Language: C++

╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓▓▓▓▓▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬
//╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓▓▓▓╬╬╬╬╬╬▓▓▓▓▓▓▓╬╬╬╬╬╬╬╬╬
//╬╬╬╬╬╬╬╬╬╬╬╬▓▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓▓▓╬╬╬╬╬╬
//╬╬╬╬╬╬╬╬╬╬▓▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓▓╬╬╬╬
//╬╬╬╬╬╬╬▓▓▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓▓╬╬
//╬╬╬╬╬╬▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓▓
//╬╬╬╬╬▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬
//╬╬╬╬▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓▓╬╬╬╬╬╬╬╬╬╬╬╬╬
//╬╬╬▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓▓▓▓╬╬╬╬╬╬╬╬╬╬╬╬
//╬▓▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓▓▓▓╬╬╬╬╬╬╬╬╬╬╬╬
//▓▓╬╬╬╬╬╬▓▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓▓▓▓╬╬╬╬╬╬╬╬╬╬╬╬
//╬╬╬╬╬╬╬▓▓▓▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓▓╬╬╬╬╬╬╬╬╬╬╬╬╬
//╬╬╬╬▓╬╬▓▓▓▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓╬╬╬╬╬
//╬╬╬▓╬╬╬╬▓▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬▒▒▒╬╬╬╬▓╬╬╬╬
//╬╬╬▓╬╬╬╬╬╬╬╬╬╬╬▓╬╬▓╬╬╬╬╬╬╬╬╬▒▒▒╬╬╬╬▓╬╬╬╬
//╬╬╬▓╬╬╬╬╬╬╬╬╬▓▓╬▓▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓▓╬╬╬
//╬╬╬▓╬▒▒▒╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓▓▓╬╬
//╬╬╬▓╬▒▒▒╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓╬╬▓╬
//╬╬╬▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓╬╬╬╬▓
//╬╬╬▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓╬╬╬╬╬╬
//╬╬╬╬▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓╬╬╬╬╬╬╬
//╬╬╬╬▓▓▓╬╬╬╬╬▓▓╬╬╬╬╬▓╬╬▓╬╬╬╬╬╬▓▓╬╬╬╬╬╬╬╬╬
//╬╬╬▓╬╬╬▓▓╬╬▓╬╬▓╬╬╬▓╬╬╬╬▓╬▓▓▓▓╬╬╬╬╬╬╬╬╬╬╬
//╬╬▓╬╬╬╬╬╬╬▓╬╬╬▓▓▓▓▓╬╬╬╬╬▓╬╬╬▓╬▓▓▓▓▓▓╬╬╬╬
//▓▓╬╬╬╬╬╬╬╬▓╬╬╬▓╬╬╬╬▓╬╬╬╬╬▓╬╬▓▓╬╬╬╬╬╬▓▓╬╬
//╬╬╬╬╬╬╬╬╬╬▓╬╬╬▓╬╬╬╬╬▓╬╬╬╬▓╬╬╬▓╬╬╬╬╬╬╬╬▓╬
//╬╬╬╬╬╬╬╬╬╬▓╬╬▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓╬╬╬╬╬╬╬╬▓╬
//╬╬╬╬╬╬╬╬╬╬▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓╬╬╬╬╬╬╬╬▓
//╬╬╬╬╬╬╬╬╬╬▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓
//╬╬╬╬╬╬╬╬╬▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓╬╬▓╬╬╬╬▓
//╬╬╬╬╬╬╬╬╬▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓╬╬▓╬╬╬╬▓
//╬╬╬╬╬╬╬╬╬▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓╬▓╬╬╬╬╬▓
//╬╬╬╬╬╬╬╬╬▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓▓╬╬╬╬╬▓╬
//╬╬╬╬╬╬╬╬╬▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓╬╬╬╬╬╬▓╬
//╬╬╬╬╬╬╬╬╬▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓╬╬╬╬╬▓▓╬╬
//╬╬╬╬╬╬╬╬╬╬▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓▓▓▓▓▓▓╬╬╬╬
//╬╬╬╬╬╬╬╬╬╬▓▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓╬╬╬╬╬╬╬╬╬╬╬

#include "bits/stdc++.h"
using namespace std;
#define MOD 1000000007
#define INF 1LL<<50
#define fst first
#define sec second
#define pb push_back
#define int long long
#define ALL(obj) (obj).begin(), (obj).end()
#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define RFOR(i,a,b) for(int i = (b-1);i>=a;i--)
#define REP(i,n)  FOR(i,0,n)
#define RREP(i,n) RFOR(i,0,n)
#define ITR(itr,mp) for(int itr = (mp).begin(); itr != (mp).end(); ++itr)
#define RITR(itr,mp) for(int itr = (mp).rbegin(); itr != (mp).rend(); ++itr)
#define debug(x)  cout << #x << " = " << (x) << endl;
typedef long long ll;
typedef pair<ll,ll> P;

signed main(){
  ios::sync_with_stdio(false);
  cin.tie(0);

  

  return 0;
}

Compiler output:
a.cc:1:1: error: extended character ╬ is not valid in an identifier
    1 | ╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓▓▓▓▓▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬
      | ^
a.cc:1:1: error: extended character ╬ is not valid in an identifier
a.cc:1:1: error: extended character ╬ is not valid in an identifier
a.cc:1:1: error: extended character ╬ is not valid in an identifier
a.cc:1:1: error: extended character ╬ is not valid in an identifier
a.cc:1:1: error: extended character ╬ is not valid in an identifier
a.cc:1:1: error: extended character ╬ is not valid in an identifier
a.cc:1:1: error: extended character ╬ is not valid in an identifier
a.cc:1:1: error: extended character ╬ is not valid in an identifier
a.cc:1:1: error: extended character ╬ is not valid in an identifier
a.cc:1:1: error: extended character ╬ is not valid in an identifier
a.cc:1:1: error: extended character ╬ is not valid in an identifier
a.cc:1:1: error: extended character ╬ is not valid in an identifier
a.cc:1:1: error: extended character ╬ is not valid in an identifier
a.cc:1:1: error: extended character ╬ is not valid in an identifier
a.cc:1:1: error: extended character ╬ is not valid in an identifier
a.cc:1:1: error: extended character ╬ is not valid in an identifier
a.cc:1:1: error: extended character ╬ is not valid in an identifier
a.cc:1:1: error: extended character ▓ is not valid in an identifier
a.cc:1:1: error: extended character ▓ is not valid in an identifier
a.cc:1:1: error: extended character ▓ is not valid in an identifier
a.cc:1:1: error: extended character ▓ is not valid in an identifier
a.cc:1:1: error: extended character ▓ is not valid in an identifier
a.cc:1:1: error: extended character ▓ is not valid in an identifier
a.cc:1:1: error: extended character ╬ is not valid in an identifier
a.cc:1:1: error: extended character ╬ is not valid in an identifier
a.cc:1:1: error: extended character ╬ is not valid in an identifier
a.cc:1:1: error: extended character ╬ is not valid in an identifier
a.cc:1:1: error: extended character ╬ is not valid in an identifier
a.cc:1:1: error: extended character ╬ is not valid in an identifier
a.cc:1:1: error: extended character ╬ is not valid in an identifier
a.cc:1:1: error: extended character ╬ is not valid in an identifier
a.cc:1:1: error: extended character ╬ is not valid in an identifier
a.cc:1:1: error: extended character ╬ is not valid in an identifier
a.cc:1:1: error: extended character ╬ is not valid in an identifier
a.cc:1:1: error: extended character ╬ is not valid in an identifier
a.cc:1:1: error: extended character ╬ is not valid in an identifier
a.cc:1:1: error: extended character ╬ is not valid in an identifier
a.cc:1:1: error: extended character ╬ is not valid in an identifier
a.cc:1:1: error: extended character ╬ is not valid in an identifier
a.cc:1:1: error: '\U0000256c\U0000256c\U0000256c\U0000256c\U0000256c\U0000256c\U0000256c\U0000256c\U0000256c\U0000256c\U0000256c\U0000256c\U0000256c\U0000256c\U0000256c\U0000256c\U0000256c\U0000256c\U00002593\U00002593\U00002593\U00002593\U00002593\U00002593\U0000256c\U0000256c\U0000256c\U0000256c\U0000256c\U0000256c\U0000256c\U0000256c\U0000256c\U0000256c\U0000256c\U0000256c\U0000256c\U0000256c\U0000256c\U0000256c' does not name a type
    1 | ╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓▓▓▓▓▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/bits/stl_algobase.h:62,
                 from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:39:
/usr/include/c++/14/ext/type_traits.h:164:35: error: 'constexpr const bool __gnu_cxx::__is_null_pointer' redeclared as different kind of entity
  164 |   __is_null_pointer(std::nullptr_t)
      |                                   ^
/usr/include/c++/14/ext/type_traits.h:159:5: note: previous declaration 'template<class _Type> constexpr bool __gnu_cxx::__is_null_pointer(_Type)'
  159 |     __is_null_pointer(_Type)
      |     ^~~~~~~~~~~~~~~~~
/usr/include/c++/14/ext/type_traits.h:164:26: error: 'nullptr_t' is not a member of 'std'; did you mean 'nullptr_t'?
  164 |   __is_null_pointer(std::nullptr_t)
      |                          ^~~~~~~~~
In file included from /usr/include/c++/14/cstddef:50,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:41:
/usr/lib/gcc/x86_64-linux-gnu/14/include/stddef.h:443:29: note: 'nullptr_t' declared here
  443 |   typedef decltype(nullptr) nullptr_t;
      |                             ^~~~~~~~~
In file included from /usr/include/c++/14/bits/stl_pair.h:60,
                 from /usr/include/c++/14/bits/stl_algobase.h:64:
/usr/include/c++/14/type_traits:666:33: error: 'nullptr_t' is not a member of 'std'; did you mean 'nullptr_t'?
  666 |     struct is_null_pointer<std::nullptr_t>
      |                                 ^~~~~~~~~
/usr/lib/gcc/x86_64-linux-gnu/14/include/stddef.h:443:29: note: 'nullptr_t' declared here
  443 |   typedef decltype(nullptr) nullptr_t;
      |                             ^~~~~~~~~
/usr/include/c++/14/type_traits:666:42: error: template argument 1 is invalid
  666 |     struct is_null_pointer<std::nullptr_t>
      |                                          ^
/usr/include/c++/14/type_traits:670:48: error: template argument 1 is invalid
  670 |     struct is_null_pointer<const std::nullptr_t>
      |                                                ^
/usr/include/c++/14/type_traits:674:51: error: template argument 1 is invalid
  674 |     struct is_null_pointer<volatile std::nullptr_t>
      |                                                   ^
/usr/include/c++/14/type_traits:678:57: error: template argument 1 is invalid
  678 |     struct is_null_pointer<const volatile std::nullptr_t>
      |                                                         ^
/usr/include/c++/14/type_traits:1429:37: error: 'size_t' is not a member of 'std'; did you mean 'size_t'?
 1429 |     : public integral_constant<std::size_t, alignof(_Tp)>
      |                                     ^~~~~~
/usr/lib/gcc/x86_64-linux-gnu/14/include/stddef.h:214:23: note: 'size_t' declared here
  214 | typedef __SIZE_TYPE__ size_t;
      |                       ^~~~~~
/usr/include/c++/14/type_traits:1429:57: error: template argument 1 is invalid
 1429 |     : public integral_constant<std::size_t, alignof(_Tp)>
      |                                                         ^
/usr/include/c++/14/type_traits:1429:57: note: invalid template non-type parameter
/usr/include/c++/14/type_traits:1438:37: error: 'size_t' is not a member of 'std'; did you mean 'size_t'?
 1438 |     : public integral_constant<std::size_t, 0> { };
      |                                     ^~~~~~
/usr/lib/gcc/x86_64-linux-gnu/14/include/stddef.h:214:23: note: 'size_t' declared here
  214 | typedef __SIZE_TYPE__ size_t;
      |                       ^~~~~~
/usr/include/c++/14/type_traits:1438:46: error: template argument 1 is invalid
 1438 |     : public integral_constant<std::size_t, 0> { };
      |                                              ^
/usr/include/c++/14/type_traits:1438:46: note: invalid template non-type parameter
/usr/include/c++/14/type_traits:1440:26: error: 'std::size_t' has not been declared
 1440 |   template<typename _Tp, std::size_t _Size>
      |                          ^~~
/usr/include/c++/14/type_traits:1441:21: error: '_Size' was not declared in this scope
 1441 |     struct rank<_Tp[_Size]>
      |                     ^~~~~
/usr/include/c++/14/type_traits:1441:27: error: template argument 1 is invalid
 1441 |     struct rank<_Tp[_Size]>
      |                           ^
/usr/include/c++/14/type_traits:1442:37: error: 'size_t' is not a member of 'std'; did you mean 'size_t'?
 1442 |     : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
      |                                     ^~~~~~
/usr/lib/gcc/x86_64-linux-gnu/14/include/stddef.h:214:23: note: 'size_t' declared here
  214 | typedef __SIZE_TYPE__ size_t;
      |                       ^~~~~~
/usr/include/c++/14/type_traits:1442:65: error: template argument 1 is invalid
 1442 |     : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
      |                                                                 ^
/usr/include/c++/14/type_traits:1442:65: note: invalid template non-type parameter
/usr/include/c++/14/type_traits:1446:37: error: 'size_t' is not a member of 'std'; did you mean 'size_t'?
 1446 |     : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
      |                                     ^~~~~~
/usr/lib/gcc/x86_64-linux-gnu/14/include/stddef.h:214:23: note: 'size_t' declared here
  214 | typedef __SIZE_TYPE__ size_t;
      |                       ^~~~~~
/usr/include/c++/14/type_traits:1446:65: error: template argument 1 is invalid
 1446 |     : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
      |                                                                 ^
/usr/include/c++/14/type_traits:1446:65: note: invalid template non-type parameter
/usr/include/c++/14/type_traits:2086:26: error: 'std::size_t' has not been declared
 2086 |   template<typename _Tp, std::size_t _Size>
      |                          ^~~
/usr/include/c++/14/type_traits:2087:30: error: '_Size' was not declared in this scope
 2087 |     struct remove_extent<_Tp[_Size]>
      |                              ^~~~~
/usr/include/c++/14/type_traits:2087:36: error: template argument 1 is invalid
 2087 |     struct remove_extent<_Tp[_Size]>
      |                                    ^
/usr/include/c++/14/type_traits:2099:26: error: 'std::size_t' has not been declared
 2099 |   template<typename _Tp, std::size_t _Size>
      |                          ^~~
/usr/include/c++/14/type_traits:2100:35: error: '_Size' was not declared in this scope
 2100 |     struct remove_all_extents<_Tp[_Size]>
      |                                   ^~~~~
/usr/include/c++/14/type_traits:2100:41: error: template argument 1 i