func_code_string: #include <bits/stdc++.h>   using namespace std;   const int MAX = 109;   int a[MAX], n, k, t = 1e9, s;   int main() {     cin >> n;     for (int i = 0; i < 2 * n - 1; i++) {       cin >> a[i], s += abs(a[i]), t = min(t, abs(a[i]));       if (a[i] < 0) k++;     }     if (k % 2 && n % 2 == 0) s -= 2 * t;     cout << s;   }   