链表的基本操作

#include<iostream>
#include<cstdio>
#include<cstring>
#include<cmath>
#include<algorithm>
#define mem(x,y) memset(x,y,sizeof(x))
using namespace std;
typedef long long LL;
struct Node{
	int date;
	struct Node *next;
};
Node *Creatlist(Node *head,int n){
	head->next=NULL;
	for(int i=0;i<n;i++){
		Node *p;
		p=(Node*)malloc(sizeof(Node));
		scanf("%d",&p->date);
		p->next=head->next;
		head->next=p;
	}
	return head;
}
Node *Insertlist(Node *head,int pos,int val){
	Node *p,*q;
	p=head;
	for(int i=1;i<pos;i++){
		p=p->next;
	}
	q=(Node *)malloc(sizeof(Node));
	q->date=val;
	q->next=p->next;
	p->next=q;
	return head;
}
Node *Dellist(Node *head,int pos){
	Node *p,*pl;
	p=head;
	for(int i=1;i<pos;i++)p=p->next;
	pl=p->next;
	p->next=pl->next;
	free(pl);
	return head;
}
void Display(Node *head){
	Node *p;
	p=head->next;
	while(p!=NULL){
		printf("%d ",p->date);
		p=p->next;
	}
	puts("");
}
int main(){
	int n;
	Node *head;
	while(~scanf("%d",&n)){
		head=(Node*)malloc(sizeof(head));
		head->next=NULL;
		head=Creatlist(head,n);
		Display(head);
		int pos,val;
		puts("添加元素");
		scanf("%d%d",&pos,&val);
		head=Insertlist(head,pos,val);
		Display(head);
		puts("删除元素");
		scanf("%d",&pos);
		head=Dellist(head,pos);
		Display(head);
	}
	return 0;
}