unknown Interview Question for Software Engineer / Developers






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3d plane = 3d space... but this is not important... :)
is there a metric/distance like Euclidean metric?

It is not possible because you can't say when to finish - you have an infinite number of points. :)
A very simple alg: If infinite = a very large number, N, I'd use a max-heap of size k.
TC: O(N log k).

If you are looking for something more sophisticated, en.wikipedia.org/wiki/Nearest_neighbor_search

- S August 21, 2010 | Flag Reply
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we will use max-heap or min heap..I am confused bcuz as a new data come and we take minimum of that(heap) and next is larger then we can remove lowest in heap. and insert it in heap of k.And again find minium and so on

- ashish.cooldude007 August 21, 2010 | Flag
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We can sort all points(N) using Quicksort where pivot is found randomly. When the random pivot is bigger than the K, then finds a new pivot on the left; or on the right. The time coplexity is nlg(k).

- zzg August 22, 2010 | Flag
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"infinite points"? If that means very large n, you can do O(n) by partitioning.

- DRY August 21, 2010 | Flag Reply
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en.wikipedia.org/wiki/K-nearest_neighbor_algorithm

- sk August 26, 2010 | Flag Reply


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