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

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

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

Assigning WorkstationsPenelope is part of the admin team of the newly built supercomputer. Her job is to assign workstati...

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

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

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

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

String Is Not That EasyLet's consider a string S which is obtained by concatenating the nonnegative integers from 0 to...

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

Subset ANDYou are given an array A of n integers and an integer k. You need to find if there is any nonempty ...

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

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

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

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

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

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

Flyover in TwinlandRio 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 SumGiven an N*N size matrix, you have to rearrange the elements of the matrix in such a way that the d...
