Compilare: user.cpp: In function ‘void dfs(int, int, int, int, int)’: user.cpp:22:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<vecini[nod].size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:54:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<vecini[a].size();++j) ^ user.cpp:61:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<vecini[b].size();++j) ^