Language: C++

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

constexpr int lim = 2000;
ll n, a[lim+1], memo[2][lim+1];

/*
  turn := 手番(X->0, Y->1)
  i := 相手が何番目のカードを持っているか
*/
int dfs(int id, int turn, int x, int y){
  if(memo[turn][id]) return memo[turn][id];

  if(n == id) return memo[turn][id] = abs(x-y);

  if(turn == 0){
    ll ret = 0;
    for(int i=id; i<n; i++){
      ret = max(ret, dfs(i+1, 1, a[i], y));
    }

    return memo[turn][id] = ret;
  }
  else{
    ll ret = LLONG_MAX;
    for(int i=id; i<n; i++){
      ret = min(ret, dfs(i+1, 0, x, a[i]));
    }

    return memo[turn][id] = ret;
  }
}

int main(){
  ll z, w;
  cin >> n >> z >> w;
  for(int i=0; i<n; i++) cin >> a[i];

  cout << dfs(0, 0, z, w) << endl;

  return 0;
}


Compiler output:
a.cc: In function 'int dfs(int, int, int, int)':
a.cc:20:16: error: no matching function for call to 'max(ll&, int)'
   20 |       ret = max(ret, dfs(i+1, 1, a[i], y));
      |             ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
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:20:16: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   20 |       ret = max(ret, dfs(i+1, 1, a[i], y));
      |             ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
/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:20:16: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   20 |       ret = max(ret, dfs(i+1, 1, a[i], y));
      |             ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
a.cc:28:16: error: no matching function for call to 'min(ll&, int)'
   28 |       ret = min(ret, dfs(i+1, 0, x, a[i]));
      |             ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::min(const _Tp&, const _Tp&)'
  233 |     min(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note:   template argument deduction/substitution failed:
a.cc:28:16: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   28 |       ret = min(ret, dfs(i+1, 0, x, a[i]));
      |             ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::min(const _Tp&, const _Tp&, _Compare)'
  281 |     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note:   candidate expects 3 arguments, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5686:5: note: candidate: 'template<class _Tp> constexpr _Tp std::min(initializer_list<_Tp>)'
 5686 |     min(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5686:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5696:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::min(initializer_list<_Tp>, _Compare)'
 5696 |     min(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5696:5: note:   template argument deduction/substitution failed:
a.cc:28:16: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   28 |       ret = min(ret, dfs(i+1, 0, x, a[i]));
      |             ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~