Language: C++

#include <bits/stdc++.h>

using namespace std;

int main () {
  string s;
  cin >> s;
  
  int n = (int)s.size();
  string t = s;
  sort(s.begin(), s.end, greater<char>());
  int cnt = 0;
  for (int i = 0; i < n; ++i) {
    if (s[i] != t[i]) cnt++;
  }
  cout << n - cnt << endl;
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:7: error: no matching function for call to 'sort(std::__cxx11::basic_string<char>::iterator, <unresolved overloaded function type>, std::greater<char>)'
   11 |   sort(s.begin(), s.end, greater<char>());
      |   ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/algorithm:61,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algo.h:4762:5: note: candidate: 'template<class _RAIter> void std::sort(_RAIter, _RAIter)'
 4762 |     sort(_RandomAccessIterator __first, _RandomAccessIterator __last)
      |     ^~~~
/usr/include/c++/14/bits/stl_algo.h:4762:5: note:   candidate expects 2 arguments, 3 provided
/usr/include/c++/14/bits/stl_algo.h:4793:5: note: candidate: 'void std::sort(_RAIter, _RAIter, _Compare) [with _RAIter = __gnu_cxx::__normal_iterator<char*, __cxx11::basic_string<char> >; _Compare = greater<char>]'
 4793 |     sort(_RandomAccessIterator __first, _RandomAccessIterator __last,
      |     ^~~~
/usr/include/c++/14/bits/stl_algo.h:4793:63: note:   no known conversion for argument 2 from '<unresolved overloaded function type>' to '__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> >'
 4793 |     sort(_RandomAccessIterator __first, _RandomAccessIterator __last,
      |                                         ~~~~~~~~~~~~~~~~~~~~~~^~~~~~
In file included from /usr/include/c++/14/algorithm:86:
/usr/include/c++/14/pstl/glue_algorithm_defs.h:292:1: note: candidate: 'template<class _ExecutionPolicy, class _RandomAccessIterator, class _Compare> __pstl::__internal::__enable_if_execution_policy<_ExecutionPolicy, void> std::sort(_ExecutionPolicy&&, _RandomAccessIterator, _RandomAccessIterator, _Compare)'
  292 | sort(_ExecutionPolicy&& __exec, _RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp);
      | ^~~~
/usr/include/c++/14/pstl/glue_algorithm_defs.h:292:1: note:   candidate expects 4 arguments, 3 provided
/usr/include/c++/14/pstl/glue_algorithm_defs.h:296:1: note: candidate: 'template<class _ExecutionPolicy, class _RandomAccessIterator> __pstl::__internal::__enable_if_execution_policy<_ExecutionPolicy, void> std::sort(_ExecutionPolicy&&, _RandomAccessIterator, _RandomAccessIterator)'
  296 | sort(_ExecutionPolicy&& __exec, _RandomAccessIterator __first, _RandomAccessIterator __last);
      | ^~~~
/usr/include/c++/14/pstl/glue_algorithm_defs.h:296:1: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/14/pstl/glue_algorithm_defs.h:15:
/usr/include/c++/14/pstl/execution_defs.h: In substitution of 'template<class _ExecPolicy, class _Tp> using __pstl::__internal::__enable_if_execution_policy = typename std::enable_if<__pstl::execution::v1::is_execution_policy<typename std::remove_cv<typename std::remove_reference<_Tp>::type>::type>::value, _Tp>::type [with _ExecPolicy = __gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> >; _Tp = void]':
/usr/include/c++/14/pstl/glue_algorithm_defs.h:296:1:   required by substitution of 'template<class _ExecutionPolicy, class _RandomAccessIterator> __pstl::__internal::__enable_if_execution_policy<_ExecutionPolicy, void> std::sort(_ExecutionPolicy&&, _RandomAccessIterator, _RandomAccessIterator) [with _ExecutionPolicy = __gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> >; _RandomAccessIterator = std::greater<char>]'
a.cc:11:7:   required from here
   11 |   sort(s.begin(), s.end, greater<char>());
      |   ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/pstl/execution_defs.h:82:7: error: no type named 'type' in 'struct std::enable_if<false, void>'
   82 | using __enable_if_execution_policy =
      |       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~