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;
const int N = 1e6 + 7;
int n, a[N];
int main() {
    ios::sync_with_stdio(0); cin.tie(0);
    cin >> n;
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
    }
    int l = 1, r = n, cnt = 0;
    for (; l < r; ) {
        if (a[l] == a[r]) {
            l++; 
            r--; // (l + 1, r - 1)
        }
        else {
            if (a[l] > a[r]) {
                a[r - 1] += a[r];
                r--; // (l, r - 1)
                cnt++;
            }
            else {
                a[l + 1] += a[l];
                l++; // (l + 1, r - 1)
                cnt++;
            }
        }
    }
    cout << cnt;
    return 0;   
}
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