/in/p2.cpp: In function 'opaque_list* insert_list_helper(list_t, list_t, unsigned int, list_t)':
/in/p2.cpp:217:8: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if (n == size(first))
      ~~^~~~~~~~~~~~~~
/in/p2.cpp: In function 'opaque_list* chop(list_t, unsigned int)':
/in/p2.cpp:241:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if (size(list) == n) {
      ~~~~~~~~~~~^~~~
/in/p2.cpp: In function 'bool tree_hasPathSum(tree_t, int)':
/in/p2.cpp:382:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^