Language: C++

#include <bits/stdc++.h>
using namespace std;
#define forx(i, a, b) for (int i = (a); i < (b); i++)
#define rep(j, n) for (int j = 0; j < (n); j++)

typedef long long ll;

int main(){
int n;
cin>>n;
vector<int>a(n),b(n),c(n);
ll ans;
rep(i,n)cin>>a[i];
rep(i,n)cin>>b[i];
rep(i,n)cin>>c[i];
sort(a.begin(),a.end());
sort(b.begin(),b.end());
sort(c.begin(),c.end());

rep(j,n){
  int na=upper_bound(a.begin(),a.end(),b[j])-a;  
  int nc=lower_bownd(c.begin(),c.end(),b[j])-c;
  ans+=na*nc;
}
cout<<ans<<endl;
return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:21:45: error: no match for 'operator-' (operand types are '__gnu_cxx::__normal_iterator<int*, std::vector<int> >' and 'std::vector<int>')
   21 |   int na=upper_bound(a.begin(),a.end(),b[j])-a;
      |          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~
      |                     |                        |
      |                     |                        std::vector<int>
      |                     __gnu_cxx::__normal_iterator<int*, std::vector<int> >
In file included from /usr/include/c++/14/bits/stl_algobase.h:67,
                 from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_iterator.h:1148:7: note: candidate: '__gnu_cxx::__normal_iterator<_Iterator, _Container> __gnu_cxx::__normal_iterator<_Iterator, _Container>::operator-(difference_type) const [with _Iterator = int*; _Container = std::vector<int>; difference_type = long int]'
 1148 |       operator-(difference_type __n) const _GLIBCXX_NOEXCEPT
      |       ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1148:33: note:   no known conversion for argument 1 from 'std::vector<int>' to '__gnu_cxx::__normal_iterator<int*, std::vector<int> >::difference_type' {aka 'long int'}
 1148 |       operator-(difference_type __n) const _GLIBCXX_NOEXCEPT
      |                 ~~~~~~~~~~~~~~~~^~~
/usr/include/c++/14/bits/stl_iterator.h:618:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr decltype ((__y.base() - __x.base())) std::operator-(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
  618 |     operator-(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:618:5: note:   template argument deduction/substitution failed:
a.cc:21:46: note:   '__gnu_cxx::__normal_iterator<int*, std::vector<int> >' is not derived from 'const std::reverse_iterator<_Iterator>'
   21 |   int na=upper_bound(a.begin(),a.end(),b[j])-a;
      |                                              ^
/usr/include/c++/14/bits/stl_iterator.h:1790:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr decltype ((__x.base() - __y.base())) std::operator-(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)'
 1790 |     operator-(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1790:5: note:   template argument deduction/substitution failed:
a.cc:21:46: note:   '__gnu_cxx::__normal_iterator<int*, std::vector<int> >' is not derived from 'const std::move_iterator<_IteratorL>'
   21 |   int na=upper_bound(a.begin(),a.end(),b[j])-a;
      |                                              ^
In file included from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/usr/include/c++/14/complex:370:5: note: candidate: 'template<class _Tp> std::complex<_Tp> std::operator-(const complex<_Tp>&, const complex<_Tp>&)'
  370 |     operator-(const complex<_Tp>& __x, const complex<_Tp>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/complex:370:5: note:   template argument deduction/substitution failed:
a.cc:21:46: note:   '__gnu_cxx::__normal_iterator<int*, std::vector<int> >' is not derived from 'const std::complex<_Tp>'
   21 |   int na=upper_bound(a.begin(),a.end(),b[j])-a;
      |                                              ^
/usr/include/c++/14/complex:379:5: note: candidate: 'template<class _Tp> std::complex<_Tp> std::operator-(const complex<_Tp>&, const _Tp&)'
  379 |     operator-(const complex<_Tp>& __x, const _Tp& __y)
      |     ^~~~~~~~
/usr/include/c++/14/complex:379:5: note:   template argument deduction/substitution failed:
a.cc:21:46: note:   '__gnu_cxx::__normal_iterator<int*, std::vector<int> >' is not derived from 'const std::complex<_Tp>'
   21 |   int na=upper_bound(a.begin(),a.end(),b[j])-a;
      |                                              ^
/usr/include/c++/14/complex:388:5: note: candidate: 'template<class _Tp> std::complex<_Tp> std::operator-(const _Tp&, const complex<_Tp>&)'
  388 |     operator-(const _Tp& __x, const complex<_Tp>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/complex:388:5: note:   template argument deduction/substitution failed:
a.cc:21:46: note:   'std::vector<int>' is not derived from 'const std::complex<_Tp>'
   21 |   int na=upper_bound(a.begin(),a.end(),b[j])-a;
      |                                              ^
/usr/include/c++/14/complex:465:5: note: candidate: 'template<class _Tp> std::complex<_Tp> std::operator-(const complex<_Tp>&)'
  465 |     operator-(const complex<_Tp>& __x)
      |     ^~~~~~~~
/usr/include/c++/14/complex:465:5: note:   candidate expects 1 argument, 2 provided
In file included from /usr/include/c++/14/valarray:605,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:166:
/usr/include/c++/14/bits/valarray_after.h:406:5: note: candidate: 'template<class _Dom1, class _Dom2> std::_Expr<std::__detail::_BinClos<std::__minus, std::_Expr, std::_Expr, _Dom1, _Dom2>, typename std::__fun<std::__minus, typename _Dom1::value_type>::result_type> std::operator-(const _Expr<_Dom1, typename _Dom1::value_type>&, const _Expr<_Dom2, typename _Dom2::value_type>&)'
  406 |     _DEFINE_EXPR_BINARY_OPERATOR(-, struct std::__minus)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:406:5: note:   template argument deduction/substitution failed:
a.cc:21:46: note:   '__gnu_cxx::__normal_iterator<int*, std::vector<int> >' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   21 |   int na=upper_bound(a.begin(),a.end(),b[j])-a;
      |                                              ^
/usr/include/c++/14/bits/valarray_after.h:406:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__minus, std::_Expr, std::_Constant, _Dom, typename _Dom::value_type>, typename std::__fun<std::__minus, typename _Dom1::value_type>::result_type> std::operator-(const _Expr<_Dom1, typename _Dom1::value_type>&, const typename _Dom::value_type&)'
  406 |     _DEFINE_EXPR_BINARY_OPERATOR(-, struct std::__minus)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:406:5: note:   template argument deduction/substitution failed:
a.cc:21:46: note:   '__gnu_cxx::__normal_iterator<int*, std::vector<int> >' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   21 |   int na=upper_bound(a.begin(),a.end(),b[j])-a;
      |                                              ^
/usr/include/c++/14/bits/valarray_after.h:406:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__minus, std::_Constant, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__minus, typename _Dom1::value_type>::result_type> std::operator-(const typename _Dom::value_type&, const _Expr<_Dom1, typename _Dom1::value_type>&)'
  406 |     _DEFINE_EXPR_BINARY_OPERATOR(-, struct std::__minus)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:406:5: note:   template argument deduction/substitution failed:
a.cc:21:46: note:   'std::vector<int>' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   21 |   int na=upper_bound(a.begin(),a.end(),b[j])-a;
      |                                              ^
/usr/include/c++/14/bits/valarray_after.h:406:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__minus, std::_Expr, std::_ValArray, _Dom, typename _Dom::value_type>, typename std::__fun<std::__minus, typename _Dom1::value_type>::result_type> std::operator-(const _Expr<_Dom1, typename _Dom1::value_type>&, const valarray<typename _Dom::value_type>&)'
  406 |     _DEFINE_EXPR_BINARY_OPERATOR(-, struct std::__minus)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:406:5: note:   template argument deduction/substitution failed:
a.cc:21:46: note:   '__gnu_cxx::__normal_iterator<int*, std::vector<int> >' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   21 |   int na=upper_bound(a.begin(),a.end(),b[j])-a;
      |                                              ^
/usr/include/c++/14/bits/valarray_after.h:406:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__minus, std::_ValArray, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__minus, typename _Dom1::value_type>::result_type> std::operator-(const valarray<typename _Dom::value_type>&, const _Expr<_Dom1, typename _Dom1::value_type>&)'
  406 |     _DEFINE_EXPR_BINARY_OPERATOR(-, struct std::__minus)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:406:5: note:   template argument deduction/substitution failed:
a.cc:21:46: note:   'std::vector<int>' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   21 |   int na=upper_bound(a.begin(),a.end(),b[j])-a;
      |                                              ^
/usr/include/c++/14/valarray:1197:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__minus, std::_ValArray, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__minus, _Tp>::result_type> std::operator-(const valarray<_Tp>&, const valarray<_Tp>&)'
 1197 | _DEFINE_BINARY_OPERATOR(-, __minus)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/valarray:1197:1: note:   template argument deduction/substitution failed:
a.cc:21:46: note:   '__gnu_cxx::__normal_iterator<int*, std::vector<int> >' is not derived from 'const std::valarray<_Tp>'
   21 |   int na=upper_bound(a.begin(),a.end(),b[j])-a;
      |                                              ^
/usr/include/c++/14/valarray:1197:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__minus, std::_ValArray, std::_Constant, _Tp, _Tp>, typename std::__fun<std::__minus, _Tp>::result_type> std::operator-(const valarray<_Tp>&, const typename valarray<_Tp>::value_type&)'
 1197 | _DEFINE_BINARY_OPERATOR(-, __minus)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/valarray:1197:1: n