This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <cstdio>
#include <iostream>
using namespace std;
int n;
int a[1000001];
int l,r;
int ans;
int main()
{
cin>>n;
for(int i=1;i<=n;i++)
cin>>a[i];
l=1,r=n;
while(l-1<r)
{
if(a[l]==a[r])
{
l++,r--;
continue;
}
if(a[l]>a[r])
{
a[r-1]+=a[r];
r--;
ans++;
}
else
{
a[l+1]+=a[l];
l++;
ans++;
}
}
cout<<ans;
return 0;
}
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