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" ); } |
运行结果
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原文链接:http://blog.csdn.net/johnwcheung/article/details/50815932