| Time Limit: 500MS | Memory Limit: 10000K | |
| Total Submissions: 71191 | Accepted: 16721 |
本题总的来说并不是很难，但是却很麻烦，我在北大上做题时wrong了n次，最终总算通过了，我不知道大牛们是怎么做的，但是我的做法的确是很麻烦
思想是：就是将输入的自然数a去掉小数点后，然后进行n次大整数相乘，每次的乘数是输入以后去掉小数点的a，被乘数是前面乘过以后的结果。在结束完n次以后将小数点加到合适的位置，并进行前后的除零。
代码：
1
#include
<
stdio.h
>
2
#include
<
string
.h
>
3
int
main()
4
{
5
int
i,j,sum,k,res[
500
][
500
],flag
=
0
,b,dox,mark,deadline,t;
6
char
result[
500
],a[
65
],tran[
500
];
7
while
(scanf(
"
%s
"
,a)
!=
EOF)
8
{
9
sum
=
0
;k
=
0
;dox
=
0
;mark
=
0
;
10
memset(result,
0
,
sizeof
(result));
11
result[
0
]
=
'
1
'
;
12
getchar();
13
scanf(
"
%d
"
,
&
b);
14
int
len1
=
strlen(a);
15
if
(a[
0
]
==
'
0
'
)
16
{
17
for
(i
=
2
;a[i]
!=
'
\0
'
;i
++
)
18
a[i
-
2
]
=
a[i];
19
len1
-=
2
;
20
dox
=
len1;
21
a[len1]
=
'
\0
'
;
22
}
23
else
24
{
25
for
(i
=
0
;a[i]
!=
'
\0
'
;i
++
)
26
{
27
if
(a[i]
==
'
.
'
)
28
{
29
mark
=
1
;
30
len1
--
;
31
continue
;
32
}
33
if
(mark)
34
{
35
a[i
-
1
]
=
a[i];
36
dox
++
;
37
}
38
}
39
a[len1]
=
'
\0
'
;
40
}
41
for
(t
=
1
;t
<=
b;t
++
)
42
{
43
memset(res,
0
,
sizeof
(res));
44
int
len2
=
strlen(result);
45
strcpy(tran,result);
46
for
(i
=
0
;i
<
len2;i
++
)
47
result[i]
=
tran[len2
-
1
-
i];
48
k
=
0
;sum
=
0
;
49
for
(i
=
0
;i
<
len1;i
++
)
50
for
(j
=
0
;j
<
len2;j
++
)
51
res[i][j]
=
(a[i]
-
'
0
'
)
*
(result[j]
-
'
0
'
);
52
for
(i
=
len1
-
1
;i
>=
0
;i
--
)
53
{
54
for
(j
=
len2
-
1
;j
>=
0
;j
--
)
55
sum
=
sum
+
res[i
+
len2
-
j
-
1
][j];
56
result[k]
=
sum
%
10
+
'
0
'
;
57
k
=
k
+
1
;
58
sum
=
sum
/
10
;
59
}
60
for
(i
=
len2
-
2
;i
>=
0
;i
--
)
61
{
62
for
(j
=
0
;j
<=
i;j
++
)
63
sum
=
sum
+
res[i
-
j][j];
64
result[k]
=
sum
%
10
+
'
0
'
;
65
k
=
k
+
1
;
66
sum
=
sum
/
10
;
67
}
68
if
(sum
!=
0
)
69
{
70
result[k]
=
sum
+
'
0
'
;k
=
k
+
1
;
71
}
72
}
73
dox
=
dox
*
b;
74
int
len
=
strlen(result);
75
if
(dox
!=
0
)
76
{
77
if
(dox
<=
len
-
1
)
78
{
79
for
(i
=
len
-
1
;i
>=
dox;i
--
)
80
result[i
+
1
]
=
result[i];
81
result[dox]
=
'
.
'
;
82
len
++
;
83
}
84
else
85
{
86
result[dox]
=
'
.
'
;
87
for
(i
=
dox
-
1
;i
>
len
-
1
;i
--
)
88
result[i]
=
'
0
'
;
89
}
90
}
91
deadline
=
0
;
92
len
=
len
-
1
>
dox
?
len
-
1
:dox;
93
for
(i
=
0
;i
<=
len;i
++
)
94
{
95
if
(result[i]
!=
'
0
'
)
96
{
97
if
(result[i]
==
'
.
'
)
98
deadline
=
i
+
1
;
99
else
100
deadline
=
i;
101
break
;
102
}
103
}
104
mark
=
0
;
105
106
for
(i
=
len;i
>=
deadline;i
--
)
107
if
(mark
==
1
||
result[i]
!=
'
0
'
)
108
{
109
mark
=
1
;
110
printf(
"
%c
"
,result[i]);
111
}
112
printf(
"
\n
"
);
113
}
114
return
0
;
115
}
116
（注意：） 我在之前wrong了几次，主要是少考虑了几种情况，经过某位大牛的指点才能通过，此大牛给出的例子是 ：
4.000 2 结果应该是16 并非16.
10.000 2 结果应该是100 并非是1或者100.
