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Yahoo Interview Question for Software Engineer / Developers


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run three iterators with different speeds : 1x, 2x, 3x
(1+2)meeting means - we have a loop, and they have to stop on first element (so you could calculate a lopop size and move to mid point).

- Anonymous June 23, 2011 | Flag Reply
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1x and 2x will meet if there is a loop. When they meet again, 1x runs the loop length L from the first meet point. now run 1x,2x and 2x-L from the start. when 2x and 2x-L meet, 1x is at the mid point.

- Anonymous August 05, 2011 | Flag Reply
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Can n e 1 plz explain how to get the midpoint....??

- techdebugger.zg September 18, 2011 | Flag Reply
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0
of 0 votes

Have two pointers as slow and fast.
slow -> next
fast -> next.next

when fast reaches the end of the node, then slow will be in the middle.
Please refer to Floyd cyclic detection algorithm, the same algorithm is used for cycle detection as well.

- Hari July 31, 2012 | Flag


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