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
radius of a spherical planet
The Hitchhiker's Guide to MATLAB
Project Euler: Problem 8, Find largest product in a large string of numbers
Cryptography with A Square Matrix : Encoding
Integer to boolean
Write out numbers in words
Hexagonal numbers on a spiral matrix
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