Language: C++

// RemainderMinimization.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <iostream>
#include <algorithm>
using namespace std;
int main()
{
	long long a;
	long long b;
	cin >> a >> b;
	a %= 4038;
	b %= 4038;
	int min1 = 2018;
	a = min(a, b);
	b = max(a, b);
	for (long long i = a; i <= b; i++) {
		for (long long j = a + 1; j <= b; j++) {
			min1 = min((i * j) % 2019, min1);
		}
	}
	cout << min1 << endl;
}

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Compiler output:
a.cc: In function 'int main()':
a.cc:19:35: error: no matching function for call to 'min(long long int, int&)'
   19 |                         min1 = min((i * j) % 2019, min1);
      |                                ~~~^~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/string:51,
                 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:4:
/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:19:35: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   19 |                         min1 = min((i * j) % 2019, min1);
      |                                ~~~^~~~~~~~~~~~~~~~~~~~~~
/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,
                 from a.cc:5:
/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:19:35: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   19 |                         min1 = min((i * j) % 2019, min1);
      |                                ~~~^~~~~~~~~~~~~~~~~~~~~~