Compilare: user.cpp: In function ‘void BFS()’: user.cpp:37:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<a[nod].size(); i++) ^ user.cpp:29:13: warning: variable ‘nr’ set but not used [-Wunused-but-set-variable] int nod,nr,i; ^ user.cpp: In function ‘int DFSup(int, int)’: user.cpp:49:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<a[x].size(); i++) ^ user.cpp: In function ‘int DFSdown(int, int)’: user.cpp:59:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<a[x].size(); i++) ^