本題要求實現鏈式表的操作集。
position find( list l, elementtype x );
list insert( list l, elementtype x, position p );
list delete( list l, position p );
list結構定義如下：
typedef struct lnode *ptrtolnode;
struct lnode ;
typedef ptrtolnode position;
typedef ptrtolnode list;
position find( list l, elementtype x )：返回線性表中首次出現x的位置。若找不到則返回error；
list insert( list l, elementtype x, position p )：將x插入在位置p指向的結點之前，返回鍊錶的表頭。如果引數p指向非法位置，則列印「wrong position for insertion」，返回error；
list delete( list l, position p )：將位置p的元素刪除並返回鍊錶的表頭。若引數p指向非法位置，則列印「wrong position for deletion」並返回error。
#include #include #define error null
typedef int elementtype;
typedef struct lnode *ptrtolnode;
struct lnode ;
typedef ptrtolnode position;
typedef ptrtolnode list;
position find( list l, elementtype x );
list insert( list l, elementtype x, position p );
list delete( list l, position p );
int main()
scanf("%d", &n);
while ( n-- )
}l = insert(l, x, null);
if ( l==error ) printf("wrong answer\n");
else
printf("%d is inserted as the last element.\n", x);
p = (position)malloc(sizeof(struct lnode));
tmp = insert(l, x, p);
if ( tmp!=error ) printf("wrong answer\n");
tmp = delete(l, p);
if ( tmp!=error ) printf("wrong answer\n");
for ( p=l; 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
提交**（not mine）
position find(list l,elementtype x)return
error;
}list insert(list l,elementtype x,position p)
while
(l)
if(!l)
l->next = (list)malloc(sizeof(struct
lnode));
l->next->data =x;
l->next->next =p;
return
head;
}list delete(list l,position p)
list head=l;
while
(l)
if(!l)
l->next = p->next;
free
(p);
return
head;
}
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