Sorry, the logic of what the problem suggests is not very clear to me. Should the input 2D matrix be broken up in 2-by-2 matrices first, and why?
@Bainhome, I believe your code cannot perform an adaptive zigzag scan of a valid 2x2 matrix due to the conditional statement implemented.
S**t, a euqal sign is forgotten...THX buddy.
What this code done to the index by using union is well-considered. Nice!
Remove the vowels
Operate on matrices of unequal, yet similar, size
Divide by 4
Stop a ZigZag scanning N*N Matrix at any diag you want
Find my secret function I
Hilbert Scan Algorithm
Find my secret function II
Divisible by 21
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