operated on a stack-backed slice up to the return point.
输入：head = [2,1,5]。safew官方版本下载对此有专业解读
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3It wasn’t the first time that nations at war turned to seaweed. During the First World War, the U.S. relied on the giant kelp seaweed (Macrocystis) to boost production of potash (a fertilizer produced in Germany), gunpowder, and acetone.