Language: C++

#include <iostream>
#include<string>
#include <cstdio>
#include<utility>
#include<algorithm>
#include<vector>
#include<cmath>
#include<map>
#include<bitset>
#include<queue>
#include<set>
#include <limits>
#include <numeric>
#include <type_traits>
#include<queue>
using namespace std;
typedef long long ll;
typedef pair<int,int>P;
typedef pair<double,double>P_D;
#define PI 3.1415926535897932384626433832795
#define rep(i, n) for (int i = 0; i < (int)n; i++)
#define reprev(i, n) for (int i = (int)n - 1; i >= 0; i--)
#define ALL(a)  (a).begin(),(a).end()
#define MAX 100100
#define MAX_N 200100
#define SENTINEL 2000000000
#define MAX_B 1001001
#define NIL -1
#define MOD 1000000007
#define INF 1 << 29
#define INFTY 1000000000000000000LL
int main(){
    int n;cin>>n;
    vector<P>p(n);
    rep(i,n){
        int x,l;cin>>x>>l;
        p[i]=make_pair(x-l,x+l);
    }
    sort(ALL(p));
    int ans=0,now=0;
    for(int i=1;i<n;i++){
        if(p[now].first<p[i]first && p[i].first<p[now].second ){
            ans++;
        }
        else{
            now=i;
        }
    }
    cout<<n-ans<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:42:24: error: no match for 'operator<' (operand types are 'int' and '__gnu_cxx::__alloc_traits<std::allocator<std::pair<int, int> >, std::pair<int, int> >::value_type' {aka 'std::pair<int, int>'})
   42 |         if(p[now].first<p[i]first && p[i].first<p[now].second ){
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:448:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator<(const reverse_iterator<_Iterator>&, const reverse_iterator<_Iterator>&)'
  448 |     operator<(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:448:5: note:   template argument deduction/substitution failed:
a.cc:42:28: note:   mismatched types 'const std::reverse_iterator<_Iterator>' and 'int'
   42 |         if(p[now].first<p[i]first && p[i].first<p[now].second ){
      |                            ^
/usr/include/c++/14/bits/stl_iterator.h:493:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator<(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
  493 |     operator<(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:493:5: note:   template argument deduction/substitution failed:
a.cc:42:28: note:   mismatched types 'const std::reverse_iterator<_Iterator>' and 'int'
   42 |         if(p[now].first<p[i]first && p[i].first<p[now].second ){
      |                            ^
/usr/include/c++/14/bits/stl_iterator.h:1694:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator<(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)'
 1694 |     operator<(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1694:5: note:   template argument deduction/substitution failed:
a.cc:42:28: note:   mismatched types 'const std::move_iterator<_IteratorL>' and 'int'
   42 |         if(p[now].first<p[i]first && p[i].first<p[now].second ){
      |                            ^
/usr/include/c++/14/bits/stl_iterator.h:1760:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator<(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)'
 1760 |     operator<(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1760:5: note:   template argument deduction/substitution failed:
a.cc:42:28: note:   mismatched types 'const std::move_iterator<_IteratorL>' and 'int'
   42 |         if(p[now].first<p[i]first && p[i].first<p[now].second ){
      |                            ^
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:1045:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator<(const pair<_T1, _T2>&, const pair<_T1, _T2>&)'
 1045 |     operator<(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_pair.h:1045:5: note:   template argument deduction/substitution failed:
a.cc:42:28: note:   mismatched types 'const std::pair<_T1, _T2>' and 'int'
   42 |         if(p[now].first<p[i]first && p[i].first<p[now].second ){
      |                            ^
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:673:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator<(basic_string_view<_CharT, _Traits>, basic_string_view<_CharT, _Traits>)'
  673 |     operator< (basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:673:5: note:   template argument deduction/substitution failed:
a.cc:42:28: note:   mismatched types 'std::basic_string_view<_CharT, _Traits>' and 'int'
   42 |         if(p[now].first<p[i]first && p[i].first<p[now].second ){
      |                            ^
/usr/include/c++/14/string_view:680:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator<(basic_string_view<_CharT, _Traits>, __type_identity_t<basic_string_view<_CharT, _Traits> >)'
  680 |     operator< (basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:680:5: note:   template argument deduction/substitution failed:
a.cc:42:28: note:   mismatched types 'std::basic_string_view<_CharT, _Traits>' and 'int'
   42 |         if(p[now].first<p[i]first && p[i].first<p[now].second ){
      |                            ^
/usr/include/c++/14/string_view:688:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator<(__type_identity_t<basic_string_view<_CharT, _Traits> >, basic_string_view<_CharT, _Traits>)'
  688 |     operator< (__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:688:5: note:   template argument deduction/substitution failed:
a.cc:42:28: note:   'std::pair<int, int>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   42 |         if(p[now].first<p[i]first && p[i].first<p[now].second ){
      |                            ^
/usr/include/c++/14/bits/basic_string.h:3874:5: 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>&)'
 3874 |     operator<(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3874:5: note:   template argument deduction/substitution failed:
a.cc:42:28: note:   mismatched types 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>' and 'int'
   42 |         if(p[now].first<p[i]first && p[i].first<p[now].second ){
      |                            ^
/usr/include/c++/14/bits/basic_string.h:3888:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator<(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const _CharT*)'
 3888 |     operator<(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3888:5: note:   template argument deduction/substitution failed:
a.cc:42:28: note:   mismatched types 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>' and 'int'
   42 |         if(p[now].first<p[i]first && p[i].first<p[now].second ){
      |                            ^
/usr/include/c++/14/bits/basic_string.h:3901:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator<(const _CharT*, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3901 |     operator<(const _CharT* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3901:5: note:   template argument deduction/substitution failed:
a.cc:42:28: note:   mismatched types 'const _CharT*' and 'int'
   42 |         if(p[now].first<p[i]first && p[i].first<p[now].second ){
      |                            ^
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:2600:5: note: candidate: 'template<class ... _TElements, class ... _UElements> constexpr bool std::operator<(const tuple<_UTypes ...>&, const tuple<_Elements ...>&)'
 2600 |     operator<(const tuple<_TElements...>& __t,
      |     ^~~~~~~~
/usr/include/c++/14/tuple:2600:5: note:   template argument deduction/substitution failed:
a.cc:42:28: note:   mismatched types 'const std::tuple<_UTypes ...>' and 'int'
   42 |         if(p[now].first<p[i]first && p[i].first<p[now].second ){
      |                            ^
In file included from /usr/include/c++/14/vector:66,
                 from a.cc:6:
/usr/include/c++/14/bits/stl_vector.h:2089:5: note: candidate: 'template<class _Tp, class _Alloc> bool std::operator<(const vector<_Tp, _Alloc>&, const vector<_Tp, _Alloc>&)'
 2089 |     operator<(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_vector.h:2089:5: note:   template argument deduction/substitution failed:
a.cc:42:28: note:   mismatched types 'const std::vector<_Tp, _Alloc>' and 'int'
   42 |         if(p[now].first<p[i]first && p[i].first<p[now].second ){
      |                            ^
In file included from /usr/include/c++/14/map:63,
                 from a.cc:8:
/usr/include/c++/14/bits/stl_map.h:1550:5: note: candidate: 'template<class _Key, class _Tp, class _Compare, class _Alloc> bool std::operator<(const map<_Key, _Tp, _Compare, _Allocator>&, const map<_Key, _Tp, _Compare, _Allocator>&)'
 1550 |     operator<(const map<_Key, _Tp, _Compare, _Alloc>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_map.h:1550:5: note:   template argument deduction/substitution failed:
a.cc:42:28: note:   mismatched types 'const std::map<_Key, _Tp, _Compare, _Allocator>' and 'int'
   42 |         if(p[now].first<p[i]first && p[i].first<p[now].second ){
      |                            ^
In file included from /usr/include/c++/14/map:64:
/usr/include/c++/14/bits/stl_multimap.h:1172:5: note: candidate: 'template<class _Key, class _Tp, class _Compare, class _Alloc> bool std::operator<(const multimap<_Key, _Tp, _Compare, _Allocator>&, const multimap<_Key, _Tp, _Compare, _Allocator>&)'
 1172 |     operator<(const multimap<_Key, _Tp, _Compare, _Alloc>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_multimap.h:1172:5: note:   template argument deduction/substitution failed:
a.cc:42:28: note:   mismatched types 'const std::multimap<_Key, _Tp, _Compare, _Allocator>' and 'int'
   42 |         if(p[now].first<p[i]first && p[i].first<p[now].second ){
      |                            ^
In file in