func_code_string: #include <bits/stdc++.h>   using namespace std;   const double v = 1.41421356237;   int main() {     ios_base::sync_with_stdio(false), cin.tie(NULL), cout.tie(NULL);     int t = 1;     cin >> t;     while (t--) {       long long int x1, y1, z1, x2, y2, z2;       cin >> x1 >> y1 >> z1 >> x2 >> y2 >> z2;       long long int m, sum = 0;       m = min(z1, y2);       sum += (2 * m);       m = min(x1, z2);       x1 -= m;       z2 -= m;       m = min(y1, x2);       y1 -= m;       x2 -= m;       sum -= (2 * min(y1, z2));       cout << sum << endl;     }   }   