Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
long n,k,i,x=0;
cin>>n>>k;
for(i=1;i<=n;i++)x+=max(0,(n/i)*(i-k))+max(0,n%i-k+1);
if(k==0)cout<<n*n;
else cout<<x;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:24: error: no matching function for call to 'max(int, long int)'
    6 | for(i=1;i<=n;i++)x+=max(0,(n/i)*(i-k))+max(0,n%i-k+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: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:6:24: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long int')
    6 | for(i=1;i<=n;i++)x+=max(0,(n/i)*(i-k))+max(0,n%i-k+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:
/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:6:24: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
    6 | for(i=1;i<=n;i++)x+=max(0,(n/i)*(i-k))+max(0,n%i-k+1);
      |                     ~~~^~~~~~~~~~~~~~~
a.cc:6:43: error: no matching function for call to 'max(int, long int)'
    6 | for(i=1;i<=n;i++)x+=max(0,(n/i)*(i-k))+max(0,n%i-k+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:6:43: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long int')
    6 | for(i=1;i<=n;i++)x+=max(0,(n/i)*(i-k))+max(0,n%i-k+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:6:43: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
    6 | for(i=1;i<=n;i++)x+=max(0,(n/i)*(i-k))+max(0,n%i-k+1);
      |                                        ~~~^~~~~~~~~~~