https://www.
只得了80分，不知道哪里出问题了
#include<bits/stdc++.h>
using namespace std;
int main()
{
    long a,b,s,i,x,z,h;
    s=0,z=0;
    for(i=1;i<=12;i++)
    {
        cin>>a;
        s=s+300-a;
        if(s>=100)
        {
            x=s-s%100;
            z=z+x;
            s=s-x;
        }
        else if(s<0) h=i;
        if(i==12)
        {
            s=s+z*1.2;
            z=0;
            if(h<1|h>=12) cout<<s;
        }
    }
    if(h>=1&&h<12) cout<<"-"<<h;
    return 0;
}

Thank you.