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
pressure to dB?
Project Euler: Problem 9, Pythagorean numbers
Back to basics 7 - Equal NaNs
Matrix multiplication across rows
Net Present Value of a Stream of Cash Flows
Lunar Arithmetic (Addition)
Homemade: Control Charts
Cryptography with A Square Matrix : Encoding
Lunar Arithmetic (Multiplication)
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