是不是因为if特判
```
if (c<0) cout<<0-i;
```
应该加到循环中？
下面是我的AC代码
```cpp
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
int main()
{
int sum=0,ans=0,a;
for(int i=1;i<=12;i++)
{
ans+=300;
cin>>a;
ans-=a;
if(ans<0)
{
cout<<-i;
return 0;
}
sum+=ans/100;
ans%=100;
}
cout<<sum*120+ans;
return 0;
}
```
by gaoleng_luogu_name @ 2023-06-30 20:04:37
谢谢
by Howells @ 2023-06-30 20:22:34