func_code_string: #include <bits/stdc++.h>   using namespace std;   void solve() {     int n;     std::cin >> n;     std::vector<int> v(101);     for (int i = 0; i < n; ++i) {       int temp;       std::cin >> temp;       v[temp]++;     }     int mex_A = -1;     int mex_B = -1;     bool flag1 = 1;     for (int i = 0; i < n; ++i) {       if (v[i] > 1 && flag1) {         mex_A = mex_B = i;       } else if (v[i] >= 1) {         mex_A = i;         flag1 = 0;       } else if (v[i] == 0) {         break;       }     }     std::cout << ++mex_A + ++mex_B <<   n ;   }   int main() {     int x;     cin >> x;     while (x--) solve();     return 0;   }   