Compilare: main.cpp: In function 'int main()': main.cpp:26:7: warning: unused variable 'lat' [-Wunused-variable] int lat = 0; ^~~ main.cpp:37:63: warning: 'c2' may be used uninitialized in this function [-Wmaybe-uninitialized] fout << abs(x1 - c1) + abs(y1 - c2) + abs(x2 - c1) + abs(y2 - c2) << "\n"; ~~~^~~~ main.cpp:37:48: warning: 'c1' may be used uninitialized in this function [-Wmaybe-uninitialized] fout << abs(x1 - c1) + abs(y1 - c2) + abs(x2 - c1) + abs(y2 - c2) << "\n"; ~~~^~~~