Compilare: user.cpp: In function 'void assign(std::vector<node, std::allocator<node> >*, Node*, int, int)': user.cpp:21: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'void dfs(std::vector<node, std::allocator<node> >*, Node*)': user.cpp:38: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int main()': user.cpp:59: warning: 'dis' may be used uninitialized in this function