func_code_string: #include <bits/stdc++.h>   using namespace std;   void fastio() {     ios_base::sync_with_stdio(0);     cin.tie(0);   }   int main() {     fastio();     long long int n;     cin >> n;     long long int ans = 0;     long long int a[n];     for (int i = 0; i < n; i++) cin >> a[i];     for (long long int i = 0; i < n; i += 2) {       long long int sum = 0;       for (long long int j = i + 1; j < n; j += 2) {         long long int x = a[j] - sum;         if (x < 0) {         } else {           ans += min(a[i], x);           if (sum) ans++;         }         sum -= a[j];         if (sum < 0) {           if (abs(sum) > a[i])             break;           else {             a[i] += sum;             sum = 0;           }         }         if (j + 1 < n) sum += a[j + 1];       }     }     cout << ans <<   n ;   }   