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
Get the area codes from a list of phone numbers
Return elements unique to either input
02 - Vector Variables 3
2倍してみよう - ここからスタート！
Help the Patriots get to the Super Bowl
Check if the input is a balanced prime
Mean = Standard Deviation
Check if the input is an interprime
Recaman Sequence - I
Find a real root of a quintic function without using roots function
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