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 / aaptuster
Cant we simply check it using 10 dereferencing.
ptr -> ptr -> ptr -> ptr -> ->ptr and so on...
This could be generalized for n, as we could generate this
command string on the fly and execute the command ..
| Is This Answer Correct ? | 1 Yes | 0 No |
Answer / 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.
| Is This Answer Correct ? | 2 Yes | 2 No |
Answer / anon
Have two pointers p1 and p2.p1 points to the first node in the linked list.p2 to the tenth node.Now move both the pointer togther till p2->link = NULL.P1 is pointing to the 10th node from the last
| Is This Answer Correct ? | 1 Yes | 1 No |
Answer / mayank pathak
Maintain a queue with ten elements. As u encounter a new
element in the linked list dequeue one element and enqueue
this new element. When the link list is fully scanned the
first element of the queue would be the 10th last element.
| Is This Answer Correct ? | 0 Yes | 0 No |
Answer / dark knight
1-TAKE TWO POINTERS
2-ITERATE 1 POINTER IN THE LIST UP TO THE 10th POSITION FROM STARTING
3-INITIALLY----2nd POINTER IS AT THE HEAD NODE .
4-NOW INCREEMENT both POINTER TO THE NEXT POTISION SUCH THAT THE
1st pointer reaches end .
5--2ND POINTER IS THE REQUIRED NODE
| Is This Answer Correct ? | 0 Yes | 0 No |
Answer / ashutosh
List *nodes[10]; //asked 10th last, so, only 10 items
int pos = 0;
List *ptr = &FirstNode
while(ptr)
{
nodes[(pos%10)] = ptr;
pos++;
ptr = ptr->next;
}
if(pos>=10)
{
printf("Tenth last element is %d",nodes[(pos-10)%10]->data);
}
else
{
printf("There doesn't exist any 1oth last element");
}
| Is This Answer Correct ? | 13 Yes | 17 No |
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