Compilare: user.cpp: In function ‘void addEdges(double)’: user.cpp:70:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<Stalpi.size(); i++) ^ user.cpp:71:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<Stalpi.size(); j++) ^ user.cpp: In function ‘int DFS(int)’: user.cpp:92:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In member function ‘void Reader::advance()’: user.cpp:55:47: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, SIZE, 1, input_file); ^ user.cpp: In constructor ‘Reader::Reader(const char*)’: user.cpp:13:43: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, SIZE, 1, input_file); ^