zzzzsust19's blog

By zzzzsust19, history, 13 months ago, In English

This is a convex hull trick problem. I am building my convex hull from leaf to higher nodes. Every time I am going through all my child nodes, I am merging them together. In this solution, I am not applying light to heavy technique. Because of the increasing CHT size, I would expect my solution to get TLE on the given constraints. But for some reason, it's not getting TLE. Anyone got any proper explanation?

Problem: 932F - Escape Through Leaf

My submission: 227235272

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13 months ago, # |
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Auto comment: topic has been updated by zzzzsust19 (previous revision, new revision, compare).

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13 months ago, # |
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It might be that on random tests the average size of the CHT is O(log N) where N is the number of elements added at some point in time. Also you might get lucky and have the heavy nodes coveniently placed.

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    13 months ago, # ^ |
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    Yeah, but if the tree is carefully created it's possible that no line in the convex hull get's deleted. There should be test cases like that