合并有序链表（使用原链表空间/创建新链表空间）

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我是靠谱客的博主文静硬币，最近开发中收集的这篇文章主要介绍合并有序链表（使用原链表空间/创建新链表空间），觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

关于合并两有序链表可以通过使用，原有链表空间进行合并，也可以通过创建新链表来进行合并。显然对比而言后者更易理解和实现。

下面将提供两种合并方法的代码。

（一）创建新链表合并。

#include <stdio.h>
#include <malloc.h>
//合并两张非递减有序链表
//以空间换时间多申请一个链表

//结点
typedef struct node
{
    int data;
    struct node *next;
}*Node, node;

//建立动态链表
Node creatlist(){
    int n;
    Node head,p,q;
    head = (Node)malloc(sizeof(node));
    q = head;
    scanf("%d", &n);
    while(n != -1){
        p = (Node)malloc(sizeof(node));
        p->data = n;
        q->next = p;
        q = p;
        scanf("%d",&n);
    }
    q->next = NULL;
    return head;
}
//合并两张非递减有序链表
Node merge(Node head1, Node head2){
    Node p1,p2,p3,q3;
    Node head3;
    head3 = (Node)malloc(sizeof(node));
    q3 = head3;
    p1 = head1->next;
    p2 = head2->next;
    while(p1&&p2){
        p3 = (Node)malloc(sizeof(node));
        if(p1->data <= p2->data){
            p3->data = p1->data;
            q3->next = p3;
            q3 = p3;
            p1 = p1->next;
        }else{
            p3->data = p2->data;
            q3->next = p3;
            q3 = p3;
            p2 = p2->next;
        }
    }
    while (p1)
    {
        p3 = (Node)malloc(sizeof(node));
        p3->data = p1->data;
        q3->next = p3;
        q3 = p3;
        p1 = p1->next;
    }
    while (p2)
    {
        p3 = (Node)malloc(sizeof(node));
        p3->data = p2->data;
        q3->next = p3;
        q3 = p3;
        p2 = p2->next;
    } 
    q3->next = NULL;
    return head3;
}

void output(Node head){
    while(head->next){
        printf("%d ", head->next->data);
        head = head->next;
    }
}

int main(){
    //创建链表(带头结点)
    Node head1, head2, head3;
    head1 = crt_list();
    head2 = crt_list();
    //合并递增链表

    head3 = merge(head1, head2);
    //输出链表
    output(head1);
    printf("n");
    output(head2);
    output(head3);
    return 0;
}

（二）使用原有链表空间合并

#include <stdio.h>
#include <malloc.h>
//合并两张递增有序链表
//使用原空间

//结点
typedef struct node
{
    int data;
    struct node *next;
}*Node, node;
//创建链表
Node creatlist(){
    int n;
    Node head,p,q;
    head = (Node)malloc(sizeof(node));
    q = head;
    scanf("%d", &n);
    while(n != -1){
        p = (Node)malloc(sizeof(node));
        p->data = n;
        q->next = p;
        q = p;
        scanf("%d",&n);
    }
    q->next = NULL;
    return head;
}

//合并链表
Node merge(Node head1, Node head2){
    Node pa = head1;
    Node pb = head2->next;
    Node p;
    while(pa->next&&pb){
        if(pb->data<=pa->next->data){
            p = pb;
            pb = pb->next;
            p->next = pa->next;
            pa->next = p;
            pa = p->next;
        } else{
            pa = pa->next;
        }   
    }
    while (pb)
    {
        p = pb;
        pb = pb->next;
        p->next = pa->next;
        pa->next = p;
        pa = p;
    }
    return head1;
}
//输出链表
void output(Node head){
    while(head->next){
        printf("%d ", head->next->data);
        head = head->next;
    }
}

int main(){
    Node head1;
    Node head2;
    Node head3;
    //创建链表
    head1 = creatlist();
    head2 = creatlist();
    //合并链表
    head3 = merge(head1, head2);
    //输出链表
    output(head3);
}

以上就是两种不同的合并链表方式（欢迎在评论区点评和提问）。