Language: C++

#include<iostream>
#include<string>
#include<algorithm>
#include<cmath>
#include<iomanip>
#include<cstring>
#include<map>
#include<vector>
#include<queue>
#include<climits>
#include<set>
#include<utility>
using namespace std;
typedef long long int ll;

ll dp[101][101];
ll N, W, w[101], v[101];

int rec(int i, int j){
	if(dp[i][j] >= 0){
		return dp[i][j];
	}
	int res;
	if(i == N){
		res = 0;
	} else if(j < w[i]){
		res = rec(i + 1, j);
	} else {
		res = max(rec(i + 1, j), rec(i + 1, j - w[i]) + v[i]);
	}
	return dp[i][j] = res;
}
 
int main(){

	cin >> N >> W;
	for(int i = 0; i < N; i++){
		cin >> w[i] >> v[i];
	}
	memset(dp, -1, sizeof(dp));
	cout << rec(0, W) << endl;

	return 0;
}


Compiler output:
a.cc: In function 'int rec(int, int)':
a.cc:29:26: error: no matching function for call to 'max(int, ll)'
   29 |                 res = max(rec(i + 1, j), rec(i + 1, j - w[i]) + v[i]);
      |                       ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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:29:26: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'll' {aka 'long long int'})
   29 |                 res = max(rec(i + 1, j), rec(i + 1, j - w[i]) + v[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,
                 from a.cc:3:
/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:29:26: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   29 |                 res = max(rec(i + 1, j), rec(i + 1, j - w[i]) + v[i]);
      |                       ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~