Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:33:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<arb[nod].size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:69:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();++i) ^