Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:90:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<gr[nod].size();i++) ~^~~~~~~~~~~~~~~ main.cpp: In function 'void dfs2(int, int)': main.cpp:104:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<gr[node].size();i++) ~^~~~~~~~~~~~~~~~ main.cpp:112:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<ant[node].size();i++) ~^~~~~~~~~~~~~~~~~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:16:29: 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); ^