None of the examples involve finding A given B, but that just means they work either way. But to me the problem statement is clear: "the number of integers $i in the range $from <= $i <= $to that belong to at least $count different shuffle pairs".

In reply to Re^3: Faster (but uglier) PWC 350-2 solutions by ysth
in thread Faster (but uglier) PWC 350-2 solutions by Anonymous Monk

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