题解 | 小明卖食物

#include<iostream>
using namespace std;

int main() {
    int sum = 0;
    int n;
    cin >> n;
    int V[n];
    for (int i = 0; i < n; cin >> V[i++]);
    for (int i = 0, j = n-1, k = 1; k <= n; k++ ) {
        if (V[i] < V[j]) {
            sum += V[i] * k;
            i++;
        } else {
            sum += V[j] * k;
            j--;
        }
    }
    cout << sum;
    return 0;
}