Language: C++

#include<bits/stdc++.h>
#define fastIO ios::sync_with_stdio(false);cin.tie(0);
#define ll long long
#define f(i, l, r) for(i = l; i < r; i++)
#define fd(i, l, r) for(i = l; i > r; i--)
#define mod 1000000007
#define pb push_back
using namespace std;
typedef pair <int, int> pi;

int main(){
	fastIO
    int test = 1;
    // cin >> test;
    while(test--){
        int n, w; cin >> n >> w;
        ll weight[n], i, j;
        long int value[n];
        f(i,0,n) cin >> weight[i] >> value[i];
        int knapsack[n+1][w+1];
        f(i,0,n){
            f(j,0,w){
                if(i==0 || j==0)
                    knapsack[i][j] = 0;
                else if(weight[i] <= j)
                    knapsack[i][j] = max(value[i-1] + knapsack[i-1][j-weight[i-1]], knapsack[i-1][j]);
                else knapsack[i][j] = knapsack[i-1][j];
            }
        }
        cout << knapsack[n][w];
        
    }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:26:41: error: no matching function for call to 'max(long int, int&)'
   26 |                     knapsack[i][j] = max(value[i-1] + knapsack[i-1][j-weight[i-1]], knapsack[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:26:41: note:   deduced conflicting types for parameter 'const _Tp' ('long int' and 'int')
   26 |                     knapsack[i][j] = max(value[i-1] + knapsack[i-1][j-weight[i-1]], knapsack[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:26:41: note:   mismatched types 'std::initializer_list<_Tp>' and 'long int'
   26 |                     knapsack[i][j] = max(value[i-1] + knapsack[i-1][j-weight[i-1]], knapsack[i-1][j]);
      |                                      ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~