func_code_string: #include <bits/stdc++.h>   using namespace std;   long long a, b, c, d, cnt = 1;   string s;   bool ok = true, mtest = true;   void solve() {     cin >> b;     vector<int> v(b), vc(b);     for (auto& i : v) cin >> i;     for (auto& i : vc) cin >> i;     sort(v.begin(), v.end());     sort(vc.begin(), vc.end());     for (auto i : v) cout << i <<    ;     cout <<   n ;     for (auto i : vc) cout << i <<    ;     cout <<   n ;   }   int main() {     cin >> a;     while (a--) solve();     cerr <<   nTime elapsed:   << 1.0 * clock() / CLOCKS_PER_SEC <<   s. n ;   }   