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 ll = long long;
using ld = long double;
const int N = 1e6 + 500;
int n, ans, a[N];
int main() {
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
cin >> n;
for (int i = 0; i < n; ++i)
cin >> a[i];
int l = 0, r = n - 1;
while (l < r) {
if (a[l] == a[r]) {
++l, --r;
continue;
}
if (a[l] < a[r]) {
a[l + 1] += a[l];
++l;
++ans;
} else {
a[r - 1] += a[r];
--r;
++ans;
}
}
cout << ans << "\n";
}
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