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has anyone seen a better answer for day 20 (colliding particles) rather than it's just stabilized at this number? The first part can be solved because there is a particle with a minimum acceleration, but if not for this it would be quite a bit more difficult. Similarly, the end of collisions seems to happen after a few iterations but there is no guarantee of this.


@dpsutton a friend solved it using quadratic equations to detect collisions, but in elixir: