Language: C++

#include <iostream>
#include <algorithm>
using namespace std;

typedef long long ll;

int n, k;

bool need(int*, int);
int main(){
  cin >> n >> k;
  int a[n+1];
  for(int i=1; i<=n; i++) cin >> a[i];
  sort(a+1, a+n+1);

  int l=1, r=n, m;
  if(need(a, 1)){
    cout << 0 << endl;
    return 0;
  }
  if(!need(a, n)){
    cout << n << endl;
    return 0;
  }

  while(l+1<r){
    m = (l+r)/2;
    if(need(a, m)){
      r = m;
    }
    else{
      l = m;
    }
  }

  cout << r-1 << endl;

  return 0;
}

//カードindexが要るならtrue, いらないのならfalse
bool need(int* a, int index){
  int tmp[n];
  for(int i=1, j=1; i<=n; i++){
    tmp[j] = a[i];
    if(i!=index) j++;
  }

  bool dp[n][k];
  for(int i=0; i<n; i++){
    for(int j=0; j<k; j++) dp[i][j] = false;
  }
  dp[0][0] = true;

  for(int i=1; i<n; i++){
    for(int j=0; j<k; j++){
      if(j<tmp[i]) dp[i][j] = dp[i-1][j];
      else dp[i][j] = dp[i-1][j] || dp[i-1][j-tmp[i]];
    }
  }

  for(int j=max(1LL*0, k-a[index]); j<k; j++){
    if(dp[n-1][j]) return true;
  }

  return false;
}


Compiler output:
a.cc: In function 'bool need(int*, int)':
a.cc:62:16: error: no matching function for call to 'max(long long int, int)'
   62 |   for(int j=max(1LL*0, k-a[index]); j<k; j++){
      |             ~~~^~~~~~~~~~~~~~~~~~~
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:62:16: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   62 |   for(int j=max(1LL*0, k-a[index]); j<k; j++){
      |             ~~~^~~~~~~~~~~~~~~~~~~
/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:62:16: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   62 |   for(int j=max(1LL*0, k-a[index]); j<k; j++){
      |             ~~~^~~~~~~~~~~~~~~~~~~