函式介面定義：
position find( list l, elementtype x );
list insert( list l, elementtype x, position p );
list delete( list l, position p );
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。
裁判測試程式樣例：
#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)
;return0;
}/* 你的**將被嵌在這裡 */
12 2 4 87 10 2
42 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
position find
( list l, elementtype x )
l = l->next;
}return error;
}list insert
( list l, elementtype x, position p )
while
(l)
l= l ->next;
}printf
("wrong position for insertion\n");
return error;
}list delete
( list l, position p )
list head =l;
while
(l) l=l->next;
}printf
("wrong position for deletion\n");
return error;
}
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