Compilare: user.cpp: In function ‘long long int factorial(int)’: user.cpp:16:10: warning: statement has no effect [-Wunused-value] for(x;x>1;x--) ^ user.cpp: In function ‘int main()’: user.cpp:27:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<road.length();i++) ^ user.cpp:35:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<road.length();i++) ^