提出 2525180c-713a-48ed-9509-10acdfe73592

コード

#include <bits/stdc++.h>
using namespace std;

int main()
{
    queue<int> A;
    int B,C,D;
    cin>>B;
    for(int i=0;i<B;i++){
        cin>>D;
        if(D=1)cin>C;

        if(D=1){
           A.push(C); 
        }
        else if(D=2){ S.unshift(C);
           
        }
        else if(D=3){ cout<<S.front()<<endl;
            A.pop();
            
        }
    }
}

結果

問題	点数	言語	結果	実行時間	メモリ
E - Q2	0	C++	WJ	0 ms	0 KiB

コンパイルエラー

Main.cpp: In function 'int main()':
Main.cpp:11:19: error: no match for 'operator>' (operand types are 'std::istream' {aka 'std::basic_istream<char>'} and 'int')
   11 |         if(D=1)cin>C;
      |                ~~~^~
      |                |   |
      |                |   int
      |                std::istream {aka std::basic_istream<char>}
In file included from /usr/include/c++/13/regex:68,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:181,
                 from Main.cpp:1:
/usr/include/c++/13/bits/regex.h:1288:5: note: candidate: 'template<class _Bi_iter, class _Ch_traits, class _Alloc> auto std::__cxx11::operator<=>(const sub_match<_BiIter>&, __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>&)' (reversed)
 1288 |     operator<=>(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/13/bits/regex.h:1288:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'int'
   11 |         if(D=1)cin>C;
      |                    ^
/usr/include/c++/13/bits/regex.h:1456:5: note: candidate: 'template<class _Bi_iter> auto std::__cxx11::operator<=>(const sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type*)' (reversed)
 1456 |     operator<=>(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/13/bits/regex.h:1456:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'int'
   11 |         if(D=1)cin>C;
      |                    ^
/usr/include/c++/13/bits/regex.h:1629:5: note: candidate: 'template<class _Bi_iter> auto std::__cxx11::operator<=>(const sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type&)' (reversed)
 1629 |     operator<=>(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/13/bits/regex.h:1629:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'int'
   11 |         if(D=1)cin>C;
      |                    ^
In file included from /usr/include/c++/13/bits/stl_algobase.h:67,
                 from /usr/include/c++/13/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:51:
/usr/include/c++/13/bits/stl_iterator.h:583:5: note: candidate: 'template<class _IteratorL, class _IteratorR>  requires  three_way_comparable_with<_IteratorR, _IteratorL, std::partial_ordering> constexpr std::compare_three_way_result_t<_IteratorL, _IteratorR> std::operator<=>(const reverse_iterator<_IteratorL>&, const reverse_iterator<_IteratorR>&)' (reversed)
  583 |     operator<=>(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/13/bits/stl_iterator.h:583:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   mismatched types 'const std::reverse_iterator<_IteratorL>' and 'int'
   11 |         if(D=1)cin>C;
      |                    ^
/usr/include/c++/13/bits/stl_iterator.h:1690:5: note: candidate: 'template<class _IteratorL, class _IteratorR>  requires  three_way_comparable_with<_IteratorR, _IteratorL, std::partial_ordering> constexpr std::compare_three_way_result_t<_IteratorL, _IteratorR> std::operator<=>(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)' (reversed)
 1690 |     operator<=>(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/13/bits/stl_iterator.h:1690:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   mismatched types 'const std::move_iterator<_IteratorL>' and 'int'
   11 |         if(D=1)cin>C;
      |                    ^
In file included from /usr/include/c++/13/bits/ranges_algo.h:36,
                 from /usr/include/c++/13/algorithm:63:
/usr/include/c++/13/optional:1287:5: note: candidate: 'template<class _Tp, class _Up>  requires  three_way_comparable_with<_Up, _Tp, std::partial_ordering> constexpr std::compare_three_way_result_t<_IteratorL, _IteratorR> std::operator<=>(const optional<_Tp>&, const optional<_Up>&)' (reversed)
 1287 |     operator<=>(const optional<_Tp>& __x, const optional<_Up>& __y)
      |     ^~~~~~~~
/usr/include/c++/13/optional:1287:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   mismatched types 'const std::optional<_Tp>' and 'int'
   11 |         if(D=1)cin>C;
      |                    ^
/usr/include/c++/13/optional:1302:5: note: candidate: 'template<class _Tp> constexpr std::strong_ordering std::operator<=>(const optional<_Tp>&, nullopt_t)' (reversed)
 1302 |     operator<=>(const optional<_Tp>& __x, nullopt_t) noexcept
      |     ^~~~~~~~
/usr/include/c++/13/optional:1302:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   mismatched types 'const std::optional<_Tp>' and 'int'
   11 |         if(D=1)cin>C;
      |                    ^
/usr/include/c++/13/optional:1439:5: note: candidate: 'template<class _Tp, class _Up>  requires !(__is_optional_v<_Up>) && (three_way_comparable_with<_Up, _Tp, std::partial_ordering>) constexpr std::compare_three_way_result_t<_IteratorL, _IteratorR> std::operator<=>(const optional<_Tp>&, const _Up&)' (reversed)
 1439 |     operator<=>(const optional<_Tp>& __x, const _Up& __v)
      |     ^~~~~~~~
/usr/include/c++/13/optional:1439:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   mismatched types 'const std::optional<_Tp>' and 'int'
   11 |         if(D=1)cin>C;
      |                    ^
In file included from /usr/include/c++/13/bits/basic_string.h:47,
                 from /usr/include/c++/13/string:54,
                 from /usr/include/c++/13/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:52:
/usr/include/c++/13/string_view:633:5: note: candidate: 'template<class _CharT, class _Traits> constexpr decltype (__char_traits_cmp_cat<_Traits>(0)) std::operator<=>(basic_string_view<_CharT, _Traits>, __type_identity_t<basic_string_view<_CharT, _Traits> >)' (reversed)
  633 |     operator<=>(basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/13/string_view:633:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   mismatched types 'std::basic_string_view<_CharT, _Traits>' and 'int'
   11 |         if(D=1)cin>C;
      |                    ^
/usr/include/c++/13/bits/basic_string.h:3760:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> constexpr decltype (__char_traits_cmp_cat<_Traits>(0)) std::operator<=>(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const _CharT*)' (reversed)
 3760 |     operator<=>(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/13/bits/basic_string.h:3760:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   mismatched types 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>' and 'int'
   11 |         if(D=1)cin>C;
      |                    ^
In file included from /usr/include/c++/13/bits/uses_allocator_args.h:38,
                 from /usr/include/c++/13/bits/memory_resource.h:41,
                 from /usr/include/c++/13/string:58:
/usr/include/c++/13/tuple:1952:5: note: candidate: 'template<class ... _Tps, class ... _Ups> constexpr std::common_comparison_category_t<decltype (std::__detail::__synth3way(declval<_Tps&>(), declval<_Ups&>()))...> std::operator<=>(const tuple<_UTypes ...>&, const tuple<_UTypes ...>&)' (reversed)
 1952 |     operator<=>(const tuple<_Tps...>& __t, const tuple<_Ups...>& __u)
      |     ^~~~~~~~
/usr/include/c++/13/tuple:1952:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   mismatched types 'const std::tuple<_UTypes ...>' and 'int'
   11 |         if(D=1)cin>C;
      |                    ^
In file included from /usr/include/c++/13/memory:78,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:56:
/usr/include/c++/13/bits/unique_ptr.h:988:5: note: candidate: 'template<class _Tp, class _Dp, class _Up, class _Ep>  requires  three_way_comparable_with<typename std::unique_ptr<_Tp, _Dp>::pointer, typename std::unique_ptr<_Up, _Ep>::pointer, std::partial_ordering> constexpr std::compare_three_way_result_t<typename std::unique_ptr<_Tp, _Dp>::pointer, typename std::unique_ptr<_Up, _Ep>::pointer> std::operator<=>(const unique_ptr<_Tp, _Dp>&, const unique_ptr<_Up, _Ep>&)' (reversed)
  988 |     operator<=>(const unique_ptr<_Tp, _Dp>& __x,
      |     ^~~~~~~~
/usr/include/c++/13/bits/unique_ptr.h:988:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   mismatched types 'const std::unique_ptr<_Tp, _Dp>' and 'int'
   11 |         if(D=1)cin>C;
      |                    ^
/usr/include/c++/13/bits/unique_ptr.h:997:5: note: candidate: 'template<class _Tp, class _Dp>  requires  three_way_comparable<typename std::unique_ptr<_Tp, _Dp>::pointer, std::partial_ordering> constexpr std::compare_three_way_result_t<typename std::unique_ptr<_Tp, _Dp>::pointer> std::operator<=>(const unique_ptr<_Tp, _Dp>&, nullptr_t)' (reversed)
  997 |     operator<=>(const unique_ptr<_Tp, _Dp>& __x, nullptr_t)
      |     ^~~~~~~~
/usr/include/c++/13/bits/unique_ptr.h:997:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   mismatched types 'const std::unique_ptr<_Tp, _Dp>' and 'int'
   11 |         if(D=1)cin>C;
      |                    ^
In file included from /usr/include/c++/13/bits/shared_ptr.h:53,
                 from /usr/include/c++/13/memory:80:
/usr/include/c++/13/bits/shared_ptr_base.h:1805:5: note: candidate: 'template<class _Tp, class _Up, __gnu_cxx::_Lock_policy _Lp> std::strong_ordering std::operator<=>(const __shared_ptr<_Tp1, _Lp>&, const __shared_ptr<_Tp2, _Lp>&)' (reversed)
 1805 |     operator<=>(const __shared_ptr<_Tp, _Lp>& __a,
      |     ^~~~~~~~
/usr/include/c++/13/bits/shared_ptr_base.h:1805:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   mismatched types 'const std::__shared_ptr<_Tp1, _Lp>' and 'int'
   11 |         if(D=1)cin>C;
      |                    ^
/usr/include/c++/13/bits/shared_ptr_base.h:1811:5: note: candidate: 'template<class _Tp, __gnu_cxx::_Lock_policy _Lp> std::strong_ordering std::operator<=>(const __shared_ptr<_Tp, _Lp>&, nullptr_t)' (reversed)
 1811 |     operator<=>(const __shared_ptr<_Tp, _Lp>& __a, nullptr_t) noexcept
      |     ^~~~~~~~
/usr/include/c++/13/bits/shared_ptr_base.h:1811:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   mismatched types 'const std::__shared_ptr<_Tp, _Lp>' and 'int'
   11 |         if(D=1)cin>C;
      |                    ^
/usr/include/c++/13/bits/shared_ptr.h:567:5: note: candidate: 'template<class _Tp, class _Up> std::strong_ordering std::operator<=>(const shared_ptr<_Tp>&, const shared_ptr<_Tp>&)' (reversed)
  567 |     operator<=>(const shared_ptr<_Tp>& __a,
      |     ^~~~~~~~
/usr/include/c++/13/bits/shared_ptr.h:567:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   mismatched types 'const std::shared_ptr<_Tp>' and 'int'
   11 |         if(D=1)cin>C;
      |                    ^
/usr/include/c++/13/bits/shared_ptr.h:573:5: note: candidate: 'template<class _Tp> std::strong_ordering std::operator<=>(const shared_ptr<_Tp>&, nullptr_t)' (reversed)
  573 |     operator<=>(const shared_ptr<_Tp>& __a, nullptr_t) noexcept
      |     ^~~~~~~~
/usr/include/c++/13/bits/shared_ptr.h:573:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   mismatched types 'const std::shared_ptr<_Tp>' and 'int'
   11 |         if(D=1)cin>C;
      |                    ^
/usr/include/c++/13/bits/regex.h:1116:5: note: candidate: 'template<class _BiIter> auto std::__cxx11::operator<=>(const sub_match<_BiIter>&, const sub_match<_BiIter>&)' (rewritten)
 1116 |     operator<=>(const sub_match<_BiIter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/13/bits/regex.h:1116:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   11 |         if(D=1)cin>C;
      |                    ^
In file included from /usr/include/c++/13/bits/stl_algobase.h:64:
/usr/include/c++/13/bits/stl_pair.h:819:5: note: candidate: 'template<class _T1, class _T2> constexpr std::common_comparison_category_t<decltype (std::__detail::__synth3way(declval<_T1&>(), declval<_T1&>())), decltype (std::__detail::__synth3way(declval<_T2&>(), declval<_T2&>()))> std::operator<=>(const pair<_T1, _T2>&, const pair<_T1, _T2>&)' (rewritten)
  819 |     operator<=>(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/13/bits/stl_pair.h:819:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::pair<_T1, _T2>'
   11 |         if(D=1)cin>C;
      |                    ^
/usr/include/c++/13/bits/stl_iterator.h:601:5: note: candidate: 'template<class _Iterator>  requires  three_way_comparable<_Iterator, std::partial_ordering> constexpr std::compare_three_way_result_t<_Iterator, _Iterator> std::operator<=>(const reverse_iterator<_IteratorL>&, const reverse_iterator<_IteratorL>&)' (rewritten)
  601 |     operator<=>(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/13/bits/stl_iterator.h:601:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::reverse_iterator<_IteratorL>'
   11 |         if(D=1)cin>C;
      |                    ^
/usr/include/c++/13/bits/stl_iterator.h:1756:5: note: candidate: 'template<class _Iterator>  requires  three_way_comparable<_Iterator, std::partial_ordering> constexpr std::compare_three_way_result_t<_Iterator, _Iterator> std::operator<=>(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)' (rewritten)
 1756 |     operator<=>(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/13/bits/stl_iterator.h:1756:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::move_iterator<_IteratorL>'
   11 |         if(D=1)cin>C;
      |                    ^
/usr/include/c++/13/string_view:625:5: note: candidate: 'template<class _CharT, class _Traits> constexpr decltype (__char_traits_cmp_cat<_Traits>(0)) std::operator<=>(basic_string_view<_CharT, _Traits>, basic_string_view<_CharT, _Traits>)' (rewritten)
  625 |     operator<=>(basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/13/string_view:625:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   'std::basic_istream<char>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   11 |         if(D=1)cin>C;
      |                    ^
/usr/include/c++/13/bits/basic_string.h:3745:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> constexpr decltype (__char_traits_cmp_cat<_Traits>(0)) std::operator<=>(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)' (rewritten)
 3745 |     operator<=>(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/13/bits/basic_string.h:3745:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   11 |         if(D=1)cin>C;
      |                    ^
In file included from /usr/include/c++/13/vector:66,
                 from /usr/include/c++/13/functional:64,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:53:
/usr/include/c++/13/bits/stl_vector.h:2059:5: note: candidate: 'template<class _Tp, class _Alloc> constexpr std::__detail::__synth3way_t<_T1> std::operator<=>(const vector<_Tp, _Alloc>&, const vector<_Tp, _Alloc>&)' (rewritten)
 2059 |     operator<=>(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
      |     ^~~~~~~~
/usr/include/c++/13/bits/stl_vector.h:2059:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::vector<_Tp, _Alloc>'
   11 |         if(D=1)cin>C;
      |                    ^
In file included from /usr/include/c++/13/functional:65:
/usr/include/c++/13/array:304:5: note: candidate: 'template<class _Tp, long unsigned int _Nm> constexpr std::__detail::__synth3way_t<_T1> std::operator<=>(const array<_Tp, _Nm>&, const array<_Tp, _Nm>&)' (rewritten)
  304 |     operator<=>(const array<_Tp, _Nm>& __a, const array<_Tp, _Nm>& __b)
      |     ^~~~~~~~
/usr/include/c++/13/array:304:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::array<_Tp, _Nm>'
   11 |         if(D=1)cin>C;
      |                    ^
In file included from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:80:
/usr/include/c++/13/variant:1280:5: note: candidate: 'template<class ... _Types>  requires (three_way_comparable<_Types, std::partial_ordering> && ...) constexpr std::common_comparison_category_t<typename std::__detail::__cmp3way_res_impl<_Types, _Types>::type ...> std::operator<=>(const variant<_Types ...>&, const variant<_Types ...>&)' (rewritten)
 1280 |     operator<=>(const variant<_Types...>& __v, const variant<_Types...>& __w)
      |     ^~~~~~~~
/usr/include/c++/13/variant:1280:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::variant<_Types ...>'
   11 |         if(D=1)cin>C;
      |                    ^
In file included from /usr/include/c++/13/deque:66,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:139:
/usr/include/c++/13/bits/stl_deque.h:2309:5: note: candidate: 'template<class _Tp, class _Alloc> std::__detail::__synth3way_t<_T1> std::operator<=>(const deque<_Tp, _Alloc>&, const deque<_Tp, _Alloc>&)' (rewritten)
 2309 |     operator<=>(const deque<_Tp, _Alloc>& __x, const deque<_Tp, _Alloc>& __y)
      |     ^~~~~~~~
/usr/include/c++/13/bits/stl_deque.h:2309:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::deque<_Tp, _Alloc>'
   11 |         if(D=1)cin>C;
      |                    ^
In file included from /usr/include/c++/13/list:65,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:150:
/usr/include/c++/13/bits/stl_list.h:2159:5: note: candidate: 'template<class _Tp, class _Alloc> std::__detail::__synth3way_t<_T1> std::operator<=>(const __cxx11::list<_Tp, _Alloc>&, const __cxx11::list<_Tp, _Alloc>&)' (rewritten)
 2159 |     operator<=>(const list<_Tp, _Alloc>& __x, const list<_Tp, _Alloc>& __y)
      |     ^~~~~~~~
/usr/include/c++/13/bits/stl_list.h:2159:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::__cxx11::list<_Tp, _Alloc>'
   11 |         if(D=1)cin>C;
      |                    ^
In file included from /usr/include/c++/13/map:63,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:152:
/usr/include/c++/13/bits/stl_map.h:1534:5: note: candidate: 'template<class _Key, class _Tp, class _Compare, class _Alloc> std::__detail::__synth3way_t<std::pair<const _Key, _Val> > std::operator<=>(const map<_Key, _Tp, _Compare, _Allocator>&, const map<_Key, _Tp, _Compare, _Allocator>&)' (rewritten)
 1534 |     operator<=>(const map<_Key, _Tp, _Compare, _Alloc>& __x,
      |     ^~~~~~~~
/usr/include/c++/13/bits/stl_map.h:1534:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::map<_Key, _Tp, _Compare, _Allocator>'
   11 |         if(D=1)cin>C;
      |                    ^
In file included from /usr/include/c++/13/map:64:
/usr/include/c++/13/bits/stl_multimap.h:1155:5: note: candidate: 'template<class _Key, class _Tp, class _Compare, class _Alloc> std::__detail::__synth3way_t<std::pair<const _Key, _Val> > std::operator<=>(const multimap<_Key, _Tp, _Compare, _Allocator>&, const multimap<_Key, _Tp, _Compare, _Allocator>&)' (rewritten)
 1155 |     operator<=>(const multimap<_Key, _Tp, _Compare, _Alloc>& __x,
      |     ^~~~~~~~
/usr/include/c++/13/bits/stl_multimap.h:1155:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::multimap<_Key, _Tp, _Compare, _Allocator>'
   11 |         if(D=1)cin>C;
      |                    ^
In file included from /usr/include/c++/13/queue:66,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:157:
/usr/include/c++/13/bits/stl_queue.h:434:5: note: candidate: 'template<class _Tp, class _Seq>  requires  three_way_comparable<_Seq, std::partial_ordering> std::compare_three_way_result_t<_Seq> std::operator<=>(const queue<_Tp, _Seq>&, const queue<_Tp, _Seq>&)' (rewritten)
  434 |     operator<=>(const queue<_Tp, _Seq>& __x, const queue<_Tp, _Seq>& __y)
      |     ^~~~~~~~
/usr/include/c++/13/bits/stl_queue.h:434:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::queue<_Tp, _Seq>'
   11 |         if(D=1)cin>C;
      |                    ^
In file included from /usr/include/c++/13/set:63,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:158:
/usr/include/c++/13/bits/stl_set.h:1008:5: note: candidate: 'template<class _Key, class _Compare, class _Alloc> std::__detail::__synth3way_t<_T1> std::operator<=>(const set<_Key, _Compare, _Allocator>&, const set<_Key, _Compare, _Allocator>&)' (rewritten)
 1008 |     operator<=>(const set<_Key, _Compare, _Alloc>& __x,
      |     ^~~~~~~~
/usr/include/c++/13/bits/stl_set.h:1008:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::set<_Key, _Compare, _Allocator>'
   11 |         if(D=1)cin>C;
      |                    ^
In file included from /usr/include/c++/13/set:64:
/usr/include/c++/13/bits/stl_multiset.h:994:5: note: candidate: 'template<class _Key, class _Compare, class _Alloc> std::__detail::__synth3way_t<_T1> std::operator<=>(const multiset<_Key, _Compare, _Allocator>&, const multiset<_Key, _Compare, _Allocator>&)' (rewritten)
  994 |     operator<=>(const multiset<_Key, _Compare, _Alloc>& __x,
      |     ^~~~~~~~
/usr/include/c++/13/bits/stl_multiset.h:994:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::multiset<_Key, _Compare, _Allocator>'
   11 |         if(D=1)cin>C;
      |                    ^
In file included from /usr/include/c++/13/stack:63,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:160:
/usr/include/c++/13/bits/stl_stack.h:410:5: note: candidate: 'template<class _Tp, class _Seq>  requires  three_way_comparable<_Seq, std::partial_ordering> std::compare_three_way_result_t<_Seq> std::operator<=>(const stack<_Tp, _Seq>&, const stack<_Tp, _Seq>&)' (rewritten)
  410 |     operator<=>(const stack<_Tp, _Seq>& __x, const stack<_Tp, _Seq>& __y)
      |     ^~~~~~~~
/usr/include/c++/13/bits/stl_stack.h:410:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::stack<_Tp, _Seq>'
   11 |         if(D=1)cin>C;
      |                    ^
In file included from /usr/include/c++/13/forward_list:40,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:175:
/usr/include/c++/13/bits/forward_list.h:1473:5: note: candidate: 'template<class _Tp, class _Alloc> std::__detail::__synth3way_t<_T1> std::operator<=>(const forward_list<_Tp, _Alloc>&, const forward_list<_Tp, _Alloc>&)' (rewritten)
 1473 |     operator<=>(const forward_list<_Tp, _Alloc>& __x,
      |     ^~~~~~~~
/usr/include/c++/13/bits/forward_list.h:1473:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::forward_list<_Tp, _Alloc>'
   11 |         if(D=1)cin>C;
      |                    ^
In file included from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:99:
/usr/include/c++/13/coroutine:153:3: note: candidate: 'constexpr std::strong_ordering std::__n4861::operator<=>(coroutine_handle<void>, coroutine_handle<void>)' (rewritten)
  153 |   operator<=>(coroutine_handle<> __a, coroutine_handle<> __b) noexcept
      |   ^~~~~~~~
/usr/include/c++/13/coroutine:153:34: note:   no known conversion for argument 1 from 'std::istream' {aka 'std::basic_istream<char>'} to 'std::__n4861::coroutine_handle<void>'
  153 |   operator<=>(coroutine_handle<> __a, coroutine_handle<> __b) noexcept
      |               ~~~~~~~~~~~~~~~~~~~^~~
In file included from /usr/include/c++/13/bits/ios_base.h:46,
                 from /usr/include/c++/13/streambuf:43,
                 from /usr/include/c++/13/bits/streambuf_iterator.h:35,
                 from /usr/include/c++/13/iterator:66,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:54:
/usr/include/c++/13/system_error:316:3: note: candidate: 'std::strong_ordering std::operator<=>(const error_code&, const error_code&)' (rewritten)
  316 |   operator<=>(const error_code& __lhs, const error_code& __rhs) noexcept
      |   ^~~~~~~~
/usr/include/c++/13/system_error:316:33: note:   no known conversion for argument 1 from 'std::istream' {aka 'std::basic_istream<char>'} to 'const std::error_code&'
  316 |   operator<=>(const error_code& __lhs, const error_code& __rhs) noexcept
      |               ~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/13/system_error:498:3: note: candidate: 'std::strong_ordering std::operator<=>(const error_condition&, const error_condition&)' (rewritten)
  498 |   operator<=>(const error_condition& __lhs,
      |   ^~~~~~~~
/usr/include/c++/13/system_error:498:38: note:   no known conversion for argument 1 from 'std::istream' {aka 'std::basic_istream<char>'} to 'const std::error_condition&'
  498 |   operator<=>(const error_condition& __lhs,
      |               ~~~~~~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/13/variant:1303:3: note: candidate: 'constexpr std::strong_ordering std::operator<=>(monostate, monostate)' (rewritten)
 1303 |   operator<=>(monostate, monostate) noexcept { return strong_ordering::equal; }
      |   ^~~~~~~~
/usr/include/c++/13/variant:1303:15: note:   no known conversion for argument 1 from 'std::istream' {aka 'std::basic_istream<char>'} to 'std::monostate'
 1303 |   operator<=>(monostate, monostate) noexcept { return strong_ordering::equal; }
      |               ^~~~~~~~~
In file included from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:184:
/usr/include/c++/13/thread:67:3: note: candidate: 'std::strong_ordering std::operator<=>(thread::id, thread::id)' (rewritten)
   67 |   operator<=>(thread::id __x, thread::id __y) noexcept
      |   ^~~~~~~~
/usr/include/c++/13/thread:67:26: note:   no known conversion for argument 1 from 'std::istream' {aka 'std::basic_istream<char>'} to 'std::thread::id'
   67 |   operator<=>(thread::id __x, thread::id __y) noexcept
      |               ~~~~~~~~~~~^~~
Main.cpp:11:19: note: candidate: 'operator>(int, int)' (built-in)
   11 |         if(D=1)cin>C;
      |                ~~~^~
Main.cpp:11:19: note:   no known conversion for argument 1 from 'std::istream' {aka 'std::basic_istream<char>'} to 'int'
/usr/include/c++/13/bits/stl_iterator.h:558:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator>(const reverse_iterator<_IteratorL>&, const reverse_iterator<_IteratorR>&) requires requires{{std::operator>::__x->base() < std::operator>::__y->base()} -> decltype(auto) [requires std::convertible_to<<placeholder>, bool>];}'
  558 |     operator>(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/13/bits/stl_iterator.h:558:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::reverse_iterator<_IteratorL>'
   11 |         if(D=1)cin>C;
      |                    ^
/usr/include/c++/13/bits/stl_iterator.h:1725:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator>(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&) requires requires{{std::operator>::__y->base() < std::operator>::__x->base()} -> decltype(auto) [requires std::convertible_to<<placeholder>, bool>];}'
 1725 |     operator>(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/13/bits/stl_iterator.h:1725:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::move_iterator<_IteratorL>'
   11 |         if(D=1)cin>C;
      |                    ^
/usr/include/c++/13/optional:1262:5: note: candidate: 'template<class _Tp, class _Up> constexpr std::__optional_gt_t<_Tp, _Up> std::operator>(const optional<_Tp>&, const optional<_Up>&)'
 1262 |     operator>(const optional<_Tp>& __lhs, const optional<_Up>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/13/optional:1262:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::optional<_Tp>'
   11 |         if(D=1)cin>C;
      |                    ^
/usr/include/c++/13/optional:1400:5: note: candidate: 'template<class _Tp, class _Up> constexpr std::__optional_gt_t<_Tp, _Up> std::operator>(const optional<_Tp>&, const _Up&)'
 1400 |     operator>(const optional<_Tp>& __lhs, const _Up& __rhs)
      |     ^~~~~~~~
/usr/include/c++/13/optional:1400:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::optional<_Tp>'
   11 |         if(D=1)cin>C;
      |                    ^
/usr/include/c++/13/optional:1406:5: note: candidate: 'template<class _Tp, class _Up> constexpr std::__optional_gt_t<_Up, _Tp> std::operator>(const _Up&, const optional<_Tp>&)'
 1406 |     operator>(const _Up& __lhs, const optional<_Tp>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/13/optional:1406:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   mismatched types 'const std::optional<_Tp>' and 'int'
   11 |         if(D=1)cin>C;
      |                    ^
/usr/include/c++/13/bits/unique_ptr.h:934:5: note: candidate: 'template<class _Tp, class _Dp, class _Up, class _Ep> constexpr bool std::operator>(const unique_ptr<_Tp, _Dp>&, const unique_ptr<_Up, _Ep>&)'
  934 |     operator>(const unique_ptr<_Tp, _Dp>& __x,
      |     ^~~~~~~~
/usr/include/c++/13/bits/unique_ptr.h:934:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::unique_ptr<_Tp, _Dp>'
   11 |         if(D=1)cin>C;
      |                    ^
/usr/include/c++/13/bits/unique_ptr.h:942:5: note: candidate: 'template<class _Tp, class _Dp> constexpr bool std::operator>(const unique_ptr<_Tp, _Dp>&, nullptr_t)'
  942 |     operator>(const unique_ptr<_Tp, _Dp>& __x, nullptr_t)
      |     ^~~~~~~~
/usr/include/c++/13/bits/unique_ptr.h:942:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::unique_ptr<_Tp, _Dp>'
   11 |         if(D=1)cin>C;
      |                    ^
/usr/include/c++/13/bits/unique_ptr.h:952:5: note: candidate: 'template<class _Tp, class _Dp> constexpr bool std::operator>(nullptr_t, const unique_ptr<_Tp, _Dp>&)'
  952 |     operator>(nullptr_t, const unique_ptr<_Tp, _Dp>& __x)
      |     ^~~~~~~~
/usr/include/c++/13/bits/unique_ptr.h:952:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   mismatched types 'const std::unique_ptr<_Tp, _Dp>' and 'int'
   11 |         if(D=1)cin>C;
      |                    ^
/usr/include/c++/13/variant:1269:3: note: candidate: 'template<class ... _Types> constexpr bool std::operator>(const variant<_Types ...>&, const variant<_Types ...>&)'
 1269 |   _VARIANT_RELATION_FUNCTION_TEMPLATE(>, greater)
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/13/variant:1269:3: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::variant<_Types ...>'
   11 |         if(D=1)cin>C;
      |                    ^
/usr/include/c++/13/bits/stl_queue.h:413:5: note: candidate: 'template<class _Tp, class _Seq> bool std::operator>(const queue<_Tp, _Seq>&, const queue<_Tp, _Seq>&)'
  413 |     operator>(const queue<_Tp, _Seq>& __x, const queue<_Tp, _Seq>& __y)
      |     ^~~~~~~~
/usr/include/c++/13/bits/stl_queue.h:413:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::queue<_Tp, _Seq>'
   11 |         if(D=1)cin>C;
      |                    ^
/usr/include/c++/13/bits/stl_stack.h:389:5: note: candidate: 'template<class _Tp, class _Seq> bool std::operator>(const stack<_Tp, _Seq>&, const stack<_Tp, _Seq>&)'
  389 |     operator>(const stack<_Tp, _Seq>& __x, const stack<_Tp, _Seq>& __y)
      |     ^~~~~~~~
/usr/include/c++/13/bits/stl_stack.h:389:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::stack<_Tp, _Seq>'
   11 |         if(D=1)cin>C;
      |                    ^
In file included from /usr/include/c++/13/valarray:605,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:166:
/usr/include/c++/13/bits/valarray_after.h:420:5: note: candidate: 'template<class _Dom1, class _Dom2> std::_Expr<std::__detail::_BinClos<std::__greater, std::_Expr, std::_Expr, _Dom1, _Dom2>, typename std::__fun<std::__greater, typename _Dom1::value_type>::result_type> std::operator>(const _Expr<_Dom1, typename _Dom1::value_type>&, const _Expr<_Dom2, typename _Dom2::value_type>&)'
  420 |     _DEFINE_EXPR_BINARY_OPERATOR(>, struct std::__greater)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/13/bits/valarray_after.h:420:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   11 |         if(D=1)cin>C;
      |                    ^
/usr/include/c++/13/bits/valarray_after.h:420:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__greater, std::_Expr, std::_Constant, _Dom, typename _Dom::value_type>, typename std::__fun<std::__greater, typename _Dom1::value_type>::result_type> std::operator>(const _Expr<_Dom1, typename _Dom1::value_type>&, const typename _Dom::value_type&)'
  420 |     _DEFINE_EXPR_BINARY_OPERATOR(>, struct std::__greater)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/13/bits/valarray_after.h:420:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   11 |         if(D=1)cin>C;
      |                    ^
/usr/include/c++/13/bits/valarray_after.h:420:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__greater, std::_Constant, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__greater, typename _Dom1::value_type>::result_type> std::operator>(const typename _Dom::value_type&, const _Expr<_Dom1, typename _Dom1::value_type>&)'
  420 |     _DEFINE_EXPR_BINARY_OPERATOR(>, struct std::__greater)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/13/bits/valarray_after.h:420:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'int'
   11 |         if(D=1)cin>C;
      |                    ^
/usr/include/c++/13/bits/valarray_after.h:420:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__greater, std::_Expr, std::_ValArray, _Dom, typename _Dom::value_type>, typename std::__fun<std::__greater, typename _Dom1::value_type>::result_type> std::operator>(const _Expr<_Dom1, typename _Dom1::value_type>&, const valarray<typename _Dom::value_type>&)'
  420 |     _DEFINE_EXPR_BINARY_OPERATOR(>, struct std::__greater)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/13/bits/valarray_after.h:420:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   11 |         if(D=1)cin>C;
      |                    ^
/usr/include/c++/13/bits/valarray_after.h:420:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__greater, std::_ValArray, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__greater, typename _Dom1::value_type>::result_type> std::operator>(const valarray<typename _Dom::value_type>&, const _Expr<_Dom1, typename _Dom1::value_type>&)'
  420 |     _DEFINE_EXPR_BINARY_OPERATOR(>, struct std::__greater)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/13/bits/valarray_after.h:420:5: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'int'
   11 |         if(D=1)cin>C;
      |                    ^
/usr/include/c++/13/valarray:1211:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__greater, std::_ValArray, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__greater, _Tp>::result_type> std::operator>(const valarray<_Tp>&, const valarray<_Tp>&)'
 1211 | _DEFINE_BINARY_OPERATOR(>, __greater)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/13/valarray:1211:1: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::valarray<_Tp>'
   11 |         if(D=1)cin>C;
      |                    ^
/usr/include/c++/13/valarray:1211:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__greater, std::_ValArray, std::_Constant, _Tp, _Tp>, typename std::__fun<std::__greater, _Tp>::result_type> std::operator>(const valarray<_Tp>&, const typename valarray<_Tp>::value_type&)'
 1211 | _DEFINE_BINARY_OPERATOR(>, __greater)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/13/valarray:1211:1: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::valarray<_Tp>'
   11 |         if(D=1)cin>C;
      |                    ^
/usr/include/c++/13/valarray:1211:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__greater, std::_Constant, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__greater, _Tp>::result_type> std::operator>(const typename valarray<_Tp>::value_type&, const valarray<_Tp>&)'
 1211 | _DEFINE_BINARY_OPERATOR(>, __greater)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/13/valarray:1211:1: note:   template argument deduction/substitution failed:
Main.cpp:11:20: note:   mismatched types 'const std::valarray<_Tp>' and 'int'
   11 |         if(D=1)cin>C;
      |                    ^
Main.cpp:16:23: error: 'S' was not declared in this scope
   16 |         else if(D=2){ S.unshift(C);
      |                       ^
Main.cpp:19:29: error: 'S' was not declared in this scope
   19 |         else if(D=3){ cout<<S.front()<<endl;
      |                             ^