Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef unsigned long long ll;

int main()
{
    ll n,a,i,j,k;
    cin>>n>>a;
    ll x[n+1];
    for(i=1;i<=n;i++)
    {
        cin>>x[i];
    }
    ll dp[51][51][2501];
    for(i=0;i<=2500;i++)
    {
        dp[0][0][i] = 0;
    }
    for(i=1;i<=n;i++)
    {
        for(k=0;k<=2500;k++)
        {
            ll count = 0;
            for(j=1;j<=i;j++)
            {
                if(x[j]==k)
                    count++;
            }
            dp[i][1][k] = count;
        }
    }
    for(i=2;i<=n;i++)
    {
        for(j=2;j<=i;j++)
        {
            for(k=0;k<=2500;k++)
            {
                dp[i][j][k] = max(dp[i][j][k],dp[i-1][j][k]+dp[i-1][j-1][max(0LL,k-x[i])]);
                /*if(dp[i][j][k]>0 && j==2 && k==8)
                {
                    cout<<i<<" "<<j<<" "<<k<<" "<<dp[i][j][k]<<endl;
                }*/
            }
        }
    }
    ll ans = 0;
    for(i=1;i<=n;i++)
    {
        ans += dp[n][i][a*i];
        // cout<<dp[n][i][a*i]<<" ";
    }
    cout<<ans<<endl;
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:38:77: error: no matching function for call to 'max(long long int, ll)'
   38 |                 dp[i][j][k] = max(dp[i][j][k],dp[i-1][j][k]+dp[i-1][j-1][max(0LL,k-x[i])]);
      |                                                                          ~~~^~~~~~~~~~~~
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:38:77: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'll' {aka 'long long unsigned int'})
   38 |                 dp[i][j][k] = max(dp[i][j][k],dp[i-1][j][k]+dp[i-1][j-1][max(0LL,k-x[i])]);
      |                                                                          ~~~^~~~~~~~~~~~
/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:38:77: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   38 |                 dp[i][j][k] = max(dp[i][j][k],dp[i-1][j][k]+dp[i-1][j-1][max(0LL,k-x[i])]);
      |                                                                          ~~~^~~~~~~~~~~~