For the TopCoder Open, I'm presently fourth-in-room for Qualification Problem Set 10. The top 50 in each room pass. Why am I worried? Because I'm certain my 1100, submitted for 400something points, will fall.
That's not pessimism, that's submitting it after failing an example case. Subtracting its 400something points puts me in 35th in room.
At least competitors are distributed evenly, so 150 more people will have to sign up to kick me off, and all of the ones who fall in Qual Room 10 will have to do better than my mediocre 170something on the 200. I've got a good chance at the "Congrats, You Qualified!" free T-shirt.
As for why I submitted the program when I know it's bogus: To ask the Writer, or just someone who understands the problem, what I botched. I had to submit so it would be on the site; I figured I was unlikely to miraculously find the bug, fix it, recompile, test it, and then submit it in the 15 seconds I had remaining, so I threw it up while I could so I'll be able to show off my big algorithmic screw-up later and ask what I did wrong.
Obviously, I can't say what the problems are until the qualification round closes.