#include
#include
using namespace std;
typedef int elemtype;
typedef struct node
nodetype;
nodetype *create()
return head;
}void dis(nodetype *head)
while(p!=head)
cout<
int len(nodetype *head)
int i=0;
while(p!=head)
return i;}
nodetype *ins(nodetype *head,int i,elemtype x)
nodetype *p,*q,*s;
q=(nodetype *)malloc(sizeof(nodetype));
q->data=x;
p=head->next;
s=head;
for(j=1;j
q->next=p;
q->left=s;
s->next=q;
p->left=q;
return head;}
nodetype *del(nodetype *head,int i)
if(j==1)
nodetype *p,*s,*q;
p=head->next;
s=head;
for(j=1;j
q=p->next;
s->next=q;
q->left=s;
return head;
}
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