Compute the product of the corner elements of an array (vector or matrix).
If any corner element is NaN, return NaN.
If any corner element is Inf, return Inf.
If both NaN and Inf appear among the corners, return -1.
If the input is empty, return 0.
Some built-in functions are forbidden.
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Last Solution submitted on Jul 06, 2026

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William Chris Cleveland George Berken Armando Longobardi

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