Language: C++

#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
#include<bitset>
#include<cassert>
#include<cctype>
#include<cmath>
#include<cstdlib>
#include<ctime>
#include<deque>
#include<iomanip>
#include<list>
#include<map>
#include<queue>
#include<set>
#include<stack>
#include<vector>
using namespace std;

#define pb push_back
//#define mp make_pair
#define myfor(i, a, b) for (int i = a; i < b; ++i)

template<typename T>inline bool upmin(T &x,T y) { return y<x?x=y,1:0; }

const double PI = acos(-1.0);
const double EPS = 1e-6;
const int INF = 0x3f3f3f3f;

int n;
int a[60], b[60];

int main()
{
    cin >> n;
    myfor(i, 1, n + 1) cin >> a[i];
    myfor(i, 1, n + 1) cin >> b[i];

    int ans = INF;
    myfor(i, 0, (1 << n) - 1) {
        int cnt = 0;
        vector<pair<int,int> > tp;

        myfor (j, 0, n) {
            if ((i >> (n - j - 1)) & 1) tp.pb(make_pair(-b[j + 1], j + 1));
            else tp.pb(make_pair(a[j + 1], j + 1));
        }
        myfor (j, 0, n) {
            for (int k = n - 1; k > j; k--) if (abs(tp[k].first) < abs(tp[k - 1].first)) {
                swap(tp[k], tp[k - 1]);
                cnt++;
            }
        }

        bool flag = true;
        int move_cnt = 0;

        myfor (j, 0, n) {
            move_cnt = abs(tp[j].second - (j + 1));
            if (tp[j].first < 0) {
                if (!(move_cnt & 1)) flag = false;
            }
            else {
                if (move_cnt & 1) flag = false;
            }
        }

        if (flag) ans = min(ans, cnt);
    }

    cout << ans == INF ? -1 : ans << endl;
    return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:72:17: error: no match for 'operator==' (operand types are 'std::basic_ostream<char>' and 'const int')
   72 |     cout << ans == INF ? -1 : ans << endl;
      |     ~~~~~~~~~~~ ^~ ~~~
      |          |         |
      |          |         const int
      |          std::basic_ostream<char>
a.cc:72:17: note: candidate: 'operator==(int, int)' (built-in)
   72 |     cout << ans == INF ? -1 : ans << endl;
      |     ~~~~~~~~~~~~^~~~~~
a.cc:72:17: note:   no known conversion for argument 1 from 'std::basic_ostream<char>' to 'int'
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:72:20: note:   'std::basic_ostream<char>' is not derived from 'const std::fpos<_StateT>'
   72 |     cout << ans == INF ? -1 : ans << endl;
      |                    ^~~
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:72:20: note:   'std::basic_ostream<char>' is not derived from 'const std::allocator<_CharT>'
   72 |     cout << ans == INF ? -1 : ans << endl;
      |                    ^~~
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:72:20: note:   'std::basic_ostream<char>' is not derived from 'const std::reverse_iterator<_Iterator>'
   72 |     cout << ans == INF ? -1 : ans << endl;
      |                    ^~~
/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:72:20: note:   'std::basic_ostream<char>' is not derived from 'const std::reverse_iterator<_Iterator>'
   72 |     cout << ans == INF ? -1 : ans << endl;
      |                    ^~~
/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:72:20: note:   'std::basic_ostream<char>' is not derived from 'const std::move_iterator<_IteratorL>'
   72 |     cout << ans == INF ? -1 : ans << endl;
      |                    ^~~
/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:72:20: note:   'std::basic_ostream<char>' is not derived from 'const std::move_iterator<_IteratorL>'
   72 |     cout << ans == INF ? -1 : ans << 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: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:72:20: note:   'std::basic_ostream<char>' is not derived from 'const std::pair<_T1, _T2>'
   72 |     cout << ans == INF ? -1 : ans << 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: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:72:20: note:   'std::basic_ostream<char>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   72 |     cout << ans == INF ? -1 : ans << endl;
      |                    ^~~
/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:72:20: note:   'std::basic_ostream<char>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   72 |     cout << ans == INF ? -1 : ans << endl;
      |                    ^~~
/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:72:20: note:   mismatched types 'std::basic_string_view<_CharT, _Traits>' and 'int'
   72 |     cout << ans == INF ? -1 : ans << endl;
      |                    ^~~
/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:72:20: note:   'std::basic_ostream<char>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   72 |     cout << ans == INF ? -1 : ans << endl;
      |                    ^~~
/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:72:20: note:   'std::basic_ostream<char>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   72 |     cout << ans == INF ? -1 : ans << endl;
      |                    ^~~
/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:72:20: note:   mismatched types 'const _CharT*' and 'std::basic_ostream<char>'
   72 |     cout << ans == INF ? -1 : ans << endl;
      |                    ^~~
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:2558:5: note: candidate: 'template<class ... _TElements, class ... _UElements> constexpr bool std::operator==(const tuple<_UTypes ...>&, const tuple<_Elements ...>&)'
 2558 |     operator==(const tuple<_TElements...>& __t,
      |     ^~~~~~~~
/usr/include/c++/14/tuple:2558:5: note:   template argument deduction/substitution failed:
a.cc:72:20: note:   'std::basic_ostream<char>' is not derived from 'const std::tuple<_UTypes ...>'
   72 |     cout << ans == INF ? -1 : ans << endl;
      |                    ^~~
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:234:5: note: candidate: 'template<class _CharT, class _Traits> bool std::operator==(const istreambuf_iterator<_CharT, _Traits>&, const istreambuf_iterator<_CharT, _Traits>&)'
  234 |     operator==(const istreambuf_iterator<_CharT, _Traits>& __a,
      |     ^~~~~~~~
/usr/include/c++/14/bits/streambuf_iterator.h:234:5: note:   template argument deduction/substitution failed:
a.cc:72:20: note:   'std::basic_ostream<char>' is not derived from 'const std::istreambuf_iterator<_CharT, _T