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 <bits/stdc++.h>
#define ll  long long
using namespace std;
deque<int> dq;
int n,x,ans;
int main(){
	//freopen("all.in","r",stdin);
	//freopen("all.out","w",stdout);
	cin>>n;
	for(int i=0;i<n;i++){
		cin>>x;
		dq.push_back(x);
	}
	while(dq.size()>=2){
		if(dq.front()==dq.back()){
			//cout<<"=";
			dq.pop_back();
			dq.pop_front();
		}
		else if(dq.front()<dq.back()){
			//cout<<"<";
			x=dq.front();
			dq.pop_front();
			dq.front()+=x;
			ans++;
		}
		else if(dq.front()>dq.back()){
			//cout<<">";
			x=dq.back();
			dq.pop_back();
			dq.back()+=x;
			ans++;
		}
	}
	cout<<ans;
	return 0;
}
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