Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:11:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[nod].size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:37:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[1].size();i++){ ^ user.cpp:47:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[i].size();j++){ ^