Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:15:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<graf[nc].size();i++) ^ user.cpp:14:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,p,u,a; ^ user.cpp:14:13: warning: unused variable ‘p’ [-Wunused-variable] int i,j,p,u,a; ^ user.cpp:14:15: warning: unused variable ‘u’ [-Wunused-variable] int i,j,p,u,a; ^ user.cpp:14:17: warning: unused variable ‘a’ [-Wunused-variable] int i,j,p,u,a; ^ user.cpp: In function ‘int main()’: user.cpp:32:19: warning: unused variable ‘grad’ [-Wunused-variable] int n,m,i,a,b,grad,j,ok=1; ^ user.cpp:32:24: warning: unused variable ‘j’ [-Wunused-variable] int n,m,i,a,b,grad,j,ok=1; ^