---

Lỗi biên dịch:

Main.cc:33:7: error: expected constructor, destructor, or type conversion before ‘(’ token
     sx(a,n);
       ^
Main.cc:34:2: error: expected unqualified-id before ‘if’
  if (k*3>n)
  ^~
Main.cc:36:2: error: expected unqualified-id before ‘else’
  else
  ^~~~
Main.cc:38:1: error: expected declaration before ‘}’ token
 }
 ^
Main.cc: In function ‘int main(int, const char**)’:
Main.cc:27:10: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
     ~~~~~^~~~~~~~~
Main.cc:28:10: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&k);
     ~~~~~^~~~~~~~~
Main.cc:31:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
            scanf("%d",&a[i]);
            ~~~~~^~~~~~~~~~~~