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
Get the length of a given vector
Return the first and last characters of a character array
Sum of series III
Period of a pendulum
Number Puzzle - 071
Number Puzzle - 067
Number Puzzles - 021
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