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
Times 2 - START HERE
Rotate input square matrix 90 degrees CCW without rot90
Find the 9's Complement
Calculate Amount of Cake Frosting
Laws of motion 6
Number Puzzles - 016
Number Puzzle - 028
Number Puzzle - 037
Number Puzzle - 091
A Simple Shielding Problem
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