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
Swap the first and last columns
Back to basics 23 - Triangular matrix
Remove the two elements next to NaN value
Return area of square
Fill the matrix - 1
String permutations on phone keyboard
Repeat string n times
Make visible max values
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