Language: C++

#include<iostream>
#include<algorithm>
#include<cstdio>
#include<cstring>
#include<cmath>
#include<map>
#include<queue>
#include<set>
#include<stack>
#include<string>
#include<sstream>
#include<vector>
#define inf 2147483647
#define rep(i,a,b) for(int i=a;i<b;i++)
#define  rr read()
#define ll long long
#define repb(i,a,b) for(int i=a;i<=b;i++)
#define CloseIo   ios_base::sync_with_stdio(false), cin.tie(0), cout.tie(0)
using namespace std;
int read()
{
    char ch = getchar();
	int x = 0, f = 1;
    while(ch < '0' || ch > '9') {if(ch == '-') f = -1; ch = getchar();}
    while('0' <= ch && ch <= '9') {x = x * 10 + ch - '0'; ch = getchar();}
    return x * f;
}
ll gcd(ll a,ll b)
{
	return (!b)?a:gcd(b,a%b);
}
int main()
{
 ll l,r;
 CloseIo;
 ll i=1;
 vector<ll>v;
 while(2019*i<=2*1e9)
 {
 	v.push_back(2019*i);
 	i++;
 }
 cin >> l >> r;
 
 ll pos=lower_bound(v.begin(),v.end(),l)-v.begin();
 ll pos1=lower_bound(v.begin(),v.end(),r)-v.begin();
 if(abs(pos1-pos)==1)
 {
 	cout<<1<"\n";
 	return 0;
 }
 else if(abs(pos1-pos)>1)
 {
 	cout<<0<<"\n";
 	return 0;
 }
 if(abs(v[pos]-l)==abs(v[pos+1]-r))
 {
 	cout<<abs(v[pos]-l)+abs(v[pos-1]-r)<<"\n";
 	return 0;
 }
 if(l*r<2019)
 {
 	cout<<l*(l+1)<<"\n";
 	return 0;
 }
 else
 {
 	cout<<(2019-r)*(2019-r-1);
 	return 0;
 }
 ll ans=min(abs(v[pos-1]-l),abs(v[pos]-r));
 //cout<<ans<<"\n";
 cout<<ans*(ans+1);
 
}




Compiler output:
a.cc: In function 'int main()':
a.cc:49:16: error: no match for 'operator<' (operand types are 'std::basic_ostream<char>' and 'const char [2]')
   49 |         cout<<1<"\n";
      |         ~~~~~~~^~~~~
      |             |   |
      |             |   const char [2]
      |             std::basic_ostream<char>
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:49:17: note:   'std::basic_ostream<char>' is not derived from 'const std::reverse_iterator<_Iterator>'
   49 |         cout<<1<"\n";
      |                 ^~~~
/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:49:17: note:   'std::basic_ostream<char>' is not derived from 'const std::reverse_iterator<_Iterator>'
   49 |         cout<<1<"\n";
      |                 ^~~~
/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:49:17: note:   'std::basic_ostream<char>' is not derived from 'const std::move_iterator<_IteratorL>'
   49 |         cout<<1<"\n";
      |                 ^~~~
/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:49:17: note:   'std::basic_ostream<char>' is not derived from 'const std::move_iterator<_IteratorL>'
   49 |         cout<<1<"\n";
      |                 ^~~~
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:49:17: note:   'std::basic_ostream<char>' is not derived from 'const std::pair<_T1, _T2>'
   49 |         cout<<1<"\n";
      |                 ^~~~
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:49:17: note:   'std::basic_ostream<char>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   49 |         cout<<1<"\n";
      |                 ^~~~
/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:49:17: note:   'std::basic_ostream<char>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   49 |         cout<<1<"\n";
      |                 ^~~~
/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:49:17: note:   mismatched types 'std::basic_string_view<_CharT, _Traits>' and 'const char*'
   49 |         cout<<1<"\n";
      |                 ^~~~
/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:49:17: note:   'std::basic_ostream<char>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   49 |         cout<<1<"\n";
      |                 ^~~~
/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:49:17: note:   'std::basic_ostream<char>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   49 |         cout<<1<"\n";
      |                 ^~~~
/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:49:17: note:   mismatched types 'const _CharT*' and 'std::basic_ostream<char>'
   49 |         cout<<1<"\n";
      |                 ^~~~
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:49:17: note:   'std::basic_ostream<char>' is not derived from 'const std::tuple<_UTypes ...>'
   49 |         cout<<1<"\n";
      |                 ^~~~
In file included from /usr/include/c++/14/map:63,
                 from a.cc:6:
/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:49:17: note:   'std::basic_ostream<char>' is not derived from 'const std::map<_Key, _Tp, _Compare, _Allocator>'
   49 |         cout<<1<"\n";
      |                 ^~~~
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:49:17: note:   'std::basic_ostream<char>' is not derived from 'const std::multimap<_Key, _Tp, _Compare, _Allocator>'
   49 |         cout<<1<"\n";
      |                 ^~~~
In file included from /usr/include/c++/14/deque:66,
                 from /usr/include/c++/14/queue:62,
                 from a.cc:7:
/usr/include/c++/14/bits/stl_deque.h:2334:5: note: candidate: 'template<class _Tp, class _Alloc> bool std::operator<(const deque<_Tp, _Alloc>&, const deque<_Tp, _Alloc>&)'
 2334 |     operator<(const deque<_Tp, _Alloc>& __x, const deque<_Tp, _Alloc>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_deque.h:2334:5: note:   template argument deduction/substitution failed:
a.cc:49:17: note:   'std::basic_ostream<char>' is not derived from 'const std::deque<_Tp, _Alloc>'
   49 |         cout<<1<"\n";
      |                 ^~~~
In file included from /usr/include/c++/14/vector:66,
                 from /usr/include/c++/14/queue:63:
/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 a