Language: C++

#include<bits/stdc++.h>
using namespace std;
int n;
int l[10];
int req[5];
bool used[10];
bool choose[10];
vector<int> could;
int closest(int q){
	int *p=lower_bound(l+1,l+n+1,q);
	int l=*(p-1),r=*p;
	if(q-l<r-q){
		return l;
	}
	return r;
}
int closest2(int q){
	int *p=lower_bound(could.begin(),could.end(),q);
	int l=*(p-1),r=*p;
	if(q-l<r-q){
		return l;
	}
	return r;
}
int main()
{
	cin>>n>req[1]>>req[2]>>req[3];
	for(int i=1;i<=n;i++)
	   cin>>l[i];
	sort(l+1,l+n+1);
	int ans=0;
	int least[5];
	int leastid[5];
	memset(least,63,sizeof(least));
	memset(leastid,-1,sizeof(leastid));
	for(int i=1;i<=n;i++)
	{
		for(int j=1;j<=3;j++){
			if(req[j]<l[i]){
				int exde=l[i]-req[j];
				if(abs(l[i]+closest(exde)-req[j])>=exde){
				    least[j]=min(least[j],exde);
					if(least[j]==exde)
					   leastid[j]=i;
				}
			}
		}
	}
	for(int i=1;i<=3;i++)
	   if(leastid[i]>0)
	      used[leastid[i]]=true;
	vector<int> free;
	for(int i=1;i<=n;i++)
	   if(!used[i])
	      free.push_back(i);
	while(!choose[0]){
		totsum=lastsum;
		for(int i=free.size()-1;i>=0;i--){
			if(choose[i]){
			    choose[i]=false;
				totsum-=free[i];
			}
			else{
				totsum+=free[i];
				choose[i]=true;
				break;
			}
		}
		if(choose[0])
		   break;
		could.push_back(totsum);
		lastsum=totsum;
	}
	for(int i=1;i<=3;i++){
		if(least[i]>n){
			least[i]=abs(req[i]-closest2(req[i]));
		}
	}
	cout<<least[1]+least[2]+least[3];
	return 0;
}


Compiler output:
a.cc: In function 'int closest2(int)':
a.cc:18:27: error: cannot convert '__gnu_cxx::__normal_iterator<int*, std::vector<int> >' to 'int*' in initialization
   18 |         int *p=lower_bound(could.begin(),could.end(),q);
      |                ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                           |
      |                           __gnu_cxx::__normal_iterator<int*, std::vector<int> >
a.cc: In function 'int main()':
a.cc:27:15: error: no match for 'operator>' (operand types are 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} and 'int')
   27 |         cin>>n>req[1]>>req[2]>>req[3];
      |         ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
      |            |                 |
      |            |                 int
      |            std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}
a.cc:27:15: note: candidate: 'operator>(int, int)' (built-in)
   27 |         cin>>n>req[1]>>req[2]>>req[3];
      |         ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
a.cc:27:15: note:   no known conversion for argument 1 from 'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} to '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:1176:5: note: candidate: 'template<class _BiIter> bool std::__cxx11::operator>(const sub_match<_BiIter>&, const sub_match<_BiIter>&)'
 1176 |     operator>(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1176:5: note:   template argument deduction/substitution failed:
a.cc:27:37: note:   'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   27 |         cin>>n>req[1]>>req[2]>>req[3];
      |                                     ^
/usr/include/c++/14/bits/regex.h:1236:5: 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>&)'
 1236 |     operator>(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1236:5: note:   template argument deduction/substitution failed:
a.cc:27:37: note:   'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>'
   27 |         cin>>n>req[1]>>req[2]>>req[3];
      |                                     ^
/usr/include/c++/14/bits/regex.h:1329:5: 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>&)'
 1329 |     operator>(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1329:5: note:   template argument deduction/substitution failed:
a.cc:27:37: note:   'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   27 |         cin>>n>req[1]>>req[2]>>req[3];
      |                                     ^
/usr/include/c++/14/bits/regex.h:1403:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator>(const typename std::iterator_traits<_Iter>::value_type*, const sub_match<_BiIter>&)'
 1403 |     operator>(typename iterator_traits<_Bi_iter>::value_type const* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1403:5: note:   template argument deduction/substitution failed:
a.cc:27:37: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'int'
   27 |         cin>>n>req[1]>>req[2]>>req[3];
      |                                     ^
/usr/include/c++/14/bits/regex.h:1497:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator>(const sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type*)'
 1497 |     operator>(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1497:5: note:   template argument deduction/substitution failed:
a.cc:27:37: note:   'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   27 |         cin>>n>req[1]>>req[2]>>req[3];
      |                                     ^
/usr/include/c++/14/bits/regex.h:1573:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator>(const typename std::iterator_traits<_Iter>::value_type&, const sub_match<_BiIter>&)'
 1573 |     operator>(typename iterator_traits<_Bi_iter>::value_type const& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1573:5: note:   template argument deduction/substitution failed:
a.cc:27:37: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'int'
   27 |         cin>>n>req[1]>>req[2]>>req[3];
      |                                     ^
/usr/include/c++/14/bits/regex.h:1673:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator>(const sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type&)'
 1673 |     operator>(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1673:5: note:   template argument deduction/substitution failed:
a.cc:27:37: note:   'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   27 |         cin>>n>req[1]>>req[2]>>req[3];
      |                                     ^
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:1058:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator>(const pair<_T1, _T2>&, const pair<_T1, _T2>&)'
 1058 |     operator>(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_pair.h:1058:5: note:   template argument deduction/substitution failed:
a.cc:27:37: note:   'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'const std::pair<_T1, _T2>'
   27 |         cin>>n>req[1]>>req[2]>>req[3];
      |                                     ^
In file included from /usr/include/c++/14/bits/stl_algobase.h:67:
/usr/include/c++/14/bits/stl_iterator.h:462:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator>(const reverse_iterator<_Iterator>&, const reverse_iterator<_Iterator>&)'
  462 |     operator>(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:462:5: note:   template argument deduction/substitution failed:
a.cc:27:37: note:   'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'const std::reverse_iterator<_Iterator>'
   27 |         cin>>n>req[1]>>req[2]>>req[3];
      |                                     ^
/usr/include/c++/14/bits/stl_iterator.h:507:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator>(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
  507 |     operator>(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:507:5: note:   template argument deduction/substitution failed:
a.cc:27:37: note:   'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'const std::reverse_iterator<_Iterator>'
   27 |         cin>>n>req[1]>>req[2]>>req[3];
      |                                     ^
/usr/include/c++/14/bits/stl_iterator.h:1714:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator>(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)'
 1714 |     operator>(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1714:5: note:   template argument deduction/substitution failed:
a.cc:27:37: note:   'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'const std::move_iterator<_IteratorL>'
   27 |         cin>>n>req[1]>>req[2]>>req[3];
      |                                     ^
/usr/include/c++/14/bits/stl_iterator.h:1774:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator>(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)'
 1774 |     operator>(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1774:5: note:   template argument deduction/substitution failed:
a.cc:27:37: note:   'std::basic_istream<char>::__istream_type' {aka 'std::basic_istream<char>'} is not derived from 'const std::move_iterator<_IteratorL>'
   27 |         cin>>n>req[1]>>req[2]>>req[3];
      |                                     ^
In file included from /usr/include/c++/14/bits/basic_string.h:47,
                 from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52:
/usr/include/c++/14/string_view:695:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator>(basic_string_view<_CharT, _Traits>, basic_string_view<_CharT, _Traits>)'
  695 |     operator> (basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:695:5: note:   template argument deduction/substitution failed:
a.cc:27:37: note:   'std::basic_istream<char>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   27 |         cin>>n>req[1]>>req[2]>>req[3];
      |                                     ^
/usr/include/c++/14/string_view:702:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator>(basic_string_view<_CharT, _Traits>, __type_identity_t<basic_string_view<_CharT, _Traits> >)'
  702 |     operator> (basic_string_view<_CharT, _Traits