We will delete the rows in the middle and keep the first and the last rows.
For example if input is
[1 2 1 7 1 8 1 6 1 5]
then output will be
[1 2 1 5]
keeping the first and the last rows. However there will be more than one row index and that makes this question challenging.
Note: Elements of input row index is always greater than or equal to 2.
Related Challenge - Problem 2084. Sum Rows
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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