Language: C++

#include <iostream>
#include <algorithm>
#include <vector>
#include <map>
#include <set>
using namespace std;

int main() {
	int n;
	cin >> n;
	map <int, int> m;
	for (int i = 0; i < n; i++) {
		int pos, width;
		cin >> pos >> width;
		m[i] = (pos + width, pos - width);
	}
	sort(m.begin(), m.end());
	int cnt = 0, cur = -1001001001;
	for (int i = 0; i < n; i++) {
		if (cur <= m[i].second) {
			cnt++;
			cur = m[i].first;
		}
	}
	cout << cnt << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:20:33: error: request for member 'second' in 'm.std::map<int, int>::operator[](i)', which is of non-class type 'std::map<int, int>::mapped_type' {aka 'int'}
   20 |                 if (cur <= m[i].second) {
      |                                 ^~~~~~
a.cc:22:36: error: request for member 'first' in 'm.std::map<int, int>::operator[](i)', which is of non-class type 'std::map<int, int>::mapped_type' {aka 'int'}
   22 |                         cur = m[i].first;
      |                                    ^~~~~
In file included from /usr/include/c++/14/algorithm:61,
                 from a.cc:2:
/usr/include/c++/14/bits/stl_algo.h: In instantiation of 'void std::__sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = _Rb_tree_iterator<pair<const int, int> >; _Compare = __gnu_cxx::__ops::_Iter_less_iter]':
/usr/include/c++/14/bits/stl_algo.h:4772:18:   required from 'void std::sort(_RAIter, _RAIter) [with _RAIter = _Rb_tree_iterator<pair<const int, int> >]'
 4772 |       std::__sort(__first, __last, __gnu_cxx::__ops::__iter_less_iter());
      |       ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
a.cc:17:6:   required from here
   17 |         sort(m.begin(), m.end());
      |         ~~~~^~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algo.h:1906:50: error: no match for 'operator-' (operand types are 'std::_Rb_tree_iterator<std::pair<const int, int> >' and 'std::_Rb_tree_iterator<std::pair<const int, int> >')
 1906 |                                 std::__lg(__last - __first) * 2,
      |                                           ~~~~~~~^~~~~~~~~
In file included from /usr/include/c++/14/string:48,
                 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,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/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:
/usr/include/c++/14/bits/stl_algo.h:1906:50: note:   'std::_Rb_tree_iterator<std::pair<const int, int> >' is not derived from 'const std::reverse_iterator<_Iterator>'
 1906 |                                 std::__lg(__last - __first) * 2,
      |                                           ~~~~~~~^~~~~~~~~
/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:
/usr/include/c++/14/bits/stl_algo.h:1906:50: note:   'std::_Rb_tree_iterator<std::pair<const int, int> >' is not derived from 'const std::move_iterator<_IteratorL>'
 1906 |                                 std::__lg(__last - __first) * 2,
      |                                           ~~~~~~~^~~~~~~~~