合并两个单链表（链表方式）

假设头指针为La、Lb单链表分别为线性表LA、LB的存储结构，现在要合并La、Lb得到单链表Lc

void MergeList_L(LinkList La, LinkList Lb, LinkList Lc){
    //已知La、Lb的元素按值非递减排列
    //归并La、Lb得到单链表Lc,Lc的元素也是按值非递减排列的
    LinkList pa,pb,pc;
    pa = La->next;
    pb = Lb->next;
    Lc = pc = La;//用La的头结点作为Lc的头结点
    while(pa && pb){
        if(pa->data<=pb->data){
            pc->next = pa;
            pc = pa;
            pa = pa->next;
        }
        else{
            pc->next = pb;
            pc = pb;
            pb = pb->next;
        }
    }
    pc->next = pa?pa:pb;//插入剩余段 
    free(Lb); 
}

 链表合并实例：

#include<stdio.h>
#include<malloc.h>
#include<stdlib.h>
#include<string.h>
#include<iostream>
using namespace std;
#define OVERFLOW -2
typedef struct Node{
    int data;
    struct Node *next;
}Node,*LinkList;

int InitList(LinkList &L){
    L = (LinkList)malloc(sizeof(Node));
    if(!L)
        exit(OVERFLOW);
    L->next = NULL;
    return 1;
}



void CreatList(LinkList &L, int n){
    LinkList p,r;
    r = L;
    int a;
    for(int i = 0; i < n; i++){
        p = (LinkList)malloc(sizeof(Node));
        scanf("%d",&a);
        p->data = a;
        r->next = p;
        r = p;
    }
    r->next = NULL;
}

void PrintList(LinkList &L){//输出单链表 
    LinkList q;
    q = L->next;
    while(q){ 
        printf("%d ",q->data);
        q = q->next;
    }  
}

void Combine(LinkList La, LinkList Lb, LinkList Lc){
    LinkList pa,pb,pc;
    pa = La->next;
    pb = Lb->next;
    Lc = pc = La;
    while(pa && pb){
        if(pa->data <= pb->data){
            pc->next = pa;
            pc = pa;
            pa = pa->next;
        }
        else{
            pc->next = pb;
            pc = pb;
            pb = pb->next;
        }
    }
    pc->next = pa? pa:pb;
    free(Lb);
    PrintList(Lc);
}

int main(){
       int m,n;
    LinkList LA,LB;
    InitList(LA);
    InitList(LB);
    cout<<"请输入创建单链表LA的元素个数：";
    cin>>m;
    CreatList(LA,m);
    cout<<"请输入创建单链表LB的元素个数：";
    cin>>n;
    CreatList(LB,n);
    cout<<endl; 
    cout<<"     链表LA中的元素"<<endl;
    cout<<"-----------------------
";
    PrintList(LA);
    cout<<endl; 
    cout<<"

     链表LB中的元素"<<endl;
    cout<<"-----------------------
";
    PrintList(LB);
    cout<<"

LA、LB合并后的输出结果："<<endl;
    LinkList Lc;
    InitList(Lc);
    Combine(LA,LB,Lc); 
    return 0; 
}

运行结果：