Compilare: user.cpp: In function ‘int Union(int, int, std::vector<int>&)’: user.cpp:34:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:70:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < dist.size(); j++) ~~^~~~~~~~~~~~~ user.cpp:88:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (auto i = 0; i < aux.size(); i++) ~~^~~~~~~~~~~~