Largest Subsequence Product

	/**
	 * Compute Largest Subsequent Product (LSP) in Linear Time
	 * 
	 * e.g.
	 * 
	 * {1, -0.5, -0.5, 3.0, -6, -1}
	 * 
	 * LSP = 3.0 * (-6) * (-1) = 18
	 * 
	 * */