View Compilation Error

0_0_38707293_2125.cpp:1:11: error: expected constructor, destructor, or type conversion before '(' token
    1 | quick_sort(arr, l, j);
      |           ^
0_0_38707293_2125.cpp:2:15: error: expected constructor, destructor, or type conversion before '(' token
    2 |     quick_sort(arr, j + 1, r);
      |               ^