func_code_string: #include <bits/stdc++.h>   using namespace std;   long long f(vector<int> x, int k) {     long long ret = 0;     sort(x.begin(), x.end());     for (int i = x.size() - 1; i >= 0; i -= k) {       ret += x[i] * 2;     }     return ret;   }   void solve() {     int n, k, mx = 0;     cin >> n >> k;     vector<int> x(n), a, b;     for (int i = 0; i < n; i++) {       cin >> x[i];       mx = max(mx, abs(x[i]));       if (x[i] < 0)         a.push_back(-x[i]);       else         b.push_back(x[i]);     }     cout << f(a, k) + f(b, k) - mx << endl;   }   int main() {     int tt = 1;     cin >> tt;     while (tt--) solve();   }   