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
Prime factor digits
Test if a Number is a Palindrome without using any String Operations
Scoring for oriented dominoes
Celsius to Fahrenheit converter
Repeat string n times - 2
Determine if input is a valid AHP evaluation matrix
Duration of a trip in minutes
unique with nan
Low level NaN
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