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
Check if sorted
Back to basics 21 - Matrix replicating
kmph to mps
Length of a short side
Bridge and Torch Problem - Minimum time
Longest Sequence of NaNs
Repeat string n times
Duration of a trip in minutes
Modular multiplicative inverse
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