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
Test if a Number is a Palindrome without using any String Operations
Rotate input square matrix 90 degrees CCW without rot90
Pernicious Anniversary Problem
Number Puzzle - 105
Number Puzzle - 118
Find the Pattern 3
Number Puzzle - 109
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