/in/foo.cc: In function 'int main()':
/in/foo.cc:9:12: error: 'sort' was not declared in this scope
  sort(a,0,2);
            ^
/in/foo.cc:10:35: error: 'i' was not declared in this scope
     for(int j=0;j<3;j++)cout << a[i] << " ";
                                   ^