Language: C++

#include <bits/stdc++.h>

using namespace std;

#define REP(i, a, b) for (int i = a; i < b; i++)
#define rep(i, n) REP(i, 0, n)
#define all(x) (x).begin(), (x).end()

typedef long long ll;
typedef unsigned long long ull;

const string YES = "YES", NO = "NO";
string divide[4] = {"dream", "dreamer", "erase", "eraser"};

int main() {
    string S;
    cin >> S;
    reverse(all(S));
    rep(i, 4) { reverse(all(divide[i])); }
    bool canDivide = true;
    rep(i, S.size()) {
        bool canDivide4 = false;
        rep(j, 4) {
            string divstr = divide[j];
            if (S.substr(i, divstr.size()) == divstr) {
                i += divstr.size();
                canDivide4 = true;
            }
        }
        if (!canDivide4) {
            canDivide = false;
            break;
        }
    }

    cout << canDivide ? YES : NO << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:36:34: error: no match for 'operator<<' (operand types are 'const std::string' {aka 'const std::__cxx11::basic_string<char>'} and '<unresolved overloaded function type>')
   36 |     cout << canDivide ? YES : NO << endl;
      |                               ~~~^~~~~~~
In file included from /usr/include/c++/14/regex:68,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:181,
                 from a.cc:1:
/usr/include/c++/14/bits/regex.h:1715:5: note: candidate: 'template<class _Ch_type, class _Ch_traits, class _Bi_iter> std::basic_ostream<_CharT, _Traits>& std::__cxx11::operator<<(std::basic_ostream<_CharT, _Traits>&, const sub_match<_Bi_iter>&)'
 1715 |     operator<<(basic_ostream<_Ch_type, _Ch_traits>& __os,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1715:5: note:   template argument deduction/substitution failed:
a.cc:36:37: note:   types 'std::basic_ostream<_CharT, _Traits>' and 'const std::string' {aka 'const std::__cxx11::basic_string<char>'} have incompatible cv-qualifiers
   36 |     cout << canDivide ? YES : NO << endl;
      |                                     ^~~~
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:41:
/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:36:37: note:   couldn't deduce template parameter '_IntegerType'
   36 |     cout << canDivide ? YES : NO << 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/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52:
/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:36:37: note:   types 'std::basic_ostream<_CharT, _Traits>' and 'const std::string' {aka 'const std::__cxx11::basic_string<char>'} have incompatible cv-qualifiers
   36 |     cout << canDivide ? YES : NO << 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:36:37: note:   types 'std::basic_ostream<_CharT, _Traits>' and 'const std::string' {aka 'const std::__cxx11::basic_string<char>'} have incompatible cv-qualifiers
   36 |     cout << canDivide ? YES : NO << endl;
      |                                     ^~~~
/usr/include/c++/14/bitset:1687:5: note: candidate: 'template<class _CharT, class _Traits, long unsigned int _Nb> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const bitset<_Nb>&)'
 1687 |     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
      |     ^~~~~~~~
/usr/include/c++/14/bitset:1687:5: note:   template argument deduction/substitution failed:
a.cc:36:37: note:   types 'std::basic_ostream<_CharT, _Traits>' and 'const std::string' {aka 'const std::__cxx11::basic_string<char>'} have incompatible cv-qualifiers
   36 |     cout << canDivide ? YES : NO << endl;
      |                                     ^~~~
In file included from /usr/include/c++/14/bits/ios_base.h:46,
                 from /usr/include/c++/14/streambuf:43,
                 from /usr/include/c++/14/bits/streambuf_iterator.h:35,
                 from /usr/include/c++/14/iterator:66,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:54:
/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:36:37: note:   types 'std::basic_ostream<_CharT, _Traits>' and 'const std::string' {aka 'const std::__cxx11::basic_string<char>'} have incompatible cv-qualifiers
   36 |     cout << canDivide ? YES : NO << endl;
      |                                     ^~~~
In file included from /usr/include/c++/14/memory:80,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:56:
/usr/include/c++/14/bits/shared_ptr.h:70:5: note: candidate: 'template<class _Ch, class _Tr, class _Tp, __gnu_cxx::_Lock_policy _Lp> std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const __shared_ptr<_Tp, _Lp>&)'
   70 |     operator<<(std::basic_ostream<_Ch, _Tr>& __os,
      |     ^~~~~~~~
/usr/include/c++/14/bits/shared_ptr.h:70:5: note:   template argument deduction/substitution failed:
a.cc:36:37: note:   types 'std::basic_ostream<_CharT, _Traits>' and 'const std::string' {aka 'const std::__cxx11::basic_string<char>'} have incompatible cv-qualifiers
   36 |     cout << canDivide ? YES : NO << endl;
      |                                     ^~~~
In file included from /usr/include/c++/14/istream:41,
                 from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/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:36:37: note:   types 'std::basic_ostream<_CharT, _Traits>' and 'const std::string' {aka 'const std::__cxx11::basic_string<char>'} have incompatible cv-qualifiers
   36 |     cout << canDivide ? YES : NO << 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:36:37: note:   types 'std::basic_ostream<_CharT, _Traits>' and 'const std::string' {aka 'const std::__cxx11::basic_string<char>'} have incompatible cv-qualifiers
   36 |     cout << canDivide ? YES : NO << 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:36:37: note:   types 'std::basic_ostream<char, _Traits>' and 'const std::string' {aka 'const std::__cxx11::basic_string<char>'} have incompatible cv-qualifiers
   36 |     cout << canDivide ? YES : NO << 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:36:37: note:   types 'std::basic_ostream<char, _Traits>' and 'const std::string' {aka 'const std::__cxx11::basic_string<char>'} have incompatible cv-qualifiers
   36 |     cout << canDivide ? YES : NO << 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:36:37: note:   types 'std::basic_ostream<char, _Traits>' and 'const std::string' {aka 'const std::__cxx11::basic_string<char>'} have incompatible cv-qualifiers
   36 |     cout << canDivide ? YES : NO << 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:36:37: note:   types 'std::basic_ostream<_CharT, _Traits>' and 'const std::string' {aka 'const std::__cxx11::basic_string<char>'} have incompatible cv-qualifiers
   36 |     cout << canDivide ? YES : NO << 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_o