Mã chấm: 269182

Main.cc: In function ‘int main()’:
Main.cc:15:5: error: ‘scanf’ was not declared in this scope
     scanf("%d", &n);
     ^~~~~
Main.cc:19:5: error: ‘printf’ was not declared in this scope
     printf("%.5f\n", result);
     ^~~~~~
Main.cc:19:5: note: suggested alternative: ‘int’
     printf("%.5f\n", result);
     ^~~~~~
     int