View Compilation Error

0_0_39178651_14801.cpp: In function 'int Free(int, int, int, int)':
0_0_39178651_14801.cpp:72:5: error: 'push_down' was not declared in this scope; did you mean 'pushdown'?
   72 |     push_down(p, pl, pr);
      |     ^~~~~~~~~
      |     pushdown