Memory is not a constraint. In a single iteration(NOTE: you
can't go back), how will you find out the 10th last
node/item in a linked list.
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Answer Posted / ashutosh
Assume the list is a circular one (implemented by pos%10).
So, when you are iterating, you are going round and round in
a circle. When you reach the end, you just have to go back
exactly 10 items. By going back here means accessing the
element 10 position prior to the current one, which is
implemented by (pos-10)%10
Since, it's a circular array as assumed, you have always
access it by doing pos%10 or (pos-10)%10.
NOTE: The value of pos has always been incremented and never
decremented or set to zero.
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