UVA　10370 - Above Average

Problem D: Above Average

It is said that 90% of frosh expect to be above average in their class. You are to provide a reality check.
The first line of standard input contains an integer C, the number of test cases. C data sets follow. Each data set begins with an integer, N, the number of people in the class (1 <= N <= 1000). N integers follow,
separated by spaces or newlines, each giving the final grade (an integer between 0 and 100) of a student in the class. For each case you are to output a line giving the percentage of students whose grade is above average, rounded to 3 decimal places.

Sample Input

5
5 50 50 70 80 100
7 100 95 90 80 70 60 50
3 70 90 80
3 70 90 81
9 100 99 98 97 96 95 94 93 91

Output for Sample Input

40.000%
57.143%
33.333%
66.667%
55.556%

再秒一题

#include<cstdio>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<algorithm>
#include<cmath>
#include <cstring>
#include <queue>
using namespace std;
#define eps 1e-20
#define MAXN 1050
#define outstars cout << "*********" << endl;
double a[MAXN];
int main()
{
int T;
cin >> T;
for(int Case = 1 ; Case <= T ; Case ++)
{
double ave , p;
int n;
scanf("%d",&n);
double sum = 0.0;
for(int i = 0 ; i < n ; i++)
{
scanf("%lf",&a[i]);
sum += a[i];
}
ave = sum / n;
int num = 0;
for(int i = 0 ; i < n ; i++)
{
if(a[i] > ave)num++;
}
printf("%.3lf%%\n",(double)100.0 * num / n);
}
return 0;
}
/*

*/