Language: C++

#include <iostream>
#include <vector>
#include <utility>
#include <map>
#include <algorithm>
#include <queue>
#include <cmath>

using namespace std;


int main() {
  int n,k;
  cin >> n >> k;
  vector<long long> a(n);
  vector<long long> 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.rbegin(),f.rend());

  long long l = -1;
  long long r = 1e12;
  while(l+1 < r) {
    long long g = (l+r)/2;
    bool flag = true;

    long long count = 0;
    for (long long i=0; i<n; i++) {
      count += max(0L,(a[i] - g/f[i]));
      if (count > k) {
        flag=false;
        break;
      }
    }
    (flag? r : l) = g;
  }

  cout << r << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:32:19: error: no matching function for call to 'max(long int, __gnu_cxx::__alloc_traits<std::allocator<long long int>, long long int>::value_type)'
   32 |       count += max(0L,(a[i] - g/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:32:19: note:   deduced conflicting types for parameter 'const _Tp' ('long int' and '__gnu_cxx::__alloc_traits<std::allocator<long long int>, long long int>::value_type' {aka 'long long int'})
   32 |       count += max(0L,(a[i] - g/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:5:
/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:32:19: note:   mismatched types 'std::initializer_list<_Tp>' and 'long int'
   32 |       count += max(0L,(a[i] - g/f[i]));
      |                ~~~^~~~~~~~~~~~~~~~~~~~