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
All your base are belong to us
Volume difference between Ellipsoid and Sphere
Who invented zero?
07 - Common functions and indexing 6
Check if the input is a balanced prime
Peg Solitaire - Apply Move
Write out numbers in words
Make visible max values
Modular multiplicative inverse
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