Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  string s;
  cin >> s;
  string d[4]={"dream","dreamer","erase","eraser"};
  reverse(s.begin(),s.end());
  for(int i = 0; i < 4; ++i) reverse(d[i].begin(),d[i].end());
  bool can = true;
  for(int i = 0; i < s.size();){
    bool anko = false;
    for(int j = 0; j < 4; ++j){
      string t = d[j];
      if(s.substr(i,t.size()) = d){
        anko = true;
        i += d.size();
      }
    }
    if(!anko){
      can = false;
      break;
    }
  }
  if(can) cout << "YES" << endl;
  else cout << "NO" << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:33: error: no match for 'operator=' (operand types are 'std::__cxx11::basic_string<char>' and 'std::string [4]' {aka 'std::__cxx11::basic_string<char> [4]'})
   14 |       if(s.substr(i,t.size()) = d){
      |                                 ^
In file included from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52,
                 from a.cc:1:
/usr/include/c++/14/bits/basic_string.h:840:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::operator=(_CharT) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]' (near match)
  840 |       operator=(_CharT __c)
      |       ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:840:7: note:   conversion of argument 1 would be ill-formed:
a.cc:14:33: error: invalid conversion from 'std::string*' {aka 'std::__cxx11::basic_string<char>*'} to 'char' [-fpermissive]
   14 |       if(s.substr(i,t.size()) = d){
      |                                 ^
      |                                 |
      |                                 std::string* {aka std::__cxx11::basic_string<char>*}
/usr/include/c++/14/bits/basic_string.h:941:8: note: candidate: 'template<class _Tp> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::_If_sv<_Tp, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::operator=(const _Tp&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]'
  941 |        operator=(const _Tp& __svt)
      |        ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:941:8: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/14/bits/stl_pair.h:60,
                 from /usr/include/c++/14/bits/stl_algobase.h:64,
                 from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51:
/usr/include/c++/14/type_traits: In substitution of 'template<bool _Cond, class _Tp> using std::enable_if_t = typename std::enable_if::type [with bool _Cond = false; _Tp = std::__cxx11::basic_string<char>&]':
/usr/include/c++/14/bits/basic_string.h:149:8:   required by substitution of 'template<class _CharT, class _Traits, class _Alloc> template<class _Tp, class _Res> using std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::_If_sv = std::enable_if_t<((bool)std::__and_<std::is_convertible<const _Tp&, std::basic_string_view<_CharT, _Traits> >, std::__not_<std::is_convertible<const _Tp*, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>*> >, std::__not_<std::is_convertible<const _Tp&, const _CharT*> > >::value), _Res> [with _Tp = std::__cxx11::basic_string<char> [4]; _Res = std::__cxx11::basic_string<char>&; _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]'
  149 |         using _If_sv = enable_if_t<
      |               ^~~~~~
/usr/include/c++/14/bits/basic_string.h:941:8:   required by substitution of 'template<class _Tp> std::__cxx11::basic_string<char>::_If_sv<_Tp, std::__cxx11::basic_string<char>&> std::__cxx11::basic_string<char>::operator=(const _Tp&) [with _Tp = std::__cxx11::basic_string<char> [4]]'
  941 |        operator=(const _Tp& __svt)
      |        ^~~~~~~~
a.cc:14:33:   required from here
   14 |       if(s.substr(i,t.size()) = d){
      |                                 ^
/usr/include/c++/14/type_traits:2711:11: error: no type named 'type' in 'struct std::enable_if<false, std::__cxx11::basic_string<char>&>'
 2711 |     using enable_if_t = typename enable_if<_Cond, _Tp>::type;
      |           ^~~~~~~~~~~
/usr/include/c++/14/bits/basic_string.h:817:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::operator=(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]'
  817 |       operator=(const basic_string& __str)
      |       ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:817:37: note:   no known conversion for argument 1 from 'std::string [4]' {aka 'std::__cxx11::basic_string<char> [4]'} to 'const std::__cxx11::basic_string<char>&'
  817 |       operator=(const basic_string& __str)
      |                 ~~~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/14/bits/basic_string.h:828:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::operator=(const _CharT*) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]'
  828 |       operator=(const _CharT* __s)
      |       ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:828:31: note:   no known conversion for argument 1 from 'std::string [4]' {aka 'std::__cxx11::basic_string<char> [4]'} to 'const char*'
  828 |       operator=(const _CharT* __s)
      |                 ~~~~~~~~~~~~~~^~~
/usr/include/c++/14/bits/basic_string.h:858:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::operator=(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]'
  858 |       operator=(basic_string&& __str)
      |       ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:858:32: note:   no known conversion for argument 1 from 'std::string [4]' {aka 'std::__cxx11::basic_string<char> [4]'} to 'std::__cxx11::basic_string<char>&&'
  858 |       operator=(basic_string&& __str)
      |                 ~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/14/bits/basic_string.h:926:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::operator=(std::initializer_list<_Tp>) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]'
  926 |       operator=(initializer_list<_CharT> __l)
      |       ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:926:42: note:   no known conversion for argument 1 from 'std::string [4]' {aka 'std::__cxx11::basic_string<char> [4]'} to 'std::initializer_list<char>'
  926 |       operator=(initializer_list<_CharT> __l)
      |                 ~~~~~~~~~~~~~~~~~~~~~~~~~^~~
a.cc:16:16: error: request for member 'size' in 'd', which is of non-class type 'std::string [4]' {aka 'std::__cxx11::basic_string<char> [4]'}
   16 |         i += d.size();
      |                ^~~~