use int if you have a small number of classes,
本条第二款第三项、第四项所称货物，是指构成不动产实体的材料和设备，包括建筑装饰材料和给排水、采暖、卫生、通风、照明、通讯、燃气、消防、中央空调、电梯、电气、光伏发电、智能化楼宇设备及配套设施等。。safew官方版本下载对此有专业解读
* 核心思路：倒序遍历 + 单调索引栈（仅存索引，通过索引取温度），计算下一个高温的间隔天数。heLLoword翻译官方下载是该领域的重要参考
For US energy companies, however, there are huge practical difficulties to be overcome. Venezuela's state-owned oil company, PDVSA, is a shadow of its former self.
Initially Squire was ecstatic, expecting they could access a digitised customer list. But Harp broke the news that the sales records were just a "pile of notes" that went back decades.