Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
  long long l,r;
  cin>>l>>r;
  long long x,y;
  x=l%2019;
  y=r%2019;
  if(r-l+1>2019)
  {
    long long ans=1000000000;
    for(int i=0;i<2018;i++)
    {
      ans=min(i*(i+1),ans);
    }
    cout<<ans;
  }
  else
  {
    long long ans=1000000000;
    for(int i=x;i<y;i++) ans=min(i*(i+1),ans);
    cout<<ans;
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:14: error: no matching function for call to 'min(int, long long int&)'
   15 |       ans=min(i*(i+1),ans);
      |           ~~~^~~~~~~~~~~~~
In file included 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_algobase.h:233:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::min(const _Tp&, const _Tp&)'
  233 |     min(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note:   template argument deduction/substitution failed:
a.cc:15:14: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long long int')
   15 |       ans=min(i*(i+1),ans);
      |           ~~~^~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::min(const _Tp&, const _Tp&, _Compare)'
  281 |     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61:
/usr/include/c++/14/bits/stl_algo.h:5686:5: note: candidate: 'template<class _Tp> constexpr _Tp std::min(initializer_list<_Tp>)'
 5686 |     min(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5686:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5696:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::min(initializer_list<_Tp>, _Compare)'
 5696 |     min(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5696:5: note:   template argument deduction/substitution failed:
a.cc:15:14: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   15 |       ans=min(i*(i+1),ans);
      |           ~~~^~~~~~~~~~~~~
a.cc:22:33: error: no matching function for call to 'min(int, long long int&)'
   22 |     for(int i=x;i<y;i++) ans=min(i*(i+1),ans);
      |                              ~~~^~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::min(const _Tp&, const _Tp&)'
  233 |     min(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note:   template argument deduction/substitution failed:
a.cc:22:33: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long long int')
   22 |     for(int i=x;i<y;i++) ans=min(i*(i+1),ans);
      |                              ~~~^~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::min(const _Tp&, const _Tp&, _Compare)'
  281 |     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note:   candidate expects 3 arguments, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5686:5: note: candidate: 'template<class _Tp> constexpr _Tp std::min(initializer_list<_Tp>)'
 5686 |     min(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5686:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5696:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::min(initializer_list<_Tp>, _Compare)'
 5696 |     min(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5696:5: note:   template argument deduction/substitution failed:
a.cc:22:33: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   22 |     for(int i=x;i<y;i++) ans=min(i*(i+1),ans);
      |                              ~~~^~~~~~~~~~~~~