#define HELPTEXT \ " Read graphs or digraphs and colour their vertices in\n\
all possible ways with colours 0,1,2,... .\n\
Isomorphic graphs derived from the same input are suppressed.\n\ If the input graphs are non-isomorphic then the output graphs are also.\n\
\n\
-e# | -e#:# specify a value or range of the total value of the colours\n\
-m# number of available colours (default 2 if -c not given)\n\
-c#,..,# specify the maximum number of vertices of each colour\n\
The total must at least equal the number of vertices in the input.\n\
-d#,..,# minimum vertex degree for each colour (out-degree for digraphs)\n\
-D#,..,# maximum vertex degree for each colour (out-degree for digraphs)\n\
-d and -D can have fewer colours than -m/-c but not more\n\
-f# Use the group that fixes the first # vertices setwise\n\
-T Use a simple text output format (nv ne {col} {v1 v2})\n\
-o Use sparse6 (undirected) or digraph6 (directed) for output,\n\
provided m=2 and the inputs have no loops.\n\
-u no output, just count them\n\
-q suppress auxiliary information\n"
/* If OUTPROC is defined at compile time, and -u is not used, the * procedure OUTPROC is called for each graph. This must be linked * by the compiler. The arguments are * f = open output file * g = the input graph * col[0..n-1] = the colours * m,n = usual nauty meanings
*/
/* SUMMARY feature * * If SUMMARY is defined, it must expand as the name of a procedure * with prototype void SUMMARY(void). It is called at the end before * the normal summary (which can be suppressed with -q). The numbers of * graphs read and coloured graphs produced are available in the global * variables vc_nin and vc_nout (type nauty_counter).
*/
staticvoid
writeone(FILE *outfile, graph *g, int *col, boolean digraph, int m, int n)
{ int i;
set *gi;
for (i = 0, gi = g; i < n; ++i, gi += m) if (col[i] == 1) ADDELEMENT(gi,i);
if (digraph)
writed6(outfile,g,m,n); else
writes6(outfile,g,m,n);
for (i = 0, gi = g; i < n; ++i, gi += m) if (col[i] == 1) DELELEMENT(gi,i);
}
staticint
trythisone(grouprec *group, graph *g, boolean digraph, int m, int n) /* Try one solution, accept if maximal. */ /* Return value is level to return to. */
{ int i,j;
boolean accept;
graph *gi;
size_t ne; char s[20],*p;
DYNALLSTAT(char,line,line_sz);
staticint
scan(int level, graph *g, boolean digraph, int *prev, long mincols, long maxcols, long sofar, long *colcount, long *mindeg, long *maxdeg, long *deg, int numcols, grouprec *group, int m, int n) /* Recursive scan for default case */ /* Returned value is level to return to. */
{ int left; long min,max,k,ret;
if (level == n) return trythisone(group,g,digraph,m,n);
left = n - level - 1;
min = mincols - sofar - numcols*left; if (min < 0) min = 0;
max = maxcols - sofar; if (max >= numcols) max = numcols - 1; if (prev[level] >= 0 && col[prev[level]] < max)
max = col[prev[level]];
for (k = min; k <= max; ++k)
{ if (colcount[k] <= 0) continue; if (mindeg[k] > deg[level] || maxdeg[k] < deg[level]) continue;
--colcount[k];
col[level] = k;
ret = scan(level+1,g,digraph,prev,mincols,maxcols,
sofar+k,colcount,mindeg,maxdeg,deg,numcols,group,m,n);
++colcount[k]; if (ret < level) return ret;
}
staticvoid
colourgraph(graph *g, int nfixed, long mincols, long maxcols, long *colcount, long *mindeg, long *maxdeg, long *deg, int numcols, int m, int n)
{ static DEFAULTOPTIONS_GRAPH(options);
statsblk stats;
setword workspace[8*MAXNV];
grouprec *group; int i,j,k,nloops;
set *gi,*gj; int lab[MAXNV],ptn[MAXNV],orbits[MAXNV];
boolean loop[MAXNV]; int prev[MAXNV]; /* If >= 0, earlier point that must have greater colour */ int weight[MAXNV]; int region,start,stop;
if (n > MAXNV) gt_abort(">E vcolg: MAXNV exceeded\n");
nauty_check(WORDSIZE,m,n,NAUTYVERSIONID);
nloops = 0; for (i = 0, gi = g; i < n; ++i, gi += m) if (ISELEMENT(gi,i))
{
DELELEMENT(gi,i);
loop[i] = TRUE;
++nloops;
} else
loop[i] = FALSE;
for (region = 0; region < 2; ++region)
{ if (region == 0)
{ if (nfixed == 0) continue;
start = 0;
stop = nfixed; if (stop > n) stop = n;
} else
{ if (nfixed >= n) continue;
start = nfixed;
stop = n;
}
for (i = start, gi = g + m*(size_t)start; i < stop; ++i, gi += m)
{ /* Find most recent equivalent j. */ for (j = i-1, gj = gi-m; j >= start; --j, gj -= m)
{ if (loop[j] != loop[i]) continue; for (k = 0; k < m; ++k) if (gi[k] != gj[k]) break; if (k < m)
{
FLIPELEMENT(gi,i); FLIPELEMENT(gj,j); for (k = 0; k < m; ++k) if (gi[k] != gj[k]) break;
FLIPELEMENT(gi,i); FLIPELEMENT(gj,j);
} if (k == m) break;
} if (j >= start)
{
prev[i] = j;
weight[i] = weight[j] + 1;
} else
{
prev[i] = -1;
weight[i] = 0;
}
}
}
if (n == 0)
{
scan(0,g,FALSE,prev,mincols,maxcols,0,colcount,
NULL,NULL,NULL,numcols,FALSE,m,n); return;
}
for (i = nfixed; i < n; ++i) weight[i] += nfixed;
if (maxcols == NOLIMIT || maxcols > n*numcols) maxcols = n*numcols; if (n*numcols < mincols) return;
staticvoid
colourdigraph(graph *g, int nfixed, long mincols, long maxcols, long *colcount, long *mindeg, long *maxdeg, long *deg, int numcols, int m, int n)
{ static DEFAULTOPTIONS_GRAPH(options);
statsblk stats;
setword workspace[8*MAXNV];
grouprec *group; int i,j,k,nloops;
size_t ii;
set *gi,*gj,*gci,*gcj; int lab[MAXNV],ptn[MAXNV],orbits[MAXNV];
boolean loop[MAXNV]; int prev[MAXNV]; /* If >= 0, earlier point that must have greater colour */ int weight[MAXNV]; int region,start,stop;
DYNALLSTAT(graph,gconv,gconv_sz);
if (n > MAXNV) gt_abort(">E vcolg: MAXNV exceeded\n");
nauty_check(WORDSIZE,m,n,NAUTYVERSIONID);
int
main(int argc, char *argv[])
{
graph *g,*gi; int m,n,codetype; int argnum,i,j,nfixed; char *arg,sw;
boolean badargs,digraph,cswitch,dswitch,Dswitch;
boolean fswitch,uswitch,eswitch,qswitch,mswitch; long mincols,maxcols,totcols; int numcols; double t; char *infilename,*outfilename;
FILE *infile; char msg[201]; int msglen,collen,dlen,Dlen; long colcount[MAXNV],mindeg[MAXNV],maxdeg[MAXNV],deg[MAXNV];
if ((Tswitch!=0) + (oswitch!=0) + (uswitch!=0) >= 2)
gt_abort(">E vcolg: -T, -o and -u are incompatible\n");
#ifndef OUTPROC if (!Tswitch && !oswitch && !uswitch)
gt_abort(">E vcolg: must use -T, -o or -u\n"); #endif
if (!mswitch) numcols = 2;
if (oswitch && numcols != 2)
gt_abort(">E vcolg: -o is only allowed for 2 colours\n");
if (!eswitch)
{
mincols = 0;
maxcols = NOLIMIT;
} if (!fswitch) nfixed = 0;
if (cswitch && mswitch && numcols != collen)
gt_abort(">E vcolg: -m and -c disagree on number of colours\n");
if (cswitch)
{
numcols = collen;
totcols = 0; for (i = 0; i < numcols; ++i) if (colcount[i] < 0)
gt_abort(">E vcolg: negative counts not allowed for -c\n"); else
{
totcols += colcount[i]; if (totcols < 0) { totcols = NOLIMIT; break; } /* catch overflow */
}
} else for (i = 0; i < numcols; ++i) colcount[i] = NOLIMIT;
if (dswitch && dlen > numcols)
gt_abort(">E vcolg: -d has too many colours\n"); if (Dswitch && Dlen > numcols)
gt_abort(">E vcolg: -D has too many colours\n");
for (i = (dswitch ? dlen : 0); i < numcols; ++i)
mindeg[i] = 0; for (i = (Dswitch ? Dlen : 0); i < numcols; ++i)
maxdeg[i] = NOLIMIT; for (i = 0; i < numcols; ++i) if (mindeg[i] > maxdeg[i])
gt_abort(">E vcolg : contradictory bound from -d/-D\n");
if (cswitch && !qswitch)
{
fprintf(stderr,">c"); for (i = 0; i < numcols; ++i)
fprintf(stderr," %ld",colcount[i]);
fprintf(stderr,"\n");
}
if (dswitch && !qswitch)
{
fprintf(stderr,">d"); for (i = 0; i < numcols; ++i)
fprintf(stderr," %ld",mindeg[i]);
fprintf(stderr,"\n");
}
if (Dswitch && !qswitch)
{
fprintf(stderr,">D");
for (i = 0; i < numcols; ++i) if (maxdeg[i] == NOLIMIT) fprintf(stderr," -"); else fprintf(stderr," %ld",maxdeg[i]);
fprintf(stderr,"\n");
}
if (!qswitch)
{
msg[0] = '\0';
CATMSG0(">A vcolg"); if (eswitch || mswitch || uswitch || (fswitch && nfixed > 0)
|| Tswitch || oswitch)
CATMSG0(" -"); if (mswitch) CATMSG1("m%d",numcols); if (uswitch) CATMSG0("u"); if (Tswitch) CATMSG0("T"); if (oswitch) CATMSG0("o"); if (fswitch) CATMSG1("f%d",nfixed); if (eswitch) CATMSG2("e%ld:%ld",mincols,maxcols);
msglen = strlen(msg); if (argnum > 0) msglen += strlen(infilename); if (argnum > 1) msglen += strlen(outfilename); if (msglen >= 196)
{
fputs(msg,stderr); if (argnum > 0) fprintf(stderr," %s",infilename); if (argnum > 1) fprintf(stderr," %s",outfilename);
fprintf(stderr,"\n");
} else
{ if (argnum > 0) CATMSG1(" %s",infilename); if (argnum > 1) CATMSG1(" %s",outfilename);
CATMSG0("\n");
fputs(msg,stderr);
}
fflush(stderr);
}
if (infilename && infilename[0] == '-') infilename = NULL;
infile = opengraphfile(infilename,&codetype,FALSE,1); if (!infile) exit(1); if (!infilename) infilename = "stdin";
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