保持

若有以下定义:  struct node  { int data; struct node *next;  } *p,*q,*t; 指针p、t和q分别指向图中所示结点: p               t               q ↓              ↓              ↓┌──┬──┐ ┌──┬──┐ ┌──┬──┐│data│next┼→│data│next┼→│data│next┼→...└──┴──┘ └──┴──┘ └──┴──┘                    

若有以下定义:  struct node  { int data; struct node *next;  } *p,*q,*t; 指针p、t和q分别指向图中所示结点: p               t               q ↓              ↓              ↓┌──┬──┐ ┌──┬──┐ ┌──┬──┐│data│next┼→│data│next┼→│da