Compilare: user.cpp: In function ‘void DFS(int, int)’: user.cpp:61:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[x].size();++i) ^ user.cpp: In function ‘unsigned int getInt()’: user.cpp:22:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf,maxb,1,fin),ptr=0; ^ user.cpp:26:40: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf,maxb,1,fin),ptr=0; ^