What's wrong in my approach?

#1
#2 
	for(int i=0;i<n;i++){
				int p=0;
				while(p+a[j]<=mid&&j<=n-1){
					j++;
					p=p+a[j];
					if(p+a[j]>mid){
                        p = 0 ;
					 cnt++;}
				}
			}

yeh code ka logic galat h

use this
bool isValidConfig(ll arr[], ll n, ll m, ll ans)
{
int students = 1;
ll currentpages = 0;
for (int i = 0; i < n; i++)
{
if (currentpages + arr[i] > ans)
{
currentpages = arr[i];
students++;

            if (students > m)
            {
                return false;
            }
        }
        else
        {
            currentpages += arr[i];
        }
    }
    return true;
}
#3

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#4
#5

do let me know what is wrong in my code

#6

start point is wrong


refer to this code