A、p->next->prev=p->prev;p->prev->next=p->next;free(p);
B、p->next->prev=p->next;p->prev->next=p->next;free(p);
C、p->next->prev=p->next;p->prev->next=p->prev;free(p);
D、p->next->prev=p->prev;p->prev->next=p->prev;free(p);
A、p->next->prev=p->prev;p->prev->next=p->next;free(p);
B、p->next->prev=p->next;p->prev->next=p->next;free(p);
C、p->next->prev=p->next;p->prev->next=p->prev;free(p);
D、p->next->prev=p->prev;p->prev->next=p->prev;free(p);
A.p->right=s; s->left=p; p->right->left=s; s->right=p->right;
B.s->left=p;s->right=p->right;p->right=s; p->right->left=s;
C.p->right=s; p->right->left=s; s->left=p; s->right=p->right;
D.s->left=p;s->right=p->right;p->right->left=s; p->right=s;
A、p->pre=q;q->next=p;p->pre->next=q;q->pre=p->pre;
B、q->pre=p->pre;p->pre->next=q;q->next=p;p->pre=q->next;
C、q->next=p;p->next=q;p->pre->next=q;q->next=p;
D、p->pre->next=q; q->next=p; q->pre=p->pre;p->pre=q;
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