Compilare: main.cpp: In function 'void DFS(int)': main.cpp:142:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<G[nod].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:17:38: 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); ^ main.cpp: In function 'void DFS(int)': main.cpp:158:14: warning: 'key' may be used uninitialized in this function [-Wmaybe-uninitialized] cmax[nod]=key,ap[nod]=maxx; ~~~~~~~~~^~~~