Compilare: user.cpp: In function ‘int main()’: user.cpp:53:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(s.size() == (1<<i)){ ^ user.cpp: In function ‘int getLog(int)’: user.cpp:14:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘std::string getAns(int)’: user.cpp:45:1: warning: control reaches end of non-void function [-Wreturn-type] } ^