Why wrong ans for 3 test cases?

#1
#2 
	int e=0, s= 0 ;
		for(int i=0;i<n;i++){
			arr[i]=s.nextInt();
			e+=arr[i];
            s  = Math.max(s, a[i]);
		}

do not start s = 0
u cannot sort the array since continous segments of board need to be painted
s needs to be the max element of the array