Painter Problem

#1

Can somebody point out the problem in this code

#include<iostream>
#include<cstring>
#include<algorithm>
#include<cmath>
using namespace std;
typedef long long ll;
bool ispossible(ll arr[],ll n,ll k,ll t,ll mid)
{
ll i=0,painter=0,curr=0;
for(i=0;i<n;i++)
{
    if(curr+arr[i]<mid)
    {
        curr+=arr[i];
    }
    else
    {
        painter++;
        curr=arr[i];
    }
    if(painter>k)
    {
        return false;
    }
    //i++;
}
return true;
}

int main()
{
    ll n,k,t,sum=0,maxs=0;
    ll arr[n];int num;
    cin>>n>>k>>t;
    for(int i=0;i<n;i++)
    {
        cin>>arr[i];
        sum+=arr[i];
    }
     for(ll i=0;i<n;i++)
    {
		if(arr[i]>maxs)
		{
			maxs=arr[i];
		}
    }
    ll start=maxs;
    ll end=sum;
    ll mid,ans=0;
    while(start<=end)
    { 
        mid=(start+end)/2;
		cout<<mid;
        if(ispossible(arr,n,k,t,mid))
        {
            ans=mid;
			end=mid-1;
            //ans=min(mid,ans);

        }
        else
        start=mid+1;
    }
num=(ans)%10000003;	
cout<<(num);//%10000003);
return 0;
}