer...
Game of Strings
Redoan is very fond of strings. He wants to go on a spree of solving string problems. His own teamma...
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 ...
Estimation of Techboy
Techboy works in a software company. He codes in Node.js and React. Every now and then he has to giv...
Disturbing Students
N students were gathered in front of CSEmpur gate. They wanted to take a tour of the famous CSEmpur ...
Dominoes Forever
Once when I was little, my father took me to a tobacco shop! It is surprising, but true. He asked th...
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...
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...
Road Minister Techboy
Techboy is appointed as the minister of roads and highway in his country Better-Not-Name-It. Now he ...
Déjà Vu
Thor, the Thunder God is fighting a horde of monsters in a cave. The cave is so narrow that it can b...
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