Language: C++

#include <bits/stdc++.h>
using namespace std;
int n,ans;
map<int,int> h;
int main()
{
	int i,x,y;
	cin>>n;
	for(i=0;i<n;i++)
	{
		cin>>x;
		++h[x];
	}
	for(auto j=h.begin();j!=h.end;++j)
	{
		x=j->first;
		y=j->second;
		if(y<x) ans+=y;
		if(y>x) ans+=y-x;
		
	}
	cout<<ans<<endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:31: error: no match for 'operator!=' (operand types are 'std::_Rb_tree_iterator<std::pair<const int, int> >' and '<unresolved overloaded function type>')
   14 |         for(auto j=h.begin();j!=h.end;++j)
      |                              ~^~~~~~~
      |                              |    |
      |                              |    <unresolved overloaded function type>
      |                              std::_Rb_tree_iterator<std::pair<const int, int> >
In file included from /usr/include/c++/14/regex:68,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:181,
                 from a.cc:1:
/usr/include/c++/14/bits/regex.h:1132:5: note: candidate: 'template<class _BiIter> bool std::__cxx11::operator!=(const sub_match<_BiIter>&, const sub_match<_BiIter>&)'
 1132 |     operator!=(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1132:5: note:   template argument deduction/substitution failed:
a.cc:14:35: note:   'std::_Rb_tree_iterator<std::pair<const int, int> >' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   14 |         for(auto j=h.begin();j!=h.end;++j)
      |                                   ^~~
/usr/include/c++/14/bits/regex.h:1212:5: note: candidate: 'template<class _Bi_iter, class _Ch_traits, class _Ch_alloc> bool std::__cxx11::operator!=(__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>&, const sub_match<_BiIter>&)'
 1212 |     operator!=(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1212:5: note:   template argument deduction/substitution failed:
a.cc:14:35: note:   'std::_Rb_tree_iterator<std::pair<const int, int> >' is not derived from 'std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>'
   14 |         for(auto j=h.begin();j!=h.end;++j)
      |                                   ^~~
/usr/include/c++/14/bits/regex.h:1305:5: note: candidate: 'template<class _Bi_iter, class _Ch_traits, class _Ch_alloc> bool std::__cxx11::operator!=(const sub_match<_BiIter>&, __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>&)'
 1305 |     operator!=(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1305:5: note:   template argument deduction/substitution failed:
a.cc:14:35: note:   'std::_Rb_tree_iterator<std::pair<const int, int> >' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   14 |         for(auto j=h.begin();j!=h.end;++j)
      |                                   ^~~
/usr/include/c++/14/bits/regex.h:1379:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator!=(const typename std::iterator_traits<_Iter>::value_type*, const sub_match<_BiIter>&)'
 1379 |     operator!=(typename iterator_traits<_Bi_iter>::value_type const* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1379:5: note:   template argument deduction/substitution failed:
a.cc:14:35: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'std::map<int, int>::const_iterator (std::map<int, int>::*)() const noexcept' {aka 'std::_Rb_tree<int, std::pair<const int, int>, std::_Select1st<std::pair<const int, int> >, std::less<int>, std::allocator<std::pair<const int, int> > >::const_iterator (std::map<int, int>::*)() const noexcept'}
   14 |         for(auto j=h.begin();j!=h.end;++j)
      |                                   ^~~
a.cc:14:35: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'std::map<int, int>::iterator (std::map<int, int>::*)() noexcept' {aka 'std::_Rb_tree<int, std::pair<const int, int>, std::_Select1st<std::pair<const int, int> >, std::less<int>, std::allocator<std::pair<const int, int> > >::iterator (std::map<int, int>::*)() noexcept'}
a.cc:14:35: note:   couldn't deduce template parameter '_Bi_iter'
/usr/include/c++/14/bits/regex.h:1473:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator!=(const sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type*)'
 1473 |     operator!=(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1473:5: note:   template argument deduction/substitution failed:
a.cc:14:35: note:   'std::_Rb_tree_iterator<std::pair<const int, int> >' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   14 |         for(auto j=h.begin();j!=h.end;++j)
      |                                   ^~~
/usr/include/c++/14/bits/regex.h:1547:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator!=(const typename std::iterator_traits<_Iter>::value_type&, const sub_match<_BiIter>&)'
 1547 |     operator!=(typename iterator_traits<_Bi_iter>::value_type const& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1547:5: note:   template argument deduction/substitution failed:
a.cc:14:35: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'std::map<int, int>::const_iterator (std::map<int, int>::*)() const noexcept' {aka 'std::_Rb_tree<int, std::pair<const int, int>, std::_Select1st<std::pair<const int, int> >, std::less<int>, std::allocator<std::pair<const int, int> > >::const_iterator (std::map<int, int>::*)() const noexcept'}
   14 |         for(auto j=h.begin();j!=h.end;++j)
      |                                   ^~~
a.cc:14:35: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'std::map<int, int>::iterator (std::map<int, int>::*)() noexcept' {aka 'std::_Rb_tree<int, std::pair<const int, int>, std::_Select1st<std::pair<const int, int> >, std::less<int>, std::allocator<std::pair<const int, int> > >::iterator (std::map<int, int>::*)() noexcept'}
a.cc:14:35: note:   couldn't deduce template parameter '_Bi_iter'
/usr/include/c++/14/bits/regex.h:1647:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator!=(const sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type&)'
 1647 |     operator!=(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1647:5: note:   template argument deduction/substitution failed:
a.cc:14:35: note:   'std::_Rb_tree_iterator<std::pair<const int, int> >' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   14 |         for(auto j=h.begin();j!=h.end;++j)
      |                                   ^~~
/usr/include/c++/14/bits/regex.h:2213:5: note: candidate: 'template<class _Bi_iter, class _Alloc> bool std::__cxx11::operator!=(const match_results<_BiIter, _Alloc>&, const match_results<_BiIter, _Alloc>&)'
 2213 |     operator!=(const match_results<_Bi_iter, _Alloc>& __m1,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:2213:5: note:   template argument deduction/substitution failed:
a.cc:14:35: note:   'std::_Rb_tree_iterator<std::pair<const int, int> >' is not derived from 'const std::__cxx11::match_results<_BiIter, _Alloc>'
   14 |         for(auto j=h.begin();j!=h.end;++j)
      |                                   ^~~
In file included from /usr/include/c++/14/bits/stl_algobase.h:64,
                 from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51:
/usr/include/c++/14/bits/stl_pair.h:1052:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator!=(const pair<_T1, _T2>&, const pair<_T1, _T2>&)'
 1052 |     operator!=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_pair.h:1052:5: note:   template argument deduction/substitution failed:
a.cc:14:35: note:   'std::_Rb_tree_iterator<std::pair<const int, int> >' is not derived from 'const std::pair<_T1, _T2>'
   14 |         for(auto j=h.begin();j!=h.end;++j)
      |                                   ^~~
In file included from /usr/include/c++/14/bits/stl_algobase.h:67:
/usr/include/c++/14/bits/stl_iterator.h:455:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator!=(const reverse_iterator<_Iterator>&, const reverse_iterator<_Iterator>&)'
  455 |     operator!=(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:455:5: note:   template argument deduction/substitution failed:
a.cc:14:35: note:   'std::_Rb_tree_iterator<std::pair<const int, int> >' is not derived from 'const std::reverse_iterator<_Iterator>'
   14 |         for(auto j=h.begin();j!=h.end;++j)
      |                                   ^~~
/usr/include/c++/14/bits/stl_iterator.h:500:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator!=(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
  500 |     operator!=(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:500:5: note:   template argument deduction/substitution failed:
a.cc:14:35: note:   'std::_Rb_tree_iterator<std::pair<const int, int> >' is not derived from 'const std::reverse_iterator<_Iterator>'
   14 |         for(auto j=h.begin();j!=h.end;++j)
      |                                   ^~~
/usr/include/c++/14/bits/stl_iterator.h:1686:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator!=(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)'
 1686 |     operator!=(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1686:5: note:   template argument deduction/substitution failed:
a.cc:14:35: note:   'std::_Rb_tree_iterator<std::pair<const int, int> >' is not derived from 'const std::move_iterator<_IteratorL>'
   14 |         for(auto j=h.begin();j!=h.end;++j)
      |                                   ^~~
/usr/include/c++/14/bits/stl_iterator.h:1753:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator!=(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)'
 1753 |     operator!=(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1753:5: note:   template argument deduction/substitution failed:
a.cc:14:35: note:   'std::_Rb_tree_iterator<std::pair<const int, int> >' is not derived fr