View Compilation Error

0_0_39792087_21718.cpp: In function 'int main()':
0_0_39792087_21718.cpp:21:17: error: 'sort' was not declared in this scope; did you mean 'short'?
   21 |                 sort(a+1,a+n+1,cmp);
      |                 ^~~~
      |                 short