Compilare: user.cpp: In function ‘int main()’: user.cpp:30:23: warning: ‘dr’ may be used uninitialized in this function [-Wmaybe-uninitialized] g << st << ' ' << dr << ' ' << sol; ^ user.cpp:30:10: warning: ‘st’ may be used uninitialized in this function [-Wmaybe-uninitialized] g << st << ' ' << dr << ' ' << sol; ^