本題要求實現帶頭結點的鏈式表操作集。
函式介面定義:
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結構定義如下:
typedef
struct lnode *ptrtolnode;
struct lnode ;
typedef ptrtolnode position;
typedef ptrtolnode list;
各個操作函式的定義為:
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。
裁判測試程式樣例:
#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);
return0;}
/* 你的**將被嵌在這裡 */
輸入樣例:
6 12 2 4 87 10 2
4 2 12 87 5
輸出樣例:
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
list makeempty()
position find( list l, elementtype x )
return l;
}bool insert( list l, elementtype x, position p )
if (l->next!=p)
l->next=(list)malloc(sizeof(struct lnode));
l->next->
data
=x; l->next->next=p;
return
true;
}bool delete( list l, position p )
while (l->next)
if (l->next!=p)
l->next=p->next;
return
true;
}
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