At flooble there are 40 problems in the queue. (this may not be true but lets just pretend it is.) A few crazy hackers somehow manage to promote themselves to scholars. On the first day the first hacker will vote thumbs up on all problems displayed.(The 10 most recent) On the second day the second hacker votes thumbs down on every second problem. On the third day the third hacker votes thumbs up on every third problem. And so on and so on. (When it gets to the eleventh day the eleventh hacker will do what the first hacker did)

How many days will it take for every problem in the queue to be live on the site?

Note: For those who don't know there are only 10 problems that can be voted thumbs up or thumbs down every day and these problems are the 10 least recent. Also a problem with three thumbs up will be posted to the site and taken out of queue. Only one problem can be posted to the site per day. Also if a problem gets 3 thumbs down it is deleted.

Btw: for those who like an extra challenge what if one problem is submitted every 3 days?

Also: A hacker will always vote before a problem becomes live.

(In reply to Seeing as how by Alan)

I'm not sure if I fully understand your question. We've already shown that the 'extra challenge' never finishes, so by submitting (adding) problems at a greater rate then it still won't finish.

If by 'submitting' you mean 'posting', then I've made the change to allow two problems to be posted per day. Perversely, this actually increases the time it takes to go through the original 40 problems to 201 days. I've checked it through and can't see any obvious errors, so I'm interested to know whether Charlie comes up with the same answer.

Posted by fwaff on 2003-03-12 23:11:48