func_code_string: #include <bits/stdc++.h>   using namespace std;   long long a[101];   long long vis[101];   long long judge(vector<long long> A) {     if (A.empty()) return 0;     for (long long i = 0; i < A.size(); i++) {       if (A[i] != i) return i;     }     return A.size();   }   signed main() {     long long t;     cin >> t;     while (t--) {       long long n;       cin >> n;       for (long long i = 1; i <= n; i++) cin >> a[i];       sort(a + 1, a + n + 1);       memset(vis, 0, sizeof vis);       vector<long long> A, B;       vis[1] = 1;       A.push_back(a[1]);       for (long long i = 2; i <= n; i++) {         if (a[i] != a[i - 1]) {           vis[i] = 1;           A.push_back(a[i]);         }       }       for (long long i = 1; i <= n; i++) {         if (!vis[i]) {           B.push_back(a[i]);         }       }       B.erase(unique(B.begin(), B.end()), B.end());       cout << judge(A) + judge(B) << endl;     }     return 0;   }   