Compilare: user.cpp: In constructor ‘Permut::Permut(int)’: user.cpp:97:8: warning: ‘Permut::N’ will be initialized after [-Wreorder] int N, ^ user.cpp:95:13: warning: ‘std::vector<int> Permut::vec’ [-Wreorder] vector<int> vec, ^ user.cpp:13:8: warning: when initialized here [-Wreorder] Permut(int n): N(n), vec(n+1), Stack(n+1){} ^ user.cpp: In function ‘int main()’: user.cpp:106:28: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(FOUT, "w", stdout); ^