func_code_string: #include <bits/stdc++.h>   using namespace std;   int a[111];   int main() {     int mx = 1000000000;     int cnt, n;     scanf( %d , &n);     int sum = 0;     cnt = 0;     int k = 0;     for (int i = 1; i < n * 2; ++i) {       scanf( %d , &a[i]);       sum += abs(a[i]);       mx = ((mx) < (abs(a[i])) ? (mx) : (abs(a[i])));       if (a[i] < 0) {         cnt++;       }       if (a[i] == 0) k++;     }     if (cnt % 2 == 0 || n % 2 == 1 || k != 0)       printf( %d n , sum);     else {       printf( %d n , sum - mx - mx);     }   }   