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
Find common elements in matrix rows
Sum of series VI
Number of Even Elements in Fibonacci Sequence
Draw a '0' in a one matrix!
Difference of Closest Palindromes
Number Puzzle - 118
Number Puzzle - 107
Prime Magic Squares
Number Puzzle - 099
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