Language: C++

#include<bits/stdc++.h>
using namespace std;
std::vector<int> wt;
std::vector<int> value;
std::vector<std::vector<int>> dp;
int w,n;


int helper(int currWt, int index){
	int res =0;

	if(currWt+wt[index] <= w){
		result = max(helper(currWt+wt[index], index+1)+val[index], helper(currWt, index+1));
	}else
	    result = max(helper(currWt, index+1));

	 res = dp[currWt,index];
	 
	 return res;
}

int main()
{
	cin>>n>>w;
	val.clear();
	val.resize(n);
	wt.clear();
	wt.resize(n);
	dp.clear();
	dp.resize(w+1,std::vector<int>(n+1,-1));
	for(int i =0; i<n; i++){
		cin>>wt[i]>>val[i];
	}
	cout<<helper(0,0);
	/* code */
	return 0;
}

Compiler output:
a.cc: In function 'int helper(int, int)':
a.cc:13:17: error: 'result' was not declared in this scope
   13 |                 result = max(helper(currWt+wt[index], index+1)+val[index], helper(currWt, index+1));
      |                 ^~~~~~
a.cc:13:64: error: 'val' was not declared in this scope
   13 |                 result = max(helper(currWt+wt[index], index+1)+val[index], helper(currWt, index+1));
      |                                                                ^~~
a.cc:15:13: error: 'result' was not declared in this scope
   15 |             result = max(helper(currWt, index+1));
      |             ^~~~~~
a.cc:15:25: error: no matching function for call to 'max(int)'
   15 |             result = max(helper(currWt, index+1));
      |                      ~~~^~~~~~~~~~~~~~~~~~~~~~~~~
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:   candidate expects 2 arguments, 1 provided
/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, 1 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:   template argument deduction/substitution failed:
a.cc:15:25: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   15 |             result = max(helper(currWt, index+1));
      |                      ~~~^~~~~~~~~~~~~~~~~~~~~~~~~
/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:   candidate expects 2 arguments, 1 provided
a.cc:17:31: error: cannot convert '__gnu_cxx::__alloc_traits<std::allocator<std::vector<int> >, std::vector<int> >::value_type' {aka 'std::vector<int>'} to 'int' in assignment
   17 |          res = dp[currWt,index];
      |                               ^
a.cc: In function 'int main()':
a.cc:25:9: error: 'val' was not declared in this scope
   25 |         val.clear();
      |         ^~~