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
Project Euler: Problem 8, Find largest product in a large string of numbers
Rotate a Matrix
CONVERT TAN TO SIN
subtract central cross
06 - Matrix Equations 2
Mean = Standard Deviation
Cryptography with A Square Matrix : Encoding
unique with nan
Bridge and Torch Problem - Minimum time
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