I think you want to write A and not x:
test case #2 and 3 should be corrected. Instead of x, it should be A
What elements do you consider the "surrounding arrays"?
Surrounding arrays apparently are the elements right above, below, left, and right the zero elements. Found out by reverse engineering. The x is still a mystery.
More tests please. A lot of solutions assume that 0 can't be in the first (or last) column.
Reindex a vector
Detect a number and replace with two NaN's
Given a matrix, return the last eigen value
subtract central cross
Distance a ball travels after throwing vertically
Convert Fahrenheit to Celsius
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