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View Compilation Error

0_0_38712994_13077.cpp: In member function 'node SegTree::Query(long long int, long long int, long long int, long long int, long long int)':
0_0_38712994_13077.cpp:117:39: error: no match for 'operator+' (operand types are 'node' and 'node')
  117 |                 if (L <= m) res = res + Query(L, R, l, m, lc(rt));
      |                                   ~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~~~~
      |                                   |          |
      |                                   node       node
In file included from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/ranges_base.h:37,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/ranges_util.h:34,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/tuple:44,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/hashtable_policy.h:34,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/hashtable.h:35,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/unordered_map.h:33,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/unordered_map:41,
                 from 0_0_38712994_13077.cpp:1:
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/stl_iterator.h:634:5: note: candidate: 'template<class _Iterator> constexpr std::reverse_iterator<_IteratorL> std::operator+(typename reverse_iterator<_IteratorL>::difference_type, const reverse_iterator<_IteratorL>&)'
  634 |     operator+(typename reverse_iterator<_Iterator>::difference_type __n,
      |     ^~~~~~~~
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/stl_iterator.h:634:5: note:   template argument deduction/substitution failed:
0_0_38712994_13077.cpp:117:65: note:   'node' is not derived from 'const std::reverse_iterator<_IteratorL>'
  117 |                 if (L <= m) res = res + Query(L, R, l, m, lc(rt));
      |                                                                 ^
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/stl_iterator.h:1808:5: note: candidate: 'template<class _Iterator> constexpr std::move_iterator<_IteratorL> std::operator+(typename move_iterator<_IteratorL>::difference_type, const move_iterator<_IteratorL>&)'
 1808 |     operator+(typename move_iterator<_Iterator>::difference_type __n,
      |     ^~~~~~~~
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/stl_iterator.h:1808:5: note:   template argument deduction/substitution failed:
0_0_38712994_13077.cpp:117:65: note:   'node' is not derived from 'const std::move_iterator<_IteratorL>'
  117 |                 if (L <= m) res = res + Query(L, R, l, m, lc(rt));
      |                                                                 ^
In file included from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/string:54,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/locale_classes.h:40,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/ios_base.h:41,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/ios:44,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/ostream:40,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/iostream:41,
                 from 0_0_38712994_13077.cpp:4:
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/basic_string.h:3552:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> constexpr std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3552 |     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/basic_string.h:3552:5: note:   template argument deduction/substitution failed:
0_0_38712994_13077.cpp:117:65: note:   'node' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
  117 |                 if (L <= m) res = res + Query(L, R, l, m, lc(rt));
      |                                                                 ^
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/basic_string.h:3570:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> constexpr std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const _CharT*, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3570 |     operator+(const _CharT* __lhs,
      |     ^~~~~~~~
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/basic_string.h:3570:5: note:   template argument deduction/substitution failed:
0_0_38712994_13077.cpp:117:65: note:   mismatched types 'const _CharT*' and 'node'
  117 |                 if (L <= m) res = res + Query(L, R, l, m, lc(rt));
      |                                                                 ^
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/basic_string.h:3589:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> constexpr std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(_CharT, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3589 |     operator+(_CharT __lhs, const basic_string<_CharT,_Traits,_Alloc>& __rhs)
      |     ^~~~~~~~
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/basic_string.h:3589:5: note:   template argument deduction/substitution failed:
0_0_38712994_13077.cpp:117:65: note:   'node' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
  117 |                 if (L <= m) res = res + Query(L, R, l, m, lc(rt));
      |                                                                 ^
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/basic_string.h:3606:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> constexpr std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const _CharT*)'
 3606 |     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/basic_string.h:3606:5: note:   template argument deduction/substitution failed:
0_0_38712994_13077.cpp:117:65: note:   'node' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
  117 |                 if (L <= m) res = res + Query(L, R, l, m, lc(rt));
      |                                                                 ^
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/basic_string.h:3624:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> constexpr std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, _CharT)'
 3624 |     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs, _CharT __rhs)
      |     ^~~~~~~~
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/basic_string.h:3624:5: note:   template argument deduction/substitution failed:
0_0_38712994_13077.cpp:117:65: note:   'node' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
  117 |                 if (L <= m) res = res + Query(L, R, l, m, lc(rt));
      |                                                                 ^
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/basic_string.h:3636:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> constexpr std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(__cxx11::basic_string<_CharT, _Traits, _Allocator>&&, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3636 |     operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
      |     ^~~~~~~~
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/basic_string.h:3636:5: note:   template argument deduction/substitution failed:
0_0_38712994_13077.cpp:117:65: note:   'node' is not derived from 'std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
  117 |                 if (L <= m) res = res + Query(L, R, l, m, lc(rt));
      |                                                                 ^
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/basic_string.h:3643:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> constexpr std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, __cxx11::basic_string<_CharT, _Traits, _Allocator>&&)'
 3643 |     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/basic_string.h:3643:5: note:   template argument deduction/substitution failed:
0_0_38712994_13077.cpp:117:65: note:   'node' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
  117 |                 if (L <= m) res = res + Query(L, R, l, m, lc(rt));
      |                                                                 ^
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/basic_string.h:3650:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> constexpr std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(__cxx11::basic_string<_CharT, _Traits, _Allocator>&&, __cxx11::basic_string<_CharT, _Traits, _Allocator>&&)'


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