求教！

一直WA，向大佬求教

#include <iostream>
#include <cstdio>
using namespace std;
int main() {
    int n;
    cin >> n;
    double a[n];
    double b=0;
    for (int i=0;i<n;i++){
        cin >> a[i];
    }
    double minn=a[0];
    double maxx=a[0];
    for (int i=1;i<n;i++){
        if (a[i]<minn){
            minn=a[i];
        }
        if (a[i]>maxx){
            maxx=a[i];
        }
    }

    for (int i=0;i<n;i++){
        b = b+a[i];
    }
    b=b-maxx-minn;
    b = b/(n-2); 
    printf("%.21f",b);
    return 0;
}