Language: C++

#include<iostream>
#include<math.h>
#include<algorithm>
using namespace std;

int main(void){
	int n, q, sum=0;
	long S[10001], T[10001];
	
	/* input */
	
	std::cin >> n;
	for(int i=0; i<n; i++){
		std::cin >> S[i];
	}
	
	std::cin >> q;
	for(int i=0; i<q; i++){
		std::cin >> T[i];
		if( lower_bound(S[0], S[n-1], T[i])){
			sum++;
		}
	}
	
	cout << sum << "\n";
	
	return 0;
}



Compiler output:
In file included from /usr/include/c++/14/string:51,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algobase.h: In instantiation of '_ForwardIterator std::__lower_bound(_ForwardIterator, _ForwardIterator, const _Tp&, _Compare) [with _ForwardIterator = long int; _Tp = long int; _Compare = __gnu_cxx::__ops::_Iter_less_val]':
/usr/include/c++/14/bits/stl_algobase.h:1539:32:   required from '_ForwardIterator std::lower_bound(_ForwardIterator, _ForwardIterator, const _Tp&) [with _ForwardIterator = long int; _Tp = long int]'
 1539 |       return std::__lower_bound(__first, __last, __val,
      |              ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
 1540 |                                 __gnu_cxx::__ops::__iter_less_val());
      |                                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
a.cc:20:18:   required from here
   20 |                 if( lower_bound(S[0], S[n-1], T[i])){
      |                     ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:1495:9: error: no type named 'difference_type' in 'struct std::iterator_traits<long int>'
 1495 |         _DistanceType;
      |         ^~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:1497:42: error: no matching function for call to 'distance(long int&, long int&)'
 1497 |       _DistanceType __len = std::distance(__first, __last);
      |                             ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/string:47:
/usr/include/c++/14/bits/stl_iterator_base_funcs.h:148:5: note: candidate: 'template<class _InputIterator> constexpr typename std::iterator_traits< <template-parameter-1-1> >::difference_type std::distance(_InputIterator, _InputIterator)'
  148 |     distance(_InputIterator __first, _InputIterator __last)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator_base_funcs.h:148:5: note:   template argument deduction/substitution failed:
/usr/include/c++/14/bits/stl_iterator_base_funcs.h: In substitution of 'template<class _InputIterator> constexpr typename std::iterator_traits< <template-parameter-1-1> >::difference_type std::distance(_InputIterator, _InputIterator) [with _InputIterator = long int]':
/usr/include/c++/14/bits/stl_algobase.h:1497:42:   required from '_ForwardIterator std::__lower_bound(_ForwardIterator, _ForwardIterator, const _Tp&, _Compare) [with _ForwardIterator = long int; _Tp = long int; _Compare = __gnu_cxx::__ops::_Iter_less_val]'
 1497 |       _DistanceType __len = std::distance(__first, __last);
      |                             ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:1539:32:   required from '_ForwardIterator std::lower_bound(_ForwardIterator, _ForwardIterator, const _Tp&) [with _ForwardIterator = long int; _Tp = long int]'
 1539 |       return std::__lower_bound(__first, __last, __val,
      |              ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
 1540 |                                 __gnu_cxx::__ops::__iter_less_val());
      |                                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
a.cc:20:18:   required from here
   20 |                 if( lower_bound(S[0], S[n-1], T[i])){
      |                     ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_iterator_base_funcs.h:148:5: error: no type named 'difference_type' in 'struct std::iterator_traits<long int>'
  148 |     distance(_InputIterator __first, _InputIterator __last)
      |     ^~~~~~~~