Mã chấm: 269485

Main.cc: In function ‘int main()’:
Main.cc:8:5: error: ‘cout’ was not declared in this scope
     cout << "Nhap so nguyen duong n: ";
     ^~~~
Main.cc:8:5: note: suggested alternative: ‘cosl’
     cout << "Nhap so nguyen duong n: ";
     ^~~~
     cosl
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:19:5: error: expected primary-expression before ‘return’
     return 0;
     ^~~~~~