Mã chấm: 268829

Main.cc: In function ‘int main()’:
Main.cc:9:5: error: ‘cin’ was not declared in this scope
     cin>>n;
     ^~~
Main.cc:9:5: note: suggested alternative: ‘sin’
     cin>>n;
     ^~~
     sin
Main.cc:15:5: error: ‘cout’ was not declared in this scope
     cout<