func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int t, n, m, i, min, count, a[101], sum, count0;     cin >> t;     while (t--) {       cin >> n >> m;       count = 0;       sum = 0;       count0 = 0;       for (i = 0; i < (n * m); i++) {         cin >> a[i];         if (a[i] < 0) {           count++;           a[i] = -1 * a[i];         }         if (a[i] == 0) count0 = 1;         sum += a[i];       }       if (count % 2 != 0 && count0 != 1) {         min = a[0];         for (i = 0; i < (n * m); i++) {           if (a[i] < min) min = a[i];         }         cout << sum - (2 * min) << endl;       } else         cout << sum << endl;     }     return 0;   }   