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- 父节点i的左子: 2*i+1, 右子: 2*i+2
，这一点在同城约会中也有详细论述
The last decade hasn’t been smooth. Brewster rattles off challenges: tariffs on equipment and consumables sourced from China, Europe, Mexico, and Canada; price hikes on vinyl and paper; labor shortages; and SBA lending issues layered on top of the whiplash of COVID, when only “necessary businesses” were allowed to stay open.
从顾客视角来看，他们的核心预期很简单：安全、放心、真实透明以及被尊重。很多旺店最大的差评往往是“排队太久且无服务”——同样是排队，海底捞会提供小吃、饮用水，而有些门店让客人在寒风中苦等，自然会引发不满。