我的代码如下，有点冗长，希望谅解！

代码如下：

#include <iostream>
#include <cstdio>
#include <vector>
#include <map>
#include <string>
#include <set>

using namespace std;

// Get 300 yuan each month
int main() {
    int save = 0; // Save by mum
    int death_month = 0; // The month which die
    int money = 0; // Money in hands
    int use = 0; // Will/Already used
    for (int i = 0; i < 12; i++) {
        money += 300;
        cin >> use; 
        money -= use;
        if (money < 0) {
            death_month = i;
            cout << death_month << endl;
            break;
        }
        else {
            save += money / 100;
            money %= 100;
        }
        while (i == 12) {
            if (save = 0) {
                cout << money << endl;
                break;
            }
            else {
                money += save * 20 + save * 100 + save * 100;
                cout << money << endl;
                break;
            }
        }
    }
    return 0;
}

谢谢解答！！！