Language: C++

#include <bits/stdc++.h>
#include <iostream>

int main() {
  double k,t,a;
  int n;
  cin >> n >> t >> a;
  vector<int> h(n),H(n);
  for(int i=0;i<n;i++){
    cin >> h.at(i);
    k = t - h.at(i)*0.006;
    h.at(i) = max(a-k,k-a);
    H.at(i) = h.at(i);
  }
  sort(h.begin(),h.end());
  for(int i=0;i<n;i++){
    if(h.at(0) == H.at(i)){
      cout << i << endl;
    }
  }
  
  
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    7 |   cin >> n >> t >> a;
      |   ^~~
      |   std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146,
                 from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:8:3: error: 'vector' was not declared in this scope
    8 |   vector<int> h(n),H(n);
      |   ^~~~~~
a.cc:8:3: note: suggested alternatives:
In file included from /usr/include/c++/14/vector:66,
                 from /usr/include/c++/14/functional:64,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:53:
/usr/include/c++/14/bits/stl_vector.h:428:11: note:   'std::vector'
  428 |     class vector : protected _Vector_base<_Tp, _Alloc>
      |           ^~~~~~
/usr/include/c++/14/vector:93:13: note:   'std::pmr::vector'
   93 |       using vector = std::vector<_Tp, polymorphic_allocator<_Tp>>;
      |             ^~~~~~
a.cc:8:10: error: expected primary-expression before 'int'
    8 |   vector<int> h(n),H(n);
      |          ^~~
a.cc:10:12: error: 'h' was not declared in this scope
   10 |     cin >> h.at(i);
      |            ^
a.cc:12:15: error: 'max' was not declared in this scope; did you mean 'std::max'?
   12 |     h.at(i) = max(a-k,k-a);
      |               ^~~
      |               std::max
In file included from /usr/include/c++/14/algorithm:61,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51:
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: 'std::max' declared here
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
a.cc:13:5: error: 'H' was not declared in this scope
   13 |     H.at(i) = h.at(i);
      |     ^
a.cc:15:8: error: 'h' was not declared in this scope
   15 |   sort(h.begin(),h.end());
      |        ^
a.cc:15:3: error: 'sort' was not declared in this scope; did you mean 'std::sort'?
   15 |   sort(h.begin(),h.end());
      |   ^~~~
      |   std::sort
In file included from /usr/include/c++/14/algorithm:86:
/usr/include/c++/14/pstl/glue_algorithm_defs.h:296:1: note: 'std::sort' declared here
  296 | sort(_ExecutionPolicy&& __exec, _RandomAccessIterator __first, _RandomAccessIterator __last);
      | ^~~~
a.cc:17:19: error: 'H' was not declared in this scope
   17 |     if(h.at(0) == H.at(i)){
      |                   ^
a.cc:18:7: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   18 |       cout << i << endl;
      |       ^~~~
      |       std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:18:20: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   18 |       cout << i << endl;
      |                    ^~~~
      |                    std::endl
In file included from /usr/include/c++/14/istream:41,
                 from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~