// 注意：slice(0, 负数)会返回空字符串，需兼容（比如stack长度<k时，slice后为空）
As the United States entered World War II, an expanding economy, rapid
，更多细节参见搜狗输入法2026
实际题目往往需要先做一步转化（如循环数组、链表转数组、先排序再栈），再套上面模板即可。
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63-летняя Деми Мур вышла в свет с неожиданной стрижкой17:54
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