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双链表的每个结点包括两个指针域。其中rlink指向结点的后继,llink指向结点的前驱。 如果要在p所指结点前面插入q所指的新结点,下面操作序列正确的是()。

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p ↑.rlink ↑.1link:=q;p ↑.rlink:=q;q ↑.llink:=p;q ↑.rlink:=p ↑.rlink;  p ↑.llink ↑.rlink:=q;p ↑.llink:=q;q ↑.rlink:=p;q ↑.llink:=p ↑.llink;  q ↑.llink:=p;q ↑.rlink:=p ↑.rlink;p ↑.rlink ↑.llink:=q;p ↑.rlink:=q;  q ↑.rlink:=p;q ↑.llink:=p ↑.llink;p ↑.llink ↑.rlink:=q;p ↑.llink:=q;  
p↑.rlink ↑.llink:=q;p ↑.rlink:=q;q ↑.llink:=p;q↑.rlink:=p ↑.rlink;  p↑.llink ↑.rlink:=q;p↑.llink:=q;q↑.rlink:=p;q↑.llink:=p ↑.llink;  q↑.llink:=P;q ↑.rlink:=p↑.rlink;p↑.rlinkl:=q;p↑.rlink:=q;  q↑.rlink:=p;q ↑.llink:=p ↑.llink;p ↑.llinkl:=q;p ↑.llink:=q;  
p↑.rlink↑.llink:=q;p↑.rlink:=q;q↑.llink:=p;q↑.rlink:=p↑.rlink;  p↑.llink↑.rlink:=q;p↑.1link:=q;q↑.rlink:=p;q↑.llink:=p↑.llink;  q↑.llink:=p;q↑.rlink:=p↑.rlink;p↑.rlink↑.llink:=q;p↑.rlink:=q;  q↑.rlind:=p;q↑.llink:=p↑.llink;p↑.llink↑.rlink:=q;p↑.llink:=q;  
p↑.flink↑.llink:=q;p↑.rlink:=q;q↑.llink:=p;q↑.rlink:=p↑.flink;  p↑.llink↑.flink:=q;p↑.llink:=q;q↑.flink:=p;q↑.llink:=p↑.llink;  q↑.llink:=p;q↑.flink:=p↑.fiink;p↑.rlink↑.llink:=q;p↑.flink:=q↑;  q↑.rlink:=p;q↑.llink:=p↑.llink;P↑.llink↑.rlink:=q;p↑.llink:=q;  
p↑.rlink↑.llink:=q;p↑.rlink:=q;q↑.llink:=p;q↑.rlink:=p↑.rlink;  p↑.llink↑.rlink:=q;p↑.llink:=q;q↑.rlink:=p;q↑.llink:=p↑.llink;  q↑.llink:=p;q↑.fiink:=p↑.rlink;p↑.rlinkllink:--q;p↑.dink:=q;  q↑.dink:=p;q↑.llink:=p↑.llink;p↑.llink↑.rlink:=q;p↑.llink:=q;  
p↑.rlinkt↑llink:=q;p↑.rlink:=q;q↑.llink:=p;q↑.rlink:=p↑.rlink;  p↑.llinkl↑.rlink:=q;p↑. llink:=q;q↑.rlink:=p;q↑.llink:=p↑.llink;  q↑.llink:=p;q↑.rlink:=p↑.rlink;p↑.rlinkl.llink:=q;p↑.rlink:=q↑;  q↑.rlink:=p;q↑.llink:=p↑.llink;p↑.llink↑.rlink:=q;p↑,llink:=q;  
p↑.rlink↑.llink:=q; p↑.rlink:=q; q↑.llink:=p; q↑.rlink:=p↑.rlink;  p↑.llink↑.rlink:=q; p↑.llink:=q; q↑.rlink:=p; q↑.llink:=p↑.llink;  q↑.llink:=p; q↑.rlink:=p↑.rlink; p↑.rlink↑.llink:=q;p↑.rlink:=q↑;  q↑.rlink:=p; q↑.llink:=p↑.llink; p↑.llink↑.rlink:=q;p↑.llink:=q;  
p↑.rlinkt↑llink:=q;p↑.rlink:=q;q↑.llink:=p;q↑.rlink:=p↑.rlink;  p↑.llinkl↑.rlink:=q;p↑. llink:=q;q↑.rlink:=p;q↑.llink:=p↑.llink;  q↑.llink:=p;q↑.rlink:=p↑.rlink;p↑.rlinkllink:=q;p↑.rlink:=q↑;  q↑.rlink:=p;q↑.llink:=p↑.llink;p↑.llink↑.rlink:=q;p↑,llink:=q;  
p↑.rlink↑.llink:=q; P↑.rlink:=q;q↑.llink:=p; q↑.rlink:=p↑.rlink;  p↑.llink↑.rlink:=q; p↑.l1ink:=q;q↑.rlink:=p;q↑.llink:=p↑.llink;  q↑.llink:=p;q↑.rlink:=p↑.rlink;p↑.rlink↑.llink:=q;p↑.rlink:=q;  q↑.rlink:=p;q↑.llink:=p↑.llink;p↑.llink↑.rlink:=q;p↑.llink:=q;  
p ↑.rlink↑.llink:=q;p↑.rlink:=q;q↑.llink:=p;q↑.rlink:=p↑.rlink;  p ↑.1link↑.rlink:=q;p↑.llink:=q;q↑.rlink:=p;q↑.llink:=p↑.llink;  q↑.llink:=p;q↑,rlink:=p↑.rlink;p↑.rlink↑.llink:=q;p↑.rlink:=q↑;  q↑.rlink:=p;q↑.1link:=p↑.1link;p↑.1link↑.rlink:=q;p↑.llink:=q;  
p↑.rlink↑.llink:=q; p↑.rlink:=q; q↑.llink:=p; q↑.rlink:= p↑.rlink;  p↑.llink↑.rlink:=q; p↑.llink:=q; q↑.rlink:=p; q↑.llink:= p↑.llink;  q↑.llink:= p; q↑.rlink:= p↑.rlink; p↑.rlink↑.llink:=q; p↑.rlink:=q;  q↑.rlink:=p; q↑.llink:= p↑.llink; p↑.llink↑.rlink:=q; p↑.llink:=q;  
p↑.flink↑.llink:=q;p↑.rlink:=q;q↑.llink:=p;q↑.rlink:=p↑.flink;  p↑.llink↑.flink:=q;p↑.llink:=q;q↑.flink:=p;q↑.llink:=p↑.llink;  q↑.llink:=p;q↑.flink:=p↑.fiink;p↑.rlink↑.llink:=q;p↑.flink:=q↑;  q↑.rlink:=p;q↑.llink:=p↑.llink;P↑.llink↑.rlink:=q;p↑.llink:=q;  
p↑.rlink↑.llink:=q;p↑.rlink:=q;q↑.llink:=p;q↑.rlink:=p↑.rlink;  p↑.llink↑.rlink:=q;p↑.llink:=q;q↑.rlink:=p;q↑.llink:=p↑.llink;  q↑.llink:=p;q↑.fiink:=p↑.rlink;p↑.rlinkl.llink:--q;p↑.dink:=q;  q↑.dink:=p;q↑.llink:=p↑.llink;p↑.llink↑.rlink:=q;p↑.llink:=q;  
p ↑.rlink↑.llink:=q;p↑.rlink:=q;q↑.llink:=p;q↑.rlink:=p↑.rlink;  p ↑.1link↑.rlink:=q;p↑.llink:=q;q↑.rlink:=p;q↑.llink:=p↑.llink;  q↑.llink:=p;q↑,rlink:=p↑.rlink;p↑.rlink↑.llink:=q;p↑.rlink:=q↑;  q↑.rlink:=p;q↑.1link:=p↑.1link;p↑.1link↑.rlink:=q;p↑.llink:=q;  
p↑.rlink↑.ll I nk:=q;p↑.rlink:=q;q↑.llink:=p;q↑.rlink:=p↑.rlink;  p↑.llink↑.rl I nk:=q;p↑.llink:=q;q↑.rlink:=p;q↑.llink:=p↑.llink;  q↑.llink:=p;q↑.rlink:=p↑.rlink;p↑.rlink ↑.llink:=q;p↑.rlink:=q;  q↑.rlink:=p;q↑.llink:=P↑,llink;p↑.llink↑.rlink:=q;p↑.llink:=q;  
p↑.rlink↑.llink:=q;p↑.rlink:=q;q↑.llink:=p;q↑.rlink:=p↑.rlink;  p↑.llink↑.rlink:=q;p↑.llink:=q;q↑.rlink:=p;q↑.llink:=p↑.llink;  q↑.llink:=p;q↑.rlink:=p↑.rlink;p↑.rlink ↑.llink:=q;p↑.rlink:=q;  q↑.rlink:=p;q↑.llink:=p↑.llink;p↑.llink ↑.rlink:=q;p↑.llink:=q;  
q↑.rlink:=p;q↑.llink:=p↑.llink;p↑.rlink↑.rlink:=q;p↑.llink:=q;  q↑.llink:=p;q↑.rlink:=p↑.rlink;p↑.rlink↑.llink:=q;p↑.rlink:=q;  p↑.llink↑.rlink:=q;p↑.llink:=q;q↑rlink:=p;q↑.llink:=p↑.llink;  p↑.rlink↑.llink:=q;p↑.rlink:=q;q↑llink:=p;q↑.rlink:=p↑.rihk;  
p↑.rlinkt↑llink:=q;p↑.rlink:=q;q↑.llink:=p:q↑.rlink:=p↑.rlink;  p↑.llinkt↑rlink:=q;p↑.llink:=q:q↑.rlink:=p;q↑.llink:=p↑.llink;  q↑.llink:=p;q↑.rlink:=p↑.rlink;p↑.rlink↑.llink:=q;p↑.rlink:=q;  q↑.rlink:=p;q↑.llink:=p↑.llink;p↑.llink↑.rlink:=q:p↑.llink:=q;  
p↑.rlink↑.llink:=q; p↑.rlink:=q; q↑.llink:=p; q↑.rlink:= p↑.rlink;  p↑.llink↑.rlink:=q; p↑.llink:=q; q↑.rlink:=p; q↑.llink:= p↑.llink;  q↑.llink:= p; q↑.rlink:= p↑.rlink; p↑.rlink↑.llink:=q; p↑.rlink:=q;  q↑.rlink:=p; q↑.llink:= p↑.llink; p↑.llink↑.rlink:=q; p↑.llink:=q;  
p↑.rlink↑.1link:=q;p↑.rlink:=q;q↑.llink:=p;q↑.rlink:=p↑.rlink;  p↑.llink↑.rlink:=q;p↑.llink:=q;q↑.rlink:=p;q↑.llink:=p↑.llink;  q↑.llink:=p;q↑.llink:=p↑.rlink;p↑.rlink↑.llink:=q;p↑.rlink:=q;  q↑.rlink:=p;q↑.llink:=p↑.llink;p↑.llink↑.rlink:=q;p↑.llink:=q;  

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