本題要求實現帶頭結點的鏈式表操作集。
list makeempty();
position find( list l, elementtype x );
bool insert( list l, elementtype x, position p );
bool delete( list l, position p );
list結構定義如下：
typedef struct lnode *ptrtolnode;
struct lnode ;
typedef ptrtolnode position;
typedef ptrtolnode list;
list makeempty()：建立並返回乙個空的線性表；
position find( list l, elementtype x )：返回線性表中x的位置。若找不到則返回error；
bool insert( list l, elementtype x, position p )：將x插入在位置p指向的結點之前，返回true。如果引數p指向非法位置，則列印「wrong position for insertion」，返回false；
bool delete( list l, position p )：將位置p的元素刪除並返回true。若引數p指向非法位置，則列印「wrong position for deletion」並返回false。
#include #include #define error null
typedef enum bool;
typedef int elementtype;
typedef struct lnode *ptrtolnode;
struct lnode ;
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()
scanf("%d", &n);
while ( 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**將被嵌在這裡 */
6
12 2 4 87 10 2
42 12 87 5
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
本題的鍊錶是帶頭節點的，因此不需要對表頭做單獨處理，對於所有節點，插入和刪除操作統一處理；
list makeempty()
position find( list l, elementtype x )
return error;
}bool insert( list l, elementtype x, position p )
position node = (position)malloc(sizeof(struct lnode));
node->data = x;
node->next = p;
pre->next = node;
return true;
}bool delete( list l, position p )
pre->next = p->next;
return true;
}
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