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 )
;
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。
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 */
6122
487102
421287
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 deletion104
25
list makeempty()
position find
( list l, elementtype x )
l=l-
>next;
}return error;
}bool
insert
( list l, elementtype x, position p )
k=k-
>next;
}printf
("wrong position for insertion\n");
return
false;}
bool
delete
( list l, position p )
while
(l) l=l-
>next;
}printf
("wrong position for deletion\n");
return
false
;}
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