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

BAPGRussell loves solving math problems and also playing online games. Recently, he has started playing ...

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

Find the Good SequenceLet’s say two numbers are called “good” if their difference is at least 2. Similarly, a sequence is ...

Who Ate the Pizza Slices?Misty’s life is very dramatic. No matter how careful she is, some interesting and sometimes unfortun...

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...

Road Minister TechboyTechboy is appointed as the minister of roads and highway in his country BetterNotNameIt. Now he ... 
Game of StringsRedoan is very fond of strings. He wants to go on a spree of solving string problems. His own teamma...

Problem Setter CrisisCompetitive Programming is very popular in Leading University. There are many great achievements of ...

Estimation of TechboyTechboy works in a software company. He codes in Node.js and React. Every now and then he has to giv...

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

Find NSUPSGiven a string s, find the number of subsequence in s which forms the word “NSUPS”. A subsequence is...

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

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 ...

String Is Not That EasyLet’s consider a string S which is obtained by concatenating the nonnegative integers from 0 to 102...
