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/* cfg2.c (conflict graph) */
/***********************************************************************
* This code is part of GLPK (GNU Linear Programming Kit).
* Copyright (C) 2015-2016 Free Software Foundation, Inc.
* Written by Andrew Makhorin <mao@gnu.org>.
*
* GLPK is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GLPK is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
* License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GLPK. If not, see <http://www.gnu.org/licenses/>.
***********************************************************************/
#include "cfg.h"
#include "env.h"
#include "prob.h"
/***********************************************************************
* NAME
*
* glp_cfg_init - create and initialize conflict graph
*
* SYNOPSIS
*
* glp_cfg *glp_cfg_init(glp_prob *P);
*
* DESCRIPTION
*
* This routine creates and initializes the conflict graph for the
* specified problem object.
*
* RETURNS
*
* The routine returns a pointer to the conflict graph descriptor.
* However, if the conflict graph is empty (no conflicts have been
* found), the routine returns NULL. */
glp_cfg *glp_cfg_init(glp_prob *P)
{ glp_cfg *G;
int j, n1, n2;
xprintf("Constructing conflict graph...\n");
G = cfg_build_graph(P);
n1 = n2 = 0;
for (j = 1; j <= P->n; j++)
{ if (G->pos[j])
n1 ++;
if (G->neg[j])
n2++;
}
if (n1 == 0 && n2 == 0)
{ xprintf("No conflicts found\n");
cfg_delete_graph(G);
G = NULL;
}
else
xprintf("Conflict graph has %d + %d = %d vertices\n",
n1, n2, G->nv);
return G;
}
/***********************************************************************
* NAME
*
* glp_cfg_free - delete conflict graph descriptor
*
* SYNOPSIS
*
* void glp_cfg_free(glp_cfg *G);
*
* DESCRIPTION
*
* This routine deletes the conflict graph descriptor and frees all the
* memory allocated to it. */
void glp_cfg_free(glp_cfg *G)
{ xassert(G != NULL);
cfg_delete_graph(G);
return;
}
/* eof */
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