Language: C++

#include <iostream>
#include <algorithm>
#include <cmath>
#include <string>
#include <array>
#include <vector>
#include <functional>
using namespace std;

int main(void) {
	double N, Ma, Mb, i, j, count = 0;
	vector<double> a(N);
	vector<double> b(N);
	vector<int> c(N);
	cin >> N >> Ma >> Mb;
	for (i = 0; i < N; i++) {
		cin >> a[i] >> b[i] >> c[i];
	}

	for (i = 0; i < N; i++) {
		for (j = 0; j < N; j++) {
			if ((a[i] + a[j]) / (b[i] + a[j]) == Ma / Mb) {
				count = max(count, c[i] + c[j]);
			}
		}
	}
	if (count > 0) {
		cout << count << endl;
	}
	else {
		cout << -1 << endl;
	}
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:23:44: error: no matching function for call to 'max(double&, __gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type)'
   23 |                                 count = max(count, c[i] + c[j]);
      |                                         ~~~^~~~~~~~~~~~~~~~~~~~
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:23:44: note:   deduced conflicting types for parameter 'const _Tp' ('double' and '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type' {aka 'int'})
   23 |                                 count = max(count, c[i] + c[j]);
      |                                         ~~~^~~~~~~~~~~~~~~~~~~~
/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:2:
/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:23:44: note:   mismatched types 'std::initializer_list<_Tp>' and 'double'
   23 |                                 count = max(count, c[i] + c[j]);
      |                                         ~~~^~~~~~~~~~~~~~~~~~~~