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### How to implement a trail for pointer on the screen like the one in fruit ninja game (image in the question)?

So I basically want to make a trail behind a cursor - I'm fairly new to coding and am more interested in the method then some exact code which will do the thing. I've attempted to solve the problem in ...
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### How to prove that the problem $\text{"If$L$is a context-free language, then, is$\overline{L}$also context-free?"}$ is undecidable?

Lately I came across a problem: $\text{"If$L$is a context-free language, then, is$\overline{L}$also context-free?"}$ And I need to comment on its decidability. Now I know that context free ...