6-6 带头结点的链式表操作集

本题要求实现带头结点的链式表操作集。

函数接口定义:

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List MakeEmpty();
Position Find( List L, ElementType X );
bool Insert( List L, ElementType X, Position P );
bool Delete( List L, Position P );

 其中List结构定义如下:

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typedef struct LNode *PtrToLNode;
struct LNode {
    ElementType Data;
    PtrToLNode Next;
};
typedef PtrToLNode Position;
typedef PtrToLNode List;

 

各个操作函数的定义为:

List MakeEmpty():创建并返回一个空的线性表;

Position Find( List L, ElementType X ):返回线性表中X的位置。若找不到则返回ERROR;

bool Insert( List L, ElementType X, Position P ):将X插入在位置P指向的结点之前,返回true。如果参数P指向非法位置,则打印“Wrong Position for Insertion”,返回false;

bool Delete( List L, Position P ):将位置P的元素删除并返回true。若参数P指向非法位置,则打印“Wrong Position for Deletion”并返回false。

 

裁判测试程序样例:

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#include <stdio.h>
#include <stdlib.h>
 
#define ERROR NULL
typedef enum {false, true} bool;
typedef int ElementType;
typedef struct LNode *PtrToLNode;
struct LNode {
    ElementType Data;
    PtrToLNode Next;
};
typedef PtrToLNode Position;
typedef PtrToLNode List;
 
List MakeEmpty();
Position Find( List L, ElementType X );
bool Insert( List L, ElementType X, Position P );
bool Delete( List L, Position P );
 
int main()
{
    List L;
    ElementType X;
    Position P;
    int N;
    bool flag;
 
    L = MakeEmpty();
    scanf("%d", &N);
    while ( N-- ) {
        scanf("%d", &X);
        flag = Insert(L, X, L->Next);
        if ( flag==false ) printf("Wrong Answer\n");
    }
    scanf("%d", &N);
    while ( N-- ) {
        scanf("%d", &X);
        P = Find(L, X);
        if ( P == ERROR )
            printf("Finding Error: %d is not in.\n", X);
        else {
            flag = Delete(L, P);
            printf("%d is found and deleted.\n", X);
            if ( flag==false )
                printf("Wrong Answer.\n");
        }
    }
    flag = Insert(L, X, NULL);
    if ( flag==false ) printf("Wrong Answer\n");
    else
        printf("%d is inserted as the last element.\n", X);
    P = (Position)malloc(sizeof(struct LNode));
    flag = Insert(L, X, P);
    if ( flag==true ) printf("Wrong Answer\n");
    flag = Delete(L, P);
    if ( flag==true ) printf("Wrong Answer\n");
    for ( P=L->Next; P; P = P->Next ) printf("%d ", P->Data);
    return 0;
}
/* 你的代码将被嵌在这里 */

 

输入样例:

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12 2 4 87 10 2
4
2 12 87 5

 

输出样例:

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2 is found and deleted.
12 is found and deleted.
87 is found and deleted.
Finding Error: 5 is not in.
5 is inserted as the last element.
Wrong Position for Insertion
Wrong Position for Deletion
10 4 2 5

 

代码:

复制代码
Position Find( List L, ElementType X ){
    while(L!=NULL){
        if(L->Data==X){
            return L;
        }else{
            L=L->Next;
        }
        
    }
    return ERROR;
}
bool Insert( List L, ElementType X, Position P ){
    
    
    while(L!=NULL){
        if(L->Next==P){
            Position p = (Position)malloc(sizeof(struct LNode));
            p->Next=L->Next;
            p->Data=X;
            L->Next=p;
            return true;
        }else{
            L=L->Next;
        }
    }
    printf("Wrong Position for Insertion\n");
    return false;
    
    
}
bool Delete( List L, Position P ){
    
    
    while(L!=NULL){
        if(L->Next==P){
            L->Next=P->Next;
            return true;
        }else{
            L=L->Next;
        }
    }
    printf("Wrong Position for Deletion\n");
    

    return false;
    
    
}




List MakeEmpty(){
    List L=(List)malloc(sizeof(struct LNode));
    L->Next=NULL;
    return L;
}
复制代码

 

注意:

List L 作为函数的参数传递时,实际上传递的是指向LNode地址的指针,因此在函数中可以对指针所指向的内容作出修改,但无法对指针本身作出修改。若想对指针进行修改,传参时就得使用指针的引用。

与6-5比较,观察带有头结点的链式表的不同之处。

posted @   Yohoc  阅读(144)  评论(0编辑  收藏  举报
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