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
Summing Digits within Text
Count from 0 to N^M in base N.
Back to basics 10 - Max Float
Fill a zeros matrix
Determine if input is a valid AHP evaluation matrix
Cryptography with A Square Matrix : Decoding
Make visible max values
Write c^3 as sum of two squares a^2+b^2
Good Morning :)
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