Language: C++

#include <iostream>
#include <algorithm>
#include <numeric>
#include <map>
#include <climits>

int main(void) {
  int N, M;
  std::cin >> N;
  
  std::map<std::string, int> map;
  for (int i = 0; i < N; i++) {
    std::string s;
    std::cin >> s;
    if (map.count(s)) {
      map[s]++;
    } else {
      map[s] = 1;
    }
  }

  for (int i = 0; i < M; i++) {
    std::string s;
    std::cin >> s;
    if (map.count(s)) {
      map[s]--;
    } else {
      map[s] = -1;
    }
  }

  int max = INT_MIN;
  for (auto& point : map) {
    if (point > max) {
      max = point;
    }
  }
  
  std::cout << max << std::endl;
  
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:34:15: error: no match for 'operator>' (operand types are 'std::pair<const std::__cxx11::basic_string<char>, int>' and 'int')
   34 |     if (point > max) {
      |         ~~~~~ ^ ~~~
      |         |       |
      |         |       int
      |         std::pair<const std::__cxx11::basic_string<char>, int>
In file included from /usr/include/c++/14/string:48,
                 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_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:34:17: note:   'std::pair<const std::__cxx11::basic_string<char>, int>' is not derived from 'const std::reverse_iterator<_Iterator>'
   34 |     if (point > max) {
      |                 ^~~
/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:34:17: note:   'std::pair<const std::__cxx11::basic_string<char>, int>' is not derived from 'const std::reverse_iterator<_Iterator>'
   34 |     if (point > max) {
      |                 ^~~
/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:34:17: note:   'std::pair<const std::__cxx11::basic_string<char>, int>' is not derived from 'const std::move_iterator<_IteratorL>'
   34 |     if (point > max) {
      |                 ^~~
/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:34:17: note:   'std::pair<const std::__cxx11::basic_string<char>, int>' is not derived from 'const std::move_iterator<_IteratorL>'
   34 |     if (point > max) {
      |                 ^~~
In file included from /usr/include/c++/14/bits/stl_algobase.h:64,
                 from /usr/include/c++/14/string: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:34:17: note:   mismatched types 'const std::pair<_T1, _T2>' and 'int'
   34 |     if (point > max) {
      |                 ^~~
In file included from /usr/include/c++/14/bits/basic_string.h:47,
                 from /usr/include/c++/14/string:54:
/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:34:17: note:   'std::pair<const std::__cxx11::basic_string<char>, int>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   34 |     if (point > max) {
      |                 ^~~
/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> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:702:5: note:   template argument deduction/substitution failed:
a.cc:34:17: note:   'std::pair<const std::__cxx11::basic_string<char>, int>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   34 |     if (point > max) {
      |                 ^~~
/usr/include/c++/14/string_view:710:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator>(__type_identity_t<basic_string_view<_CharT, _Traits> >, basic_string_view<_CharT, _Traits>)'
  710 |     operator> (__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:710:5: note:   template argument deduction/substitution failed:
a.cc:34:17: note:   mismatched types 'std::basic_string_view<_CharT, _Traits>' and 'int'
   34 |     if (point > max) {
      |                 ^~~
/usr/include/c++/14/bits/basic_string.h:3915:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator>(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3915 |     operator>(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3915:5: note:   template argument deduction/substitution failed:
a.cc:34:17: note:   'std::pair<const std::__cxx11::basic_string<char>, int>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   34 |     if (point > max) {
      |                 ^~~
/usr/include/c++/14/bits/basic_string.h:3929:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator>(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const _CharT*)'
 3929 |     operator>(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3929:5: note:   template argument deduction/substitution failed:
a.cc:34:17: note:   'std::pair<const std::__cxx11::basic_string<char>, int>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   34 |     if (point > max) {
      |                 ^~~
/usr/include/c++/14/bits/basic_string.h:3942:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator>(const _CharT*, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3942 |     operator>(const _CharT* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3942:5: note:   template argument deduction/substitution failed:
a.cc:34:17: note:   mismatched types 'const _CharT*' and 'std::pair<const std::__cxx11::basic_string<char>, int>'
   34 |     if (point > max) {
      |                 ^~~
In file included from /usr/include/c++/14/bits/memory_resource.h:47,
                 from /usr/include/c++/14/string:68:
/usr/include/c++/14/tuple:2619:5: note: candidate: 'template<class ... _TElements, class ... _UElements> constexpr bool std::operator>(const tuple<_UTypes ...>&, const tuple<_Elements ...>&)'
 2619 |     operator>(const tuple<_TElements...>& __t,
      |     ^~~~~~~~
/usr/include/c++/14/tuple:2619:5: note:   template argument deduction/substitution failed:
a.cc:34:17: note:   'std::pair<const std::__cxx11::basic_string<char>, int>' is not derived from 'const std::tuple<_UTypes ...>'
   34 |     if (point > max) {
      |                 ^~~
In file included from /usr/include/c++/14/map:63,
                 from a.cc:4:
/usr/include/c++/14/bits/stl_map.h:1564:5: note: candidate: 'template<class _Key, class _Tp, class _Compare, class _Alloc> bool std::operator>(const map<_Key, _Tp, _Compare, _Allocator>&, const map<_Key, _Tp, _Compare, _Allocator>&)'
 1564 |     operator>(const map<_Key, _Tp, _Compare, _Alloc>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_map.h:1564:5: note:   template argument deduction/substitution failed:
a.cc:34:17: note:   'std::pair<const std::__cxx11::basic_string<char>, int>' is not derived from 'const std::map<_Key, _Tp, _Compare, _Allocator>'
   34 |     if (point > max) {
      |                 ^~~
In file included from /usr/include/c++/14/map:64:
/usr/include/c++/14/bits/stl_multimap.h:1186:5: note: candidate: 'template<class _Key, class _Tp, class _Compare, class _Alloc> bool std::operator>(const multimap<_Key, _Tp, _Compare, _Allocator>&, const multimap<_Key, _Tp, _Compare, _Allocator>&)'
 1186 |     operator>(const multimap<_Key, _Tp, _Compare, _Alloc>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_multimap.h:1186:5: note:   template argument deduction/substitution failed:
a.cc:34:17: note:   'std::pair<const std::__cxx11::basic_string<char>, int>' is not derived from 'const std::multimap<_Key, _Tp, _Compare, _Allocator>'
   34 |     if (point > max) {
      |                 ^~~
a.cc:35:13: error: cannot convert 'std::pair<const std::__cxx11::basic_string<char>, int>' to 'int' in assignment
   35 |       max = point;
      |             ^~~~~
      |             |
      |             std::pair<const std::__cxx11::basic_string<char>, int>