/* delptg.c version 3.3; B D McKay, Jan 2022. */
#define USAGE \
"delptg [-lq] [-a|-b] [-d#|-d#:#] [-v#|-v#:#] [-r#] [-n#] [-m#|-i] [infile [outfile]]"
#define HELPTEXT \
" Delete some vertices from a file of graphs.\n\
\n\
The output file has a header if and only if the input file does.\n\
No isomorph reduction is done.\n\
\n\
-l Canonically label outputs\n\
-d# -d#:# Only remove vertices with original degree in the given range\n\
For digraphs, the out-degree is used.\n\
-n# The number of vertices to delete (default 1).\n\
-v# -v#:# Vertex number or numbers that it is allowed to delete\n\
(first vertex is number 0).\n\
-m# Lower bound on minimum degree of output graphs.\n\
-r# Choose # random sets of points (not necessarily different)\n\
-a The deleted points must be adjacent.\n\
-b The deleted points must be non-adjacent.\n\
-i Leave deleted vertices as isolates, not compatible with -m.\n\
No empty graphs are output. No warning is issued if\n\
-d, -v -n, -m together imply no graphs are output.\n\
For digraphs, out-degree is used for -d and -m.\n\
-q Suppress auxiliary information\n"
/*************************************************************************/
#include "gtools.h"
static FILE *outfile;
static nauty_counter nout;
static int outcode;
static boolean digraph,dolabel;
/**************************************************************************/
static void
writeone(graph *g, int m, int n, int *del, int ndel,
int outmindeg, boolean isolates)
/* Delete the stated vertices and write it is mindeg is high enough.
* The vertices to delete are del[0] < del[1] < ... < del[ndel-1]. */
{
int i,j,k,nx,mx,deg;
graph *gi,*gxi,*gq;
ssize_t ii;
#if MAXN
graph gx[MAXN*MAXM];
graph hx[MAXN*MAXM];
int lab[MAXN];
#else
DYNALLSTAT(graph,gx,gx_sz);
DYNALLSTAT(graph,hx,hx_sz);
DYNALLSTAT(int,lab,lab_sz);
#endif
if (isolates)
{
nx = n;
mx = m;
}
else
{
nx = n - ndel; /* Always positive */
mx = SETWORDSNEEDED(nx);
}
#if !MAXN
DYNALLOC2(graph,gx,gx_sz,mx,nx,"delptg");
if (dolabel) DYNALLOC2(graph,hx,hx_sz,mx,nx,"delptg");
DYNALLOC1(int,lab,lab_sz,nx,"delptg");
#endif
if (isolates)
{
for (ii = mx*(ssize_t)nx; --ii >= 0; )
gx[ii] = g[ii];
for (j = 0; j < ndel; ++j)
{
k = del[j];
EMPTYSET(GRAPHROW(gx,k,mx),mx);
for (i = 0, gxi = gx; i < nx; ++i, gxi += mx)
DELELEMENT(gxi,k);
}
}
else
{
j = 0;
for (i = 0; i < del[0]; ++i) lab[j++] = i;
for (k = 1; k < ndel; ++k)
for (i = del[k-1]+1; i < del[k]; ++i) lab[j++] = i;
for (i = del[ndel-1]+1; i < n; ++i) lab[j++] = i;
EMPTYSET(gx,nx*(size_t)mx);
for (i = 0, gxi = (set*)gx; i < nx; ++i, gxi += mx)
{
gi = GRAPHROW(g,lab[i],m);
for (j = 0; j < nx; ++j)
{
k = lab[j];
if (ISELEMENT(gi,k)) ADDELEMENT(gxi,j);
}
}
}
if (outmindeg > 0)
{
for (i = 0, gxi = (set*)gx; i < nx; ++i, gxi += mx)
{
deg = 0;
for (j = 0; j < mx; ++j) deg += POPCOUNT(gxi[j]);
if (deg < outmindeg) return;
}
}
if (dolabel)
{
fcanonise(gx,mx,nx,hx,NULL,digraph);
gq = hx;
}
else
gq = gx;
if (outcode == DIGRAPH6 || digraph) writed6(outfile,gq,mx,nx);
else if (outcode == SPARSE6) writes6(outfile,gq,mx,nx);
else writeg6(outfile,gq,mx,nx);
++nout;
}
/**************************************************************************/
static void
delrandom(int ndel, int *del, graph *g, int m, int n, int outmindeg,
int *okverts, int nvok, boolean isolates)
/* Delete ndel vertices chosen at random from okverts[0..nvok-1] */
{
int i,k;
for (i = 0; i < nvok; ++i) del[i] = okverts[i];
if (2*ndel < nvok)
{ /* Choose ndel */
k = 0;
do
{
i = KRAN(nvok);
if (del[i] >= 0)
{
del[i] = -1 - del[i];
++k;
}
} while (k < ndel);
k = 0;
for (i = 0; i < nvok; ++i)
if (del[i] < 0) del[k++] = -1 - del[i];
}
else
{ /* Remove nvok-ndel */
k = 0;
do
{
i = KRAN(nvok);
if (del[i] >= 0)
{
del[i] = -1;
++k;
}
} while (k < nvok-ndel);
k = 0;
for (i = 0; i < nvok; ++i)
if (del[i] >= 0) del[k++] = del[i];
}
writeone(g,m,n,del,ndel,outmindeg,isolates);
}
/**************************************************************************/
static void
search(int level, int ndel, int *del, graph *g, int m, int n, int outmindeg,
int *okverts, int lastok, int nvok, boolean isolates)
/* level vertices have been chosen, last one was okverts[lastok] */
{
int i;
if (level == ndel)
{
writeone(g,m,n,del,ndel,outmindeg,isolates);
return;
}
for (i = lastok+1; i <= level + nvok - ndel; ++i)
{
del[level] = okverts[i];
search(level+1,ndel,del,g,m,n,
outmindeg,okverts,i,nvok,isolates);
}
}
/**************************************************************************/
static void
search_a(int level, int ndel, int *del, graph *g, int m, int n, set *avail,
int outmindeg, int *okverts, int lastok, int nvok, boolean isolates)
/* level vertices have been chosen, last one was okverts[lastok] */
{
int i,j,v;
set *gv;
if (level == ndel)
{
writeone(g,m,n,del,ndel,outmindeg,isolates);
return;
}
for (i = lastok+1; i <= level + nvok - ndel; ++i)
{
v = okverts[i];
if (ISELEMENT(avail,v))
{
gv = g + m*(size_t)v;
if (level < ndel-1)
for (j = 0; j < m; ++j) avail[m+j] = avail[j] & gv[j];
del[level] = v;
search_a(level+1,ndel,del,g,m,n,
avail+m,outmindeg,okverts,i,nvok,isolates);
}
}
}
/**************************************************************************/
static void
search_b(int level, int ndel, int *del, graph *g, int m, int n, set *avail,
int outmindeg, int *okverts, int lastok, int nvok, boolean isolates)
/* level vertices have been chosen, last one was okverts[lastok] */
{
int i,j,v;
set *gv;
if (level == ndel)
{
writeone(g,m,n,del,ndel,outmindeg,isolates);
return;
}
for (i = lastok+1; i <= level + nvok - ndel; ++i)
{
v = okverts[i];
if (ISELEMENT(avail,v))
{
gv = g + m*(size_t)v;
if (level < ndel-1)
for (j = 0; j < m; ++j) avail[m+j] = avail[j] & ~gv[j];
del[level] = v;
search_b(level+1,ndel,del,g,m,n,
avail+m,outmindeg,okverts,i,nvok,isolates);
}
}
}
/**************************************************************************/
int
main(int argc, char *argv[])
{
char *infilename,*outfilename;
FILE *infile;
boolean badargs,quiet,dswitch,nswitch,vswitch,mswitch;
boolean adj,nonadj,isolates,delrand;
int i,j,m,n,v,argnum;
int ndel,outmindeg;
int codetype;
graph *g;
nauty_counter nin;
char *arg,sw;
setword *gv;
long mindeg,maxdeg,irand,numrand;
long minv,maxv;
int iminv,imaxv,actmaxv,nvok;
int degv;
double t;
#if MAXN
int okverts[MAXN];
int del[MAXN];
#else
DYNALLSTAT(int,okverts,okverts_sz);
DYNALLSTAT(int,del,del_sz);
#endif
DYNALLSTAT(set,avail,avail_sz);
HELP; PUTVERSION;
infilename = outfilename = NULL;
badargs = vswitch = mswitch = FALSE;
dswitch = nswitch = quiet = FALSE;
adj = nonadj = isolates = delrand = FALSE;
argnum = 0;
badargs = FALSE;
for (j = 1; !badargs && j < argc; ++j)
{
arg = argv[j];
if (arg[0] == '-' && arg[1] != '\0')
{
++arg;
while (*arg != '\0')
{
sw = *arg++;
SWBOOLEAN('l',dolabel)
else SWBOOLEAN('q',quiet)
else SWBOOLEAN('a',adj)
else SWBOOLEAN('b',nonadj)
else SWBOOLEAN('i',isolates)
else SWINT('n',nswitch,ndel,">E delptg -n")
else SWRANGE('d',":-",dswitch,mindeg,maxdeg,">E delptg -d")
else SWRANGE('v',":-",vswitch,minv,maxv,">E delptg -v")
else SWINT('m',mswitch,outmindeg,">E delptg -m")
else SWLONG('r',delrand,numrand,">E delptg -r")
else badargs = TRUE;
}
}
else
{
++argnum;
if (argnum == 1) infilename = arg;
else if (argnum == 2) outfilename = arg;
else badargs = TRUE;
}
}
if (nswitch && ndel < 1) gt_abort(">E delptg: bad argument for -n\n");
if (adj && nonadj) gt_abort(">E delptg: -a and -b are incompatible\n");
if (mswitch && isolates)
gt_abort(">E delptg: -m and -i are incompatible\n");
if (delrand && (adj || nonadj))
gt_abort(">E delptg: -r is incompatible with -a and -b\n");
if (badargs)
{
fprintf(stderr,">E Usage: %s\n",USAGE);
GETHELP;
exit(1);
}
if (!quiet)
{
fprintf(stderr,">A delptg");
if (dolabel||adj||nonadj||isolates)
fprintf(stderr," -%s%s%s%s",(dolabel?"l":""),
(adj?"a":""),(nonadj?"b":""),(isolates?"i":""));
if (dswitch) fprintf(stderr," -d%ld:%ld",mindeg,maxdeg);
if (nswitch) fprintf(stderr," -n%d",ndel);
if (vswitch) fprintf(stderr," -v%ld:%ld",minv,maxv);
if (mswitch) fprintf(stderr," -m%d",outmindeg);
if (delrand) fprintf(stderr," -r%ld",numrand);
if (argnum > 0) fprintf(stderr," %s",infilename);
if (argnum > 1) fprintf(stderr," %s",outfilename);
fprintf(stderr,"\n");
fflush(stderr);
}
if (vswitch)
{
iminv = (minv < 0 ? 0 : (int) minv);
imaxv = (maxv >= NAUTY_INFINITY ? NAUTY_INFINITY-1 : maxv);
}
else
{
iminv = 0;
imaxv = NAUTY_INFINITY-1;
}
if (!mswitch) outmindeg = 0;
if (!dswitch)
{
mindeg = 0;
maxdeg = NAUTY_INFINITY;
}
if (!nswitch) ndel = 1;
if (ndel == 1) adj = nonadj = FALSE;
if (dolabel) nauty_check(WORDSIZE,1,1,NAUTYVERSIONID);
nin = nout = 0;
if (infilename && infilename[0] == '-') infilename = NULL;
infile = opengraphfile(infilename,&codetype,FALSE,1);
if (!infile) exit(1);
if (!infilename) infilename = "stdin";
if (!outfilename || outfilename[0] == '-')
{
outfilename = "stdout";
outfile = stdout;
}
else if ((outfile = fopen(outfilename,"w")) == NULL)
{
fprintf(stderr,"Can't open output file %s\n",outfilename);
gt_abort(NULL);
}
if (codetype&SPARSE6) outcode = SPARSE6;
else if (codetype&DIGRAPH6) outcode = DIGRAPH6;
else outcode = GRAPH6;
if (codetype&HAS_HEADER)
{
if (outcode == SPARSE6) writeline(outfile,SPARSE6_HEADER);
else if (outcode == DIGRAPH6) writeline(outfile,DIGRAPH6_HEADER);
else writeline(outfile,GRAPH6_HEADER);
}
t = CPUTIME;
while (TRUE)
{
if ((g = readgg(infile,NULL,0,&m,&n,&digraph)) == NULL) break;
++nin;
if (n <= ndel)
{
FREES(g);
continue;
}
actmaxv = (imaxv < n ? imaxv : n-1);
if (actmaxv - iminv + 1 < ndel)
{
FREES(g);
continue;
}
#if !MAXN
DYNALLOC1(int,okverts,okverts_sz,n,"delptg");
DYNALLOC1(int,del,del_sz,n,"delptg");
#endif
if (adj || nonadj)
{
DYNALLOC2(set,avail,avail_sz,m,ndel-1,"delptg");
EMPTYSET(avail,m);
}
nvok = 0;
for (v = 0, gv = g; v < n && v <= actmaxv; ++v, gv += m)
{
if (v < iminv) continue;
degv = 0;
for (i = 0; i < m; ++i) degv += POPCOUNT(gv[i]);
if (degv < mindeg || degv > maxdeg) continue;
okverts[nvok++] = v;
}
if (nvok < ndel)
{
FREES(g);
continue;
}
if (adj || nonadj)
{
for (i = 0; i < nvok; ++i)
ADDELEMENT(avail,okverts[i]);
}
if (delrand) INITRANBYTIME;
if (delrand)
{
for (irand = 0; irand < numrand; ++irand)
delrandom(ndel,del,g,m,n,outmindeg,okverts,nvok,isolates);
}
else if (adj)
search_a(0,ndel,del,g,m,n,avail,outmindeg,okverts,-1,nvok,isolates);
else if (nonadj)
search_b(0,ndel,del,g,m,n,avail,outmindeg,okverts,-1,nvok,isolates);
else
search(0,ndel,del,g,m,n,outmindeg,okverts,-1,nvok,isolates);
FREES(g);
}
t = CPUTIME - t;
if (!quiet)
fprintf(stderr,
">Z " COUNTER_FMT " graphs read from %s, "
COUNTER_FMT " written to %s; %3.2f sec.\n",
nin,infilename,nout,outfilename,t);
exit(0);
}
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(vorverarbeitet am 2026-11-04)
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