题解

#include<iostream>
#include<algorithm>
using namespace std;
int main(){
    int n;
    cin>>n;
    int l=0,r=n-1,s[n],c=0;
    for(int i=0;i<n;i++)cin>>s[i];
    sort(s,s+n);
    while(l<=r){
        c+=s[l];
        l++,r--;
    }
    cout<<c<<endl;
    return 0;
}