Language: C++

#include <iostream>
#include <cstring>
#include <string>

#define MAX_TURN (1000)
#define MAX_LEN  (100)

using namespace std;

string is_only_lower(string str);

int main()
{    
    int  n;
    int  T_score = 0, H_score = 0;
    
    do {
        cin >> n;
    } while (n > MAX_LEN);

    
    string* Taro = (string*)malloc(sizeof(string) * n);
    string* Hanako = (string*)malloc(sizeof(string) * n);
   
    for (int i = 0; i < n; i++) {
         do {
             cin >> Taro[i] >> Hanako[i];	     
	 } while (Taro[i].length() > MAX_LEN || Hanako[i].length > MAX_LEN ||
                  is_only_lower(Taro[i]) == 0 || is_only_lower(Hanako[i]) == 0);

	 if (Taro[i] > Hanako[i]) {
	     T_score += 3;
         } else if (Taro[i] == Hanako[i]) {
	     T_score += 1;
             H_score += 1;
         } else {
	     H_score += 3;
         }
    }
	     
    cout << T_score << " " << H_score endl;
   
    free(Taro);
    free(Hanako);

    return (0);
}

string is_only_lower(string str)
{
       for (int i = 0; str[i] != '\0'; i++) {
            if (str[i] < 'a' || str[i] > 'z') {
	        break;
            }
       }
 
       if (str[i] == '\0') {
           return (1);
       } else {
           return (0);
       }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:28:59: error: invalid use of member function 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::length() const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]' (did you forget the '()' ?)
   28 |          } while (Taro[i].length() > MAX_LEN || Hanako[i].length > MAX_LEN ||
      |                                                 ~~~~~~~~~~^~~~~~
      |                                                                 ()
a.cc:29:42: error: no match for 'operator==' (operand types are 'std::string' {aka 'std::__cxx11::basic_string<char>'} and 'int')
   29 |                   is_only_lower(Taro[i]) == 0 || is_only_lower(Hanako[i]) == 0);
      |                   ~~~~~~~~~~~~~~~~~~~~~~ ^~ ~
      |                                |            |
      |                                |            int
      |                                std::string {aka std::__cxx11::basic_string<char>}
In file included from /usr/include/c++/14/iosfwd:42,
                 from /usr/include/c++/14/ios:40,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/postypes.h:192:5: note: candidate: 'template<class _StateT> bool std::operator==(const fpos<_StateT>&, const fpos<_StateT>&)'
  192 |     operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/postypes.h:192:5: note:   template argument deduction/substitution failed:
a.cc:29:45: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::fpos<_StateT>'
   29 |                   is_only_lower(Taro[i]) == 0 || is_only_lower(Hanako[i]) == 0);
      |                                             ^
In file included from /usr/include/c++/14/string:43,
                 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:
/usr/include/c++/14/bits/allocator.h:235:5: note: candidate: 'template<class _T1, class _T2> bool std::operator==(const allocator<_CharT>&, const allocator<_T2>&)'
  235 |     operator==(const allocator<_T1>&, const allocator<_T2>&)
      |     ^~~~~~~~
/usr/include/c++/14/bits/allocator.h:235:5: note:   template argument deduction/substitution failed:
a.cc:29:45: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::allocator<_CharT>'
   29 |                   is_only_lower(Taro[i]) == 0 || is_only_lower(Hanako[i]) == 0);
      |                                             ^
In file included from /usr/include/c++/14/string:48:
/usr/include/c++/14/bits/stl_iterator.h:441:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator==(const reverse_iterator<_Iterator>&, const reverse_iterator<_Iterator>&)'
  441 |     operator==(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:441:5: note:   template argument deduction/substitution failed:
a.cc:29:45: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::reverse_iterator<_Iterator>'
   29 |                   is_only_lower(Taro[i]) == 0 || is_only_lower(Hanako[i]) == 0);
      |                                             ^
/usr/include/c++/14/bits/stl_iterator.h:486:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
  486 |     operator==(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:486:5: note:   template argument deduction/substitution failed:
a.cc:29:45: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::reverse_iterator<_Iterator>'
   29 |                   is_only_lower(Taro[i]) == 0 || is_only_lower(Hanako[i]) == 0);
      |                                             ^
/usr/include/c++/14/bits/stl_iterator.h:1667:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)'
 1667 |     operator==(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1667:5: note:   template argument deduction/substitution failed:
a.cc:29:45: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::move_iterator<_IteratorL>'
   29 |                   is_only_lower(Taro[i]) == 0 || is_only_lower(Hanako[i]) == 0);
      |                                             ^
/usr/include/c++/14/bits/stl_iterator.h:1737:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator==(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)'
 1737 |     operator==(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1737:5: note:   template argument deduction/substitution failed:
a.cc:29:45: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::move_iterator<_IteratorL>'
   29 |                   is_only_lower(Taro[i]) == 0 || is_only_lower(Hanako[i]) == 0);
      |                                             ^
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:1033:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator==(const pair<_T1, _T2>&, const pair<_T1, _T2>&)'
 1033 |     operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_pair.h:1033:5: note:   template argument deduction/substitution failed:
a.cc:29:45: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'const std::pair<_T1, _T2>'
   29 |                   is_only_lower(Taro[i]) == 0 || is_only_lower(Hanako[i]) == 0);
      |                                             ^
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:629:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator==(basic_string_view<_CharT, _Traits>, __type_identity_t<basic_string_view<_CharT, _Traits> >)'
  629 |     operator==(basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:629:5: note:   template argument deduction/substitution failed:
a.cc:29:45: note:   'std::__cxx11::basic_string<char>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   29 |                   is_only_lower(Taro[i]) == 0 || is_only_lower(Hanako[i]) == 0);
      |                                             ^
/usr/include/c++/14/string_view:637:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator==(basic_string_view<_CharT, _Traits>, basic_string_view<_CharT, _Traits>)'
  637 |     operator==(basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:637:5: note:   template argument deduction/substitution failed:
a.cc:29:45: note:   'std::__cxx11::basic_string<char>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   29 |                   is_only_lower(Taro[i]) == 0 || is_only_lower(Hanako[i]) == 0);
      |                                             ^
/usr/include/c++/14/string_view:644:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator==(__type_identity_t<basic_string_view<_CharT, _Traits> >, basic_string_view<_CharT, _Traits>)'
  644 |     operator==(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:644:5: note:   template argument deduction/substitution failed:
a.cc:29:45: note:   mismatched types 'std::basic_string_view<_CharT, _Traits>' and 'int'
   29 |                   is_only_lower(Taro[i]) == 0 || is_only_lower(Hanako[i]) == 0);
      |                                             ^
/usr/include/c++/14/bits/basic_string.h:3755:5: 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>&)'
 3755 |     operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3755:5: note:   template argument deduction/substitution failed:
a.cc:29:45: note:   mismatched types 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>' and 'int'
   29 |                   is_only_lower(Taro[i]) == 0 || is_only_lower(Hanako[i]) == 0);
      |                                             ^
/usr/include/c++/14/bits/basic_string.h:3772:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const _CharT*)'
 3772 |     operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3772:5: note:   template argument deduction/substitution failed:
a.cc:29:45: note:   mismatched types 'const _CharT*' and 'int'
   29 |                   is_only_lower(Taro[i]) == 0 || is_only_lower(Hanako[i]) == 0);
      |                                             ^
/usr/include/c++/14/bits/basic_string.h:3819:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const _CharT*, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3819 |     operator==(const _CharT* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3819:5: note:   template argument deduction/substitution failed:
a.cc:29:45: note:   mismatched types 'const _CharT*' and 'std::__cxx11::basic_string<char>'
   29 |                   is_only_lower(Taro[i]) == 0 || is_only_lower(Hanako[i]) == 0);
      |