#include?
<
stdio.h
>
#include?
<
string
.h
>
#define
?N?110
char
?str[
10
];
char
?queue[N][
100
];
int
??top
=
?
0
;
int
??len
=
?
1
;
int
?main()
{
????strcpy(?queue[
++
top],?
"
http://www.acm.org/
"
?);
????
????
while
(?scanf(
"
%s
"
,?str),?strcmp(?str,?
"
QUIT
"
)
!=
?
0
?)
????
{
????????
if
(?strcmp(?str,?
"
VISIT
"
)
==
?
0
?)
????????
{
????????????scanf(
"
%s
"
,?queue[
++
top]?);
????????????printf(
"
%s\n
"
,?queue[top]?);
????????????
????????????len
=
?top;
????????}
????????
else
?
if
(?strcmp(?str,?
"
BACK
"
?)
==
?
0
?)
????????
{
????????????top
--
;
????????????
if
(?top
<
?
1
?)
????????????
{
????????????????printf(
"
Ignored\n
"
);
????????????????top
++
;
????????????}
????????????
else
?printf(
"
%s\n
"
,?queue[top]?);
????????}
????????
else
?
if
(?strcmp(?str,?
"
FORWARD
"
?)
==
?
0
?)
????????
{
????????????top
++
;
????????????
????????????
if
(?top
>
?len?)?
{??printf(
"
Ignored\n
"
);??top
--
;?}
????????????
else
??printf(
"
%s\n
"
,?queue[top]?);
????????}
????}
????
????
return
?
0
;
}
posted on 2008-10-30 13:16
Darren 閱讀(343)
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