Compilare: user.cpp: In function ‘int BFS(int)’: user.cpp:56:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();++i) { ^ user.cpp: In function ‘unsigned int getInt()’: user.cpp:32:36: 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:36:40: 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; ^ user.cpp: In function ‘int BFS(int)’: user.cpp:65:9: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] return x; ^