func_code_string: #include <bits/stdc++.h>   using namespace std;   long long a[100005];   void solve() {     long long n;     cin >> n;     for (long long i = 0; i < n; i++) cin >> a[i];     sort(a, a + n);     vector<long long> ans;     long long st = 0, end = n - 1;     while (end > st) {       ans.push_back(a[end]);       ans.push_back(a[st]);       st++;       end--;     }     if (st == end) {       ans.push_back(a[st]);     }     reverse((ans).begin(), (ans).end());     for (auto i : ans) {       cout << i <<    ;     }   }   int32_t main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     long long t = 1;     cin >> t;     while (t--) {       solve();       cout <<   n ;     }     return 0;   }   