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    黑色星期五交易无序增长

    尽管零售商正在为黑色星期五准备一些未完成的优惠,但一度狂热的购物日的光芒已经减弱,因为产品折扣在假日季节开始提前出现。以前只在黑色星期五(以及在线等价物“网络星期一”)获得的折扣,逐渐转移到秋季早些时候。俄勒冈州本德的咨询服务公司恩德尔集团(EnderleGroup)首席分析师Rob Enderle表示:这更像是黑色、网络11月。他告诉《电子商务时报》:现在的趋势是,在亚马逊吞噬这一切之前,尽可能多地获取资金。“黑色星期五”早在10月份就开始了,一些零售商——办公仓库的数字业务高级副总裁Natalie Malaszenko,该办公室的总部设在佛罗里达州博卡拉顿,她对《电子商务时报》表示:10月底,许多零售商将走出去,谈论他们与众不同的——免运费、一小时内在商店取货的能力,或者价格匹配。马拉申科说:然后在11月——从字面上看,万圣节结束——你开始看到黑色星期五或黑色星期五的初见。她补充说:大多数零售商提前发布”黑色星期五”的插页,以帮助购物者确定去哪里。”整个 11 月的月变成了某种形式的黑色星期五定价月。

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    照明系统设计(动态规划)- UVA 11400

    You are given the task to design a lighting system for a huge conference hall. After doing a lot of calculation and sketching, you have figured out the requirements for an energy-efficient design that can properly illuminate the entire hall. According to your design, you need lamps of n different power ratings. For some strange current regulation method, all the lamps need to be fed with the same amount of current. So, each category of lamp has a corresponding voltage rating. Now, you know the number of lamps and cost of every single unit of lamp for each category. But the problem is, you are to buy equivalent voltage sources for all the lamp categories. You can buy a single voltage source for each category (Each source is capable of supplying to infinite number of lamps of its voltage rating.) and complete the design.

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