func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 2e5 + 10;   int t, n, a[N];   int main() {     ios::sync_with_stdio(false);     for (cin >> t; t; t--) {       cin >> n;       long long l = 0, r = 0;       for (int i = 1; i <= n; i++) {         cin >> a[i];         l += a[i];         r ^= a[i];       }       cout << 2 <<   n  << r <<     << (l + r) <<   n ;     }     return 0;   }   