Compilare: user.cpp: In function ‘int main()’: user.cpp:45:65: warning: ‘b’ may be used uninitialized in this function [-Wmaybe-uninitialized] g << "1\n" << k << ' ' << k + 1 << '\n' << a << '\n' << b << '\n' << f3; ^ user.cpp:45:52: warning: ‘a’ may be used uninitialized in this function [-Wmaybe-uninitialized] g << "1\n" << k << ' ' << k + 1 << '\n' << a << '\n' << b << '\n' << f3; ^ user.cpp:45:80: warning: ‘f3’ may be used uninitialized in this function [-Wmaybe-uninitialized] g << "1\n" << k << ' ' << k + 1 << '\n' << a << '\n' << b << '\n' << f3; ^