Language: C++


#include <iostream>
#include <string>


int main(){
  std::string s;
  long long int k;
  std::cin >> s >> k;
  char buf = 0;
  long long int cnt = 0;
  bool sw = false;
  for( size_t i=0; i<s.length(); ++i ){
    if ( !sw && buf == s[i] ){
      cnt++;
      sw = true;
    } else { sw = false; }
    buf = s[i];
  }
  //
  if ( sw || s[0] != s[s.length()-1] ){
    // f - f
    std::cout << cnt * k << std::endl;
    return 0;
  }
  buf = 0;
  long long int cnt2 = 1;
  sw = true;
  for( size_t i=0; i<s.length(); ++i ){
    if ( i < 2 ){ sw = true; }
    if ( !sw && buf == s[i] ){
      cnt2++;
      sw = true;
    } else if ( i != s.length()-1 ){ sw = false; }
    buf = s[i];
  }
  //std::cout << cnt2 << std::endl;
  if (sw){
    std::cout << cnt*( k - k/2 ) + cnt2*( k/2 ) < cnt2*( k - k/2 ) + cnt*( k/2 ) ? cnt*( k - k/2 ) + cnt2*( k/2 ) : cnt2*( k - k/2 ) + cnt*( k/2 ) << std::endl;
    return 0;
  }
  std::cout << cnt + cnt2*( k-1 ) << std::endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:39:49: error: no match for 'operator<' (operand types are 'std::basic_ostream<char>::__ostream_type' {aka 'std::basic_ostream<char>'} and 'long long int')
   39 |     std::cout << cnt*( k - k/2 ) + cnt2*( k/2 ) < cnt2*( k - k/2 ) + cnt*( k/2 ) ? cnt*( k - k/2 ) + cnt2*( k/2 ) : cnt2*( k - k/2 ) + cnt*( k/2 ) << std::endl;
      |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |               |                                                    |
      |               |                                                    long long int
      |               std::basic_ostream<char>::__ostream_type {aka std::basic_ostream<char>}
a.cc:39:49: note: candidate: 'operator<(int, long long int)' (built-in)
   39 |     std::cout << cnt*( k - k/2 ) + cnt2*( k/2 ) < cnt2*( k - k/2 ) + cnt*( k/2 ) ? cnt*( k - k/2 ) + cnt2*( k/2 ) : cnt2*( k - k/2 ) + cnt*( k/2 ) << std::endl;
      |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
a.cc:39:49: note:   no known conversion for argument 1 from 'std::basic_ostream<char>::__ostream_type' {aka 'std::basic_ostream<char>'} to '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:2:
/usr/include/c++/14/bits/stl_iterator.h:448:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator<(const reverse_iterator<_Iterator>&, const reverse_iterator<_Iterator>&)'
  448 |     operator<(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:448:5: note:   template argument deduction/substitution failed:
a.cc:39:80: note:   'std::basic_ostream<char>::__ostream_type' {aka 'std::basic_ostream<char>'} is not derived from 'const std::reverse_iterator<_Iterator>'
   39 |     std::cout << cnt*( k - k/2 ) + cnt2*( k/2 ) < cnt2*( k - k/2 ) + cnt*( k/2 ) ? cnt*( k - k/2 ) + cnt2*( k/2 ) : cnt2*( k - k/2 ) + cnt*( k/2 ) << std::endl;
      |                                                                                ^
/usr/include/c++/14/bits/stl_iterator.h:493:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator<(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
  493 |     operator<(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:493:5: note:   template argument deduction/substitution failed:
a.cc:39:80: note:   'std::basic_ostream<char>::__ostream_type' {aka 'std::basic_ostream<char>'} is not derived from 'const std::reverse_iterator<_Iterator>'
   39 |     std::cout << cnt*( k - k/2 ) + cnt2*( k/2 ) < cnt2*( k - k/2 ) + cnt*( k/2 ) ? cnt*( k - k/2 ) + cnt2*( k/2 ) : cnt2*( k - k/2 ) + cnt*( k/2 ) << std::endl;
      |                                                                                ^
/usr/include/c++/14/bits/stl_iterator.h:1694:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator<(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)'
 1694 |     operator<(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1694:5: note:   template argument deduction/substitution failed:
a.cc:39:80: note:   'std::basic_ostream<char>::__ostream_type' {aka 'std::basic_ostream<char>'} is not derived from 'const std::move_iterator<_IteratorL>'
   39 |     std::cout << cnt*( k - k/2 ) + cnt2*( k/2 ) < cnt2*( k - k/2 ) + cnt*( k/2 ) ? cnt*( k - k/2 ) + cnt2*( k/2 ) : cnt2*( k - k/2 ) + cnt*( k/2 ) << std::endl;
      |                                                                                ^
/usr/include/c++/14/bits/stl_iterator.h:1760:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator<(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)'
 1760 |     operator<(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1760:5: note:   template argument deduction/substitution failed:
a.cc:39:80: note:   'std::basic_ostream<char>::__ostream_type' {aka 'std::basic_ostream<char>'} is not derived from 'const std::move_iterator<_IteratorL>'
   39 |     std::cout << cnt*( k - k/2 ) + cnt2*( k/2 ) < cnt2*( k - k/2 ) + cnt*( k/2 ) ? cnt*( k - k/2 ) + cnt2*( k/2 ) : cnt2*( k - k/2 ) + cnt*( k/2 ) << std::endl;
      |                                                                                ^
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:1045:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator<(const pair<_T1, _T2>&, const pair<_T1, _T2>&)'
 1045 |     operator<(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_pair.h:1045:5: note:   template argument deduction/substitution failed:
a.cc:39:80: note:   'std::basic_ostream<char>::__ostream_type' {aka 'std::basic_ostream<char>'} is not derived from 'const std::pair<_T1, _T2>'
   39 |     std::cout << cnt*( k - k/2 ) + cnt2*( k/2 ) < cnt2*( k - k/2 ) + cnt*( k/2 ) ? cnt*( k - k/2 ) + cnt2*( k/2 ) : cnt2*( k - k/2 ) + cnt*( k/2 ) << std::endl;
      |                                                                                ^
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:673:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator<(basic_string_view<_CharT, _Traits>, basic_string_view<_CharT, _Traits>)'
  673 |     operator< (basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:673:5: note:   template argument deduction/substitution failed:
a.cc:39:80: note:   'std::basic_ostream<char>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   39 |     std::cout << cnt*( k - k/2 ) + cnt2*( k/2 ) < cnt2*( k - k/2 ) + cnt*( k/2 ) ? cnt*( k - k/2 ) + cnt2*( k/2 ) : cnt2*( k - k/2 ) + cnt*( k/2 ) << std::endl;
      |                                                                                ^
/usr/include/c++/14/string_view:680:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator<(basic_string_view<_CharT, _Traits>, __type_identity_t<basic_string_view<_CharT, _Traits> >)'
  680 |     operator< (basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:680:5: note:   template argument deduction/substitution failed:
a.cc:39:80: note:   'std::basic_ostream<char>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   39 |     std::cout << cnt*( k - k/2 ) + cnt2*( k/2 ) < cnt2*( k - k/2 ) + cnt*( k/2 ) ? cnt*( k - k/2 ) + cnt2*( k/2 ) : cnt2*( k - k/2 ) + cnt*( k/2 ) << std::endl;
      |                                                                                ^
/usr/include/c++/14/string_view:688:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator<(__type_identity_t<basic_string_view<_CharT, _Traits> >, basic_string_view<_CharT, _Traits>)'
  688 |     operator< (__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:688:5: note:   template argument deduction/substitution failed:
a.cc:39:80: note:   mismatched types 'std::basic_string_view<_CharT, _Traits>' and 'long long int'
   39 |     std::cout << cnt*( k - k/2 ) + cnt2*( k/2 ) < cnt2*( k - k/2 ) + cnt*( k/2 ) ? cnt*( k - k/2 ) + cnt2*( k/2 ) : cnt2*( k - k/2 ) + cnt*( k/2 ) << std::endl;
      |                                                                                ^
/usr/include/c++/14/bits/basic_string.h:3874:5: 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>&)'
 3874 |     operator<(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3874:5: note:   template argument deduction/substitution failed:
a.cc:39:80: note:   'std::basic_ostream<char>::__ostream_type' {aka 'std::basic_ostream<char>'} is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   39 |     std::cout << cnt*( k - k/2 ) + cnt2*( k/2 ) < cnt2*( k - k/2 ) + cnt*( k/2 ) ? cnt*( k - k/2 ) + cnt2*( k/2 ) : cnt2*( k - k/2 ) + cnt*( k/2 ) << std::endl;
      |                                                                                ^
/usr/include/c++/14/bits/basic_string.h:3888:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator<(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const _CharT*)'
 3888 |     operator<(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3888:5: note:   template argument deduction/substitution failed:
a.cc:39:80: note:   'std::basic_ostream<char>::__ostream_type' {aka 'std::basic_ostream<char>'} is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   39 |     std::cout << cnt*( k - k/2 ) + cnt2*( k/2 ) < cnt2*( k - k/2 ) + cnt*( k/2 ) ? cnt*( k - k/2 ) + cnt2*( k/2 ) : cnt2*( k - k/2 ) + cnt*( k/2 ) << std::endl;
      |                                                                                ^
/usr/include/c++/14/bits/basic_string.h:3901:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator<(const _CharT*, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3901 |     operator<(const _CharT* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3901:5: note:   template argument deduction/substitution failed:
a.cc:39:80: note:   mismatched types 'const _CharT*'