Discussion @ 1265. Mirror @ Timus Online Judge

C and Pascal

Posted by Burunduk1 29 Sep 2005 13:05

There are 2 same solutions (C, Pascal).
C solution gets WA, 9
Pascal solution gets AC

Why??? Please, give me some hints about it.

I think it's precision problems )

Posted by Ivankov Dmitry 29 Sep 2005 22:02

For example (sizeof(long double) == 8)

Re: I think it's precision problems )

Posted by Burunduk1 29 Sep 2005 22:28

I thought it's so only in Visual C.
GNU C and Borland C compilers use sizeof(long double) = 10.
Am I right?

Re: I think it's precision problems )

Posted by Ivankov Dmitry 29 Sep 2005 22:54

Yes.
But as far as I know Intel C++ compiler is used there. And in ICL (at least in 8.1) sizeof(long double)==8

This problem suppose using of long arithmetics (-)

Posted by Vladimir Yakovlev (USU) 29 Sep 2005 22:57

Re: This problem suppose using of long arithmetics (-)

Posted by Burunduk1 30 Sep 2005 00:14

Of course!
But solution without it is more short and beauty. :)
And it's more interesting to solve problem
using only Extended.

Re: This problem suppose using of long arithmetics (-)

Posted by svr 4 Feb 2007 14:24

But if juri suppose exact numbers
when answer is unequivocal it would be funny
try adjust eps-heuristics. Next time you would be killed by
rejujement.
I have Ac using 120-digits integers and dot-product as angle haracteristics. Thus use only +,-,*,<,==.

Re: This problem suppose using of long arithmetics (-)

Posted by Vedernikoff Sergey 6 Feb 2007 13:38

My program doesn't use any long arithmetics - only standard Pascal's real (or extended?) type, and it hasn't any problem with accepting this problem. If jury assumed using long arithmetics, then testset is very weak...

Re: This problem suppose using of long arithmetics (-)

Posted by DixonD (Lviv NU) 13 Apr 2007 17:25

Could anybody say me how find point, symmetrical to given point relatively some line?
Without division...
Thanks

Discussion of Problem 1265. Mirror