归并线性表[原创]
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#include <stdio.h>
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#include <malloc.h>
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#define NULL 0
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typedef struct lnode{
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char data;
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struct lnode *next;
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}*link,*position;
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typedef struct{
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link head,tail;
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int len;
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}linklist;
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/*=================================*/
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void print(linklist l){ /*---print---在屏幕上输出链表的所有元素*/
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link p=NULL;
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p=l.head;
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if(!p->next){
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printf("\nThe linklist is empty.\n\n");
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return ;
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}
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printf("The list:");
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while(p){
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printf("%c-",p->data);
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p=p->next;
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}
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}
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int compare(char a,char b){ /*---compare---比较两个元素的大小关系*/
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return a-b;
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}
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int length(link s){ /*---length---求链的长度*/
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int i=0;/*i不赋初值,编译错误“可能在i定义以前使用了它在length函数中”*/
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link p=NULL;
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p=s;
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while(p->next!=NULL){
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p=p->next;
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i++;
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}
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return i;
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}
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position makenode(char e){ /*---分配由p指向的结点并赋值为e---*/
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link p=NULL;
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p=(link)malloc(sizeof(struct lnode));
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/*---struct lnode 才能表示一个结构体类型并可用于分配空间的元素类型定义-*/
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if(p){
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p->data=e;
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p->next=NULL;
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}
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else return;
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return p;
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}
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char getcurelem(link p){ /*---返回p所指结点中元素的值-*/
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return p->data;
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}
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int initlist(linklist *l){ /*---构造一个由l指向的空的线性表-*/
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l->head=makenode('L');
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l->head->next=NULL;/*不是l->head=NULL*/
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l->tail=l->head;
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l->len=0;
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return 1;
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}
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int append(linklist *l,link s){ /*---将指针s所的一串结点链接在线性表L的最后一个结点-*/
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link q;
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q=l->head;
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if(!l->tail){/*考虑到链表为空的情况*/
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l->head->next=s;
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while(q->next) q=q->next;/*尾结点的处理*/
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l->tail=q;
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}
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l->tail->next=q=s;
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while(q->next) q=q->next;/*不能忘了对尾结点的处理*/
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l->tail=q;
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l->len+=length(s);
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}
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position delfirst(linklist *l,link q){ /*---删除表中第一个结点并以q返回-*/
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if(!l->head->next){
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printf("\nThe linklist is empty,can not delete..\n");
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return 0;
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}
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q=l->head->next;
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l->head->next=l->head->next->next;
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return q;
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}
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int mergelist_l(linklist *la,linklist *lb,linklist *lc){ /* 算法2.19*/
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char a,b;
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link q=NULL;
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position pa=NULL,pb=NULL;
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pa=la->head->next;
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pb=lb->head->next;
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if(!initlist(lc)) return 0;
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printf("oopop"); print(*la);
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while(pa&&pb){
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a=getcurelem(pa); b=getcurelem(pb);
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if(compare(a,b)<=0){
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q=delfirst(la,q);
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append(lc,q);
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pa=la->head->next;
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}
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else{
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q=delfirst(lb,q);
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append(lc,q);
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pb=lb->head->next;
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}
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}
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if(pa) append(lc,pa);
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else append(lc,pb);
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return 1;
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}
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/*============主函数部分=========*/
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main(){
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int i=0;
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char temp;
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link s,n;
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linklist *l,*la=NULL,*lb,*lc=NULL;
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initlist(la);initlist(lb);initlist(lc);
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temp='A';
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la->head=s=makenode('X');
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for(i=1;i<=10;i++,temp+=2){
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s->next=makenode(temp);
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s=s->next;
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}/*构造以(*la).head为头结点的链表*/
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printf("\nla="); print(*la);
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temp='B';
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lb->head=n=makenode('X');
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for(i=1;i<=10;i++,temp+=2){
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n->next=makenode(temp);
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n=n->next;
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}/*构造以(*lb).head为头结点的链表*/
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printf("\nlb="); print(*lb);
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mergelist_l(la,lb,lc);
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/*归并la、lb指向的线性链表为lc*/
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printf("\nThe mergelisted link lc,"); print(*lc);
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getch();
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}
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