The Hidden IslandIt is believed that the hidden island of TreasureLand has many unsolved mysteries and undiscovered t...

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

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

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

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

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

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

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

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

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

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

Quarantiko“If you feel unwell, stay home.” Riaz has created a special encryption algorithm named Quarantiko to...

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... 
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...

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...
