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 the longest sequence of 1's in a binary sequence.
Connect Four Win Checker
Sorted highest to lowest?
Find Index of maximum Value and maximum Value of a vector
Create initial basic feasible solution for transportation problems - North-West Corner Method
Van Eck's Sequence's nth member
Challenging perms function!
Create initial basic feasible solution for transportation problems -Minimum Cost Method
Calculate trends in time series
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