Compilare: user.cpp: In function ‘void depth(int, std::vector<int>*, int)’: user.cpp:36:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < a[nod].size(); i++) ^ user.cpp:29:9: warning: variable ‘ok’ set but not used [-Wunused-but-set-variable] int ok = 0; ^ user.cpp: In function ‘int main()’: user.cpp:59:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(sol.size() == n){ ^