Language: C++

#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
#include <map>
#include <cmath>
#include <queue>
#include <numeric>
#include <climits>
#include <iterator>
#include <iomanip>
#include <stack>
#include <bitset>
#include <functional>
using namespace std;
const constexpr int INF = 1e9;
//typedef std::pair<std::string,double> P;


#define FOR(i, a, n) for (ll i = (ll)a; i<(ll)n; ++i)
#define REP(i, n) FOR(i, 0, n)

typedef long long ll;
typedef vector<int> VI;
const constexpr ll MOD = 10000000000+7;
vector<pair<int, int> > vp;
 
struct Less {
    bool operator()(const pair<int, int>& x, const pair<int, int>& y) const {
        return x.first > y.first;
    }
};

ll GCD(ll a, ll b){
    if(b==0) return a;
    return GCD(b, a%b);
}


//グラフの隣接リスト
VI g[200010];
//頂点の入次数を管理
int h[100010];
ll N, K;
string s;
ll v[51];

int main(void) {
    cin >> N >> K;
    
    ll cnt=0;
    if(K==0) cout << N*N << endl;
    else {
        for(int i=K+1; i<=N; ++i){
        cnt += N/i*max(0, i-K) + max(0, N%i-K+1);
        }
        cout << cnt << endl;
    }
    
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:55:23: error: no matching function for call to 'max(int, ll)'
   55 |         cnt += N/i*max(0, i-K) + max(0, N%i-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:55:23: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'll' {aka 'long long int'})
   55 |         cnt += N/i*max(0, 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,
                 from a.cc:3:
/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:55:23: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   55 |         cnt += N/i*max(0, i-K) + max(0, N%i-K+1);
      |                    ~~~^~~~~~~~
a.cc:55:37: error: no matching function for call to 'max(int, ll)'
   55 |         cnt += N/i*max(0, 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:55:37: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'll' {aka 'long long int'})
   55 |         cnt += N/i*max(0, 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:55:37: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   55 |         cnt += N/i*max(0, i-K) + max(0, N%i-K+1);
      |                                  ~~~^~~~~~~~~~~~