Language: C++

#include <bits/stdc++.h>
#define P pair<int,int>
#define All(v) (v).begin(), (v).end()
#define pb(x) push_back(x)
typedef long long ll;
using namespace std;
const int INF = 1e9 + 7, MOD = 1e9 + 7;
const ll LINF = 1e18;
int main() {
	long long n, k, ans = 0;
	cin >> n >> k;
	if (k == 0) {
		cout << n*n << endl;
		return 0;
	} else {
		for (int b = k + 1; b <= n; b++) {
			ans += (n / b) * (max(0, (b - k)));
			ans += max(0, ((n % b) - k + 1));
		}
		cout << ans << endl;
	}
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:17:46: error: no matching function for call to 'max(int, long long int)'
   17 |                         ans += (n / b) * (max(0, (b - k)));
      |                                           ~~~^~~~~~~~~~~~
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:17:46: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long long int')
   17 |                         ans += (n / b) * (max(0, (b - k)));
      |                                           ~~~^~~~~~~~~~~~
/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:17:46: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   17 |                         ans += (n / b) * (max(0, (b - k)));
      |                                           ~~~^~~~~~~~~~~~
a.cc:18:35: error: no matching function for call to 'max(int, long long int)'
   18 |                         ans += max(0, ((n % b) - 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:18:35: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long long int')
   18 |                         ans += max(0, ((n % b) - 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:18:35: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   18 |                         ans += max(0, ((n % b) - k + 1));
      |                                ~~~^~~~~~~~~~~~~~~~~~~~~~