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Status ListInsert_L(LinkList &L,int i,ElemType e){
// 带头结点的单链表L中第i个位置前插入元素e
p=L,j=0;
while(p&&j<i-1){p=p->next;++j;}
if(!p||j>i-1) return ERROR;
s=(LinkList)malloc(sizeof(LNode));
s->data=e;s->next=p->next;
p->next=s;
return OK;
}//ListInsert_L
Status ListDelete_L(LinkList &L,int i,ElemType &e){
p=L,j=0;
while(p-->next&&j<i-1){p=p->next;++j;}
if(!(p->next)||j>i-1) return ERROR;
q=p->next;p->next=q->next;
e=q->data;free(q);
return OK;
}//ListDelete_L