Language: C++

#include <bits/stdc++.h>
using namespace std;

long long int trade(int n, long long int *a, long long int *b) {
    long long int ans = n;
    for (int i = 0; i * a[0] <= n; i++)
        for (int j = 0; i * a[0] + j * a[1] <= n; j++) {
            int k = (n - i * a[0] - j * a[1]) / a[2];
            ans = max(ans, n + i * (b[0] - a[0]) + j * (b[1] - a[1]) + k * (b[2] - a[2]));
        }
    return ans;
}

int main() {
    int n;
    long long a[3], b[3];
    cin >> n >> a[0] >> a[1] >> a[2] >> b[0] >> b[1] >> b[2];
    n = max(n, trade(n, a, b));
    n = max(n, trade(n, b, a));
    cout << n << "\n";
}


Compiler output:
a.cc: In function 'int main()':
a.cc:18:12: error: no matching function for call to 'max(int&, long long int)'
   18 |     n = max(n, trade(n, a, b));
      |         ~~~^~~~~~~~~~~~~~~~~~~
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:18:12: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long long int')
   18 |     n = max(n, trade(n, a, b));
      |         ~~~^~~~~~~~~~~~~~~~~~~
/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:18:12: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   18 |     n = max(n, trade(n, a, b));
      |         ~~~^~~~~~~~~~~~~~~~~~~
a.cc:19:12: error: no matching function for call to 'max(int&, long long int)'
   19 |     n = max(n, trade(n, b, a));
      |         ~~~^~~~~~~~~~~~~~~~~~~
/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:19:12: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long long int')
   19 |     n = max(n, trade(n, b, a));
      |         ~~~^~~~~~~~~~~~~~~~~~~
/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:19:12: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   19 |     n = max(n, trade(n, b, a));
      |         ~~~^~~~~~~~~~~~~~~~~~~