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
Test if a Number is a Palindrome without using any String Operations
Find the largest value in the 3D matrix
Make a random, non-repeating vector.
05 - Vector Equations 3
longest sequence of nans
String permutations on phone keyboard
Happy Free Wednesday!
Simple return on investment
Digit concentration in Champernowne's constant
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