Language: C++

#include<iostream>
#include<algorithm>
using lint=int64_t;
using namespace std;

/* gcd */
template<typename T>
T gcd(T a,T b)
{
	if(a==0 || b==0)return 0;
	if(b<a)swap(a,b);
	T r;
	while(1)
	{
		r=a%b;
		if(r==0)break;
		a=b;
		b=r;
	}
	return b;
}

/* lcm */
template<typename T>
T lcm(T a,T b)
{
	if(a==0 || b==0)return 0;
	return a*(b/gcd(a,b));
}

int main()
{
	lint A,B,C,D;
	lint ans=0;

	cin >> A >> B;
	cin >> C >> D;

	lint L,R;
	L=(A+C+1)/C;
	R=B/C;
	ans+=max(0LL,R-L+1);
	L=(A+D+1)/D;
	R=B/D;
	ans+=max(0LL,R-L+1);

	lint LCM=lcm(C,D);
	L=(A+LCM+1)/LCM;
	R=B/LCM;
	ans-=max(0LL,R-L+1);

	ans=(B-A+1)-ans;
	cout << ans << endl;

	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:42:17: error: no matching function for call to 'max(long long int, lint)'
   42 |         ans+=max(0LL,R-L+1);
      |              ~~~^~~~~~~~~~~
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:1:
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:42:17: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'lint' {aka 'long int'})
   42 |         ans+=max(0LL,R-L+1);
      |              ~~~^~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61,
                 from a.cc:2:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:42:17: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   42 |         ans+=max(0LL,R-L+1);
      |              ~~~^~~~~~~~~~~
a.cc:45:17: error: no matching function for call to 'max(long long int, lint)'
   45 |         ans+=max(0LL,R-L+1);
      |              ~~~^~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:45:17: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'lint' {aka 'long int'})
   45 |         ans+=max(0LL,R-L+1);
      |              ~~~^~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:45:17: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   45 |         ans+=max(0LL,R-L+1);
      |              ~~~^~~~~~~~~~~
a.cc:50:17: error: no matching function for call to 'max(long long int, lint)'
   50 |         ans-=max(0LL,R-L+1);
      |              ~~~^~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:50:17: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'lint' {aka 'long int'})
   50 |         ans-=max(0LL,R-L+1);
      |              ~~~^~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:50:17: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   50 |         ans-=max(0LL,R-L+1);
      |              ~~~^~~~~~~~~~~