The divide and conquer strategy for closest point problem sorts the points according to x coordinates so that the median could be found. But what does sorting the strip (strip array contains all the points which are at most d perpendicular distance apart from the median line where d is the minimum distance till now) according to the y coordinates serve any purpose? Is there something that cannot be done by the already x coordinate sorted array?

Link for reference

  • Look at 3.2: Thankfully, we can make another life saving observation at this point...
    – Kain0_0
    Mar 21, 2021 at 23:54
  • The link works in my device. Mar 22, 2021 at 3:33
  • @user12208242 you did nothing wrong with your URL. I'm seeing that Safari on Mac is Ok with the tilde "~" character as is, but somehow fails when it is properly re-encoded as "%7E". I tested this separately on a page on my Mac. But the current edit and your original seemed to work fine on Chrome from Windows. Also on Safari, a forward slash oddly shows up after ".html" before the anchor ".html/#anal" and that fails. So there are two things here that Safari on my Mac dislikes. I put in an edit that Safari seemed OK with but there's another edit instead that still fails for me. Mar 22, 2021 at 20:23

1 Answer 1


I think the answer is in the previous section 3.2 I've quoted below. I think this answers your immediate question.

However, since we sorted the points in the strip by their y-coordinates the process of merging our two subsets is not linear, but in fact takes O(nlogn) time.

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