题解 | Financial Management

#include <iostream>
#include <vector>
#include <iomanip>

using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    vector<double> month(12);
    while (cin >> month[0] >> month[1] >> month[2] >> month[3] >> month[4] >>
            month[5] >> month[6] >> month[7] >> month[8] >> month[9] >> month[10] >>
            month[11]) {
        double sum = 0;
        for (double x : month) sum += x;
        sum = sum / 12;
        cout << fixed << setprecision(2) << "$" << sum << "\n";
    }
    return 0;
}