/in/foo.cc: In function 'int main()':
/in/foo.cc:16:12: error: expected ',' or ';' before '...' token
  int a[]={}...,n=;
            ^~~
/in/foo.cc:17:8: error: expected primary-expression before '...' token
  int x=...
        ^~~
/in/foo.cc:20:13: error: 'n' was not declared in this scope
  int i=0, j=n-1;
             ^