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Open thread, August 14 - August 20, 2017 — LessWrong

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Open thread, August 14 - August 20, 2017

14th Aug 2017

1 min read

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Another week, another open thread, another problem, too!

It's an old problem, cousin_it has posted:

Here's another problem that might be easier. Make an O(n log n) sorting algorithm that's simple, stable, and in place.

Radix. Except that it's not in place.

3Oscar_Cunningham9y

EDIT: Clarified some things. Suppose we have a bunch of spherical billiard balls rolling around on an infinite plane. Suppose there is no friction and the collisions are elastic. They don't feel the influence of gravity or any other force except the collisions. At least one ball is moving. Can they ever return to their original positions and velocities?