水题,推个公式出来,注意精度…一遍A
1
2 /*************************************************************************
3 > File Name: code/2015summer/#5/D.cpp
4 > Author: 111qqz
5 > Email: rkz2013@126.com
6 > Created Time: 2015年07月30日 星期四 13时17分26秒
7 ************************************************************************/
8
9 #include<iostream>
10 #include<iomanip>
11 #include<cstdio>
12 #include<algorithm>
13 #include<cmath>
14 #include<cstring>
15 #include<string>
16 #include<map>
17 #include<set>
18 #include<queue>
19 #include<vector>
20 #include<stack>
21 #define y0 abc111qqz
22 #define y1 hust111qqz
23 #define yn hez111qqz
24 #define j1 cute111qqz
25 #define tm crazy111qqz
26 #define lr dying111qqz
27 using namespace std;
28 #define REP(i, n) for (int i=0;i<int(n);++i)
29 typedef long long LL;
30 typedef unsigned long long ULL;
31 const int inf = 0x7fffffff;
32 int s,m,p;
33 double ans;
34
35 double cal(double x,int n)
36 {
37 double res = 1.0;
38 for ( int i = 1 ; i <= n ; i++ )
39 {
40 res = res * x;
41 }
42 // cout<<"res:"<<res<<endl;
43 return res;
44 }
45 int main()
46 {
47 cin>>s>>m>>p;
48 double sum = 0;
49 double per = p*1.0/100+1;
50 for ( int i = 1 ; i <= m; i++ )
51 {
52 sum=sum+1.0/cal(per,i);
53 // cout<<"sum:"<<sum<<endl;
54 }
55 // cout<<sum<<endl;
56 cout<<fixed<<setprecision(5)<<s*1.0/sum<<endl;
57
58 return 0;
59 }