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
Check if sorted
Test if a Number is a Palindrome without using any String Operations
Remove the two elements next to NaN value
Make visible max values
Van Eck's Sequence's nth member
Fill the matrix - 1
replace nan values iteratively.
Number of Even Elements in Fibonacci Sequence
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