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View Compilation Error

0_0_20706499_29571.cpp: In function 'int main()':
0_0_20706499_29571.cpp:33:11: error: no match for 'operator==' (operand types are 'std::multiset<int>::iterator {aka std::_Rb_tree_const_iterator<int>}' and 'long long int')
      if(it==NULL||(*it-x)>y){
           ^
0_0_20706499_29571.cpp:33:11: note: candidates are:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/set:60:0,
                 from 0_0_20706499_29571.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_tree.h:311:7: note: bool std::_Rb_tree_const_iterator<_Tp>::operator==(const _Self&) const [with _Tp = int; std::_Rb_tree_const_iterator<_Tp>::_Self = std::_Rb_tree_const_iterator<int>]
       operator==(const _Self& __x) const _GLIBCXX_NOEXCEPT
       ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_tree.h:311:7: note:   no known conversion for argument 1 from 'long long int' to 'const _Self& {aka const std::_Rb_tree_const_iterator<int>&}'
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/iosfwd:40:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_20706499_29571.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/postypes.h:216:5: note: template<class _StateT> bool std::operator==(const std::fpos<_StateT>&, const std::fpos<_StateT>&)
     operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/postypes.h:216:5: note:   template argument deduction/substitution failed:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/stdint.h:32:0,
                 from GCC4.9.2/lib/gcc/x86_64-w64-mingw32/4.9.2/include/stdint.h:9,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/cstdint:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:380,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_20706499_29571.cpp:1:
0_0_20706499_29571.cpp:33:13: note:   'std::multiset<int>::iterator {aka std::_Rb_tree_const_iterator<int>}' is not derived from 'const std::fpos<_StateT>'
      if(it==NULL||(*it-x)>y){
             ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:64:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_20706499_29571.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_pair.h:214:5: note: template<class _T1, class _T2> 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)
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_pair.h:214:5: note:   template argument deduction/substitution failed:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/stdint.h:32:0,
                 from GCC4.9.2/lib/gcc/x86_64-w64-mingw32/4.9.2/include/stdint.h:9,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/cstdint:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:380,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_20706499_29571.cpp:1:
0_0_20706499_29571.cpp:33:13: note:   'std::multiset<int>::iterator {aka std::_Rb_tree_const_iterator<int>}' is not derived from 'const std::pair<_T1, _T2>'
      if(it==NULL||(*it-x)>y){
             ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:67:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_20706499_29571.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:292:5: note: template<class _Iterator> bool std::operator==(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&)
     operator==(const reverse_iterator<_Iterator>& __x,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:292:5: note:   template argument deduction/substitution failed:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/stdint.h:32:0,
                 from GCC4.9.2/lib/gcc/x86_64-w64-mingw32/4.9.2/include/stdint.h:9,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/cstdint:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:380,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_20706499_29571.cpp:1:
0_0_20706499_29571.cpp:33:13: note:   'std::multiset<int>::iterator {aka std::_Rb_tree_const_iterator<int>}' is not derived from 'const std::reverse_iterator<_Iterator>'
      if(it==NULL||(*it-x)>y){
             ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:67:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_20706499_29571.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:342:5: note: template<class _IteratorL, class _IteratorR> bool std::operator==(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)
     operator==(const reverse_iterator<_IteratorL>& __x,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:342:5: note:   template argument deduction/substitution failed:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/stdint.h:32:0,
                 from GCC4.9.2/lib/gcc/x86_64-w64-mingw32/4.9.2/include/stdint.h:9,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/cstdint:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:380,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_20706499_29571.cpp:1:
0_0_20706499_29571.cpp:33:13: note:   'std::multiset<int>::iterator {aka std::_Rb_tree_const_iterator<int>}' is not derived from 'const std::reverse_iterator<_Iterator>'
      if(it==NULL||(*it-x)>y){
             ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:67:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_20706499_29571.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:1048:5: note: template<class _IteratorL, class _IteratorR> bool std::operator==(const std::move_iterator<_Iterator>&, const std::move_iterator<_IteratorR>&)
     operator==(const move_iterator<_IteratorL>& __x,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:1048:5: note:   template argument deduction/substitution failed:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/stdint.h:32:0,
                 from GCC4.9.2/lib/gcc/x86_64-w64-mingw32/4.9.2/include/stdint.h:9,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/cstdint:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:380,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_20706499_29571.cpp:1:
0_0_


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