Language: C++

#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
typedef long long ll;

int P(int n) {
  ll x=1;
  for(int i=1; i<=n; i++) x*=i;
  return x;
}

int main() {
  ll n; cin>>n;
  ll p[n]; ll q[n];
  rep(i, n) p[i];
  rep(i, n) q[i];
  ll p=0; ll q=0;
  for(int i=0; i<n; i++) {
    p+=P(n-i-1)*p[i];
  }
  for(int i=0; i<n; i++) {
    q+=P(n-i-1)*q[i];
  }
  cout << max(p, q)-min(p, q);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:17:6: error: conflicting declaration 'll p'
   17 |   ll p=0; ll q=0;
      |      ^
a.cc:14:6: note: previous declaration as 'll p [n]'
   14 |   ll p[n]; ll q[n];
      |      ^
a.cc:17:14: error: conflicting declaration 'll q'
   17 |   ll p=0; ll q=0;
      |              ^
a.cc:14:15: note: previous declaration as 'll q [n]'
   14 |   ll p[n]; ll q[n];
      |               ^
a.cc:19:6: error: incompatible types in assignment of 'll' {aka 'long long int'} to 'll [n]' {aka 'long long int [n]'}
   19 |     p+=P(n-i-1)*p[i];
      |     ~^~~~~~~~~~~~~~~
a.cc:22:6: error: incompatible types in assignment of 'll' {aka 'long long int'} to 'll [n]' {aka 'long long int [n]'}
   22 |     q+=P(n-i-1)*q[i];
      |     ~^~~~~~~~~~~~~~~
a.cc:24:14: error: no matching function for call to 'max(ll [n], ll [n])'
   24 |   cout << max(p, q)-min(p, q);
      |           ~~~^~~~~~
In file included from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:24:14: note:   variable-sized array type 'll [n]' {aka 'long long int [n]'} is not a valid template argument
   24 |   cout << max(p, q)-min(p, q);
      |           ~~~^~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:24:14: note:   mismatched types 'std::initializer_list<_Tp>' and 'll*' {aka 'long long int*'}
   24 |   cout << max(p, q)-min(p, q);
      |           ~~~^~~~~~
a.cc:24:24: error: no matching function for call to 'min(ll [n], ll [n])'
   24 |   cout << max(p, q)-min(p, q);
      |                     ~~~^~~~~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::min(const _Tp&, const _Tp&)'
  233 |     min(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note:   template argument deduction/substitution failed:
a.cc:24:24: note:   variable-sized array type 'll [n]' {aka 'long long int [n]'} is not a valid template argument
   24 |   cout << max(p, q)-min(p, q);
      |                     ~~~^~~~~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::min(const _Tp&, const _Tp&, _Compare)'
  281 |     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note:   candidate expects 3 arguments, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5686:5: note: candidate: 'template<class _Tp> constexpr _Tp std::min(initializer_list<_Tp>)'
 5686 |     min(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5686:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5696:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::min(initializer_list<_Tp>, _Compare)'
 5696 |     min(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5696:5: note:   template argument deduction/substitution failed:
a.cc:24:24: note:   mismatched types 'std::initializer_list<_Tp>' and 'll*' {aka 'long long int*'}
   24 |   cout << max(p, q)-min(p, q);
      |                     ~~~^~~~~~