can anyone tell logic finding third element from the end in a linked list

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suppose
12 34 56 87 99 34
i am going to print 87
can you provide any efficient logic in linked list

Posted 1-Oct-14 19:10pm

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Sergey Alexandrovich Kryukov 2-Oct-14 1:33am

puts("87");
—SA

2 solutions

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bling · Answer 1 · 2014-10-01T20:40:00

Solution 1

As your code walks down the list, save the three most recent values. When your code reaches the end of the list, print the oldest of the three saved values.

Posted 1-Oct-14 20:40pm

bling

Comments

CPallini 2-Oct-14 3:55am

5

nv3 · Answer 2 · 2014-10-01T21:18:00

Solution 2

If it's a singly linked list, the method mentioned in solution 1 is appropriate.

If it's a doubly linked list, you have in addition to that the option to go to the end of the list and then go two elements backwards. For long lists this will be much faster than to traverse the whole list.

Posted 1-Oct-14 21:18pm

nv3

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CPallini 2-Oct-14 3:55am

5

nv3 2-Oct-14 4:39am

Thanks.