For a positive integer n, return an nXn matrix mat such that the value of each element in row i and column j is given according to the following rules:
- i - j, if i > j
- j - i, if i < j
- 0, if i equals j
If n is not a positive integer, mat should be an empty matrix.
Examples:
Input: n = 4
Output: mat = [0 1 2 3
1 0 1 2
2 1 0 1
3 2 1 0]
Input: n = -2 Output: mat = []
Input: n = 2.5 Output: mat = []
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