两个有序链表的合并

Posted 2020-09-07 浪漫逆风

笔记和代码的思路来源：

好大学慕课浙江大学陈越、何钦铭的《数据结构》

 

  1 #include <stdio.h>
  2 #include <stdlib.h>
  3 
  4 typedef int ElementType;
  5 typedef struct Node *PtrToNode;
  6 struct Node {
  7     ElementType Data;
  8     PtrToNode   Next;
  9 };
 10 typedef PtrToNode List;
 11 
 12 List Read(); /* 细节在此不表 */
 13 void Print( List L ); /* 细节在此不表；空链表将输出NULL */
 14 
 15 List Merge( List L1, List L2 );
 16 
 17 
 18 
 19 int main()
 20 {
 21     List L1, L2, L;
 22     L1 = Read();
 23     L2 = Read();
 24 
 25     L = Merge(L1, L2);
 26     Print(L);
 27     Print(L1);
 28     Print(L2);
 29 
 30     return 0;
 31 }
 32 
 33 
 34 
 35 
 36 /* 你的代码将被嵌在这里 */
 37 void Print(PtrToNode list){
 38     PtrToNode p = list->Next;
 39     if(p==NULL){
 40         printf("NULL\n");
 41         return;
 42     }
 43     while(p!=NULL){
 44         printf("%d ",p->Data);
 45         p = p->Next;
 46     }
 47     printf("\n");
 48 }
 49 
 50 List Read(){
 51     int count,i,value;
 52     scanf("%d",&count);
 53     PtrToNode list = (PtrToNode)malloc(sizeof(struct Node));
 54     PtrToNode rear = list;
 55     if(list){
 56         list->Next=NULL;
 57     }
 58     for(i=0;i<count;i++){
 59         PtrToNode newNode = (PtrToNode)malloc(sizeof(struct Node));
 60         scanf("%d",&value);
 61         newNode->Data=value;
 62         newNode->Next = rear->Next;
 63         rear->Next = newNode;
 64         rear=newNode;
 65     }
 66     return list;
 67 }
 68 
 69 
 70 List Merge( List L1, List L2 ){
 71     PtrToNode temp;
 72     PtrToNode list = (PtrToNode)malloc(sizeof(struct Node));
 73     PtrToNode rear = list;
 74     PtrToNode p1=L1->Next,p2=L2->Next;
 75     if(list){
 76         list->Next=NULL;
 77     }
 78     while(p1 && p2){
 79         if(p1->Data<=p2->Data){
 80             temp = p1;
 81             rear->Next = temp;
 82             rear=temp;
 83             p1 = p1->Next;
 84         }else{
 85             temp = p2;
 86             rear->Next = temp;
 87             rear=temp;
 88             p2 = p2->Next;
 89         }
 90     }
 91 
 92     while(p1){
 93         temp = p1;
 94         rear->Next = temp;
 95         rear=temp;
 96         //free(p1);
 97         p1 = p1->Next;
 98     }
 99     while(p2){
100         temp = p2;
101         rear->Next = temp;
102         rear=temp;
103         //free(p2);
104         p2 = p2->Next;
105     }
106     L1->Next=NULL;
107     L2->Next=NULL;
108     //Print(list);
109     return list;
110 
111 }

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