Two test cases are giving wrong result

#1

Hi, I am unable to rectify the mistake i have done in my code , two test cases are giving the wrong answer and rest are giving correct ans .

#2

s = arr[n-1];
is wrong
the aray need not be sorted always

take s as
for(int i = 0 ; i < n ; i++)
s = max( s ,a[i]) ;

#3

still test case 2 is failing

#4 
	ll s = *max_element(arr,arr+n);
	ll e = 0;
	for(ll i=0;i<n;i++)
	{
		e=e+arr[i];
	}
	ll ans = 0 ;
	while(s<=e)
	{
		ll mid = (s+e)/2;
		{
			if(canread(arr,k,n,mid))
			{
				ans = mid;
				e=mid-1;
			}

updated code part

rest is same passing all test cases now

#5

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