簡答的連結串列實現，增加了求兩個連結串列的並集的功能

Code：

#include <stdio.h>
#include <malloc.h>
#include <string.h>
typedef struct Node
{
   int data;
   struct Node *pNext;
}Node,*PNode;

PNode create_list(void);
void traverse_list(PNode pHead);
PNode insert_list(PNode pHead,int pos,int val);
PNode delete_list(PNode pHead,int pos);
void hebin_list(PNode pHead1,PNode pHead2);
int main()
{
   PNode pHead1=NULL,pHead2=NULL;
   printf("生成第一條連結串列:\n");
   pHead1=create_list();
   insert_list(pHead1,3,4);
   insert_list(pHead1,3,7);
   delete_list(pHead1,7);
   traverse_list(pHead1);
   printf("生成第二條連結串列:\n");
   pHead2=create_list();
   traverse_list(pHead2);
   printf("將兩條連結串列合併:\n");
   hebin_list(pHead1,pHead2);
   traverse_list(pHead2);
   return 0;
}


void hebin_list(PNode pHead1,PNode pHead2){
    PNode p=pHead1->pNext;
    PNode q=pHead2->pNext;
    PNode s;
    while(p->pNext!=NULL){
        while(q->pNext!=NULL){
            if(p->pNext->data==q->pNext->data){
                break;
            }else{
                q=q->pNext;
            }
        }
       if(q->pNext==NULL)
       {
            s=(PNode)malloc(sizeof(Node));
            s->data=p->pNext->data;
            s->pNext=NULL;
            q->pNext=s; //p->next=p->next->next;
       }
        p=p->pNext;
        q=pHead2->pNext;
    }
}

PNode create_list(void)
{
   int len;
   int i;
   int val;
   PNode pHead=(PNode)malloc(sizeof(Node));
   if(NULL==pHead)
   {
      printf("記憶體分配失敗.\n");
      exit(-1);
   }
   PNode p=pHead;
   p->pNext=NULL;
   printf("請輸入您需要生成的結點數:len=");
   scanf("%d",&len);

   for(i=0;i<len;i++)
   {
        printf("請輸入您要儲存第%d的結點值",i+1);
        scanf("%d",&val);

        PNode pNew=(PNode)malloc(sizeof(Node));
        if(NULL==pNew)
        {
            printf("分配失敗，終止!\n");
            exit(-1);
        }

        pNew->data=val;
        p->pNext=pNew;
        pNew->pNext=NULL;
        p=pNew;
   }
   return pHead;
}

void traverse_list(PNode pHead)
{
    PNode p=pHead->pNext;
    while(NULL!=p)
    {
        printf("%d  ",p->data);
        p=p->pNext;
    }
    printf("\n");

    return;
}

PNode insert_list(PNode pHead,int pos,int val)
{
    int i=0;
    PNode p=pHead;
    while(p!=NULL&&i<pos-1)
    {
        p=p->pNext;
        i++;
    }
    if(i>pos-1||p==NULL)
        exit (-1);
    PNode pNew=(PNode)malloc(sizeof(Node));
    if(NULL==pNew)
    {
        printf("動態記憶體分配失敗!\n");
        exit(-1);
    }
    pNew->data=val;
    PNode q=p->pNext;
    p->pNext=pNew;
    pNew->pNext=q;
}

PNode delete_list(PNode pHead,int pos)
{
    int i=0;
    PNode p=pHead;
    while(p->pNext!=NULL&&i<pos-1)
    {
        p=p->pNext;
        i++;
    }
    if(p->pNext==NULL||i>pos-1)
        exit (-1);
    PNode q=p->pNext;
    p->pNext=p->pNext->pNext;
    free(q);
    q=NULL;
    return ;
}