Compilare: user.cpp: In constructor ‘Perm::Perm(int)’: user.cpp:91:5: warning: ‘Perm::n’ will be initialized after [-Wreorder] int n, level; ^ user.cpp:90:13: warning: ‘std::vector<int> Perm::stack’ [-Wreorder] vector<int> stack; ^ user.cpp:13:8: warning: when initialized here [-Wreorder] Perm(int N): n(N), stack(n+1){}; ^ user.cpp: In function ‘int main()’: user.cpp:13:34: warning: ‘p.Perm::n’ is used uninitialized in this function [-Wuninitialized] Perm(int N): n(N), stack(n+1){}; ^ user.cpp:98:10: note: ‘p.Perm::n’ was declared here Perm p = Perm(n); ^