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
Back to basics 4 - Search Path
Multiply 2 numbers
Area of an equilateral triangle
Divide by 4
Produce the following matrix
Hexagonal numbers on a spiral matrix
Net Present Value of a Stream of Cash Flows
Longest Sequence of NaNs
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