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
Which values occur exactly three times?
Implement a ROT13 cipher
Back to basics 8 - Matrix Diagonals
05 - Vector Equations 3
Create co-occurrence matrix
Simple return on investment
Number of Even Elements in Fibonacci Sequence
Cryptography with A Square Matrix : Encoding
Find a real root of a quintic function
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