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## Discussion of Problem 1836. Babel Fish

Test #2
Posted by Vitaliy Karelin 30 Apr 2011 15:52
What's wrong with this test?
Re: Test #2
Posted by Ronnie 30 Apr 2011 21:13
i have the same question. what's the catch?

and what's with the "ambiguous" case? how can it be ambiguous?
Re: Test #2
Posted by AterLux 1 May 2011 02:14
When tank angled too much, one or more of sensors will show 0.
If 3 or 2 neighboring sensors shows 0, then you cant determine the angle, but at whole data is not erroneous, so you shall output "ambiguous"

for exampe
10 0 1 1 0  - ambiguous
10 0 1 0 1  - error
10 0 0 0 0  - 0.0
10 0 1 3 1  - 104.166667 (not error!)
10 0 1 3 2  - 150.0
10 0 1 5 3  - 202.083333
10 0 1 3 5  - error

Edited by author 01.05.2011 03:36
Re: Test #2
Posted by bsu.mmf.team 1 May 2011 02:33
OMG, my program passed all these tests, but still WA#2. Do you have any other tricky tests?
Re: Test #2
Posted by AterLux 1 May 2011 02:40
I don't know ;)
naive o^2 * (h1 + h2 + h3 + h4) / 4 will pass test #2 (with checking erroneous data preliminarily of course) and will WA only at #3
try swap data, like this:
10 0 1 3 2
10 2 0 1 3
10 3 2 0 1
10 1 3 2 0
etc.

Edited by author 01.05.2011 02:41
Re: Test #2
Posted by bsu.mmf.team 1 May 2011 03:03
Of course, I considered this case. Now I have WA#4. This test helped me a little:
1000000 1000000 1000000 1000000 1000000 -> 1000000000000000000.000
I guess, there are exists such tests, where, while calculating the volume, the itermediate calculations exceed 2^64. The reason of WA seems to be this.
P.S. Don't like Java :)
Re: Test #2
Posted by sklyack 5 May 2011 16:25
bsu.mmf.team, did you find the mistake? What is it?

Edited by author 05.05.2011 16:26
Re: Test #2
Posted by AterLux 5 May 2011 18:36
I've used extended (in Pascal) to perform all calculations. But I think precision of double also enough to perform it, because required "relative error of at most 10^6".

I hope you're not using integers of any size to perform real-number calculations? ;)

---

I've just sent my solution replacing extended to double - it still have AC.
But when I replaced it again to single (Pascal) - I got WA #4.

So, if you using float (in Java) you have to replace it with double

Edited by author 05.05.2011 18:40
Re: Test #2
Posted by bsu.mmf.team 6 May 2011 19:27
Yes, I found my mistake. I got AC after I changed my function, which checks if 4 points lie on the same plane. I rewrote it using only integer calculations.
Re: Test #2
Posted by kaysar_buet08 30 Jun 2011 10:29
what the wrong with test case  2 ,passing all of the forum :(.help pls..!!
Re: Test #2
Posted by svr 25 Oct 2011 10:45