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Can you please explain problem D, and if any prerequisites are required that I must go through before solving D

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Are there any prerequisite topics we need to learn before attempting Problem D?

Are there any prerequisite topics we need to learn before attempting Problem D?

lol!

can somebody pls explain me why are we checking the parity of k and parity of the distances?....

can somebody pls explain me problem D, I am having problems understanding the given solution.