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
Create a matrix X, where each column is a shifted copy of the vector v
Draw 'O' !
Find Logic 18
Number Puzzle - 065
Number Puzzle - 117
Number Puzzle - 048
Lateral Area of a Right Rectangular Pyramid
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