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
Replace NaNs with the number that appears to its left in the row.
Find the biggest empty box
Generate a NaN...on purpose
String permutations on phone keyboard
Recaman Sequence - II
Find a real root of a quintic function without using roots function
Hexagonal numbers on a spiral matrix
Check if the input is an interprime
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