Language: C++

#include <iostream>
#include <cstdio>
#include <cmath>
#include <cstdio>
#include <cstring>
#include <string>
#include <vector>
#include <set>
#include <map>
#include <stack>
#include <queue>
#include <algorithm>

#define CK(N,A,B) (A<=N&&N<B)
#define REP(i,a,b) for(int i=a;i<b;i++)
#define RREP(i,a,b) for(int i=(b-1);a<=i;i--)
#define F first
#define S second
#define ll long long;

const int INF = 1e9;
const long long  LLINF = 1e15;

using namespace std;

long long N, A, B, H[100010];

bool check(long long k){
     long long sum = 0;
     REP(i,0,N) sum += max(0, (H[i]-k*B+(A-B-1))/(A-B));
     return (sum <= k);
}

int main() {
  cin>>N>>A>>B;
  REP(i,0,N) cin>>H[i];
  long long l = 0, r = 1e9;
  while(r-l > 1){
    long long mid = (l+r)/2;
    if(check(mid)) r = mid;
    else l = mid;
  }
  cout<<r<<endl;
  return 0;
}

Compiler output:
a.cc: In function 'bool check(long long int)':
a.cc:30:27: error: no matching function for call to 'max(int, long long int)'
   30 |      REP(i,0,N) sum += max(0, (H[i]-k*B+(A-B-1))/(A-B));
      |                        ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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:30:27: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long long int')
   30 |      REP(i,0,N) sum += max(0, (H[i]-k*B+(A-B-1))/(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,
                 from a.cc:12:
/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:30:27: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   30 |      REP(i,0,N) sum += max(0, (H[i]-k*B+(A-B-1))/(A-B));
      |                        ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~