Post here if you don't find any other place for your post. But please, stay on-topic: algorithms, programming or something related to this web site and its services.
Today 28.09.2002 someone sent about 400 files with one task...
And all the files gave TLE.
There would be nothing wrong but no one else could sent any tasks (there were about 140 jobs waiting for compile and waiting for run)
Hmm.. I think that judge should do something with this especially for new accounts..
There should be some limit on the number of task sent form one account..
Otherwise anyone can create an account and simply flood this server.
I think that something should be done with this .. (It is not very nice to wait 50 minutes (or longer) until your program can run )
i just got the ans after submitting a problem 2 hrs ago...
it's very disgusting and i also noticed that someone is submitting problem no. 414 one after another...
so proper actions should be taken.
and i have to tell something more...
that the secuirity of this site is very poor. two weeks ago one of my friends account was hacked and the person (hacker) changed the name, email and password...
so security system should be improved
(and i can remember about 1 year ago someone hacked the no.1 (in the ranklist then) 's account info)
and is there any way so that i can protect my account from being hacked?
Its really digusting that people take advantage of this free OJ that people have put alot of work into. To think that person flooded the judge with TLE entries is a sad thought. On another note, maybe related to the high volume of submission, my program ran in "nan" time. I read about the problem, but the last post i saw was last year.
Last post about what? If you refer to 'nan' then it is still actual problem and it is not known why it occurs. What was your problem no. on which you got 'nan' time?
Ivor
There is a theory which states that if ever anyone discovers exactly what the Universe is for and why it is here, it will instantly disappear and be replaced by something even more bizarre and inexplicable.
The problem no was 836. I sumbitted the problem while the judge was being flooded.
I checked my mail after and hour or so and it said i got nan time. As such i can't tell what the status showed.
The last referred to the last post i saw about nan.
OJ translates 'nan' as 0.000 so your time might have been in the range 0.000-0.050. Send it again and you'll get the time. btw... to prove yourself worthy a rank you got, you'll now have to solve it 0.000 time.
Ivor
There is a theory which states that if ever anyone discovers exactly what the Universe is for and why it is here, it will instantly disappear and be replaced by something even more bizarre and inexplicable.
I am aware of what has happened today. I've been watching the system until it got normal, and we've taken some measures to prevent this from happening again.
In particular, you won't be able to send any sourcecode if you have sent ~5 (the way we count them may be not very exact) and they haven't been judged when the new one is received. This means that, when the server is busy, only ~5 problems of each user will enter the queue. If you try to send any other source in this situation, you'll get "SUBMISSION ERROR (TOO MUCH SUBMISSIONS)". When one of those ~5 problems of yours is judged, you'll be allowed to send another one. Note that SE problems won't be judged when the queue is empty, they will be ignored, so the queue will empty faster. This is true for both email and submit-o-matic methods. In this way, we think we're going to be able to prevent this situation from now on.
About hacking accounts, firstly, it depends on the quality of the password you have chosen. Then, there are some people who forgets his/her password and asks us for them. Until now, we were making a few checks about emails and so on, because there is not a way to check the identity of that person with 100%-fiability. From last week, we ask that person to prove his identity with as much information as he/she can give us, or we don't give them access to that accounts.
About NAN, still no answer for that. One user of this system is trying to help us locating the bug, but we don't know yet what may be happening.
About this system and abuses, there is really few things that I can say. We do our best to make it work...
)
