answer.code: In function ‘int main()’:
answer.code:205:1: error: ‘sort’ was not declared in this scope; did you mean ‘std::sort’?
  205 | sort(indu+1,indu+n+1);
      | ^~~~
      | std::sort
In file included from /usr/include/c++/11/algorithm:62,
                 from answer.code:2:
/usr/include/c++/11/bits/stl_algo.h:4863:5: note: ‘std::sort’ declared here
 4863 |     sort(_RandomAccessIterator __first, _RandomAccessIterator __last,
      |     ^~~~