Months ago i solved a problem but i cant remember its name the task description is about a soda can's where there are a group of friends consist of five friends in a line to buy the soda and after the first person buy a soda he go to the end of the line and be doubled, hope you help me plz, sorry for bad description :)
82A - Double Cola
How can you actually remember the problem
I saw it not too long ago. I remembered about as much as the OP but also that it was about the big bang theory. So I searched for "sheldon codeforces".