func_code_string: #include <bits/stdc++.h>   #pragma GCC optimize( O3 )   #pragma GCC optimize( Ofast )   using namespace std;   void solve() {     long long n;     cin >> n;     vector<long long> a(n), b(n);     for (long long &i : a) cin >> i;     for (long long &i : b) cin >> i;     sort(a.begin(), a.end());     sort(b.begin(), b.end());     for (long long &i : a) cout << i <<    ;     cout << endl;     for (long long &i : b) cout << i <<    ;     cout << endl;   }   signed main() {     ios_base::sync_with_stdio(0);     cin.tie();     cout.tie();     long long n = 1;     cin >> n;     while (n--) solve();     return 0;   }   