P1090 传送门

#include <bits/stdc++.h>
using namespace std;
int main(){
    int n, a[10005];
    cin >> n;
    for (int i = 1; i <= n; i++){
        cin >> a[i];
    }
    sort(a + 1, a + n + 1);
    for (int i = 1; i <= n - 1; i++){
        a[i + 1] = a[i] + a[i + 1];
        sort(a + i + 1, a + n + 1);
    }
    cout << a[n];
    return 0;
}