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a) the cost varies at each position
b) you should ask for a source, the fact that they post an image hints that they could be cheating on something
Okay, i got it both cost and source thanks.
So yeah, can you provide a link to this problem (not just an image) so we know you aren’t cheating?
Guess that solves the problem then (replacing
yeah, I don’t think this problem should be considered for any contest.