运行 ID: 121330

Main.cc: In function ‘int main()’:
Main.cc:7:2: error: ‘cin’ was not declared in this scope
  cin>>n;
  ^~~
Main.cc:7:2: note: suggested alternative: ‘main’
  cin>>n;
  ^~~
  main
Main.cc:75:2: error: ‘cout’ was not declared in this scope
  cout<