Language: C++

#include <bits/stdc++.h>
#define all(x) (x).begin(), (x).end()
using namespace std;
typedef long long ll;
const int MOD = 1e9 + 7;

int main() {
  int q, h, s, d, n;
  cin >> q >> h >> s >> d >> n;
  vector<pair<double, int>> m(4);
  m[0] = make_pair(q / 0.25, 0.25);
  m[1] = make_pair(h / 0.5, 0.5);
  m[2] = make_pair(q / 1, 1);
  m[3] = make_pair(q / 2, 2);
  sort(all(m));
  ll ans = 0;
  for (int i = 0; i <= 4; i++) {
    int x = n / m[i].second;
    if (m[i].second == 0.25) {
      ans += q + x;
    } else if (m[i].second == 0.5) {
      ans += h * x;
    } else if (m[i] == 1) {
      ans += s * x;
    } else if (m[i] == 2) {
      ans += d * x;
    }
    n = n % (m[i].second);
  }
  cout << ans << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:23:21: error: no match for 'operator==' (operand types are '__gnu_cxx::__alloc_traits<std::allocator<std::pair<double, int> >, std::pair<double, int> >::value_type' {aka 'std::pair<double, int>'} and 'int')
   23 |     } else if (m[i] == 1) {
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:1103:5: note: candidate: 'template<class _BiIter> bool std::__cxx11::operator==(const sub_match<_BiIter>&, const sub_match<_BiIter>&)'
 1103 |     operator==(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1103:5: note:   template argument deduction/substitution failed:
a.cc:23:24: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::pair<double, int> >, std::pair<double, int> >::value_type' {aka 'std::pair<double, int>'} is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   23 |     } else if (m[i] == 1) {
      |                        ^
/usr/include/c++/14/bits/regex.h:1199:5: 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>&)'
 1199 |     operator==(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1199:5: note:   template argument deduction/substitution failed:
a.cc:23:24: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::pair<double, int> >, std::pair<double, int> >::value_type' {aka 'std::pair<double, int>'} is not derived from 'std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>'
   23 |     } else if (m[i] == 1) {
      |                        ^
/usr/include/c++/14/bits/regex.h:1274:5: 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>&)'
 1274 |     operator==(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1274:5: note:   template argument deduction/substitution failed:
a.cc:23:24: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::pair<double, int> >, std::pair<double, int> >::value_type' {aka 'std::pair<double, int>'} is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   23 |     } else if (m[i] == 1) {
      |                        ^
/usr/include/c++/14/bits/regex.h:1366:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator==(const typename std::iterator_traits<_Iter>::value_type*, const sub_match<_BiIter>&)'
 1366 |     operator==(typename iterator_traits<_Bi_iter>::value_type const* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1366:5: note:   template argument deduction/substitution failed:
a.cc:23:24: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'int'
   23 |     } else if (m[i] == 1) {
      |                        ^
/usr/include/c++/14/bits/regex.h:1441:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator==(const sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type*)'
 1441 |     operator==(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1441:5: note:   template argument deduction/substitution failed:
a.cc:23:24: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::pair<double, int> >, std::pair<double, int> >::value_type' {aka 'std::pair<double, int>'} is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   23 |     } else if (m[i] == 1) {
      |                        ^
/usr/include/c++/14/bits/regex.h:1534:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator==(const typename std::iterator_traits<_Iter>::value_type&, const sub_match<_BiIter>&)'
 1534 |     operator==(typename iterator_traits<_Bi_iter>::value_type const& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1534:5: note:   template argument deduction/substitution failed:
a.cc:23:24: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'int'
   23 |     } else if (m[i] == 1) {
      |                        ^
/usr/include/c++/14/bits/regex.h:1613:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator==(const sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type&)'
 1613 |     operator==(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1613:5: note:   template argument deduction/substitution failed:
a.cc:23:24: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::pair<double, int> >, std::pair<double, int> >::value_type' {aka 'std::pair<double, int>'} is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   23 |     } else if (m[i] == 1) {
      |                        ^
/usr/include/c++/14/bits/regex.h:2186:5: note: candidate: 'template<class _Bi_iter, class _Alloc> bool std::__cxx11::operator==(const match_results<_BiIter, _Alloc>&, const match_results<_BiIter, _Alloc>&)'
 2186 |     operator==(const match_results<_Bi_iter, _Alloc>& __m1,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:2186:5: note:   template argument deduction/substitution failed:
a.cc:23:24: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::pair<double, int> >, std::pair<double, int> >::value_type' {aka 'std::pair<double, int>'} is not derived from 'const std::__cxx11::match_results<_BiIter, _Alloc>'
   23 |     } else if (m[i] == 1) {
      |                        ^
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: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:23:24: note:   mismatched types 'const std::pair<_T1, _T2>' and 'int'
   23 |     } else if (m[i] == 1) {
      |                        ^
In file included from /usr/include/c++/14/bits/stl_algobase.h:67:
/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:23:24: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::pair<double, int> >, std::pair<double, int> >::value_type' {aka 'std::pair<double, int>'} is not derived from 'const std::reverse_iterator<_Iterator>'
   23 |     } else if (m[i] == 1) {
      |                        ^
/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:23:24: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::pair<double, int> >, std::pair<double, int> >::value_type' {aka 'std::pair<double, int>'} is not derived from 'const std::reverse_iterator<_Iterator>'
   23 |     } else if (m[i] == 1) {
      |                        ^
/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:23:24: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::pair<double, int> >, std::pair<double, int> >::value_type' {aka 'std::pair<double, int>'} is not derived from 'const std::move_iterator<_IteratorL>'
   23 |     } else if (m[i] == 1) {
      |                        ^
/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:23:24: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::pair<double, int> >, std::pair<double, int> >::value_type' {aka 'std::pair<double, int>'} is not derived from 'const std::move_iterator<_IteratorL>'
   23 |     } else if (m[i] == 1) {
      |                        ^
In file included from /usr/include/c++/14/bits/char_traits.h:42,
                 from /usr/include/c++/14/string:42,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52:
/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:23:24: note:   '__gnu_cxx::__alloc_traits<std::allocator<std::pair<double, int> >, std::pair<double, int> >::value_type' {aka 'std::pair<double, int>'} is not derived from 'const std::fpos<_StateT>'
   23 |     } else if (m[i] == 1) {
      |                        ^
In file included from /usr/include/c++/14/string:43:
/usr/include/c++/14/bits/allocator.h:235:5: note: candidate: 'template<class _T1, class _T2> bool std::operator==(const allocator<_CharT>&, const