View Compilation Error

0_0_39667495_27530.cpp: In function 'int main()':
0_0_39667495_27530.cpp:34:17: error: 'sort' was not declared in this scope; did you mean 'short'?
   34 |                 sort(nd+1,nd+n*(n-1)/2+1,cmp);
      |                 ^~~~
      |                 short