Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:15:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[x].size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:62:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0,x=Q[ind][i];j<G[x].size();++j) ^ user.cpp:71:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0,x=Q[ind][i];j<G[x].size();++j) ^ user.cpp:86:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0,x=Q[ind][i];j<G[x].size();++j,++cur) ^ user.cpp:95:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0,x=Q[ind][i];j<G[x].size();++j,++cur) ^ user.cpp:44:9: warning: unused variable ‘mic’ [-Wunused-variable] int mic=n; ^