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#include <bits/stdc++.h>
using namespace std;
 
int main() {
	// your code goes here
	map < int, int > mp;
	mp[1] = 2;
	mp[2] = 3;
	map < int, int >::iterator it = mp.lower_bound(2);
	cout << it - mp.begin() << endl;
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:10:13: error: no match for ‘operator-’ (operand types are ‘std::map<int, int>::iterator {aka std::_Rb_tree_iterator<std::pair<const int, int> >}’ and ‘std::map<int, int>::iterator {aka std::_Rb_tree_iterator<std::pair<const int, int> >}’)
  cout << it - mp.begin() << endl;
          ~~~^~~~~~~~~~~~
In file included from /usr/include/c++/6/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/6/bits/char_traits.h:39,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from /usr/include/c++/6/complex:45,
                 from /usr/include/c++/6/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_iterator.h:333:5: note: candidate: template<class _Iterator> decltype ((__x.base() - __y.base())) std::operator-(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&)
     operator-(const reverse_iterator<_Iterator>& __x,
     ^~~~~~~~
/usr/include/c++/6/bits/stl_iterator.h:333:5: note:   template argument deduction/substitution failed:
prog.cpp:10:24: note:   ‘std::map<int, int>::iterator {aka std::_Rb_tree_iterator<std::pair<const int, int> >}’ is not derived from ‘const std::reverse_iterator<_Iterator>’
  cout << it - mp.begin() << endl;
                        ^
In file included from /usr/include/c++/6/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/6/bits/char_traits.h:39,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from /usr/include/c++/6/complex:45,
                 from /usr/include/c++/6/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_iterator.h:387:5: note: candidate: template<class _IteratorL, class _IteratorR> decltype ((__y.base() - __x.base())) std::operator-(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)
     operator-(const reverse_iterator<_IteratorL>& __x,
     ^~~~~~~~
/usr/include/c++/6/bits/stl_iterator.h:387:5: note:   template argument deduction/substitution failed:
prog.cpp:10:24: note:   ‘std::map<int, int>::iterator {aka std::_Rb_tree_iterator<std::pair<const int, int> >}’ is not derived from ‘const std::reverse_iterator<_Iterator>’
  cout << it - mp.begin() << endl;
                        ^
In file included from /usr/include/c++/6/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/6/bits/char_traits.h:39,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from /usr/include/c++/6/complex:45,
                 from /usr/include/c++/6/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_iterator.h:1186:5: note: candidate: template<class _IteratorL, class _IteratorR> decltype ((__x.base() - __y.base())) std::operator-(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorR>&)
     operator-(const move_iterator<_IteratorL>& __x,
     ^~~~~~~~
/usr/include/c++/6/bits/stl_iterator.h:1186:5: note:   template argument deduction/substitution failed:
prog.cpp:10:24: note:   ‘std::map<int, int>::iterator {aka std::_Rb_tree_iterator<std::pair<const int, int> >}’ is not derived from ‘const std::move_iterator<_IteratorL>’
  cout << it - mp.begin() << endl;
                        ^
In file included from /usr/include/c++/6/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/6/bits/char_traits.h:39,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from /usr/include/c++/6/complex:45,
                 from /usr/include/c++/6/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_iterator.h:1193:5: note: candidate: template<class _Iterator> decltype ((__x.base() - __y.base())) std::operator-(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorL>&)
     operator-(const move_iterator<_Iterator>& __x,
     ^~~~~~~~
/usr/include/c++/6/bits/stl_iterator.h:1193:5: note:   template argument deduction/substitution failed:
prog.cpp:10:24: note:   ‘std::map<int, int>::iterator {aka std::_Rb_tree_iterator<std::pair<const int, int> >}’ is not derived from ‘const std::move_iterator<_IteratorL>’
  cout << it - mp.begin() << endl;
                        ^
In file included from /usr/include/c++/6/ccomplex:39:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52,
                 from prog.cpp:1:
/usr/include/c++/6/complex:356:5: note: candidate: template<class _Tp> std::complex<_Tp> std::operator-(const std::complex<_Tp>&, const std::complex<_Tp>&)
     operator-(const complex<_Tp>& __x, const complex<_Tp>& __y)
     ^~~~~~~~
/usr/include/c++/6/complex:356:5: note:   template argument deduction/substitution failed:
prog.cpp:10:24: note:   ‘std::map<int, int>::iterator {aka std::_Rb_tree_iterator<std::pair<const int, int> >}’ is not derived from ‘const std::complex<_Tp>’
  cout << it - mp.begin() << endl;
                        ^
In file included from /usr/include/c++/6/ccomplex:39:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52,
                 from prog.cpp:1:
/usr/include/c++/6/complex:365:5: note: candidate: template<class _Tp> std::complex<_Tp> std::operator-(const std::complex<_Tp>&, const _Tp&)
     operator-(const complex<_Tp>& __x, const _Tp& __y)
     ^~~~~~~~
/usr/include/c++/6/complex:365:5: note:   template argument deduction/substitution failed:
prog.cpp:10:24: note:   ‘std::map<int, int>::iterator {aka std::_Rb_tree_iterator<std::pair<const int, int> >}’ is not derived from ‘const std::complex<_Tp>’
  cout << it - mp.begin() << endl;
                        ^
In file included from /usr/include/c++/6/ccomplex:39:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52,
                 from prog.cpp:1:
/usr/include/c++/6/complex:374:5: note: candidate: template<class _Tp> std::complex<_Tp> std::operator-(const _Tp&, const std::complex<_Tp>&)
     operator-(const _Tp& __x, const complex<_Tp>& __y)
     ^~~~~~~~
/usr/include/c++/6/complex:374:5: note:   template argument deduction/substitution failed:
prog.cpp:10:24: note:   ‘std::map<int, int>::iterator {aka std::_Rb_tree_iterator<std::pair<const int, int> >}’ is not derived from ‘const std::complex<_Tp>’
  cout << it - mp.begin() << endl;
                        ^
In file included from /usr/include/c++/6/ccomplex:39:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52,
                 from prog.cpp:1:
/usr/include/c++/6/complex:451:5: note: candidate: template<class _Tp> std::complex<_Tp> std::operator-(const std::complex<_Tp>&)
     operator-(const complex<_Tp>& __x)
     ^~~~~~~~
/usr/include/c++/6/complex:451:5: note:   template argument deduction/substitution failed:
prog.cpp:10:24: note:   ‘std::map<int, int>::iterator {aka std::_Rb_tree_iterator<std::pair<const int, int> >}’ is not derived from ‘const std::complex<_Tp>’
  cout << it - mp.begin() << endl;
                        ^
In file included from /usr/include/c++/6/deque:64:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:68,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_deque.h:349:5: note: candidate: template<class _Tp, class _Ref, class _Ptr> typename std::_Deque_iterator<_Tp, _Ref, _Ptr>::difference_type std::operator-(const std::_Deque_iterator<_Tp, _Ref, _Ptr>&, const std::_Deque_iterator<_Tp, _Ref, _Ptr>&)
     operator-(const _Deque_iterator<_Tp, _Ref, _Ptr>& __x,
     ^~~~~~~~
/usr/include/c++/6/bits/stl_deque.h:349:5: note:   template argument deduction/substitution failed:
prog.cpp:10:24: note:   ‘std::map<int, int>::iterator {aka std::_Rb_tree_iterator<std::pair<const int, int> >}’ is not derived from ‘const std::_Deque_iterator<_Tp, _Ref, _Ptr>’
  cout << it - mp.begin() << endl;
                        ^
In file included from /usr/include/c++/6/deque:64:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:68,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_deque.h:361:5: note: candidate: template<class _Tp, class _RefL, class _PtrL, class _RefR, class _PtrR> typename std::_Deque_iterator<_Tp, _Ref, _Ptr>::difference_type std::operator-(const std::_Deque_iterator<_Tp, _Ref, _Ptr>&, const std::_Deque_iterator<_Tp, _RefR, _PtrR>&)
     operator-(const _Deque_iterator<_Tp, _RefL, _PtrL>& __x,
     ^~~~~~~~
/usr/include/c++/6/bits/stl_deque.h:361:5: note:   template argument deduction/substitution failed:
prog.cpp:10:24: note:   ‘std::map<int, int>::iterator {aka std::_Rb_tree_iterator<std::pair<const int, int> >}’ is not derived from ‘const std::_Deque_iterator<_Tp, _Ref, _Ptr>’
  cout << it - mp.begin() << endl;
                        ^
In file included from /usr/include/c++/6/vector:65:0,
                 from /usr/include/c++/6/queue:61,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:86,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_bvector.h:208:3: note: candidate: std::ptrdiff_t std::operator-(const std::_Bit_iterator_base&, const std::_Bit_iterator_base&)
   operator-(const _Bit_iterator_base& __x, const _Bit_iterator_base& __y)
   ^~~~~~~~
/usr/include/c++/6/bits/stl_bvector.h:208:3: note:   no known conversion for argument 1 from ‘std::map<int, int>::iterator {aka std::_Rb_tree_iterator<std::pair<const int, int> >}’ to ‘const std::_Bit_iterator_base&’
In file included from /usr/include/c++/6/valarray:587:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:95,
                 from prog.cpp:1:
/usr/include/c++/6/bits/valarray_after.h:403:5: note: candidate: template<class _Dom1, class _Dom2> std::_Expr<std::_BinClos<std::__minus, std::_Expr, std::_Expr, _Dom1, _Dom2>, typename std::__fun<std::__minus, typename _Dom1::value_type>::result_type> std::operator-(const std::_Expr<_Dom1, typename _Dom1::value_type>&, const std::_Expr<_Dom2, typename _Dom2::value_type>&)
     _DEFINE_EXPR_BINARY_OPERATOR(-, __minus)
     ^
/usr/include/c++/6/bits/valarray_after.h:403:5: note:   template argument deduction/substitution failed:
prog.cpp:10:24: note:   ‘std::map<int, int>::iterator {aka std::_Rb_tree_iterator<std::pair<const int, int> >}’ is not derived from ‘const std::_Expr<_Dom1, typename _Dom1::value_type>’
  cout << it - mp.begin() << endl;
                        ^
In file included from /usr/include/c++/6/valarray:587:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:95,
                 from prog.cpp:1:
/usr/include/c++/6/bits/valarray_after.h:403:5: note: candidate: template<class _Dom> std::_Expr<std::_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 std::_Expr<_Dom1, typename _Dom1::value_type>&, const typename _Dom::value_type&)
     _DEFINE_EXPR_BINARY_OPERATOR(-, __minus)
     ^
/usr/include/c++/6/bits/valarray_after.h:403:5: note:   template argument deduction/substitution failed:
prog.cpp:10:24: note:   ‘std::map<int, int>::iterator {aka std::_Rb_tree_iterator<std::pair<const int, int> >}’ is not derived from ‘const std::_Expr<_Dom1, typename _Dom1::value_type>’
  cout << it - mp.begin() << endl;
                        ^
In file included from /usr/include/c++/6/valarray:587:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:95,
                 from prog.cpp:1:
/usr/include/c++/6/bits/valarray_after.h:403:5: note: candidate: template<class _Dom> std::_Expr<std::_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 std::_Expr<_Dom1, typename _Dom1::value_type>&)
     _DEFINE_EXPR_BINARY_OPERATOR(-, __minus)
     ^
/usr/include/c++/6/bits/valarray_after.h:403:5: note:   template argument deduction/substitution failed:
prog.cpp:10:24: note:   ‘std::map<int, int>::iterator {aka std::_Rb_tree_iterator<std::pair<const int, int> >}’ is not derived from ‘const std::_Expr<_Dom1, typename _Dom1::value_type>’
  cout << it - mp.begin() << endl;
                        ^
In file included from /usr/include/c++/6/valarray:587:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:95,
                 from prog.cpp:1:
/usr/include/c++/6/bits/valarray_after.h:403:5: note: candidate: template<class _Dom> std::_Expr<std::_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 std::_Expr<_Dom1, typename _Dom1::value_type>&, const std::valarray<typename _Dom::value_type>&)
     _DEFINE_EXPR_BINARY_OPERATOR(-, __minus)
     ^
/usr/include/c++/6/bits/valarray_after.h:403:5: note:   template argument deduction/substitution failed:
prog.cpp:10:24: note:   ‘std::map<int, int>::iterator {aka std::_Rb_tree_iterator<std::pair<const int, int> >}’ is not derived from ‘const std::_Expr<_Dom1, typename _Dom1::value_type>’
  cout << it - mp.begin() << endl;
                        ^
In file included from /usr/include/c++/6/valarray:587:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:95,
                 from prog.cpp:1:
/usr/include/c++/6/bits/valarray_after.h:403:5: note: candidate: template<class _Dom> std::_Expr<std::_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 std::valarray<typename _Dom::value_type>&, const std::_Expr<_Dom1, typename _Dom1::value_type>&)
     _DEFINE_EXPR_BINARY_OPERATOR(-, __minus)
     ^
/usr/include/c++/6/bits/valarray_after.h:403:5: note:   template argument deduction/substitution failed:
prog.cpp:10:24: note:   ‘std::map<int, int>::iterator {aka std::_Rb_tree_iterator<std::pair<const int, int> >}’ is not derived from ‘const std::_Expr<_Dom1, typename _Dom1::value_type>’
  cout << it - mp.begin() << endl;
                        ^
In file included from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:95:0,
                 from prog.cpp:1:
/usr/include/c++/6/valarray:1168:1: note: candidate: template<class _Tp> std::_Expr<std::_BinClos<std::__minus, std::_ValArray, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__minus, _Tp>::result_type> std::operator-(const std::valarray<_Tp>&, const std::valarray<_Tp>&)
 _DEFINE_BINARY_OPERATOR(-, __minus)
 ^
/usr/include/c++/6/valarray:1168:1: note:   template argument deduction/substitution failed:
prog.cpp:10:24: note:   ‘std::map<int, int>::iterator {aka std::_Rb_tree_iterator<std::pair<const int, int> >}’ is not derived from ‘const std::valarray<_Tp>’
  cout << it - mp.begin() << endl;
                        ^
In file included from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:95:0,
                 from prog.cpp:1:
/usr/include/c++/6/valarray:1168:1: note: candidate: template<class _Tp> std::_Expr<std::_BinClos<std::__minus, std::_ValArray, std::_Constant, _Tp, _Tp>, typename std::__fun<std::__minus, _Tp>::result_type> std::operator-(const std::valarray<_Tp>&, const _Tp&)
 _DEFINE_BINARY_OPERATOR(-, __minus)
 ^
/usr/include/c++/6/valarray:1168:1: note:   template argument deduction/substitution failed:
prog.cpp:10:24: note:   ‘std::map<int, int>::iterator {aka std::_Rb_tree_iterator<std::pair<const int, int> >}’ is not derived from ‘const std::valarray<_Tp>’
  cout << it - mp.begin() << endl;
                        ^
In file included from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:95:0,
                 from prog.cpp:1:
/usr/include/c++/6/valarray:1168:1: note: candidate: template<class _Tp> std::_Expr<std::_BinClos<std::__minus, std::_Constant, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__minus, _Tp>::result_type> std::operator-(const _Tp&, const std::valarray<_Tp>&)
 _DEFINE_BINARY_OPERATOR(-, __minus)
 ^
/usr/include/c++/6/valarray:1168:1: note:   template argument deduction/substitution failed:
prog.cpp:10:24: note:   ‘std::map<int, int>::iterator {aka std::_Rb_tree_iterator<std::pair<const int, int> >}’ is not derived from ‘const std::valarray<_Tp>’
  cout << it - mp.begin() << endl;
                        ^

Standard output is empty