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From: Andrew Makhorin
Subject: Re: [Bug-glpk] HELP - INTEGER PROBLEM
Date: Fri, 18 Oct 2013 15:14:06 +0400

On Fri, 2013-10-18 at 11:53 +0200, Daniele Recchia wrote:
> Hi, 
> I'm Daniele, an italian student who is doing a project with GLPK. I've
> a problem: my problem is with binary variables. It has 60 constraints,
> but in the resolution GLPK delete 10 constraints after a
> Preprocessing: why does it happen? The deleted constraints aren't
> redudant. I'm doing Java. The result is it:
> 60 rows, 500 integer variables, 500 non-zeros
> 500 integer variables, all of which are binary
> Preprocessing...
> 50 rows, 500 integer variables, 500 non-zeros
> Here, there is the result, but wrong. 

Probably you forgot to attach the results.

Please write your mip instance in lp or glpk format, gzip it and post it
to me (not to the list). Thanks.

BTW, you may try to disable the preprocessor.

Andrew Makhorin

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