Language: C++

#include <iostream>
using namespace std;
class Card {
public:
    int num;
    char ch;
};
inline void bubbleSort(Card a[], int n){
    bool flag = 1;
    for (int i = 0; flag; i++) {
        flag = 0;
        for (int j = n - 1; j >= i + 1; j--) {
            if (a[j].num < a[j - 1].num) {
                swap(a[j], a[j - 1]);
                flag = 1;
            }
        }
    }
}
inline void selectionSort(Card a[], int n) {
    for (int i = 0; i < n-1; i++) {
        int minj = i;
        for (int j = i + 1; j < n; j++) {
            if (a[j].num < a[minj].num) {
                minj = j;
            }
        }
        swap(a[i], a[minj]);
    }
}
inline void put(Card a[], int n) {
    cout << a[0].ch << a[0].num;
    for (int i = 1; i < n; i++) {
        cout << ' ' << a[i].ch << a[i].num;
    }
    cout << endl;
}
inline bool isStable(Card a[], Card b[], int n){
    for(int i = 0; i < n; i++){
        if(a[i] != b[i]){
           return false;}
}

            return true;
}

else return 0;
int main() {
    const int n = 36;
    Card ar1[n], ar2[n];
    int num;
    cin >> num;
    for (int i = 0; i < num; i++) {
        cin >> ar1[i].ch >> ar1[i].num;
    }
    for (int i = 0; i < num; i++)
        ar2[i] = ar1[i];
    bubbleSort(ar1, num);
    put(ar1, num);
    cout << "Stable" << endl;
    selectionSort(ar2, num);
    put(ar2, num);
    if(isStable(ar1, ar2, num))
       cout << "Stable" << endl;
    else cout << "Not Stable" << endl;
    
    return 0;
}

Compiler output:
a.cc: In function 'bool isStable(Card*, Card*, int)':
a.cc:40:17: error: no match for 'operator!=' (operand types are 'Card' and 'Card')
   40 |         if(a[i] != b[i]){
      |            ~~~~ ^~ ~~~~
      |               |       |
      |               Card    Card
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:197:5: note: candidate: 'template<class _StateT> bool std::operator!=(const fpos<_StateT>&, const fpos<_StateT>&)'
  197 |     operator!=(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/postypes.h:197:5: note:   template argument deduction/substitution failed:
a.cc:40:23: note:   'Card' is not derived from 'const std::fpos<_StateT>'
   40 |         if(a[i] != b[i]){
      |                       ^
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:243:5: note: candidate: 'template<class _T1, class _T2> bool std::operator!=(const allocator<_CharT>&, const allocator<_T2>&)'
  243 |     operator!=(const allocator<_T1>&, const allocator<_T2>&)
      |     ^~~~~~~~
/usr/include/c++/14/bits/allocator.h:243:5: note:   template argument deduction/substitution failed:
a.cc:40:23: note:   'Card' is not derived from 'const std::allocator<_CharT>'
   40 |         if(a[i] != b[i]){
      |                       ^
In file included from /usr/include/c++/14/string:48:
/usr/include/c++/14/bits/stl_iterator.h:455:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator!=(const reverse_iterator<_Iterator>&, const reverse_iterator<_Iterator>&)'
  455 |     operator!=(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:455:5: note:   template argument deduction/substitution failed:
a.cc:40:23: note:   'Card' is not derived from 'const std::reverse_iterator<_Iterator>'
   40 |         if(a[i] != b[i]){
      |                       ^
/usr/include/c++/14/bits/stl_iterator.h:500:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator!=(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
  500 |     operator!=(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:500:5: note:   template argument deduction/substitution failed:
a.cc:40:23: note:   'Card' is not derived from 'const std::reverse_iterator<_Iterator>'
   40 |         if(a[i] != b[i]){
      |                       ^
/usr/include/c++/14/bits/stl_iterator.h:1686:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator!=(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)'
 1686 |     operator!=(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1686:5: note:   template argument deduction/substitution failed:
a.cc:40:23: note:   'Card' is not derived from 'const std::move_iterator<_IteratorL>'
   40 |         if(a[i] != b[i]){
      |                       ^
/usr/include/c++/14/bits/stl_iterator.h:1753:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator!=(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)'
 1753 |     operator!=(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1753:5: note:   template argument deduction/substitution failed:
a.cc:40:23: note:   'Card' is not derived from 'const std::move_iterator<_IteratorL>'
   40 |         if(a[i] != b[i]){
      |                       ^
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:1052:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator!=(const pair<_T1, _T2>&, const pair<_T1, _T2>&)'
 1052 |     operator!=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_pair.h:1052:5: note:   template argument deduction/substitution failed:
a.cc:40:23: note:   'Card' is not derived from 'const std::pair<_T1, _T2>'
   40 |         if(a[i] != b[i]){
      |                       ^
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:651:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator!=(basic_string_view<_CharT, _Traits>, basic_string_view<_CharT, _Traits>)'
  651 |     operator!=(basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:651:5: note:   template argument deduction/substitution failed:
a.cc:40:23: note:   'Card' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   40 |         if(a[i] != b[i]){
      |                       ^
/usr/include/c++/14/string_view:658:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator!=(basic_string_view<_CharT, _Traits>, __type_identity_t<basic_string_view<_CharT, _Traits> >)'
  658 |     operator!=(basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:658:5: note:   template argument deduction/substitution failed:
a.cc:40:23: note:   'Card' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   40 |         if(a[i] != b[i]){
      |                       ^
/usr/include/c++/14/string_view:666:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator!=(__type_identity_t<basic_string_view<_CharT, _Traits> >, basic_string_view<_CharT, _Traits>)'
  666 |     operator!=(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:666:5: note:   template argument deduction/substitution failed:
a.cc:40:23: note:   'Card' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   40 |         if(a[i] != b[i]){
      |                       ^
/usr/include/c++/14/bits/basic_string.h:3833:5: 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>&)'
 3833 |     operator!=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3833:5: note:   template argument deduction/substitution failed:
a.cc:40:23: note:   'Card' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   40 |         if(a[i] != b[i]){
      |                       ^
/usr/include/c++/14/bits/basic_string.h:3847:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator!=(const _CharT*, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3847 |     operator!=(const _CharT* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3847:5: note:   template argument deduction/substitution failed:
a.cc:40:23: note:   mismatched types 'const _CharT*' and 'Card'
   40 |         if(a[i] != b[i]){
      |                       ^
/usr/include/c++/14/bits/basic_string.h:3860:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator!=(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const _CharT*)'
 3860 |     operator!=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3860:5: note:   template argument deduction/substitution failed:
a.cc:40:23: note:   'Card' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   40 |         if(a[i] != b[i]){
      |                       ^
In file included from /usr/include/c++/14/bits/memory_resource.h:47,
                 from /usr/include/c++/14/string:68:
/usr/include/c++/14/tuple:2613:5: note: candidate: 'template<class ... _TElements, class ... _UElements> constexpr bool std::operator!=(const tuple<_UTypes ...>&, const tuple<_Elements ...>&)'
 2613 |     operator!=(const tuple<_TElements...>& __t,
      |     ^~~~~~~~
/usr/include/c++/14/tuple:2613:5: note:   template argument deduction/substitution failed:
a.cc:40:23: note:   'Card' is not derived from 'const std::tuple<_UTypes ...>'
   40 |         if(a[i] != b[i]){
      |                       ^
In file included from /usr/include/c++/14/bits/locale_facets.h:48,
                 from /usr/include/c++/14/bits/basic_ios.h:37,
                 from /usr/include/c++/14/ios:46:
/usr/include/c++/14/bits/streambuf_iterator.h:242:5: note: candidate: 'template<class _CharT, class _Traits> bool std::operator!=(const istreambuf_iterator<_CharT, _Traits>&, const istreambuf_iterator<_CharT, _Traits>&)'
  242 |     operator!=(const istreambuf_iterator<_CharT, _Traits>& __a,
      |     ^~~~~~~~
/usr/include/c++/14/bits/streambuf_iterator.h:242:5: note:   template argument deduction/substitution failed:
a.cc:40:23: note:   'Card' is not derived from 'const std::istreambuf_iterator<_CharT, _Traits>'
   40 |         if(a[i] != b[i]){
      |                       ^
In file included from /usr/include/c++/14/bits/ios_base.h:46:
/usr/include/c++/14/system_error:525:3: note: candidate: 'bool std::operator!=(const error_code&, const error_code&)'
  525 |   operator!=(const error_code& __lhs, const error_code& __rhs) noexcept
      |   ^~~~~~~~
/usr/include/c++/14/system_error:525:32: note:   no known conversion for argument 1 from 'Card' to 'const std::error_code&'
  525 |   operator!=(const error_code& __lhs, const error_code& __rhs) noexcept
      |              ~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/14/system_error:530:3: note: candidate: 'bool std::operator!=(const error_code&, const error_condition&)'
  530 |   operator!=(const error_code& __lhs, const error_condition& __rhs) noex