func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int t;     cin >> t;     for (int q = 1; q <= t; q++) {       int n;       int k;       cin >> n >> k;       long long a[n * k + 10];       long long ans = 0;       for (int i = 1; i <= n * k; i++) cin >> a[i];       int ind = n * k - n / 2;       int cnt = n / 2 + 1;       int col = 0;       while (ind > col) {         ans += a[ind];         ind -= cnt;         if (ind > 0) col += n - cnt;       }       cout << ans <<   n ;     }     return 0;   }   