Compilare: user.cpp: In function ‘int getkey(std::string)’: user.cpp:27:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < x.size(); ++i) ^ user.cpp: In function ‘int add(std::string)’: user.cpp:36:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < h[key].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:74:32: warning: ‘rad’ may be used uninitialized in this function [-Wmaybe-uninitialized] string k = "1" + getnum(rad); ^