#include<stdio.h>
#include<stdlib.h>
int count=0;
typedef struct node{
	int value;
	struct node *next;
}*Node;
//尾插
void insert(int value,Node head){
	Node p=head;
	while(p->next){
		p=p->next;
	}
	Node temp=(Node)malloc(sizeof(struct node));
	temp->value=value;
	temp->next=p->next;
	p->next=temp;
} 
//打印
void print(Node head){
	Node p=head->next;
	while(p){
		printf("%d ",p->value);
		p=p->next;
	}
} 

//反转递归
Node reverse2(Node head){
	if(head==NULL||head->next==NULL){
		return head;
	}else{
		Node newhead=reverse2(head->next);
		head->next->next=head;
		head->next=NULL;
		return newhead;
	}
	
	
} 
//反转 非递归 尾插法
void reverse3(Node head){
	if(head==NULL||head->next==NULL){
		printf("链表为空");
	}else{
		Node p=head->next;
		Node q=p;
		while(p){
			Node temp=p->next;
			p->next=head->next;
			head->next=p;
			p=temp;
		}
		q->next=NULL;
	}
	
} 
//反转 非递归
void reverse(Node head){
	if(head!=NULL&&head->next!=NULL){
		Node p=head->next,q=p->next,temp;
		if(q==NULL){
			return;
		}
		p->next=NULL;
		while(q->next){
			temp=q->next;
			q->next=p;
			p=q;
			q=temp;
		}
		q->next=p;
		head->next=q;
	}else{
		printf("链表为空");
	}
	
} 
int main(){
	Node head=(Node)malloc(sizeof(struct node));
	head->next=NULL;
	for(int i=0;i<20;i++){
		insert(i,head);
	}
	
	//head->next=reverse2(head->next);
//	reverse3(head);
	reverse(head);
	print(head);

}