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
Set some matrix elements to zero
convert matrix to single column
Extra safe primes
Perimeter of a semicircle
Number Puzzle - 098
Matrix Pattern 7
Number Puzzle - 073
Number Puzzle - 119
Number Puzzle - 047
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