Language: C++

#include <iostream>
#include <map>
#include <vector>
#include <algorithm>
#include <queue>
#include <math.h>
#include <stack>
#include <set>
#include <deque>

using namespace std;
typedef long long ll;
ll mod = 1e9+7;
#define rep(i,n) for(int i = 0; i < (n); ++i)

int main(){
    int n, k;
    cin >> n >> k;
    ll ans = 0;
    if ( k == 0 ) {
        cout << n * n << endl;
        return 0;
    }
    for ( ll i = k + 1; i <= n; ++i ) {
        int mod_group_num = n / i;
        int cntup_num = i - k;
        int rest_num = n - mod_group_num * i;
        int add_cntup_num = max(0LL, rest_num - k + 1);
        ans += cntup * mod_group_num + add_cntup_num;
    }
    cout << ans << endl;
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:28:32: error: no matching function for call to 'max(long long int, int)'
   28 |         int add_cntup_num = max(0LL, rest_num - k + 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:28:32: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   28 |         int add_cntup_num = max(0LL, rest_num - 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,
                 from a.cc:4:
/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:28:32: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   28 |         int add_cntup_num = max(0LL, rest_num - k + 1);
      |                             ~~~^~~~~~~~~~~~~~~~~~~~~~~
a.cc:29:16: error: 'cntup' was not declared in this scope
   29 |         ans += cntup * mod_group_num + add_cntup_num;
      |                ^~~~~