Flyover in Twinland

Rio has become the president of Twinland. Now he wants to develo...

Problem Setter Crisis

Competitive Programming is very popular in Leading University. T...

Passwords

Alice wants to extract some passwords from a random string. A pa...

Flow on Tree

Mr. Kaboom has recently learned about maximum flow. Now his frie...

Darth Vader and 3PO on a Tree!

Did you watch Star Wars yet? No? You should in your free time. ...

Diagonal Sum

Given an N*N size matrix, you have to re-arrange the elements of...

Road Minister Techboy

Techboy is selected as a minister of roads and highway in his c...

Game of Strings

Redoan is very fond of strings. He wants to go on a spree of sol...