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
Matrix with different incremental runs
Sum the elements in either diagonal of a square matrix
Number of digits in an integer
Find the hypotenuse
Is there a GPU Device?
Bridge and Torch Problem - Length of Unique Time List
Find two triangular numbers whose sum is input.
Duration of a trip in minutes
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