Compilare: user.cpp: In function ‘void match(int)’: user.cpp:58:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<G[nod].size();++i) ^ user.cpp: In function ‘void Solve()’: user.cpp:78:33: warning: ‘memset’ used with constant zero length parameter; this could be due to transposed parameters [-Wmemset-transposed-args] memset(viz,sizeof(viz),0); ^