int main() {
char now[101];
strcpy(now, "http://www.acm.org/");
for(;;) {
char s[71];
scanf("%s", s);
if (strcmp(s, "VISIT") == 0) {
scanf("%s", s);
printf("%s\n", s);
b_push(now);
strcpy(now, s);
empty();
} else if (strcmp(s, "BACK") == 0) {
char *url=b_pop();
if (strcmp(url, "Ignored")!=0) {
f_push(now);
strcpy(now, url);
}
printf("%s\n", url);
} else if (strcmp(s, "FORWARD") == 0) {
char *url=f_pop();
if (strcmp(url, "Ignored")!=0) {
b_push(now);
strcpy(now, url);
}
printf("%s\n", url);
} else {
return 0;
}
}
}
int main(void) {
struct stack *balancer = stack_new();
for (int i = 0; i < 10; i++) {
b_push(balancer, node_new((void *)0xbeef), 2);
printf("after push, n stacks in the balancer: %d\n",balancer->n_items);
}
for (int i = 0; i < 10; i++) {
struct node *n = b_pop(balancer);
printf("after pop, n stacks in the balancer: %d, val: %p\n",balancer->n_items, n->value);
}
}
