Main.cc: In function ‘int main()’:
Main.cc:6:2: error: ‘cin’ was not declared in this scope
cin >> n;
^~~
Main.cc:6:2: note: suggested alternative: ‘main’
cin >> n;
^~~
main
Main.cc:13:2: error: ‘cout’ was not declared in this scope
cout << aMax;
^~~~