Language: C++

#include <iostream>
#include <array>
#include <vector>
#include <iomanip>
#include <string>
#include <cmath>
#include <algorithm>
#include <queue>
#include <map>
#include <set>
using namespace std;

typedef  pair<int,int> P;
typedef long long LL;

const LL  INF=1<<31;
const LL MOD=1000000007;



int main(){
     int sx,sy,tx,ty;
     cin>>sx>>sy>>tx>>ty;
     string ans;
     string u,d,l,r;
     for(int i=0;i<(tx-sx);++i){
           u.push_back('U');
           d.push_back('D');
     }
     for(int i=0;i<(ty-sy);++i){
          l.push_back('L');
          r.push_back('R');
     }
     ans+=u+r+d+l+'D'+r+'R'+u+'U'+'L'+'U'+l+'L'+d+'D'+r+'R'<<endl;

}

Compiler output:
a.cc: In function 'int main()':
a.cc:34:60: error: no match for 'operator<<' (operand types are 'std::__cxx11::basic_string<char>' and '<unresolved overloaded function type>')
   34 |      ans+=u+r+d+l+'D'+r+'R'+u+'U'+'L'+'U'+l+'L'+d+'D'+r+'R'<<endl;
      |           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~
In file included from /usr/include/c++/14/bits/basic_string.h:47,
                 from /usr/include/c++/14/string:54,
                 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,
                 from a.cc:1:
/usr/include/c++/14/string_view:763:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, basic_string_view<_CharT, _Traits>)'
  763 |     operator<<(basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:763:5: note:   template argument deduction/substitution failed:
a.cc:34:62: note:   'std::__cxx11::basic_string<char>' is not derived from 'std::basic_ostream<_CharT, _Traits>'
   34 |      ans+=u+r+d+l+'D'+r+'R'+u+'U'+'L'+'U'+l+'L'+d+'D'+r+'R'<<endl;
      |                                                              ^~~~
/usr/include/c++/14/bits/basic_string.h:4077:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 4077 |     operator<<(basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:4077:5: note:   template argument deduction/substitution failed:
a.cc:34:62: note:   'std::__cxx11::basic_string<char>' is not derived from 'std::basic_ostream<_CharT, _Traits>'
   34 |      ans+=u+r+d+l+'D'+r+'R'+u+'U'+'L'+'U'+l+'L'+d+'D'+r+'R'<<endl;
      |                                                              ^~~~
In file included from /usr/include/c++/14/bits/memory_resource.h:38,
                 from /usr/include/c++/14/string:68:
/usr/include/c++/14/cstddef:125:5: note: candidate: 'template<class _IntegerType> constexpr std::__byte_op_t<_IntegerType> std::operator<<(byte, _IntegerType)'
  125 |     operator<<(byte __b, _IntegerType __shift) noexcept
      |     ^~~~~~~~
/usr/include/c++/14/cstddef:125:5: note:   template argument deduction/substitution failed:
a.cc:34:62: note:   couldn't deduce template parameter '_IntegerType'
   34 |      ans+=u+r+d+l+'D'+r+'R'+u+'U'+'L'+'U'+l+'L'+d+'D'+r+'R'<<endl;
      |                                                              ^~~~
In file included from /usr/include/c++/14/bits/ios_base.h:46:
/usr/include/c++/14/system_error:339:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const error_code&)'
  339 |     operator<<(basic_ostream<_CharT, _Traits>& __os, const error_code& __e)
      |     ^~~~~~~~
/usr/include/c++/14/system_error:339:5: note:   template argument deduction/substitution failed:
a.cc:34:62: note:   'std::__cxx11::basic_string<char>' is not derived from 'std::basic_ostream<_CharT, _Traits>'
   34 |      ans+=u+r+d+l+'D'+r+'R'+u+'U'+'L'+'U'+l+'L'+d+'D'+r+'R'<<endl;
      |                                                              ^~~~
/usr/include/c++/14/ostream:563:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, _CharT)'
  563 |     operator<<(basic_ostream<_CharT, _Traits>& __out, _CharT __c)
      |     ^~~~~~~~
/usr/include/c++/14/ostream:563:5: note:   template argument deduction/substitution failed:
a.cc:34:62: note:   'std::__cxx11::basic_string<char>' is not derived from 'std::basic_ostream<_CharT, _Traits>'
   34 |      ans+=u+r+d+l+'D'+r+'R'+u+'U'+'L'+'U'+l+'L'+d+'D'+r+'R'<<endl;
      |                                                              ^~~~
/usr/include/c++/14/ostream:573:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, char)'
  573 |     operator<<(basic_ostream<_CharT, _Traits>& __out, char __c)
      |     ^~~~~~~~
/usr/include/c++/14/ostream:573:5: note:   template argument deduction/substitution failed:
a.cc:34:62: note:   'std::__cxx11::basic_string<char>' is not derived from 'std::basic_ostream<_CharT, _Traits>'
   34 |      ans+=u+r+d+l+'D'+r+'R'+u+'U'+'L'+'U'+l+'L'+d+'D'+r+'R'<<endl;
      |                                                              ^~~~
/usr/include/c++/14/ostream:579:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(basic_ostream<char, _Traits>&, char)'
  579 |     operator<<(basic_ostream<char, _Traits>& __out, char __c)
      |     ^~~~~~~~
/usr/include/c++/14/ostream:579:5: note:   template argument deduction/substitution failed:
a.cc:34:62: note:   'std::__cxx11::basic_string<char>' is not derived from 'std::basic_ostream<char, _Traits>'
   34 |      ans+=u+r+d+l+'D'+r+'R'+u+'U'+'L'+'U'+l+'L'+d+'D'+r+'R'<<endl;
      |                                                              ^~~~
/usr/include/c++/14/ostream:590:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(basic_ostream<char, _Traits>&, signed char)'
  590 |     operator<<(basic_ostream<char, _Traits>& __out, signed char __c)
      |     ^~~~~~~~
/usr/include/c++/14/ostream:590:5: note:   template argument deduction/substitution failed:
a.cc:34:62: note:   'std::__cxx11::basic_string<char>' is not derived from 'std::basic_ostream<char, _Traits>'
   34 |      ans+=u+r+d+l+'D'+r+'R'+u+'U'+'L'+'U'+l+'L'+d+'D'+r+'R'<<endl;
      |                                                              ^~~~
/usr/include/c++/14/ostream:595:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(basic_ostream<char, _Traits>&, unsigned char)'
  595 |     operator<<(basic_ostream<char, _Traits>& __out, unsigned char __c)
      |     ^~~~~~~~
/usr/include/c++/14/ostream:595:5: note:   template argument deduction/substitution failed:
a.cc:34:62: note:   'std::__cxx11::basic_string<char>' is not derived from 'std::basic_ostream<char, _Traits>'
   34 |      ans+=u+r+d+l+'D'+r+'R'+u+'U'+'L'+'U'+l+'L'+d+'D'+r+'R'<<endl;
      |                                                              ^~~~
/usr/include/c++/14/ostream:654:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const _CharT*)'
  654 |     operator<<(basic_ostream<_CharT, _Traits>& __out, const _CharT* __s)
      |     ^~~~~~~~
/usr/include/c++/14/ostream:654:5: note:   template argument deduction/substitution failed:
a.cc:34:62: note:   'std::__cxx11::basic_string<char>' is not derived from 'std::basic_ostream<_CharT, _Traits>'
   34 |      ans+=u+r+d+l+'D'+r+'R'+u+'U'+'L'+'U'+l+'L'+d+'D'+r+'R'<<endl;
      |                                                              ^~~~
In file included from /usr/include/c++/14/ostream:1022:
/usr/include/c++/14/bits/ostream.tcc:307:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const char*)'
  307 |     operator<<(basic_ostream<_CharT, _Traits>& __out, const char* __s)
      |     ^~~~~~~~
/usr/include/c++/14/bits/ostream.tcc:307:5: note:   template argument deduction/substitution failed:
a.cc:34:62: note:   'std::__cxx11::basic_string<char>' is not derived from 'std::basic_ostream<_CharT, _Traits>'
   34 |      ans+=u+r+d+l+'D'+r+'R'+u+'U'+'L'+'U'+l+'L'+d+'D'+r+'R'<<endl;
      |                                                              ^~~~
/usr/include/c++/14/ostream:671:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(basic_ostream<char, _Traits>&, const char*)'
  671 |     operator<<(basic_ostream<char, _Traits>& __out, const char* __s)
      |     ^~~~~~~~
/usr/include/c++/14/ostream:671:5: note:   template argument deduction/substitution failed:
a.cc:34:62: note:   'std::__cxx11::basic_string<char>' is not derived from 'std::basic_ostream<char, _Traits>'
   34 |      ans+=u+r+d+l+'D'+r+'R'+u+'U'+'L'+'U'+l+'L'+d+'D'+r+'R'<<endl;
      |                                                              ^~~~
/usr/include/c++/14/ostream:684:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(basic_ostream<char, _Traits>&, const signed char*)'
  684 |     operator<<(basic_ostream<char, _Traits>& __out, const signed char* __s)
      |     ^~~~~~~~
/usr/include/c++/14/ostream:684:5: note:   template argument deduction/substitution failed:
a.cc:34:62: note:   'std::__cxx11::basic_string<char>' is not derived from 'std::basic_ostream<char, _Traits>'
   34 |      ans+=u+r+d+l+'D'+r+'R'+u+'U'+'L'+'U'+l+'L'+d+'D'+r+'R'<<endl;
      |                                                              ^~~~
/usr/include/c++/14/ostream:689:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(basic_ostream<char, _Traits>&, const unsigned char*)'
  689 |     operator<<(basic_ostream<char, _Traits>& __out, const unsigned char* __s)
      |     ^~~~~~~~
/usr/include/c++/14/ostream:689:5: note:   template argument deduction/substitution failed:
a.cc:34:62: note:   'std::__cxx11::basic_string<char>' is not derived from 'std::basic_ostream<char, _Traits>'
   34 |      ans+=u+r+d+l+'D'+r+'R'+u+'U'+'L'+'U'+l+'L'+d+'D'+r+'R'<<endl;
      |                                                              ^~~~
/usr/include/c++/14/ostream:810:5: note: candidate: 'template<class _Ostream, class _Tp> _Ostream&& std::operator<<(_Ostream&&, const _Tp&)'
  810 |     operator<<(_Ostream&& __os, const _Tp& __x)
      |     ^~~~~~~~
/usr/include/c++/14/ostream:810:5: note:   template argument deduction/substitution faile