startSet = [{ key = 0; state = init; }];
Bengaluru, Government & Policy, India, Karnataka, Social, Social media ban，详情可参考新收录的资料
const res = new Array(n);，推荐阅读新收录的资料获取更多信息
南方周末：为什么建筑设计行业仍在沿用2002年的收费标准？
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: