Language: C++

#include <bits/stdc++.h>
#define REP(i, n) for(int i = 0;i < n;i++)
#define REPR(i, n) for(int i = n;i >= 0;i--)
#define FOR(i, m, n) for(int i = m;i < n;i++)
#define FORR(i, m, n) for(int i = m;i >= n;i--)
#define SORT(v, n) sort(v, v+n);
#define VSORT(v) sort(v.begin(), v.end());
#define llong long long
#define pb(a) push_back(a)
#define INF 1000000000
using namespace std;
typedef pair<int, int> P;
typedef pair<llong, llong> LP;
typedef pair<int, P> PP;
typedef pair<llong, LP> LPP;

int dy[]={0, 0, 1, -1, 0};
int dx[]={1, -1, 0, 0, 0};

int main(){
  cin.tie(0);
  ios::sync_with_stdio(false);
  map<string, int> yen{};
  int N,M;
  cin >> N;
  for(int i=0;i<N;i++){
    string s;
    cin >> s;
    if(yen.count(s)) yen[s] += 1;
    else yen.insert(make_pair(s,1));
  }
  cin >> M;
  for(int i=0;i<M;i++){
    string s;
    cin >> s;
    if(yen.count(s)) yen[s] -= 1;
    else yen.insert(make_pair(s,-1));
  }
  if(max_element(yen.begin(),yen.end()) > 0) cout << max_element(yen.begin(),yen.end()) << endl;
  else cout << 0 << endl;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:39:41: error: no match for 'operator>' (operand types are 'std::_Rb_tree_iterator<std::pair<const std::__cxx11::basic_string<char>, int> >' and 'int')
   39 |   if(max_element(yen.begin(),yen.end()) > 0) cout << max_element(yen.begin(),yen.end()) << endl;
      |      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~
      |                 |                         |
      |                 |                         int
      |                 std::_Rb_tree_iterator<std::pair<const std::__cxx11::basic_string<char>, 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:39:43: note:   'std::_Rb_tree_iterator<std::pair<const std::__cxx11::basic_string<char>, int> >' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   39 |   if(max_element(yen.begin(),yen.end()) > 0) cout << max_element(yen.begin(),yen.end()) << endl;
      |                                           ^
/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:39:43: note:   'std::_Rb_tree_iterator<std::pair<const std::__cxx11::basic_string<char>, int> >' is not derived from 'std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>'
   39 |   if(max_element(yen.begin(),yen.end()) > 0) cout << max_element(yen.begin(),yen.end()) << endl;
      |                                           ^
/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:39:43: note:   'std::_Rb_tree_iterator<std::pair<const std::__cxx11::basic_string<char>, int> >' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   39 |   if(max_element(yen.begin(),yen.end()) > 0) cout << max_element(yen.begin(),yen.end()) << endl;
      |                                           ^
/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:39:43: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'int'
   39 |   if(max_element(yen.begin(),yen.end()) > 0) cout << max_element(yen.begin(),yen.end()) << endl;
      |                                           ^
/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:39:43: note:   'std::_Rb_tree_iterator<std::pair<const std::__cxx11::basic_string<char>, int> >' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   39 |   if(max_element(yen.begin(),yen.end()) > 0) cout << max_element(yen.begin(),yen.end()) << endl;
      |                                           ^
/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:39:43: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'int'
   39 |   if(max_element(yen.begin(),yen.end()) > 0) cout << max_element(yen.begin(),yen.end()) << endl;
      |                                           ^
/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:39:43: note:   'std::_Rb_tree_iterator<std::pair<const std::__cxx11::basic_string<char>, int> >' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   39 |   if(max_element(yen.begin(),yen.end()) > 0) cout << max_element(yen.begin(),yen.end()) << endl;
      |                                           ^
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:39:43: note:   'std::_Rb_tree_iterator<std::pair<const std::__cxx11::basic_string<char>, int> >' is not derived from 'const std::pair<_T1, _T2>'
   39 |   if(max_element(yen.begin(),yen.end()) > 0) cout << max_element(yen.begin(),yen.end()) << endl;
      |                                           ^
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:39:43: note:   'std::_Rb_tree_iterator<std::pair<const std::__cxx11::basic_string<char>, int> >' is not derived from 'const std::reverse_iterator<_Iterator>'
   39 |   if(max_element(yen.begin(),yen.end()) > 0) cout << max_element(yen.begin(),yen.end()) << endl;
      |                                           ^
/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:39:43: note:   'std::_Rb_tree_iterator<std::pair<const std::__cxx11::basic_string<char>, int> >' is not derived from 'const std::reverse_iterator<_Iterator>'
   39 |   if(max_element(yen.begin(),yen.end()) > 0) cout << max_element(yen.begin(),yen.end()) << endl;
      |                                           ^
/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:39:43: note:   'std::_Rb_tree_iterator<std::pair<const std::__cxx11::basic_string<char>, int> >' is not derived from 'const std::move_iterator<_IteratorL>'
   39 |   if(max_element(yen.begin(),yen.end()) > 0) cout << max_element(yen.begin(),yen.end()) << endl;
      |                                           ^
/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:39:43: note:   'std::_Rb_tree_iterator<std::pair<const std::__cxx11::basic_string<char>, int> >' is not derived from 'const std::move_iterator<_IteratorL>'
   39 |   if(max_element(yen.begin(),yen.end()) > 0) cout << max_element(yen.begin(),yen.end()) << endl;
      |                                           ^
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:39:43: note:   'std::_Rb_tree_iterator<std::pair<const std::__cxx11::basic_string<char>, int> >' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   39 |   if(max_element(yen.begin(),yen.end()) > 0) cout << max_element(yen.begin(),