Your solution is fastest so far.
Good job, Athi.
@Athi, your solution contains many "magic" constant variables that I don't know how you got.
William's solution is much easier to understood, although it is slower than yours.
Thanks li haitao.
Finding Perfect Squares
Back to basics 19 - character types
subtract central cross
Pernicious Anniversary Problem
Lights Out 2 - 5x5, 4 moves
Dice roll - opposite faces
Divisible by 10
Weighted Gold/Silver Standard
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