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 to see if a Sudoku Puzzle is Solved
Reverse the Words (not letters) of a String
Replicate elements in vectors
Try 1.5.4: Celsius to Fahrenheit
find the maximum element of the matrix
Bridge and Torch Problem - Minimum time
Pi Digit Probability
Area under standard normal curve
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