Simple but fun
I'm not sure this would work if there is a 0 in x...
Rotate input square matrix 90 degrees CCW without rot90
Insert zeros into vector
03 - Matrix Variables 1
Replace 0 to NaN!
Rotate matrix by -90 degrees
Make an identity matrix whose diagonal elements are 1:n
Sum the rows
Replace all odd numbers with NaN
find the 'M'
Where is the number that you want to find?
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