static int
minimal_ladders(ladders_rec_t *rec)
{
Vertex *uu, *vv;
int rc = 0;
char *start = rec->start;
char *goal = rec->goal;
/* build the amplified graph gg */
gg = gb_new_graph(0L);
gg->vertices = __g->vertices;
gg->n = __g->n;
(gg->vertices + gg->n)->name = start;
uu = find_word(start, plant_new_edge);
if (!uu) {
uu = gg->vertices + gg->n++;
}
if (strncmp(start, goal, 5) == 0) {
vv = uu;
} else {
(gg->vertices + gg->n)->name = goal;
vv = find_word(goal, plant_new_edge);
if (!vv) {
vv = gg->vertices + gg->n++;
}
}
if (gg->n == __g->n + 2) {
if (hamm_dist(start, goal) == 1) {
gg->n--;
plant_new_edge(uu);
gg->n++;
}
}
/* print the answer */
if (dijkstra(uu, vv, gg, NULL) < 0) {
strbuf_append_printf(&rec->path,
"Sorry, there's no ladder from %s to %s.",
start, goal);
} else {
rc = dijkstra_result(rec, vv);
}
/* remove all traces of gg */
for (uu = __g->vertices + gg->n-1; uu >= __g->vertices+__g->n; uu--) {
register Arc *a;
for (a = uu->arcs; a; a = a->next) {
vv = a->tip;
vv->arcs = vv->arcs->next;
}
uu->arcs = NULL;
}
gb_recycle(gg);
return rc;
}
//#line 6 "../PROTOTYPES/ladders.ch"
int main(int argc, char *argv[])
//#line 94 "../ladders.w"
{
/*5:*/
//#line 120 "../ladders.w"
while (--argc) {
if (strcmp(argv[argc], "-v") == 0)
verbose = 1;
else if (strcmp(argv[argc], "-a") == 0)
alph = 1;
else if (strcmp(argv[argc], "-f") == 0)
freq = 1;
else if (strcmp(argv[argc], "-h") == 0)
heur = 1;
else if (strcmp(argv[argc], "-e") == 0)
echo = 1;
else if (sscanf(argv[argc], "-n%lu", &n) == 1)
randm = 0;
else if (sscanf(argv[argc], "-r%lu", &n) == 1)
randm = 1;
else if (sscanf(argv[argc], "-s%ld", &seed) == 1);
else {
fprintf(stderr, "Usage: %s [-v][-a][-f][-h][-e][-nN][-rN][-sN]\n", argv[0]);
return -2;
}
}
if (alph || randm)
freq = 0;
if (freq)
heur = 0;
/*:5*/
//#line 95 "../ladders.w"
;
/*6:*/
//#line 149 "../ladders.w"
g = words(n, (randm ? zero_vector : NULL), 0L, seed);
quit_if(g == NULL, panic_code);
/*8:*/
//#line 165 "../ladders.w"
if (verbose) {
if (alph)
printf("(alphabetic distance selected)\n");
if (freq)
printf("(frequency-based distances selected)\n");
if (heur)
printf("(lowerbound heuristic will be used to focus the search)\n");
if (randm)
printf("(random selection of %ld words with seed %ld)\n", g->n, seed);
else
printf("(the graph has %ld words)\n", g->n);
}
/*:8*/
//#line 152 "../ladders.w"
;
/*9:*/
//#line 183 "../ladders.w"
if (alph) {
register Vertex *u;
for (u = g->vertices + g->n - 1; u >= g->vertices; u--) {
register Arc *a;
register char *p = u->name;
for (a = u->arcs; a; a = a->next) {
register char *q = a->tip->name;
a->len = a_dist(a->loc);
}
}
} else if (freq) {
register Vertex *u;
for (u = g->vertices + g->n - 1; u >= g->vertices; u--) {
register Arc *a;
for (a = u->arcs; a; a = a->next)
a->len = freq_cost(a->tip);
}
}
/*:9*/
//#line 153 "../ladders.w"
;
/*10:*/
//#line 202 "../ladders.w"
if (alph || freq || heur) {
init_queue = init_128;
del_min = del_128;
enqueue = enq_128;
requeue = req_128;
}
/*:10*/
//#line 154 "../ladders.w"
;
/*:6*/
//#line 96 "../ladders.w"
;
while (1) {
/*26:*/
//#line 373 "../ladders.w"
putchar('\n');
restart:
if (prompt_for_five("Starting", start) != 0)
break;
if (prompt_for_five(" Goal", goal) != 0)
goto restart;
/*:26*/
//#line 98 "../ladders.w"
;
/*13:*/
//#line 245 "../ladders.w"
/*14:*/
//#line 251 "../ladders.w"
gg = gb_new_graph(0L);
quit_if(gg == NULL, no_room + 5);
gg->vertices = g->vertices;
gg->n = g->n;
/*15:*/
//#line 266 "../ladders.w"
(gg->vertices + gg->n)->name = start;
uu = find_word(start, plant_new_edge);
if (!uu)
uu = gg->vertices + gg->n++;
/*:15*/
//#line 256 "../ladders.w"
;
/*16:*/
//#line 272 "../ladders.w"
if (strncmp(start, goal, 5) == 0)
vv = uu;
else {
(gg->vertices + gg->n)->name = goal;
vv = find_word(goal, plant_new_edge);
if (!vv)
vv = gg->vertices + gg->n++;
}
/*:16*/
//#line 257 "../ladders.w"
;
if (gg->n == g->n + 2) /*19: */
//#line 311 "../ladders.w"
if (hamm_dist(start, goal) == 1) {
gg->n--;
plant_new_edge(uu);
gg->n++;
}
/*:19*/
//#line 258 "../ladders.w"
;
quit_if(gb_trouble_code, no_room + 6);
/*:14*/
//#line 246 "../ladders.w"
;
/*21:*/
//#line 333 "../ladders.w"
if (!heur)
min_dist = dijkstra(uu, vv, gg, NULL);
else if (alph)
min_dist = dijkstra(uu, vv, gg, alph_heur);
else
min_dist = dijkstra(uu, vv, gg, hamm_heur);
/*:21*/
//#line 247 "../ladders.w"
;
/*24:*/
//#line 350 "../ladders.w"
if (min_dist < 0)
printf("Sorry, there's no ladder from %s to %s.\n", start, goal);
else
print_dijkstra_result(vv);
/*:24*/
//#line 248 "../ladders.w"
;
/*25:*/
//#line 360 "../ladders.w"
for (uu = g->vertices + gg->n - 1; uu >= g->vertices + g->n; uu--) {
register Arc *a;
for (a = uu->arcs; a; a = a->next) {
vv = a->tip;
vv->arcs = vv->arcs->next;
}
uu->arcs = NULL;
}
gb_recycle(gg);
/*:25*/
//#line 249 "../ladders.w"
;
/*:13*/
//#line 100 "../ladders.w"
;
}
return 0;
}
