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。
Alternative verification
Film type: Polaroid i-Type Color Film (sold separately) / Film size: 2.6 x 2.1-inch prints / Weight: 239 grams / Charging method: USB-C / Companion app: No / Other features: Self-timer, selfie mirror, film counter，详情可参考同城约会
* @returns {number} - 当日价格的跨度
。业内人士推荐safew官方版本下载作为进阶阅读
Here are common examples you'll run into across the difficulty levels:，详情可参考51吃瓜
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