func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long int t, i, n, ans = 0, k = 0, mx;     cin >> n;     long long int a[n];     for (i = 0; i < n; i++) {       cin >> a[i];     }     ans = a[0] / 3;     k = a[0] % 3;     for (i = 1; i < n; i++) {       mx = min(k, a[i] / 2);       ans += mx;       k -= mx;       a[i] -= 2 * mx;       ans += a[i] / 3;       k += a[i] % 3;     }     cout << ans;     return 0;   }   