已AC，我太菜了
```cpp
#include <bits/stdc++.h>
using namespace std;
const int N = 2e6 + 10;
int n, a[N], s[N], ans;
int q[N], h, t;
int main()
{
ios::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
cin >> n;
for (int i = 1; i <= n; i ++)
{
cin >> a[i];
a[i+n] = a[i];
}
for (int i = 1; i <= (n << 1); i ++)
s[i] = s[i-1] + a[i];
h = 1;
t = 0;
for (int i = 1; i <= n; i ++)
{
while (t >= h && s[q[t]] >= s[i]) t --;
q[++t] = i;
}
if (s[q[h]] >= 0) ans ++;
for (int i = 2; i <= n; i ++)
{
int j = i + n - 1;
while (t >= h && s[q[t]] >= s[j]) t --;
q[++t] = j;
while (t >= h && q[h] < i) h ++;
if (s[q[h]] - s[i-1] >= 0) ans ++;
}
cout << ans;
return 0;
}
```
by Zwjoey @ 2023-07-11 10:45:43