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
give nth decimal place of pi
Getting the indices from a matrix
Challenging perms function!
Pi Digit Probability
Cryptography with A Square Matrix : Decoding
Number of Even Elements in Fibonacci Sequence
Recaman Sequence - I
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