Compilare: user.cpp: In function ‘void dfs1(int)’: user.cpp:70:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<fals[nod].size();++i) ^ user.cpp: In function ‘void dfs2(int)’: user.cpp:86:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<adev[nod].size();++i) ^ user.cpp: In function ‘void dfs3(int)’: user.cpp:97:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<adev[nod].size();++i){ ^ user.cpp: In member function ‘char InParser::read_ch()’: user.cpp:13:38: 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, 4096, fin); ^