Language: C++

#include <bits/stdc++.h>
using namespace std;
long long int knapsack(vector<long long int> val,vector<long long int> wt,long long int n,long long int w){
    int k=0;
    for(int i=0;i<n;i++)
    k+=val[i];
    int dp[n+1][k+1];
    for(int i=0;i<n+1;i++){
        for(int j=0;j<k+1;j++){
            if(i==0){
            dp[i][j]=0;continue;}
            if(j==0){
            dp[i][j]=1;continue;}
            if(wt[i-1]<=j)
            dp[i][j]=max(wt[i-1]+dp[i-1][j-val[i-1]],dp[i-1][j]);
            else dp[i][j]=dp[i-1][j];
        }
    }
    int m=INT_MIN;
    for(int i=0;i<k+1;i++){
        if(dp[n][i]=w)
        m=max(m,dp[n][i]);
    }
    return m;
}
int main() {
   long long int n,w;
   cin>>n>>w;
   vector<long long int> wt(n),val(n);
   int i=0;
   while(i<n){
       cin>>wt[i]>>val[i];
       i++;
   }
   cout<<knapsack(val,wt,n,w)<<endl;
   return 0;
}

Compiler output:
a.cc: In function 'long long int knapsack(std::vector<long long int>, std::vector<long long int>, long long int, long long int)':
a.cc:15:25: error: no matching function for call to 'max(__gnu_cxx::__alloc_traits<std::allocator<long long int>, long long int>::value_type, int&)'
   15 |             dp[i][j]=max(wt[i-1]+dp[i-1][j-val[i-1]],dp[i-1][j]);
      |                      ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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:15:25: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   15 |             dp[i][j]=max(wt[i-1]+dp[i-1][j-val[i-1]],dp[i-1][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:
/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:15:25: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   15 |             dp[i][j]=max(wt[i-1]+dp[i-1][j-val[i-1]],dp[i-1][j]);
      |                      ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~