C语言中数据结构之链表归并排序实例代码
问题
设有两个无头结点的单链表,头指针分别为ha,hb,链中有数据域data,链域next,两链表的数据都按递增排序存放,现要求将hb表归到ha表中,且归并后ha仍递增序,归并中ha表中已有的数据若hb中也有,则hb中的数据不归并到ha中,hb的链表在算法中不允许破坏。
源程序
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#include <stdio.h>
#include<stdlib.h>
#define N1 6 /*链表La的长度*/
#define N2 6 /*链表Lb的长度*/
struct listnode
{
int data;
struct listnode *next;
};
void createlist( struct listnode * *, int );
void listinsert( struct listnode * *, struct listnode * *);
void readlist( struct listnode *);
int main()
{
struct listnode *ha=NULL,*hb=NULL;
printf ( "请按照升序序列输入以下数字以建立链表La\n" );
printf ( "Please Input %d numbers:" ,N1);
createlist(&ha,N1);
printf ( "请按照升序序列输入以下数字以建立链表Lb\n" );
printf ( "Please Input %d numbers:" ,N2);
createlist(&hb,N2);
listinsert(&ha,&hb);
readlist(ha);
printf ( "\n" );
}
void createlist( struct listnode * *p, int n)
{ /*尾插法建立链表*/
struct listnode *t,*q;
int i;
t=( struct listnode *) malloc ( sizeof ( struct listnode));
scanf ( "%d" ,&t->data);
*p=t;
q=t;
for (i=n-1;i>0;i--)
{
t=( struct listnode *) malloc ( sizeof ( struct listnode));
scanf ( "%d" ,&t->data);
q->next=t;
q=t;
}
q->next=NULL;
}
void listinsert( struct listnode * *a, struct listnode * *b)
{ /*将两个链表按递增序列排序*/
struct listnode *pa,*pb,*other,*la,*pre;
la=( struct listnode *) malloc ( sizeof ( struct listnode));
la->next=*a;
pa=*a;
pb=*b;
pre=la;
while (pa&&pb)
{
if (pa->data<pb->data)
{
pre=pre->next;
pa=pa->next;
}
else if (pa->data>pb->data)
{
other=( struct listnode *) malloc ( sizeof ( struct listnode));
other->data=pb->data;
other->next=pa;
pre->next=other;
pre=other;
pb=pb->next;
}
else
{
pre=pre->next;
pa=pa->next;
pb=pb->next;
}
}
if (!pa)
{
while (pb)
{
other=( struct listnode *) malloc ( sizeof ( struct listnode));
other->data=pb->data;
pre->next=other;
pre=pre->next;
pb=pb->next;
}
pre->next=NULL;
}
*a=la->next;
free (la);
}
void readlist( struct listnode *p)
{ /*遍历链表并输出最终结果*/
struct listnode *q;
q=p;
printf ( "链表的排序结果为:\n" );
while (q!=NULL)
{
printf ( "%3d" ,q->data);
q=q->next;
}
printf ( "\n" );
}
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运行结果
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原文链接:http://blog.csdn.net/johnwcheung/article/details/50815932