Compilare: main.cpp: In function 'int main()': main.cpp:66:17: warning: unused variable 'first_val' [-Wunused-variable] 66 | int first_val = v[j].first - v[i].first, second_val = v[j].second - v[i].second; | ^~~~~~~~~ main.cpp:66:54: warning: unused variable 'second_val' [-Wunused-variable] 66 | int first_val = v[j].first - v[i].first, second_val = v[j].second - v[i].second; | ^~~~~~~~~~