#include <stdio.h>
#include<algorithm>
#include<iostream>

const int mon = 300;

int main() {
    using namespace std;
    int rem = 0, count = 0;
    int a[14] = { 0 };
    int i=0;
    int flag=0;
    for (i = 1; i <= 12; i++) {
        cin >> a[i];
        rem = rem + mon;
            rem=rem- a[i];
        if (rem < 0) {
            flag = i;
        }

        if (rem > 100) {
            count = count + (rem / 100) * 100;
            rem = rem % 100;
        }
    }
    if (flag != 0) {
        cout << -flag << endl;
    }
    else {
        cout << count * 1.2+rem << endl;
    }
    
    return 0;

代码大概就是长这样（感觉问题不大呀