Language: C++

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

int main(void){
    long long int N, K;
    cin >> N >> K;
    
    vector<int> A(N), F(N);
    for (int i = 0; i < N; i++) cin >> A[i];
    for (int i = 0; i < N; i++) cin >> F[i];
    sort(A.begin(), A.end());
    sort(F.begin(), F.end(), greater<int>());
    
    long long int m = 0;
    for (int i = 0; i < N; i++)
        if (A[i]*F[i] > m)
            m = A[i] * F[i];
    
    long long int siki = m / 2;
    long long int mitasu = m;
    long long int mitasanai = -1;
    while (m != 0) {
        long long int K_c = K;
        //cout << siki << endl;
        for (int i = 0; i < N; i++) {
            K_c -= max(0, A[i]-siki/F[i]);
            //cout << siki << " " << max(0, A[i]-siki/F[i]) << " "<< A[i] - siki/F[i] << endl;
            if(K_c < 0) {
                mitasanai = siki;
                if (mitasanai+1 == mitasu)
                    break;
                siki = (mitasu + siki) / 2;
                break;
            }
        }
        if (K_c >= 0) {
            mitasu = siki;
            siki = (mitasanai+mitasu) / 2;
        }
        
        if (mitasanai+1 == mitasu)
            break;
    }
    cout << mitasu << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:28:23: error: no matching function for call to 'max(int, long long int)'
   28 |             K_c -= max(0, A[i]-siki/F[i]);
      |                    ~~~^~~~~~~~~~~~~~~~~~~
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:28:23: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long long int')
   28 |             K_c -= max(0, A[i]-siki/F[i]);
      |                    ~~~^~~~~~~~~~~~~~~~~~~
/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:28:23: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   28 |             K_c -= max(0, A[i]-siki/F[i]);
      |                    ~~~^~~~~~~~~~~~~~~~~~~