Mã chấm: 98684

Main.cc: In function ‘int main()’:
Main.cc:32:5: error: ‘cin’ was not declared in this scope
     cin >> n; 
     ^~~
Main.cc:32:5: note: suggested alternative: ‘main’
     cin >> n; 
     ^~~
     main
Main.cc:40:5: error: ‘cout’ was not declared in this scope
     cout <