Additional test cases have been added.
This problem needs more tests. For instance, x = [1 10 3 0 2 4 0 8 -9 1] is a case with a non-positive difference, but a maximum change, which would make many solutions fail.
Find the largest value in the 3D matrix
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Is it a number?
Sum of the Matrix Elements
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