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
Find common elements in matrix rows
Permute diagonal and antidiagonal
Duplicate a character
Area of an equilateral triangle
Find a real root of a quintic function
Recaman Sequence - II
Net Present Value of a Stream of Cash Flows
Simple return on investment
Bridge and Torch Problem - Length of Unique Time List
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