Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef struct node
{
	int color,x,y;
	bool operator < (const struct node t) const
	{
		return y<t.y;	
	}
}NODE,*PNODE;
NODE a[202];
list<NODE> redlist;
int main()
{
	int n,i,ans=0;
	scanf("%d",&n);
	for(i=0;i<n;i++)
	{
		scanf("%d %d",&a[i].x,&a[i].y);
		a[i].color=0;
	}
	for(i=n;i<2*n;i++)
	{
		scanf("%d %d",&a[i].x,&a[i].y);
		a[i].color=1;
	}
	sort(a,a+2*n);
	for(i=0;i<2*n;i++)
	{
		if(a[i].color==0)
		{
			redlist.insert(low_bound(redlist.begin(),redlist.end(),a[i]),a[i]);
		}
		else
		{
			int pos=low_bound(redlist.begin(),redlist.end(),a[i]);
			if(pos>0)
			{
				redlist.erase(redlist.begin()+pos-1);
				ans++;
			}
		}
	}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:32:40: error: 'low_bound' was not declared in this scope
   32 |                         redlist.insert(low_bound(redlist.begin(),redlist.end(),a[i]),a[i]);
      |                                        ^~~~~~~~~
a.cc:36:33: error: 'low_bound' was not declared in this scope
   36 |                         int pos=low_bound(redlist.begin(),redlist.end(),a[i]);
      |                                 ^~~~~~~~~
a.cc:39:62: error: no match for 'operator+' (operand types are 'std::__cxx11::list<node>::iterator' and 'int')
   39 |                                 redlist.erase(redlist.begin()+pos-1);
      |                                               ~~~~~~~~~~~~~~~^~~~
      |                                                            |  |
      |                                                            |  int
      |                                                            std::__cxx11::list<node>::iterator
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:627:5: note: candidate: 'template<class _Iterator> constexpr std::reverse_iterator<_Iterator> std::operator+(typename reverse_iterator<_Iterator>::difference_type, const reverse_iterator<_Iterator>&)'
  627 |     operator+(typename reverse_iterator<_Iterator>::difference_type __n,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:627:5: note:   template argument deduction/substitution failed:
a.cc:39:63: note:   mismatched types 'const std::reverse_iterator<_Iterator>' and 'int'
   39 |                                 redlist.erase(redlist.begin()+pos-1);
      |                                                               ^~~
/usr/include/c++/14/bits/stl_iterator.h:1798:5: note: candidate: 'template<class _Iterator> constexpr std::move_iterator<_IteratorL> std::operator+(typename move_iterator<_IteratorL>::difference_type, const move_iterator<_IteratorL>&)'
 1798 |     operator+(typename move_iterator<_Iterator>::difference_type __n,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1798:5: note:   template argument deduction/substitution failed:
a.cc:39:63: note:   mismatched types 'const std::move_iterator<_IteratorL>' and 'int'
   39 |                                 redlist.erase(redlist.begin()+pos-1);
      |                                                               ^~~
In file included from /usr/include/c++/14/string:54,
                 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/basic_string.h:3598:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3598 |     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3598:5: note:   template argument deduction/substitution failed:
a.cc:39:63: note:   'std::__cxx11::list<node>::iterator' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   39 |                                 redlist.erase(redlist.begin()+pos-1);
      |                                                               ^~~
/usr/include/c++/14/bits/basic_string.h:3616:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const _CharT*, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3616 |     operator+(const _CharT* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3616:5: note:   template argument deduction/substitution failed:
a.cc:39:63: note:   mismatched types 'const _CharT*' and 'std::_List_iterator<node>'
   39 |                                 redlist.erase(redlist.begin()+pos-1);
      |                                                               ^~~
/usr/include/c++/14/bits/basic_string.h:3635:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(_CharT, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3635 |     operator+(_CharT __lhs, const basic_string<_CharT,_Traits,_Alloc>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3635:5: note:   template argument deduction/substitution failed:
a.cc:39:63: note:   mismatched types 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>' and 'int'
   39 |                                 redlist.erase(redlist.begin()+pos-1);
      |                                                               ^~~
/usr/include/c++/14/bits/basic_string.h:3652:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const _CharT*)'
 3652 |     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3652:5: note:   template argument deduction/substitution failed:
a.cc:39:63: note:   'std::__cxx11::list<node>::iterator' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   39 |                                 redlist.erase(redlist.begin()+pos-1);
      |                                                               ^~~
/usr/include/c++/14/bits/basic_string.h:3670:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, _CharT)'
 3670 |     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs, _CharT __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3670:5: note:   template argument deduction/substitution failed:
a.cc:39:63: note:   'std::__cxx11::list<node>::iterator' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   39 |                                 redlist.erase(redlist.begin()+pos-1);
      |                                                               ^~~
/usr/include/c++/14/bits/basic_string.h:3682:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(__cxx11::basic_string<_CharT, _Traits, _Allocator>&&, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3682 |     operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3682:5: note:   template argument deduction/substitution failed:
a.cc:39:63: note:   'std::__cxx11::list<node>::iterator' is not derived from 'std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   39 |                                 redlist.erase(redlist.begin()+pos-1);
      |                                                               ^~~
/usr/include/c++/14/bits/basic_string.h:3689:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, __cxx11::basic_string<_CharT, _Traits, _Allocator>&&)'
 3689 |     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3689:5: note:   template argument deduction/substitution failed:
a.cc:39:63: note:   'std::__cxx11::list<node>::iterator' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   39 |                                 redlist.erase(redlist.begin()+pos-1);
      |                                                               ^~~
/usr/include/c++/14/bits/basic_string.h:3696:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(__cxx11::basic_string<_CharT, _Traits, _Allocator>&&, __cxx11::basic_string<_CharT, _Traits, _Allocator>&&)'
 3696 |     operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3696:5: note:   template argument deduction/substitution failed:
a.cc:39:63: note:   'std::__cxx11::list<node>::iterator' is not derived from 'std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   39 |                                 redlist.erase(redlist.begin()+pos-1);
      |                                                               ^~~
/usr/include/c++/14/bits/basic_string.h:3719:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const _CharT*, __cxx11::basic_string<_CharT, _Traits, _Allocator>&&)'
 3719 |     operator+(const _CharT* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3719:5: note:   template argument deduction/substitution failed:
a.cc:39:63: note:   mismatched types 'const _CharT*' and 'std::_List_iterator<node>'
   39 |                                 redlist.erase(redlist.begin()+pos-1);
      |                                                               ^~~
/usr/include/c++/14/bits/basic_string.h:3726:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(_CharT, __cxx11::basic_string<_CharT, _Traits, _Allocator>&&)'
 3726 |     operator+(_CharT __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3726:5: note:   template argument deduction/substitution failed:
a.cc:39:63: note:   mismatched types 'std::__cxx11::basic_string<_CharT, _Traits, _Allocator>' and 'int'
   39 |                                 redlist.erase(redlist.begin()+pos-1);
      |                                                               ^~~
/usr/include/c++/14/bits/basic_string.h:3733:5: note: candidate: 'template<class _