hdu 5003 模拟水题 （2014鞍山网赛G题）

 1 # include <iostream>
 2 # include <cstdio>
 3 # include <algorithm>
 4 # include <map>
 5 # include <cmath>
 6 # define LL long long
 7 using namespace std ;
 8 
 9 int a[110] ;
10 
11 bool cmp (int x , int y)
12 {
13     return x > y ;
14 }
15 
16 int main ()
17 {
18     int T ;
19     scanf("%d" , &T) ;
20     while(T--)
21     {
22         int n ;
23         scanf("%d" , &n) ;
24         int i ;
25         for (i = 1 ; i<=n ;i++)
26             scanf("%d" , &a[i]) ;
27         sort(a+1,a+1+n,cmp) ;
28         double sum = 0 ;
29         for (i = 1 ; i<=n ;i++)
30         {
31             sum+=(pow(0.95,i-1)*a[i]) ;
32         }
33         printf("%.10lf
" , sum) ;
34     }
35 
36     return 0 ;
37 }