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## Discussion of Problem 1344. Gigantic Turnip

Report of the wrong test data 8 (+)
Posted by Safe Bird 26 Feb 2005 18:59
I did so in the program:

void GoWrong()
{
int a = 0;
fprintf(Fou,"%d",1/a);
}

for (i=1; i<=n; i++)
fscanf(Fin,"%*d %d %d %d", p[i], p[i]+1, p[i]+2);
for (i=1; i<=n; i++) for (j=0; j<3; j++) if (p[i][j]>0)
if ( p[p[i][j]][0]!=i && p[p[i][j]][1]!=i && p[p[i][j]][2]!=i ) GoWrong();

and i really got RE(divided by 0). I think such testcase is illeagle. BTW if I use "if n=9 then writeln('2.0000')" I'll get AC.
Fixed (+)
Posted by Vladimir Yakovlev (USU) 27 Feb 2005 18:11
There was an error in input of test 8.
I fixed it. Your first submit is AC now.
:)thanx (-)
Posted by Safe Bird 27 Feb 2005 20:11

Edited by author 03.03.2006 17:38
Are tests OK now?
Posted by Michael Rybak (accepted@ukr.net) 2 Mar 2006 21:06
I have exactly the same problem on test 20. I figured out (with binary search on what assertions failed) that some rope isn't matched, and after that I read your message, and, just for the sake of being precise, rewrote my code in the following way, copypasting from yours:

#define ASSERT(x) if (!(x)) while (1) cout << 1;else 1

...

int t[1000][4];
int n;

int main()
{
int i, j;
cin >> n;
for (i=1; i<=n; i++)
scanf("%*d %d %d %d", t[i], t[i]+1, t[i]+2);
for (i=1; i<=n; i++) for (j=0; j<3; j++) if (t[i][j]>0)
if ( t[t[i][j]][0]!=i && t[t[i][j]][1]!=i && t[t[i][j]][2]!=i )
ASSERT(false);

...
}

This code gets Output Limit Exceeded on test 20. Replacing ASSERT(false) with ASSERT(true) in that line makes it get Crash at test 20, which means this exact assertion has failed.

[EDITED BY RYBAK]
The story looks very similar. Instead of ASSERT(false) I wrote:

{
cout << "1.0000";
return 0;
}

and got AC. Still I wonder how everyone else treat such situation?

Safe Bird wrote 27 February 2005 20:11

Edited by author 02.03.2006 21:15
Yes, test 20 is wrong!
Posted by Walrus 21 Jul 2006 00:55
Judges, pls correct test 20!
Posted by TO THE TOP 17 Mar 2008 16:30
People must have a chance to AC this problem not reading forum before ))
Re: Judges, pls correct test 20!
Posted by Vedernikoff Sergey 17 Mar 2008 22:00
I think, tests were corrected - I've ACed the problem without reading forum =)
Re: Judges, pls correct test 20!
Posted by TO THE TOP 18 Mar 2008 17:07
It doesn't mean anything. In 20 test there is a block A, which connected to block B, but block B doesn't connect to block A.