Compilare: user.cpp: In member function ‘void Vertex::addword(std::string, int)’: user.cpp:51: warning: comparison between signed and unsigned integer expressions user.cpp: In member function ‘void Vertex::delword(std::string, int)’: user.cpp:66: warning: comparison between signed and unsigned integer expressions user.cpp: In member function ‘int Vertex::countwords(std::string, int)’: user.cpp:90: warning: comparison between signed and unsigned integer expressions user.cpp: In member function ‘int Vertex::maxprefix(std::string, int, int)’: user.cpp:110: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:125: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:126: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:135: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result