很多商家完全是把AI当成“免费蹭热度神器”，主打一个“不花钱蹭流量”。
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，这一点在新收录的资料中也有详细论述
If you address them upfront, chances are you’ll hit a wall. It will be painful. You will be late. Clients and management will be upset. Trust will erode and without trust, there are few chances you can get management support for necessary refactorings.
We can do this by adding a boolean dirty flag to each node. If it’s set to true, then this is a node that needs to be recalculated. Otherwise, it’s up-to-date. Let’s start with these flags all set to false — we have an up-to-date tree. Now, when we update the input node, we can iterate over all the children of that node, and follow a simple algorithm:
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