Compilare: user.cpp: In function ‘void dijkstra()’: user.cpp:82:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<G[x].size(); ++i) ^ user.cpp: In member function ‘char InParser::read_ch()’: user.cpp:15:39: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, 65536, fin); ^