p->llink = q; q->rlink = p; p->llink->rlink = q;q->llink = p->llink;
q->llink = p->llink; p->llink->rlink = q; q->rlink = p;p->llink = q->rlink;
q->rlink = p; p->rlink = q;p->llink->rlink = q; q->rlink = p;
p->llink->rlink = q; q->rlink = p;q->llink = p->llink; p->llink = q;
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