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Main.cc: In function ‘void solve()’: Main.cc:53:16: error: no match for ‘operator==’ (operand types are ‘std::set >’ and ‘int’) 53 | if(cur == 3) | ~~~ ^~ ~ | | | | | int | std::set > In file included from /usr/include/c++/11/regex:63, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:110, from Main.cc:1: /usr/include/c++/11/bits/regex.h:1059:5: note: candidate: ‘template bool std::__cxx11::operator==(const std::__cxx11::sub_match<_BiIter>&, const std::__cxx11::sub_match<_BiIter>&)’ 1059 | operator==(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs) | ^~~~~~~~ /usr/include/c++/11/bits/regex.h:1059:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: ‘std::set >’ is not derived from ‘const std::__cxx11::sub_match<_BiIter>’ 53 | if(cur == 3) | ^ In file included from /usr/include/c++/11/regex:63, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:110, from Main.cc:1: /usr/include/c++/11/bits/regex.h:1155:5: note: candidate: ‘template bool std::__cxx11::operator==(std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>&, const std::__cxx11::sub_match<_BiIter>&)’ 1155 | operator==(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs, | ^~~~~~~~ /usr/include/c++/11/bits/regex.h:1155:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: ‘std::set >’ is not derived from ‘std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>’ 53 | if(cur == 3) | ^ In file included from /usr/include/c++/11/regex:63, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:110, from Main.cc:1: /usr/include/c++/11/bits/regex.h:1230:5: note: candidate: ‘template bool std::__cxx11::operator==(const std::__cxx11::sub_match<_BiIter>&, std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>&)’ 1230 | operator==(const sub_match<_Bi_iter>& __lhs, | ^~~~~~~~ /usr/include/c++/11/bits/regex.h:1230:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: ‘std::set >’ is not derived from ‘const std::__cxx11::sub_match<_BiIter>’ 53 | if(cur == 3) | ^ In file included from /usr/include/c++/11/regex:63, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:110, from Main.cc:1: /usr/include/c++/11/bits/regex.h:1322:5: note: candidate: ‘template bool std::__cxx11::operator==(const typename std::iterator_traits<_Iter>::value_type*, const std::__cxx11::sub_match<_BiIter>&)’ 1322 | operator==(typename iterator_traits<_Bi_iter>::value_type const* __lhs, | ^~~~~~~~ /usr/include/c++/11/bits/regex.h:1322:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: mismatched types ‘const std::__cxx11::sub_match<_BiIter>’ and ‘int’ 53 | if(cur == 3) | ^ In file included from /usr/include/c++/11/regex:63, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:110, from Main.cc:1: /usr/include/c++/11/bits/regex.h:1397:5: note: candidate: ‘template bool std::__cxx11::operator==(const std::__cxx11::sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type*)’ 1397 | operator==(const sub_match<_Bi_iter>& __lhs, | ^~~~~~~~ /usr/include/c++/11/bits/regex.h:1397:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: ‘std::set >’ is not derived from ‘const std::__cxx11::sub_match<_BiIter>’ 53 | if(cur == 3) | ^ In file included from /usr/include/c++/11/regex:63, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:110, from Main.cc:1: /usr/include/c++/11/bits/regex.h:1490:5: note: candidate: ‘template bool std::__cxx11::operator==(const typename std::iterator_traits<_Iter>::value_type&, const std::__cxx11::sub_match<_BiIter>&)’ 1490 | operator==(typename iterator_traits<_Bi_iter>::value_type const& __lhs, | ^~~~~~~~ /usr/include/c++/11/bits/regex.h:1490:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: mismatched types ‘const std::__cxx11::sub_match<_BiIter>’ and ‘int’ 53 | if(cur == 3) | ^ In file included from /usr/include/c++/11/regex:63, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:110, from Main.cc:1: /usr/include/c++/11/bits/regex.h:1569:5: note: candidate: ‘template bool std::__cxx11::operator==(const std::__cxx11::sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type&)’ 1569 | operator==(const sub_match<_Bi_iter>& __lhs, | ^~~~~~~~ /usr/include/c++/11/bits/regex.h:1569:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: ‘std::set >’ is not derived from ‘const std::__cxx11::sub_match<_BiIter>’ 53 | if(cur == 3) | ^ In file included from /usr/include/c++/11/regex:63, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:110, from Main.cc:1: /usr/include/c++/11/bits/regex.h:2125:5: note: candidate: ‘template bool std::__cxx11::operator==(const std::__cxx11::match_results<_BiIter, _Alloc>&, const std::__cxx11::match_results<_BiIter, _Alloc>&)’ 2125 | operator==(const match_results<_Bi_iter, _Alloc>& __m1, | ^~~~~~~~ /usr/include/c++/11/bits/regex.h:2125:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: ‘std::set >’ is not derived from ‘const std::__cxx11::match_results<_BiIter, _Alloc>’ 53 | if(cur == 3) | ^ In file included from /usr/include/c++/11/iosfwd:40, from /usr/include/c++/11/ios:38, from /usr/include/c++/11/istream:38, from /usr/include/c++/11/sstream:38, from /usr/include/c++/11/complex:45, from /usr/include/c++/11/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:54, from Main.cc:1: /usr/include/c++/11/bits/postypes.h:222:5: note: candidate: ‘template bool std::operator==(const std::fpos<_StateT>&, const std::fpos<_StateT>&)’ 222 | operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs) | ^~~~~~~~ /usr/include/c++/11/bits/postypes.h:222:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: ‘std::set >’ is not derived from ‘const std::fpos<_StateT>’ 53 | if(cur == 3) | ^ In file included from /usr/include/c++/11/bits/stl_algobase.h:64, from /usr/include/c++/11/bits/char_traits.h:39, from /usr/include/c++/11/ios:40, from /usr/include/c++/11/istream:38, from /usr/include/c++/11/sstream:38, from /usr/include/c++/11/complex:45, from /usr/include/c++/11/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:54, from Main.cc:1: /usr/include/c++/11/bits/stl_pair.h:466:5: note: candidate: ‘template constexpr bool std::operator==(const std::pair<_T1, _T2>&, const std::pair<_T1, _T2>&)’ 466 | operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y) | ^~~~~~~~ /usr/include/c++/11/bits/stl_pair.h:466:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: ‘std::set >’ is not derived from ‘const std::pair<_T1, _T2>’ 53 | if(cur == 3) | ^ In file included from /usr/include/c++/11/bits/stl_algobase.h:67, from /usr/include/c++/11/bits/char_traits.h:39, from /usr/include/c++/11/ios:40, from /usr/include/c++/11/istream:38, from /usr/include/c++/11/sstream:38, from /usr/include/c++/11/complex:45, from /usr/include/c++/11/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:54, from Main.cc:1: /usr/include/c++/11/bits/stl_iterator.h:420:5: note: candidate: ‘template bool std::operator==(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&)’ 420 | operator==(const reverse_iterator<_Iterator>& __x, | ^~~~~~~~ /usr/include/c++/11/bits/stl_iterator.h:420:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: ‘std::set >’ is not derived from ‘const std::reverse_iterator<_Iterator>’ 53 | if(cur == 3) | ^ In file included from /usr/include/c++/11/bits/stl_algobase.h:67, from /usr/include/c++/11/bits/char_traits.h:39, from /usr/include/c++/11/ios:40, from /usr/include/c++/11/istream:38, from /usr/include/c++/11/sstream:38, from /usr/include/c++/11/complex:45, from /usr/include/c++/11/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:54, from Main.cc:1: /usr/include/c++/11/bits/stl_iterator.h:459:5: note: candidate: ‘template bool std::operator==(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)’ 459 | operator==(const reverse_iterator<_IteratorL>& __x, | ^~~~~~~~ /usr/include/c++/11/bits/stl_iterator.h:459:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: ‘std::set >’ is not derived from ‘const std::reverse_iterator<_Iterator>’ 53 | if(cur == 3) | ^ In file included from /usr/include/c++/11/bits/stl_algobase.h:67, from /usr/include/c++/11/bits/char_traits.h:39, from /usr/include/c++/11/ios:40, from /usr/include/c++/11/istream:38, from /usr/include/c++/11/sstream:38, from /usr/include/c++/11/complex:45, from /usr/include/c++/11/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:54, from Main.cc:1: /usr/include/c++/11/bits/stl_iterator.h:1585:5: note: candidate: ‘template bool std::operator==(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorR>&)’ 1585 | operator==(const move_iterator<_IteratorL>& __x, | ^~~~~~~~ /usr/include/c++/11/bits/stl_iterator.h:1585:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: ‘std::set >’ is not derived from ‘const std::move_iterator<_IteratorL>’ 53 | if(cur == 3) | ^ In file included from /usr/include/c++/11/bits/stl_algobase.h:67, from /usr/include/c++/11/bits/char_traits.h:39, from /usr/include/c++/11/ios:40, from /usr/include/c++/11/istream:38, from /usr/include/c++/11/sstream:38, from /usr/include/c++/11/complex:45, from /usr/include/c++/11/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:54, from Main.cc:1: /usr/include/c++/11/bits/stl_iterator.h:1648:5: note: candidate: ‘template bool std::operator==(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorL>&)’ 1648 | operator==(const move_iterator<_Iterator>& __x, | ^~~~~~~~ /usr/include/c++/11/bits/stl_iterator.h:1648:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: ‘std::set >’ is not derived from ‘const std::move_iterator<_IteratorL>’ 53 | if(cur == 3) | ^ In file included from /usr/include/c++/11/string:41, from /usr/include/c++/11/bits/locale_classes.h:40, from /usr/include/c++/11/bits/ios_base.h:41, from /usr/include/c++/11/ios:42, from /usr/include/c++/11/istream:38, from /usr/include/c++/11/sstream:38, from /usr/include/c++/11/complex:45, from /usr/include/c++/11/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:54, from Main.cc:1: /usr/include/c++/11/bits/allocator.h:218:5: note: candidate: ‘template bool std::operator==(const std::allocator<_CharT>&, const std::allocator<_T2>&)’ 218 | operator==(const allocator<_T1>&, const allocator<_T2>&) | ^~~~~~~~ /usr/include/c++/11/bits/allocator.h:218:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: ‘std::set >’ is not derived from ‘const std::allocator<_CharT>’ 53 | if(cur == 3) | ^ In file included from /usr/include/c++/11/string:55, from /usr/include/c++/11/bits/locale_classes.h:40, from /usr/include/c++/11/bits/ios_base.h:41, from /usr/include/c++/11/ios:42, from /usr/include/c++/11/istream:38, from /usr/include/c++/11/sstream:38, from /usr/include/c++/11/complex:45, from /usr/include/c++/11/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:54, from Main.cc:1: /usr/include/c++/11/bits/basic_string.h:6226:5: note: candidate: ‘template bool std::operator==(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)’ 6226 | operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs, | ^~~~~~~~ /usr/include/c++/11/bits/basic_string.h:6226:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: ‘std::set >’ is not derived from ‘const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’ 53 | if(cur == 3) | ^ In file included from /usr/include/c++/11/string:55, from /usr/include/c++/11/bits/locale_classes.h:40, from /usr/include/c++/11/bits/ios_base.h:41, from /usr/include/c++/11/ios:42, from /usr/include/c++/11/istream:38, from /usr/include/c++/11/sstream:38, from /usr/include/c++/11/complex:45, from /usr/include/c++/11/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:54, from Main.cc:1: /usr/include/c++/11/bits/basic_string.h:6234:5: note: candidate: ‘template typename __gnu_cxx::__enable_if::__value, bool>::__type std::operator==(const std::__cxx11::basic_string<_CharT>&, const std::__cxx11::basic_string<_CharT>&)’ 6234 | operator==(const basic_string<_CharT>& __lhs, | ^~~~~~~~ /usr/include/c++/11/bits/basic_string.h:6234:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: ‘std::set >’ is not derived from ‘const std::__cxx11::basic_string<_CharT>’ 53 | if(cur == 3) | ^ In file included from /usr/include/c++/11/string:55, from /usr/include/c++/11/bits/locale_classes.h:40, from /usr/include/c++/11/bits/ios_base.h:41, from /usr/include/c++/11/ios:42, from /usr/include/c++/11/istream:38, from /usr/include/c++/11/sstream:38, from /usr/include/c++/11/complex:45, from /usr/include/c++/11/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:54, from Main.cc:1: /usr/include/c++/11/bits/basic_string.h:6248:5: note: candidate: ‘template bool std::operator==(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _CharT*)’ 6248 | operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs, | ^~~~~~~~ /usr/include/c++/11/bits/basic_string.h:6248:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: ‘std::set >’ is not derived from ‘const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’ 53 | if(cur == 3) | ^ In file included from /usr/include/c++/11/string:55, from /usr/include/c++/11/bits/locale_classes.h:40, from /usr/include/c++/11/bits/ios_base.h:41, from /usr/include/c++/11/ios:42, from /usr/include/c++/11/istream:38, from /usr/include/c++/11/sstream:38, from /usr/include/c++/11/complex:45, from /usr/include/c++/11/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:54, from Main.cc:1: /usr/include/c++/11/bits/basic_string.h:6289:5: note: candidate: ‘template bool std::operator==(const _CharT*, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)’ 6289 | operator==(const _CharT* __lhs, | ^~~~~~~~ /usr/include/c++/11/bits/basic_string.h:6289:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: mismatched types ‘const _CharT*’ and ‘std::set >’ 53 | if(cur == 3) | ^ In file included from /usr/include/c++/11/bits/locale_facets.h:48, from /usr/include/c++/11/bits/basic_ios.h:37, from /usr/include/c++/11/ios:44, from /usr/include/c++/11/istream:38, from /usr/include/c++/11/sstream:38, from /usr/include/c++/11/complex:45, from /usr/include/c++/11/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:54, from Main.cc:1: /usr/include/c++/11/bits/streambuf_iterator.h:226:5: note: candidate: ‘template bool std::operator==(const std::istreambuf_iterator<_CharT, _Traits>&, const std::istreambuf_iterator<_CharT, _Traits>&)’ 226 | operator==(const istreambuf_iterator<_CharT, _Traits>& __a, | ^~~~~~~~ /usr/include/c++/11/bits/streambuf_iterator.h:226:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: ‘std::set >’ is not derived from ‘const std::istreambuf_iterator<_CharT, _Traits>’ 53 | if(cur == 3) | ^ In file included from /usr/include/c++/11/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:54, from Main.cc:1: /usr/include/c++/11/complex:464:5: note: candidate: ‘template constexpr bool std::operator==(const std::complex<_Tp>&, const std::complex<_Tp>&)’ 464 | operator==(const complex<_Tp>& __x, const complex<_Tp>& __y) | ^~~~~~~~ /usr/include/c++/11/complex:464:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: ‘std::set >’ is not derived from ‘const std::complex<_Tp>’ 53 | if(cur == 3) | ^ In file included from /usr/include/c++/11/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:54, from Main.cc:1: /usr/include/c++/11/complex:469:5: note: candidate: ‘template constexpr bool std::operator==(const std::complex<_Tp>&, const _Tp&)’ 469 | operator==(const complex<_Tp>& __x, const _Tp& __y) | ^~~~~~~~ /usr/include/c++/11/complex:469:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: ‘std::set >’ is not derived from ‘const std::complex<_Tp>’ 53 | if(cur == 3) | ^ In file included from /usr/include/c++/11/ccomplex:39, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:54, from Main.cc:1: /usr/include/c++/11/complex:475:5: note: candidate: ‘template constexpr bool std::operator==(const _Tp&, const std::complex<_Tp>&)’ 475 | operator==(const _Tp& __x, const complex<_Tp>& __y) | ^~~~~~~~ /usr/include/c++/11/complex:475:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: mismatched types ‘const std::complex<_Tp>’ and ‘int’ 53 | if(cur == 3) | ^ In file included from /usr/include/c++/11/deque:67, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:68, from Main.cc:1: /usr/include/c++/11/bits/stl_deque.h:2247:5: note: candidate: ‘template bool std::operator==(const std::deque<_Tp, _Alloc>&, const std::deque<_Tp, _Alloc>&)’ 2247 | operator==(const deque<_Tp, _Alloc>& __x, const deque<_Tp, _Alloc>& __y) | ^~~~~~~~ /usr/include/c++/11/bits/stl_deque.h:2247:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: ‘std::set >’ is not derived from ‘const std::deque<_Tp, _Alloc>’ 53 | if(cur == 3) | ^ In file included from /usr/include/c++/11/tuple:39, from /usr/include/c++/11/functional:54, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:71, from Main.cc:1: /usr/include/c++/11/array:276:5: note: candidate: ‘template bool std::operator==(const std::array<_Tp, _Nm>&, const std::array<_Tp, _Nm>&)’ 276 | operator==(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two) | ^~~~~~~~ /usr/include/c++/11/array:276:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: ‘std::set >’ is not derived from ‘const std::array<_Tp, _Nm>’ 53 | if(cur == 3) | ^ In file included from /usr/include/c++/11/functional:54, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:71, from Main.cc:1: /usr/include/c++/11/tuple:1524:5: note: candidate: ‘template constexpr bool std::operator==(const std::tuple<_Tps ...>&, const std::tuple<_Types ...>&)’ 1524 | operator==(const tuple<_TElements...>& __t, | ^~~~~~~~ /usr/include/c++/11/tuple:1524:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: ‘std::set >’ is not derived from ‘const std::tuple<_Tps ...>’ 53 | if(cur == 3) | ^ In file included from /usr/include/c++/11/functional:59, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:71, from Main.cc:1: /usr/include/c++/11/bits/std_function.h:718:5: note: candidate: ‘template bool std::operator==(const std::function<_Res(_ArgTypes ...)>&, std::nullptr_t)’ 718 | operator==(const function<_Res(_Args...)>& __f, nullptr_t) noexcept | ^~~~~~~~ /usr/include/c++/11/bits/std_function.h:718:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: ‘std::set >’ is not derived from ‘const std::function<_Res(_ArgTypes ...)>’ 53 | if(cur == 3) | ^ In file included from /usr/include/c++/11/functional:59, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:71, from Main.cc:1: /usr/include/c++/11/bits/std_function.h:725:5: note: candidate: ‘template bool std::operator==(std::nullptr_t, const std::function<_Res(_ArgTypes ...)>&)’ 725 | operator==(nullptr_t, const function<_Res(_Args...)>& __f) noexcept | ^~~~~~~~ /usr/include/c++/11/bits/std_function.h:725:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: mismatched types ‘const std::function<_Res(_ArgTypes ...)>’ and ‘int’ 53 | if(cur == 3) | ^ In file included from /usr/include/c++/11/bits/locale_conv.h:41, from /usr/include/c++/11/locale:43, from /usr/include/c++/11/iomanip:43, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:72, from Main.cc:1: /usr/include/c++/11/bits/unique_ptr.h:753:5: note: candidate: ‘template bool std::operator==(const std::unique_ptr<_Tp, _Dp>&, const std::unique_ptr<_Up, _Ep>&)’ 753 | operator==(const unique_ptr<_Tp, _Dp>& __x, | ^~~~~~~~ /usr/include/c++/11/bits/unique_ptr.h:753:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: ‘std::set >’ is not derived from ‘const std::unique_ptr<_Tp, _Dp>’ 53 | if(cur == 3) | ^ In file included from /usr/include/c++/11/bits/locale_conv.h:41, from /usr/include/c++/11/locale:43, from /usr/include/c++/11/iomanip:43, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:72, from Main.cc:1: /usr/include/c++/11/bits/unique_ptr.h:760:5: note: candidate: ‘template bool std::operator==(const std::unique_ptr<_Tp, _Dp>&, std::nullptr_t)’ 760 | operator==(const unique_ptr<_Tp, _Dp>& __x, nullptr_t) noexcept | ^~~~~~~~ /usr/include/c++/11/bits/unique_ptr.h:760:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: ‘std::set >’ is not derived from ‘const std::unique_ptr<_Tp, _Dp>’ 53 | if(cur == 3) | ^ In file included from /usr/include/c++/11/bits/locale_conv.h:41, from /usr/include/c++/11/locale:43, from /usr/include/c++/11/iomanip:43, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:72, from Main.cc:1: /usr/include/c++/11/bits/unique_ptr.h:767:5: note: candidate: ‘template bool std::operator==(std::nullptr_t, const std::unique_ptr<_Tp, _Dp>&)’ 767 | operator==(nullptr_t, const unique_ptr<_Tp, _Dp>& __x) noexcept | ^~~~~~~~ /usr/include/c++/11/bits/unique_ptr.h:767:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: mismatched types ‘const std::unique_ptr<_Tp, _Dp>’ and ‘int’ 53 | if(cur == 3) | ^ In file included from /usr/include/c++/11/list:63, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:79, from Main.cc:1: /usr/include/c++/11/bits/stl_list.h:2030:5: note: candidate: ‘template bool std::operator==(const std::__cxx11::list<_Tp, _Alloc>&, const std::__cxx11::list<_Tp, _Alloc>&)’ 2030 | operator==(const list<_Tp, _Alloc>& __x, const list<_Tp, _Alloc>& __y) | ^~~~~~~~ /usr/include/c++/11/bits/stl_list.h:2030:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: ‘std::set >’ is not derived from ‘const std::__cxx11::list<_Tp, _Alloc>’ 53 | if(cur == 3) | ^ In file included from /usr/include/c++/11/map:61, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:81, from Main.cc:1: /usr/include/c++/11/bits/stl_map.h:1463:5: note: candidate: ‘template bool std::operator==(const std::map<_Key, _Tp, _Compare, _Alloc>&, const std::map<_Key, _Tp, _Compare, _Alloc>&)’ 1463 | operator==(const map<_Key, _Tp, _Compare, _Alloc>& __x, | ^~~~~~~~ /usr/include/c++/11/bits/stl_map.h:1463:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: ‘std::set >’ is not derived from ‘const std::map<_Key, _Tp, _Compare, _Alloc>’ 53 | if(cur == 3) | ^ In file included from /usr/include/c++/11/map:62, from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:81, from Main.cc:1: /usr/include/c++/11/bits/stl_multimap.h:1128:5: note: candidate: ‘template bool std::operator==(const std::multimap<_Key, _Tp, _Compare, _Alloc>&, const std::multimap<_Key, _Tp, _Compare, _Alloc>&)’ 1128 | operator==(const multimap<_Key, _Tp, _Compare, _Alloc>& __x, | ^~~~~~~~ /usr/include/c++/11/bits/stl_multimap.h:1128:5: note: template argument deduction/substitution failed: Main.cc:53:19: note: ‘std::set >’ is not derived from ‘const std::multimap<_Key, _Tp, _Compare, _Alloc>’