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CodingBat code practice

Java > Array-3 > squareUp
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Given n>=0, create an array length n*n with the following pattern, shown here for n=3 : {0, 0, 1,    0, 2, 1,    3, 2, 1} (spaces added to show the 3 groups).

squareUp(3) → {0, 0, 1, 0, 2, 1, 3, 2, 1}
squareUp(2) → {0, 1, 2, 1}
squareUp(4) → {0, 0, 0, 1, 0, 0, 2, 1, 0, 3, 2, 1, 4, 3, 2, 1}

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