Language: C++

#include <iostream>
#include <string>
#include <map>

int main(){
    std::map<std::string, int> score;
    int N, M;
    std::cin >> N;
    std::string *blue = new std::string[N];
    for(int i = 0; i < N; i++){
        std::cin >> blue[i];
        if(score[blue[i]] == 0){
            score[blue[i]] = 0;
        }
        score[blue[i]] += 1;
    }
    std::cin >> M;
    std::string *red = new std::string[M];
    for(int j = 0; j < M; j++){
        std::cin >> red[j];
        if(score[red[j]] == 0){
            score[red[j]] = 0;
        }
        score[red[j]] -= 1;
    }
    int max = 0;
    for(auto ite = score.begin(); ite != score.end(); ++ite){
        if(*ite > max){
            max = *ite;
        }
    }
    std::cout << max << std::endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:28:17: error: no match for 'operator>' (operand types are 'std::pair<const std::__cxx11::basic_string<char>, int>' and 'int')
   28 |         if(*ite > 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:28:19: note:   'std::pair<const std::__cxx11::basic_string<char>, int>' is not derived from 'const std::reverse_iterator<_Iterator>'
   28 |         if(*ite > 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:28:19: note:   'std::pair<const std::__cxx11::basic_string<char>, int>' is not derived from 'const std::reverse_iterator<_Iterator>'
   28 |         if(*ite > 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:28:19: note:   'std::pair<const std::__cxx11::basic_string<char>, int>' is not derived from 'const std::move_iterator<_IteratorL>'
   28 |         if(*ite > 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:28:19: note:   'std::pair<const std::__cxx11::basic_string<char>, int>' is not derived from 'const std::move_iterator<_IteratorL>'
   28 |         if(*ite > 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:28:19: note:   mismatched types 'const std::pair<_T1, _T2>' and 'int'
   28 |         if(*ite > 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:28:19: note:   'std::pair<const std::__cxx11::basic_string<char>, int>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   28 |         if(*ite > 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:28:19: note:   'std::pair<const std::__cxx11::basic_string<char>, int>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   28 |         if(*ite > 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:28:19: note:   mismatched types 'std::basic_string_view<_CharT, _Traits>' and 'int'
   28 |         if(*ite > 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:28:19: note:   'std::pair<const std::__cxx11::basic_string<char>, int>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   28 |         if(*ite > 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:28:19: note:   'std::pair<const std::__cxx11::basic_string<char>, int>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   28 |         if(*ite > 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:28:19: note:   mismatched types 'const _CharT*' and 'std::pair<const std::__cxx11::basic_string<char>, int>'
   28 |         if(*ite > 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:28:19: note:   'std::pair<const std::__cxx11::basic_string<char>, int>' is not derived from 'const std::tuple<_UTypes ...>'
   28 |         if(*ite > max){
      |                   ^~~
In file included from /usr/include/c++/14/map:63,
                 from a.cc:3:
/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:28:19: note:   'std::pair<const std::__cxx11::basic_string<char>, int>' is not derived from 'const std::map<_Key, _Tp, _Compare, _Allocator>'
   28 |         if(*ite > 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:28:19: note:   'std::pair<const std::__cxx11::basic_string<char>, int>' is not derived from 'const std::multimap<_Key, _Tp, _Compare, _Allocator>'
   28 |         if(*ite > max){
      |                   ^~~
a.cc:29:19: error: cannot convert 'std::pair<const std::__cxx11::basic_string<char>, int>' to 'int' in assignment
   29 |             max = *ite;
      |                   ^~~~
      |                   |
      |                   std::pair<const std::__cxx11::basic_string<char>, int>