Give an O(n) time non-recursive procedure that reverses a singly linke

1.	Give an O(n) time non-recursive procedure that reverses a singly linked list of n nodes. The procedure should not use more than constant storage beyond that needed for the list itself.
Answer» The O (n) time non-recursive procedure that reverses a singly linked list of n nodes is as follows. reverse (struct node *st) { struct node p, q, r; p = st; q = NULL; while (p != NULL) { r =q; q = p; p = p → link; q → link = r; } st = q; }

Give an O(n) time non-recursive procedure that reverses a singly linked list of n nodes. The procedure should not use more than constant storage beyond that needed for the list itself.

Answer»

The O (n) time non-recursive procedure that reverses a singly linked list of n nodes is as follows.

reverse (struct node **st)

{

struct node

*p, *q, *r; p = *st;

q = NULL;

while (p != NULL)

{

r =q;

q = p;

p = p → link;

q → link = r;

}

*st = q;

}

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Give an O(n) time non-recursive procedure that reverses a singly linked list of n nodes. The procedure should not use more than constant storage beyond that needed for the list itself.

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