Language: C++

#include <iostream>
#include <algorithm>
#include <iomanip>
#include <string>
#include <vector>
#include <math.h>
#include <queue>
#include <deque>
#include <stack>
#include <map>
#define PI 3.14159265359
typedef long long ll;
const int MOD = 1e9+7;
const ll LLINF = 1e18;
using namespace std;

ll n, a, b;

bool is_ok(vector<ll> &h, ll num){
	ll coun = 0;
	for (int i = 0; i < n; i++){
		coun += max(0, (h[i] - b*num + a - 1)/a);
	}
	if (coun <= num) return true;
	return false;
}

int nibutan(vector<ll> &h, ll ok, ll ng){
	if (ok - ng == 1) return ok;
	ll mid = (ok+ng)/2;
	if (is_ok(h, mid)) return nibutan(h, mid, ng);
	return nibutan(h, ok, mid);
}


int main(){
	cin >> n >> a >> b;
	vector<ll> h(n);
	ll hmax = 0;
	for (int i = 0; i < n; i++){
		cin >> h[i];
		hmax = max(hmax, h[i]);
	}

	a -= b;

	cout << nibutan(h, hmax/b+1, 0) << endl;

	return 0;
}


Compiler output:
a.cc: In function 'bool is_ok(std::vector<long long int>&, ll)':
a.cc:22:28: error: no matching function for call to 'max(int, __gnu_cxx::__alloc_traits<std::allocator<long long int>, long long int>::value_type)'
   22 |                 coun += max(0, (h[i] - b*num + a - 1)/a);
      |                         ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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:22:28: note:   deduced conflicting types for parameter 'const _Tp' ('int' and '__gnu_cxx::__alloc_traits<std::allocator<long long int>, long long int>::value_type' {aka 'long long int'})
   22 |                 coun += max(0, (h[i] - b*num + a - 1)/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
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:22:28: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   22 |                 coun += max(0, (h[i] - b*num + a - 1)/a);
      |                         ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~