Language: C++

/*
*          Name : chaitanya
*
*     Institute : ANITS,Visakhapatnam
*
*/
#include<cstdio>
#include <iostream>
#include<sstream>
#include<fstream>
#include<iomanip>
#include<algorithm>
#include<cmath>
#include<complex>
#include <cstring>
#include<vector>
#include<list>
#include<queue>
#include<stack>
#include<set>
#include<map>
#include<bitset>
#include<numeric>
#include<limits>
#include<climits>
#include<cfloat>
#include<functional>
#include<iterator>
#include <random>
#define inf  1000000000
#define mod  1e9+1
#pragma GCC optimization ("O3")
using namespace std;
const long long int N = 6999999;
#define all(x) begin(x),end(x)
int main()
{
 
  // freopen("input.txt","r",stdin);
  // freopen("output.txt","w",stdout);
  //ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
  int l,r,mod = 2019;
  cin >> l >> r;
  for (int i = l; i <= r; ++i)
  {
    if(i % 2019 == 0 )
    {
      cout << 0;
      return 0;
    }
  }
  l 5= 2019;
  r %= 2019;
  for(int i=l;i<=r;i++)
  {
    for(int j= i+1;j<=r;j++)
    {
      if(i==j)continue;
      mod=min(mod,(i*j)%2019);
    }
  }
  cout << mod <<endl;
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:31:14: error: expected unqualified-id before numeric constant
   31 | #define mod  1e9+1
      |              ^~~
a.cc:42:11: note: in expansion of macro 'mod'
   42 |   int l,r,mod = 2019;
      |           ^~~
a.cc:52:4: error: expected ';' before numeric constant
   52 |   l 5= 2019;
      |    ^~
      |    ;
a.cc:59:14: error: no matching function for call to 'min(double, int)'
   59 |       mod=min(mod,(i*j)%2019);
      |           ~~~^~~~~~~~~~~~~~~~
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:8:
/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:59:14: note:   deduced conflicting types for parameter 'const _Tp' ('double' and 'int')
   59 |       mod=min(mod,(i*j)%2019);
      |           ~~~^~~~~~~~~~~~~~~~
/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:12:
/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:59:14: note:   mismatched types 'std::initializer_list<_Tp>' and 'double'
   59 |       mod=min(mod,(i*j)%2019);
      |           ~~~^~~~~~~~~~~~~~~~