Compilare: user.cpp:54:26: warning: integer constant is so large that it is unsigned [enabled by default] long long maxim=-9223372036854775808; ^ user.cpp: In function ‘void DFS(int)’: user.cpp:37:31: 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:59:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<G[nod].size(); ++j) ^