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 ff first
#define ss second
#define endl '\n'
using namespace std;
const long long INF = (long long) 1e18;
const int mod = (int) 1e9+7;
const int MAXN = (int) 3e5+5;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
ll n;
int a[MAXN];
int do_it(int l, int r){
if(l >= r){
return 0;
}
if(a[l] == a[r]){
return do_it(l + 1, r - 1);
}else{
if(a[l] < a[r]){
a[l + 1] += a[l];
return do_it(l + 1, r) + 1;
}else{
a[r - 1] += a[r];
return do_it(l, r - 1) + 1;
}
}
}
int main(){
ios_base::sync_with_stdio(false);
cin.tie(nullptr);cout.tie(nullptr);
#ifdef Local
freopen("../IO/int.txt","r",stdin);
freopen("../IO/out.txt","w",stdout);
#endif
cin>>n;
for(int i = 0; i < n; i++){
cin>>a[i];
}
cout<<do_it(0, n - 1)<<endl;
#ifdef Local
cout<<endl<<fixed<<setprecision(2)<<1000.0 * clock() / CLOCKS_PER_SEC<< " milliseconds ";
#endif
}
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