题解

#include<iostream>
#include<cstdio>
using namespace std;
int main(){
    double n,a[20],sum=0;
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>a[i];
        sum+=a[i];
    }
    printf("AV=%.1f\n",sum/n);
    double x=sum/n;
    for(int i=1;i<=n;i++){
        if(a[i]>x){
            cout<<i<<':'<<a[i]<<' ';
        }
    }
    return 0;
}