Compilare: user.cpp: In function ‘void ComputeZVector(std::__cxx11::string)’: user.cpp:17:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=1;k<str.size();k++){ ^ user.cpp:20:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(R<str.size()&&str[R]==str[R-L]) ^ user.cpp:32:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(R<str.size()&&str[R]==str[R-L]) ^ user.cpp: In function ‘void ZAlgoritm(std::__cxx11::string, std::__cxx11::string)’: user.cpp:45:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=needle.size();i<Z.size();i++){ ^ user.cpp:46:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(Z[i]==needle.size()) ^