func_code_string: #include <bits/stdc++.h>   using namespace std;   long long a[200500];   long long res[200500];   long long n;   bool check(long long x) {     for (long long i = 0; i < n; i++) {       res[i] = 0;     }     for (long long i = n - 1; i >= 2; i--) {       long long f = (a[i] + res[i]) - x;       if (f < 0) {         return false;       }       long long k = min((f / 3), (a[i] / 3));       res[i - 1] += k;       res[i - 2] += 2 * k;     }     if (a[0] + res[0] < x) {       return false;     }     if (a[1] + res[1] < x) {       return false;     }     return true;   }   signed main() {     long long t;     cin >> t;     while (t--) {       cin >> n;       for (long long i = 0; i < n; i++) {         cin >> a[i];       }       long long l = 0, r = 2000000000;       while (r - l > 1) {         long long mid = (l + r) / 2;         if (check(mid)) {           l = mid;         } else {           r = mid;         }       }       cout << l <<   n ;     }   }   