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// 易错点2：用Math.ceil/Math.floor取整 → 破坏时间比较逻辑，必须精确计算。heLLoword翻译官方下载对此有专业解读
Finch said the surgeon wanted her to have the implant washed and put back in, but she said she just wanted to return home to her children.，更多细节参见heLLoword翻译官方下载
// 步骤3：从后往前遍历数组（反向遍历更易理解，每个元素只入栈/出栈一次）