First non-zero element in each column
"Low : High - Low : High - Turn around " -- Create a subindices vector
How many trades represent all the profit?
Change the sign of even index entries of the reversed vector
Count the number of folds needed to pack a large sheet
Pitting corrosion on a metal plate: Count the number of pits
Find an overlap in the cleaning schedule of two tank reactors
Design a tubesheet for shell-and-tube heat exchangers
Calculate the sphericity of a Raschig ring
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