The description of this problem is not very clear. It's really asking for the first and last row for each unique value in the first column.
"However there will be more than one row index and that makes this question challenging." - that really explains nothing to me
Is my wife right?
Project Euler: Problem 1, Multiples of 3 and 5
Is this triangle right-angled?
Digit concentration in Champernowne's constant
Recaman Sequence - I
Mean = Standard Deviation
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