Run ID 作者 问题 语言 测评结果 Time Memory 代码长度 提交时间
109936 范恒恺 09优惠活动 C++ Compile Error 0 MS 0 KB 283 2025-02-13 14:43:57

Tests(0/0):


Code:

#include<bits/stdc++.h> using namespace std; int main(){ char 'P','G','S'; int a;//定义商品价格 double b; cin>>b>>a; if(cin=='P'){ cout<<a/0.7; } if(cin=='G'){ cout<<a/0.8; } if(cin=='S'){ cout<<a/0.9; } if(cin==b){ cout<<a*1.0/0.95; } return 0; }


Run Info:

Main.cc: In function 'int main()':
Main.cc:4:6: error: expected unqualified-id before 'P'
 char 'P','G','S';
      ^
Main.cc:8:7: error: no match for 'operator==' (operand types are 'std::istream {aka std::basic_istream}' and 'char')
 if(cin=='P'){
       ^
Main.cc:8:7: note: candidate: operator==(int, int) 
Main.cc:8:7: note:   no known conversion for argument 1 from 'std::istream {aka std::basic_istream}' to 'int'
In file included from /usr/include/c++/5/iosfwd:40:0,
                 from /usr/include/c++/5/ios:38,
                 from /usr/include/c++/5/istream:38,
                 from /usr/include/c++/5/sstream:38,
                 from /usr/include/c++/5/complex:45,
                 from /usr/include/c++/5/ccomplex:38,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:52,
                 from Main.cc:1:
/usr/include/c++/5/bits/postypes.h:216:5: note: candidate: template bool std::operator==(const std::fpos<_StateT>&, const std::fpos<_StateT>&)
     operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
     ^
/usr/include/c++/5/bits/postypes.h:216:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::fpos<_StateT>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/bits/stl_algobase.h:64:0,
                 from /usr/include/c++/5/bits/char_traits.h:39,
                 from /usr/include/c++/5/ios:40,
                 from /usr/include/c++/5/istream:38,
                 from /usr/include/c++/5/sstream:38,
                 from /usr/include/c++/5/complex:45,
                 from /usr/include/c++/5/ccomplex:38,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:52,
                 from Main.cc:1:
/usr/include/c++/5/bits/stl_pair.h:214:5: note: candidate: template constexpr bool std::operator==(const std::pair<_T1, _T2>&, const std::pair<_T1, _T2>&)
     operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
     ^
/usr/include/c++/5/bits/stl_pair.h:214:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::pair<_T1, _T2>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/5/bits/char_traits.h:39,
                 from /usr/include/c++/5/ios:40,
                 from /usr/include/c++/5/istream:38,
                 from /usr/include/c++/5/sstream:38,
                 from /usr/include/c++/5/complex:45,
                 from /usr/include/c++/5/ccomplex:38,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:52,
                 from Main.cc:1:
/usr/include/c++/5/bits/stl_iterator.h:292:5: note: candidate: template bool std::operator==(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&)
     operator==(const reverse_iterator<_Iterator>& __x,
     ^
/usr/include/c++/5/bits/stl_iterator.h:292:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::reverse_iterator<_Iterator>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/5/bits/char_traits.h:39,
                 from /usr/include/c++/5/ios:40,
                 from /usr/include/c++/5/istream:38,
                 from /usr/include/c++/5/sstream:38,
                 from /usr/include/c++/5/complex:45,
                 from /usr/include/c++/5/ccomplex:38,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:52,
                 from Main.cc:1:
/usr/include/c++/5/bits/stl_iterator.h:342:5: note: candidate: template bool std::operator==(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)
     operator==(const reverse_iterator<_IteratorL>& __x,
     ^
/usr/include/c++/5/bits/stl_iterator.h:342:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::reverse_iterator<_Iterator>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/5/bits/char_traits.h:39,
                 from /usr/include/c++/5/ios:40,
                 from /usr/include/c++/5/istream:38,
                 from /usr/include/c++/5/sstream:38,
                 from /usr/include/c++/5/complex:45,
                 from /usr/include/c++/5/ccomplex:38,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:52,
                 from Main.cc:1:
/usr/include/c++/5/bits/stl_iterator.h:1065:5: note: candidate: template bool std::operator==(const std::move_iterator<_Iterator>&, const std::move_iterator<_IteratorR>&)
     operator==(const move_iterator<_IteratorL>& __x,
     ^
/usr/include/c++/5/bits/stl_iterator.h:1065:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::move_iterator<_Iterator>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/5/bits/char_traits.h:39,
                 from /usr/include/c++/5/ios:40,
                 from /usr/include/c++/5/istream:38,
                 from /usr/include/c++/5/sstream:38,
                 from /usr/include/c++/5/complex:45,
                 from /usr/include/c++/5/ccomplex:38,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:52,
                 from Main.cc:1:
/usr/include/c++/5/bits/stl_iterator.h:1071:5: note: candidate: template bool std::operator==(const std::move_iterator<_Iterator>&, const std::move_iterator<_Iterator>&)
     operator==(const move_iterator<_Iterator>& __x,
     ^
/usr/include/c++/5/bits/stl_iterator.h:1071:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::move_iterator<_Iterator>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/string:41:0,
                 from /usr/include/c++/5/bits/locale_classes.h:40,
                 from /usr/include/c++/5/bits/ios_base.h:41,
                 from /usr/include/c++/5/ios:42,
                 from /usr/include/c++/5/istream:38,
                 from /usr/include/c++/5/sstream:38,
                 from /usr/include/c++/5/complex:45,
                 from /usr/include/c++/5/ccomplex:38,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:52,
                 from Main.cc:1:
/usr/include/c++/5/bits/allocator.h:128:5: note: candidate: template bool std::operator==(const std::allocator<_CharT>&, const std::allocator<_T2>&)
     operator==(const allocator<_T1>&, const allocator<_T2>&)
     ^
/usr/include/c++/5/bits/allocator.h:128:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::allocator<_CharT>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/string:41:0,
                 from /usr/include/c++/5/bits/locale_classes.h:40,
                 from /usr/include/c++/5/bits/ios_base.h:41,
                 from /usr/include/c++/5/ios:42,
                 from /usr/include/c++/5/istream:38,
                 from /usr/include/c++/5/sstream:38,
                 from /usr/include/c++/5/complex:45,
                 from /usr/include/c++/5/ccomplex:38,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:52,
                 from Main.cc:1:
/usr/include/c++/5/bits/allocator.h:134:5: note: candidate: template bool std::operator==(const std::allocator<_CharT>&, const std::allocator<_CharT>&)
     operator==(const allocator<_Tp>&, const allocator<_Tp>&)
     ^
/usr/include/c++/5/bits/allocator.h:134:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::allocator<_CharT>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/string:52:0,
                 from /usr/include/c++/5/bits/locale_classes.h:40,
                 from /usr/include/c++/5/bits/ios_base.h:41,
                 from /usr/include/c++/5/ios:42,
                 from /usr/include/c++/5/istream:38,
                 from /usr/include/c++/5/sstream:38,
                 from /usr/include/c++/5/complex:45,
                 from /usr/include/c++/5/ccomplex:38,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:52,
                 from Main.cc:1:
/usr/include/c++/5/bits/basic_string.h:4904:5: note: candidate: template bool std::operator==(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)
     operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^
/usr/include/c++/5/bits/basic_string.h:4904:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/string:52:0,
                 from /usr/include/c++/5/bits/locale_classes.h:40,
                 from /usr/include/c++/5/bits/ios_base.h:41,
                 from /usr/include/c++/5/ios:42,
                 from /usr/include/c++/5/istream:38,
                 from /usr/include/c++/5/sstream:38,
                 from /usr/include/c++/5/complex:45,
                 from /usr/include/c++/5/ccomplex:38,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:52,
                 from Main.cc:1:
/usr/include/c++/5/bits/basic_string.h:4911:5: 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>&)
     operator==(const basic_string<_CharT>& __lhs,
     ^
/usr/include/c++/5/bits/basic_string.h:4911:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::__cxx11::basic_string<_CharT>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/string:52:0,
                 from /usr/include/c++/5/bits/locale_classes.h:40,
                 from /usr/include/c++/5/bits/ios_base.h:41,
                 from /usr/include/c++/5/ios:42,
                 from /usr/include/c++/5/istream:38,
                 from /usr/include/c++/5/sstream:38,
                 from /usr/include/c++/5/complex:45,
                 from /usr/include/c++/5/ccomplex:38,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:52,
                 from Main.cc:1:
/usr/include/c++/5/bits/basic_string.h:4925:5: note: candidate: template bool std::operator==(const _CharT*, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)
     operator==(const _CharT* __lhs,
     ^
/usr/include/c++/5/bits/basic_string.h:4925:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   mismatched types 'const _CharT*' and 'std::basic_istream'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/string:52:0,
                 from /usr/include/c++/5/bits/locale_classes.h:40,
                 from /usr/include/c++/5/bits/ios_base.h:41,
                 from /usr/include/c++/5/ios:42,
                 from /usr/include/c++/5/istream:38,
                 from /usr/include/c++/5/sstream:38,
                 from /usr/include/c++/5/complex:45,
                 from /usr/include/c++/5/ccomplex:38,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:52,
                 from Main.cc:1:
/usr/include/c++/5/bits/basic_string.h:4937:5: note: candidate: template bool std::operator==(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _CharT*)
     operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^
/usr/include/c++/5/bits/basic_string.h:4937:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/bits/ios_base.h:46:0,
                 from /usr/include/c++/5/ios:42,
                 from /usr/include/c++/5/istream:38,
                 from /usr/include/c++/5/sstream:38,
                 from /usr/include/c++/5/complex:45,
                 from /usr/include/c++/5/ccomplex:38,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:52,
                 from Main.cc:1:
/usr/include/c++/5/system_error:284:3: note: candidate: bool std::operator==(const std::error_code&, const std::error_code&)
   operator==(const error_code& __lhs, const error_code& __rhs) noexcept
   ^
/usr/include/c++/5/system_error:284:3: note:   no known conversion for argument 1 from 'std::istream {aka std::basic_istream}' to 'const std::error_code&'
/usr/include/c++/5/system_error:289:3: note: candidate: bool std::operator==(const std::error_code&, const std::error_condition&)
   operator==(const error_code& __lhs, const error_condition& __rhs) noexcept
   ^
/usr/include/c++/5/system_error:289:3: note:   no known conversion for argument 1 from 'std::istream {aka std::basic_istream}' to 'const std::error_code&'
/usr/include/c++/5/system_error:296:3: note: candidate: bool std::operator==(const std::error_condition&, const std::error_code&)
   operator==(const error_condition& __lhs, const error_code& __rhs) noexcept
   ^
/usr/include/c++/5/system_error:296:3: note:   no known conversion for argument 1 from 'std::istream {aka std::basic_istream}' to 'const std::error_condition&'
/usr/include/c++/5/system_error:303:3: note: candidate: bool std::operator==(const std::error_condition&, const std::error_condition&)
   operator==(const error_condition& __lhs,
   ^
/usr/include/c++/5/system_error:303:3: note:   no known conversion for argument 1 from 'std::istream {aka std::basic_istream}' to 'const std::error_condition&'
In file included from /usr/include/c++/5/bits/locale_facets.h:48:0,
                 from /usr/include/c++/5/bits/basic_ios.h:37,
                 from /usr/include/c++/5/ios:44,
                 from /usr/include/c++/5/istream:38,
                 from /usr/include/c++/5/sstream:38,
                 from /usr/include/c++/5/complex:45,
                 from /usr/include/c++/5/ccomplex:38,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:52,
                 from Main.cc:1:
/usr/include/c++/5/bits/streambuf_iterator.h:204:5: note: candidate: template bool std::operator==(const std::istreambuf_iterator<_CharT, _Traits>&, const std::istreambuf_iterator<_CharT, _Traits>&)
     operator==(const istreambuf_iterator<_CharT, _Traits>& __a,
     ^
/usr/include/c++/5/bits/streambuf_iterator.h:204:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::istreambuf_iterator<_CharT, _Traits>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/ccomplex:38:0,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:52,
                 from Main.cc:1:
/usr/include/c++/5/complex:458:5: note: candidate: template constexpr bool std::operator==(const std::complex<_Tp>&, const std::complex<_Tp>&)
     operator==(const complex<_Tp>& __x, const complex<_Tp>& __y)
     ^
/usr/include/c++/5/complex:458:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::complex<_Tp>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/ccomplex:38:0,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:52,
                 from Main.cc:1:
/usr/include/c++/5/complex:463:5: note: candidate: template constexpr bool std::operator==(const std::complex<_Tp>&, const _Tp&)
     operator==(const complex<_Tp>& __x, const _Tp& __y)
     ^
/usr/include/c++/5/complex:463:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::complex<_Tp>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/ccomplex:38:0,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:52,
                 from Main.cc:1:
/usr/include/c++/5/complex:468:5: note: candidate: template constexpr bool std::operator==(const _Tp&, const std::complex<_Tp>&)
     operator==(const _Tp& __x, const complex<_Tp>& __y)
     ^
/usr/include/c++/5/complex:468:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   mismatched types 'const std::complex<_Tp>' and 'char'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/vector:64:0,
                 from /usr/include/c++/5/bits/random.h:34,
                 from /usr/include/c++/5/random:49,
                 from /usr/include/c++/5/bits/stl_algo.h:66,
                 from /usr/include/c++/5/algorithm:62,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:64,
                 from Main.cc:1:
/usr/include/c++/5/bits/stl_vector.h:1511:5: note: candidate: template bool std::operator==(const std::vector<_Tp, _Alloc>&, const std::vector<_Tp, _Alloc>&)
     operator==(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
     ^
/usr/include/c++/5/bits/stl_vector.h:1511:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::vector<_Tp, _Alloc>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/random:51:0,
                 from /usr/include/c++/5/bits/stl_algo.h:66,
                 from /usr/include/c++/5/algorithm:62,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:64,
                 from Main.cc:1:
/usr/include/c++/5/bits/random.tcc:1878:5: note: candidate: template bool std::operator==(const std::normal_distribution<_RealType>&, const std::normal_distribution<_RealType>&)
     operator==(const std::normal_distribution<_RealType>& __d1,
     ^
/usr/include/c++/5/bits/random.tcc:1878:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::normal_distribution<_RealType>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/deque:64:0,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:67,
                 from Main.cc:1:
/usr/include/c++/5/bits/stl_deque.h:265:5: note: candidate: template bool std::operator==(const std::_Deque_iterator<_Tp, _Ref, _Ptr>&, const std::_Deque_iterator<_Tp, _Ref, _Ptr>&)
     operator==(const _Deque_iterator<_Tp, _Ref, _Ptr>& __x,
     ^
/usr/include/c++/5/bits/stl_deque.h:265:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::_Deque_iterator<_Tp, _Ref, _Ptr>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/deque:64:0,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:67,
                 from Main.cc:1:
/usr/include/c++/5/bits/stl_deque.h:272:5: note: candidate: template bool std::operator==(const std::_Deque_iterator<_Tp, _Ref, _Ptr>&, const std::_Deque_iterator<_Tp, _RefR, _PtrR>&)
     operator==(const _Deque_iterator<_Tp, _RefL, _PtrL>& __x,
     ^
/usr/include/c++/5/bits/stl_deque.h:272:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::_Deque_iterator<_Tp, _Ref, _Ptr>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/deque:64:0,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:67,
                 from Main.cc:1:
/usr/include/c++/5/bits/stl_deque.h:2220:5: note: candidate: template bool std::operator==(const std::deque<_Tp, _Alloc>&, const std::deque<_Tp, _Alloc>&)
     operator==(const deque<_Tp, _Alloc>& __x,
     ^
/usr/include/c++/5/bits/stl_deque.h:2220:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::deque<_Tp, _Alloc>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/tuple:39:0,
                 from /usr/include/c++/5/functional:55,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:70,
                 from Main.cc:1:
/usr/include/c++/5/array:240:5: note: candidate: template bool std::operator==(const std::array<_Tp, _Nm>&, const std::array<_Tp, _Nm>&)
     operator==(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
     ^
/usr/include/c++/5/array:240:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::array<_Tp, _Nm>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/functional:55:0,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:70,
                 from Main.cc:1:
/usr/include/c++/5/tuple:915:5: note: candidate: template constexpr bool std::operator==(const std::tuple<_Elements ...>&, const std::tuple<_Elements ...>&)
     operator==(const tuple<_TElements...>& __t,
     ^
/usr/include/c++/5/tuple:915:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::tuple<_Elements ...>'
 if(cin=='P'){
         ^
In file included from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:70:0,
                 from Main.cc:1:
/usr/include/c++/5/functional:2333:5: note: candidate: template bool std::operator==(const std::function<_Res(_ArgTypes ...)>&, std::nullptr_t)
     operator==(const function<_Res(_Args...)>& __f, nullptr_t) noexcept
     ^
/usr/include/c++/5/functional:2333:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::function<_Res(_ArgTypes ...)>'
 if(cin=='P'){
         ^
In file included from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:70:0,
                 from Main.cc:1:
/usr/include/c++/5/functional:2339:5: note: candidate: template bool std::operator==(std::nullptr_t, const std::function<_Res(_ArgTypes ...)>&)
     operator==(nullptr_t, const function<_Res(_Args...)>& __f) noexcept
     ^
/usr/include/c++/5/functional:2339:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   cannot convert 'std::cin' (type 'std::istream {aka std::basic_istream}') to type 'std::nullptr_t'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/bits/locale_conv.h:41:0,
                 from /usr/include/c++/5/locale:43,
                 from /usr/include/c++/5/iomanip:43,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:71,
                 from Main.cc:1:
/usr/include/c++/5/bits/unique_ptr.h:624:5: note: candidate: template bool std::operator==(const std::unique_ptr<_Tp, _Dp>&, const std::unique_ptr<_Up, _Ep>&)
     operator==(const unique_ptr<_Tp, _Dp>& __x,
     ^
/usr/include/c++/5/bits/unique_ptr.h:624:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::unique_ptr<_Tp, _Dp>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/bits/locale_conv.h:41:0,
                 from /usr/include/c++/5/locale:43,
                 from /usr/include/c++/5/iomanip:43,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:71,
                 from Main.cc:1:
/usr/include/c++/5/bits/unique_ptr.h:630:5: note: candidate: template bool std::operator==(const std::unique_ptr<_Tp, _Dp>&, std::nullptr_t)
     operator==(const unique_ptr<_Tp, _Dp>& __x, nullptr_t) noexcept
     ^
/usr/include/c++/5/bits/unique_ptr.h:630:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::unique_ptr<_Tp, _Dp>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/bits/locale_conv.h:41:0,
                 from /usr/include/c++/5/locale:43,
                 from /usr/include/c++/5/iomanip:43,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:71,
                 from Main.cc:1:
/usr/include/c++/5/bits/unique_ptr.h:635:5: note: candidate: template bool std::operator==(std::nullptr_t, const std::unique_ptr<_Tp, _Dp>&)
     operator==(nullptr_t, const unique_ptr<_Tp, _Dp>& __x) noexcept
     ^
/usr/include/c++/5/bits/unique_ptr.h:635:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   cannot convert 'std::cin' (type 'std::istream {aka std::basic_istream}') to type 'std::nullptr_t'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/iterator:66:0,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:76,
                 from Main.cc:1:
/usr/include/c++/5/bits/stream_iterator.h:130:5: note: candidate: template bool std::operator==(const std::istream_iterator<_Tp, _CharT, _Traits, _Dist>&, const std::istream_iterator<_Tp, _CharT, _Traits, _Dist>&)
     operator==(const istream_iterator<_Tp, _CharT, _Traits, _Dist>& __x,
     ^
/usr/include/c++/5/bits/stream_iterator.h:130:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::istream_iterator<_Tp, _CharT, _Traits, _Dist>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/list:63:0,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:78,
                 from Main.cc:1:
/usr/include/c++/5/bits/stl_list.h:285:5: note: candidate: template bool std::operator==(const std::_List_iterator<_Tp>&, const std::_List_const_iterator<_Val>&)
     operator==(const _List_iterator<_Val>& __x,
     ^
/usr/include/c++/5/bits/stl_list.h:285:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::_List_iterator<_Tp>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/list:63:0,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:78,
                 from Main.cc:1:
/usr/include/c++/5/bits/stl_list.h:1807:5: note: candidate: template bool std::operator==(const std::__cxx11::list<_Tp, _Alloc>&, const std::__cxx11::list<_Tp, _Alloc>&)
     operator==(const list<_Tp, _Alloc>& __x, const list<_Tp, _Alloc>& __y)
     ^
/usr/include/c++/5/bits/stl_list.h:1807:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::__cxx11::list<_Tp, _Alloc>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/map:60:0,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:80,
                 from Main.cc:1:
/usr/include/c++/5/bits/stl_tree.h:324:5: note: candidate: template bool std::operator==(const std::_Rb_tree_iterator<_Tp>&, const std::_Rb_tree_const_iterator<_Val>&)
     operator==(const _Rb_tree_iterator<_Val>& __x,
     ^
/usr/include/c++/5/bits/stl_tree.h:324:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::_Rb_tree_iterator<_Tp>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/map:60:0,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:80,
                 from Main.cc:1:
/usr/include/c++/5/bits/stl_tree.h:1273:5: note: candidate: template bool std::operator==(const std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>&, const std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>&)
     operator==(const _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>& __x,
     ^
/usr/include/c++/5/bits/stl_tree.h:1273:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/map:61:0,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:80,
                 from Main.cc:1:
/usr/include/c++/5/bits/stl_map.h:1073:5: note: candidate: template bool std::operator==(const std::map<_Key, _Tp, _Compare, _Alloc>&, const std::map<_Key, _Tp, _Compare, _Alloc>&)
     operator==(const map<_Key, _Tp, _Compare, _Alloc>& __x,
     ^
/usr/include/c++/5/bits/stl_map.h:1073:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::map<_Key, _Tp, _Compare, _Alloc>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/map:62:0,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:80,
                 from Main.cc:1:
/usr/include/c++/5/bits/stl_multimap.h:974:5: note: candidate: template bool std::operator==(const std::multimap<_Key, _Tp, _Compare, _Alloc>&, const std::multimap<_Key, _Tp, _Compare, _Alloc>&)
     operator==(const multimap<_Key, _Tp, _Compare, _Alloc>& __x,
     ^
/usr/include/c++/5/bits/stl_multimap.h:974:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::multimap<_Key, _Tp, _Compare, _Alloc>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/bits/shared_ptr.h:52:0,
                 from /usr/include/c++/5/memory:82,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:81,
                 from Main.cc:1:
/usr/include/c++/5/bits/shared_ptr_base.h:1183:5: note: candidate: template bool std::operator==(const std::__shared_ptr<_Tp1, _Lp>&, const std::__shared_ptr<_Tp2, _Lp>&)
     operator==(const __shared_ptr<_Tp1, _Lp>& __a,
     ^
/usr/include/c++/5/bits/shared_ptr_base.h:1183:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::__shared_ptr<_Tp1, _Lp>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/bits/shared_ptr.h:52:0,
                 from /usr/include/c++/5/memory:82,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:81,
                 from Main.cc:1:
/usr/include/c++/5/bits/shared_ptr_base.h:1189:5: note: candidate: template bool std::operator==(const std::__shared_ptr<_Tp, _Lp>&, std::nullptr_t)
     operator==(const __shared_ptr<_Tp, _Lp>& __a, nullptr_t) noexcept
     ^
/usr/include/c++/5/bits/shared_ptr_base.h:1189:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::__shared_ptr<_Tp, _Lp>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/bits/shared_ptr.h:52:0,
                 from /usr/include/c++/5/memory:82,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:81,
                 from Main.cc:1:
/usr/include/c++/5/bits/shared_ptr_base.h:1194:5: note: candidate: template bool std::operator==(std::nullptr_t, const std::__shared_ptr<_Tp, _Lp>&)
     operator==(nullptr_t, const __shared_ptr<_Tp, _Lp>& __a) noexcept
     ^
/usr/include/c++/5/bits/shared_ptr_base.h:1194:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   cannot convert 'std::cin' (type 'std::istream {aka std::basic_istream}') to type 'std::nullptr_t'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/memory:82:0,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:81,
                 from Main.cc:1:
/usr/include/c++/5/bits/shared_ptr.h:336:5: note: candidate: template bool std::operator==(const std::shared_ptr<_Tp1>&, const std::shared_ptr<_Tp2>&)
     operator==(const shared_ptr<_Tp1>& __a,
     ^
/usr/include/c++/5/bits/shared_ptr.h:336:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::shared_ptr<_Tp1>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/memory:82:0,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:81,
                 from Main.cc:1:
/usr/include/c++/5/bits/shared_ptr.h:342:5: note: candidate: template bool std::operator==(const std::shared_ptr<_Tp1>&, std::nullptr_t)
     operator==(const shared_ptr<_Tp>& __a, nullptr_t) noexcept
     ^
/usr/include/c++/5/bits/shared_ptr.h:342:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::shared_ptr<_Tp1>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/memory:82:0,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:81,
                 from Main.cc:1:
/usr/include/c++/5/bits/shared_ptr.h:347:5: note: candidate: template bool std::operator==(std::nullptr_t, const std::shared_ptr<_Tp1>&)
     operator==(nullptr_t, const shared_ptr<_Tp>& __a) noexcept
     ^
/usr/include/c++/5/bits/shared_ptr.h:347:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   cannot convert 'std::cin' (type 'std::istream {aka std::basic_istream}') to type 'std::nullptr_t'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/queue:64:0,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:85,
                 from Main.cc:1:
/usr/include/c++/5/bits/stl_queue.h:271:5: note: candidate: template bool std::operator==(const std::queue<_Tp, _Seq>&, const std::queue<_Tp, _Seq>&)
     operator==(const queue<_Tp, _Seq>& __x, const queue<_Tp, _Seq>& __y)
     ^
/usr/include/c++/5/bits/stl_queue.h:271:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::queue<_Tp, _Seq>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/set:61:0,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:86,
                 from Main.cc:1:
/usr/include/c++/5/bits/stl_set.h:842:5: note: candidate: template bool std::operator==(const std::set<_Key, _Compare, _Alloc>&, const std::set<_Key, _Compare, _Alloc>&)
     operator==(const set<_Key, _Compare, _Alloc>& __x,
     ^
/usr/include/c++/5/bits/stl_set.h:842:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::set<_Key, _Compare, _Alloc>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/set:62:0,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:86,
                 from Main.cc:1:
/usr/include/c++/5/bits/stl_multiset.h:825:5: note: candidate: template bool std::operator==(const std::multiset<_Key, _Compare, _Alloc>&, const std::multiset<_Key, _Compare, _Alloc>&)
     operator==(const multiset<_Key, _Compare, _Alloc>& __x,
     ^
/usr/include/c++/5/bits/stl_multiset.h:825:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::multiset<_Key, _Compare, _Alloc>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/stack:61:0,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:88,
                 from Main.cc:1:
/usr/include/c++/5/bits/stl_stack.h:246:5: note: candidate: template bool std::operator==(const std::stack<_Tp, _Seq>&, const std::stack<_Tp, _Seq>&)
     operator==(const stack<_Tp, _Seq>& __x, const stack<_Tp, _Seq>& __y)
     ^
/usr/include/c++/5/bits/stl_stack.h:246:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::stack<_Tp, _Seq>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/valarray:587:0,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:94,
                 from Main.cc:1:
/usr/include/c++/5/bits/valarray_after.h:414:5: note: candidate: template std::_Expr, typename std::__fun::result_type> std::operator==(const std::_Expr<_Dom1, typename _Dom1::value_type>&, const std::_Expr<_Dom2, typename _Dom2::value_type>&)
     _DEFINE_EXPR_BINARY_OPERATOR(==, __equal_to)
     ^
/usr/include/c++/5/bits/valarray_after.h:414:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
 if(cin=='P'){
         ^
In file included from /usr/include/c++/5/valarray:587:0,
                 from /usr/include/x86_64-linux-gnu/c++/5/bits/stdc++.h:94,
                 from Main.cc:1:
/usr/include/c++/5/bits/valarray_after.h:414:5: note: candidate: template std::_Expr, typename std::__fun::result_type> std::operator==(const std::_Expr<_Dom1, typename _Dom1::value_type>&, const typename _Dom::value_type&)
     _DEFINE_EXPR_BINARY_OPERATOR(==, __equal_to)
     ^
/usr/include/c++/5/bits/valarray_after.h:414:5: note:   template argument deduction/substitution failed:
Main.cc:8:9: note:   'std::istream {aka std::basic_istream}' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'