I don't know what you mean by false positives? The test is how many numbers in the range are part of at least count pairs. Having both ends of a pair in the range just means both numbers count. And each number only counts once. Can you explain what you think is ambiguous? (Agreed that PWC often is; usually the examples clarify, but not always.)

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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