向一个栈顶指针为hs的链栈中插入一个s结点时,应执行______。 hs->next=s; s->next=hs; hs=s; s->next=hs->next;hs->next=s; s->next=hs; hs=hs->next;
hs->next=s;
s->next=hs; hs=s;
s->next=hs->next;hs->next=s;
s->next=hs; hs=hs->next;