p->next=s; s->prior=p; p->next->prior=s; s->next=p->next;
s->prior=p; s->next=p->next; p->next=s; p->next->prior=s;
p->next=s; p->next->prior=s; s->prior=p; s->next=p->next;
s->prior=p; s->next=p->next; p->next->prior=s; p->next=s;
B哪里错啦????
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