Doddy -- I think the last two columns of y_correct in problem 4 are incorrect.
@William , I think it is correct.
Binbin -- Yes, I see. It's just a more difficult problem than I thought it was!
@William, Yes. It is hard to guess the author's thoughts
First non-zero element in each column
601 Solvers
How many trades represent all the profit?
526 Solvers
205 Solvers
206 Solvers
68 Solvers
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