Language: C++

#include<iostream>
#include<algorithm>
#include<vector>
#include<string>
#include<cmath>
#include<cstdio>
#include<queue>
#include<deque>
#include<map>
#include<stack>
#include<set>
#include<utility>
using namespace std;
typedef pair<int,int> ii;
typedef long long ll;
typedef pair<ll,ll> P;
typedef unsigned long long int ull;
int dy[]={1,0,-1,0};
int dx[]={0,1,0,-1};
const int MAXN=100000;
const int MAXE=100000;
const int MAXV=10000;
const ll INF=2e18;
const ll MOD=1e9+7;

int main(){
    ll N,K;cin>>N>>K;K++;
    vector<ll> A(N);
    for(int i=0;i<N;++i) cin>>A[i];
    ll ans=0;
    for(int d=50;d>=0;--d){
        if(!(K&(1LL<<d))) continue;
        ll tmp=0;
        for(int e=50;e>=0;--e){
            ll mask=1LL<<e;
            int num=0;
            for(int i=0;i<N;++i){
                if(A[i]&mask) ++num;
            }
            if(e>d){
                if(K&mask) tmp+=mask*(N-num);
                else tmp+=mask*num;
            }else if(e==d){
                tmp+=mask*num;
            }else{
                tmp+=mask*max(num,N-num);
            }
        }
        ans=max(ans,tmp);
    }
    cout<<ans<<endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:46:30: error: no matching function for call to 'max(int&, ll)'
   46 |                 tmp+=mask*max(num,N-num);
      |                           ~~~^~~~~~~~~~~
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:46:30: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'll' {aka 'long long int'})
   46 |                 tmp+=mask*max(num,N-num);
      |                           ~~~^~~~~~~~~~~
/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:46:30: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   46 |                 tmp+=mask*max(num,N-num);
      |                           ~~~^~~~~~~~~~~