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
Make one big string out of two smaller strings
Bottles of beer
Calculate the Number of Sign Changes in a Row Vector (No Element Is Zero)
Mass Conversion 2
Number Puzzle - 075
Number Puzzles - 004
Number Puzzle - 037
Find the Pattern 6
Number Puzzle - 036
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