Code giving wrong answer. Pls help

help
,
1

i am trying to solve 01 knapsack problem using memorisation but my code is giving wrong answer. can somebody pls tell why?

 
#include<bits/stdc++.h>
using namespace std;


 // } Driver Code Ends
class Solution
{
    public:
    //Function to return max value that can be put in knapsack of capacity W.

int solve(int w,int wt[],int val[],int n,int i,vector<vector<int>> &dp){
       cout<<i<<endl;
        if(i=n-1)
        {
            if(w>=wt[i])
              return val[i];
            else
              return 0;
        }
        if(dp[i][w]!=-1)
             return dp[i][w];
             
       
        int include=-2,exclude;                                       
        if(wt[i]<= w)
            include=solve(w-wt[i],wt,val,n,i+1,dp)+val[i];
    
        exclude= solve(w,wt,val,n,i+1,dp);
        return dp[i][w]=max(include,exclude);
        
        
    }
    int knapSack(int W, int wt[], int val[], int n) 
    { 
       // Your code here
        vector<vector<int>> dp(n,vector<int>(W+1,-1));
        solve(W,wt,val,n,0,dp);
        return dp[n-1][W];
   
    }};

Problem Link: 0 - 1 Knapsack Problem | Practice | GeeksforGeeks