#include<stdio.h> #include using namespace std; int a[10005]; /交换两个整数的值/ void swap(int *p, int *q) { int buf;

buf = *p;
*p = *q;
*q = buf;

return;

} /查找一个有序数组中的众数/ int find_mode_number(int *arr,int len) { int many = 1,less = 1; int value = 0; for(int i = 0; i < len; i++) { for(int j = i; j < len; j++) { if(arr[j] == arr[j+1]) { less++; } else { if(many < less) { swap(&many,&less); value = arr[j]; } less = 1; break; } } }

return value;

}

int main() { int n; scanf("%d",&n); //输入数组元素 for(int i=0; i<n; i++) { scanf("%d",&a[i]); } sort(a,a+n); //将数组排序 int sum=0; //先求和后求平均数 for(int i=0; i<n; i++) { sum+=a[i]; //数组求和 } double avg=sum1.0/n1.0;

double mid_num;
if(n%2==0)
{
    mid_num=(a[(n-1)/2]+a[n/2])*1.0/2.0;
}
else

{
    mid_num=a[n/2];
}

int count=find_mode_number(a,sizeof(a)/sizeof(int));//调用求众数函数

printf("%.2lf %d %.1lf\n",avg,count,mid_num);
return 0;

}