View Compilation Error

0_0_39356873_14839.cpp: In function 'void tree()':
0_0_39356873_14839.cpp:20:9: error: 'sort' was not declared in this scope; did you mean 'short'?
   20 |         sort(e + 1, e + 1 + m, cmp);
      |         ^~~~
      |         short