func_code_string: #include <bits/stdc++.h>   using namespace std;   const int MOD = 1e9 + 7;   void solve() {     int n, k;     cin >> n >> k;     vector<int> a(n * k);     for (auto &it : a) cin >> it;     reverse(a.begin(), a.end());     long long ans = 0;     int mid = n / 2, cnt = 0;     for (int i = mid; i < (int)a.size() && cnt++ != k; i += mid + 1) {       ans += a[i];     }     cout << ans <<   n ;   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     int t;     cin >> t;     while (t--) {       solve();     }   }   