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
Distance walked 1D
Reverse the vector
Matrix indexing with two vectors of indices
Set some matrix elements to zero
Convert radians to degrees
Number Puzzle - 024
Number Puzzle - 112
Number Puzzle - 047
Number Puzzle - 045
Volume of Spherical Shell
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