Language: C++

#include <iostream>

int main(){
  int a, b, c, d;
  cin >> a >> b >> c >> d;
  int dac = max(a-c, c-a);
  int dab = max(a-b, b-a);
  int dbc = max(b-c, c-b);
  if (dac <= d) cout << "Yes" << endl;
  else if (dab <= d && dbc <= b) cout << "Yes" << endl;
  else cout << "No" << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    5 |   cin >> a >> b >> c >> d;
      |   ^~~
      |   std::cin
In file included 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:6:13: error: 'max' was not declared in this scope; did you mean 'std::max'?
    6 |   int dac = max(a-c, c-a);
      |             ^~~
      |             std::max
In file included from /usr/include/c++/14/string:51,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41:
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: 'std::max' declared here
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
a.cc:9:17: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    9 |   if (dac <= d) cout << "Yes" << 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:9:34: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
    9 |   if (dac <= d) cout << "Yes" << endl;
      |                                  ^~~~
      |                                  std::endl
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
a.cc:10:34: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   10 |   else if (dab <= d && dbc <= b) cout << "Yes" << 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:10:51: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   10 |   else if (dab <= d && dbc <= b) cout << "Yes" << endl;
      |                                                   ^~~~
      |                                                   std::endl
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
a.cc:11:8: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   11 |   else cout << "No" << 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:11:24: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   11 |   else cout << "No" << endl;
      |                        ^~~~
      |                        std::endl
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~