LL-k Reverse Why runtime error?

#1

public void reverse(int k,int N)throws Exception
{
for(int i=0;i<N;i=i+k)
{
int l=i;
int h=k+i-1;
Node low=getNodeAt(i);;
Node high=getNodeAt(h);
while(l<h)
{
int temp=getAt(l);
low.data=high.data;
high.data=temp;
l++;
h–;
low=low.next;
high=getNodeAt(h-1);
}

	}
#2

Also say is it the correct approach to slve this problem?

#3

@Rahul-Kumar-2389849724440887,
https://ide.codingblocks.com/s/221925 here is the suggested approach.

  1. Reverse the first sub-list of size k.1.1 While reversing keep track of the next node and previous node.1.2 Let the pointer to the next node be next and pointer to the previous node be prev.
  2. head->next = reverse(next, k) - Recursively call for rest of the list and link the two sub-lists
  3. return prev - prev becomes the new head of the list (see the diagrams of iterative method of this post)
#4

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