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
Extract leading non-zero digit
Symmetry of vector
Divisible by 5
Perimeter of a semicircle
Splitting Square - Problem the third
Number Puzzle - 043
Number Puzzle - 094
Number Puzzles - 007
Number Puzzle - 089
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