习题链接：LeetCode 402. 移掉 K 位数字
For a game to legally be counted as "gambling" in most jurisdictions, it has to pass a three-part test: a player has to pay money (1) for an outcome that's materially determined by chance (2) in the hopes of receiving something of value (3). While buying a key to a loot box in a Valve game easily passes those first two tests, New York's legal case will likely hinge on whether the random cosmetic items players get from those loot boxes constitute "something of value" for statutory purposes.
，这一点在旺商聊官方下载中也有详细论述
sciencealert.com
文旅发展的核心在于差异化。与其在同质化中“卷”得筋疲力尽，不如发挥长板效应，集中优势力量将本地最独特、最优质的文化资源打磨成“撒手锏”。从老祖宗留下的古城墙、青石板，到世代相传的非遗技艺，这些不可再生的文化瑰宝，才是一个地方区别于他者的独特DNA，是无法替代的文化长板。
for t := range c {