Mã chấm: 268447

Main.cc: In function ‘int main()’:
Main.cc:8:19: error: ‘n’ was not declared in this scope
     scanf("%lf", &n);
                   ^
Main.cc:8:19: note: suggested alternative: ‘yn’
     scanf("%lf", &n);
                   ^
                   yn
Main.cc:12:5: error: expected unqualified-id before ‘return’
     return 0;
     ^~~~~~