Compilare: user.cpp: In function ‘void Next(std::string)’: user.cpp:12:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(x=1; x<p.size(); x++) ^ user.cpp: In function ‘int main()’: user.cpp:37:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<t.size(); i++) ^ user.cpp:41:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(x==p.size()-1) ^