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>
using namespace std;
using tint = long long;
using ld = long double;
#define forsn(i, s, n) for(int i = s; i < int(n); i++)
#define forn(i, n) forsn(i, 0, n)
#define trav(a, x) for(auto& a : x)
using vi = vector<int>;
using vl = vector<tint>;
using vb = vector<bool>;
#define pb push_back
#define pf push_front
#define rsz resize
#define all(x) begin(x), end(x)
#define rall(x) x.rbegin(), x.rend()
#define sz(x) (int)(x).size()
#define ins insert
#define esta(x,c) ((c).find(x) != (c).end())
using pi = pair<int,int>;
using pl = pair<tint,tint>;
#define f first
#define s second
#define mp make_pair
#define DBG(x) cerr << #x << " = " << x << endl;
const int MOD = 1e9+7;
const int mod = 998244353;
const int MX = 3e5+5;
const tint INF = 1e18;
const int inf = 2e9;
const ld PI = acos(ld(-1));
const ld eps = 1e-8;
const int dx[4] = {1, -1, 0, 0};
const int dy[4] = {0, 0, 1, -1};
template<class T> void remDup(vector<T> &v){
sort(all(v)); v.erase(unique(all(v)),end(v));
}
template<class T> bool valid(T x, T y, T n, T m){
return (0<=x && x<n && 0<=y && y<m);
}
void NACHO(string name = "cbarn"){
ios_base::sync_with_stdio(0); cin.tie(0);
//freopen((name+".in").c_str(), "r", stdin);
//freopen((name+".out").c_str(), "w", stdout);
}
int main(){
NACHO();
int n; cin >> n;
vl a (n);
forn(i, n) cin >> a[i];
int i = 0, j = n-1;
int sumL = a[0], sumR = a[n-1];
int quanL = 1, quanR = 1;
int ret = 0;
bool pali = 1;
forn(i, n){
if(a[i] != a[n-i-1]) pali = 0;
}
while(i < j){
if(sumL == sumR){
ret+=quanL-1+quanR-1;
++i; --j;
quanL = 1; quanR = 1;
sumL = a[i];
sumR = a[j];
}else if(sumL < sumR){
++i;
++quanL;
sumL+=a[i];
}else{
--j;
++quanR;
sumR+=a[j];
}
}
if(!pali && ret == 0) ret = n-1;
cout << ret << "\n";
}
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