Language: C++

#include <bits/stdc++.h>
#include <algorithm>
using namespace std;
 
long long gcd(long long a,long long b){
  if(b == 0) return a;
  return gcd(b,a%b);
}

long long lcm(long long a,long long b){
  long long g = gcd(a,b);
  return a/g*b;
}

int main(){
  
  long long int a,b,c,d;
  cin >>a >> b;
  
  if(a%2019 == 0){
    cout << '0' << endl;
    
    return 0;
  }
  c = 1e9;
  
  if(b-a < 2019){
    for(int i=a;i<b;i++){
      c = min(c,(i*(i+1)));
    }
  }
  
 else if(b-a >=2019){
    
for(int i=a;i<a+2019;i++){
  
   c = min(c,(i*(i+1)));
  
}
 
  
}

  cout << c << endl;
  
}
  
    


Compiler output:
a.cc: In function 'int main()':
a.cc:29:14: error: no matching function for call to 'min(long long int&, int)'
   29 |       c = min(c,(i*(i+1)));
      |           ~~~^~~~~~~~~~~~~
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:29:14: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   29 |       c = min(c,(i*(i+1)));
      |           ~~~^~~~~~~~~~~~~
/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:29:14: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   29 |       c = min(c,(i*(i+1)));
      |           ~~~^~~~~~~~~~~~~
a.cc:37:11: error: no matching function for call to 'min(long long int&, int)'
   37 |    c = min(c,(i*(i+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:37:11: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   37 |    c = min(c,(i*(i+1)));
      |        ~~~^~~~~~~~~~~~~
/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:37:11: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   37 |    c = min(c,(i*(i+1)));
      |        ~~~^~~~~~~~~~~~~