Compilare: user.cpp: In function ‘void bfs(int)’: user.cpp:18:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<graf[c[p]].size();i++) ^ user.cpp:12:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,p,u,a; ^ user.cpp: In function ‘int main()’: user.cpp:34:19: warning: unused variable ‘grad’ [-Wunused-variable] int n,m,i,a,b,grad,j; ^ user.cpp:34:24: warning: unused variable ‘j’ [-Wunused-variable] int n,m,i,a,b,grad,j; ^