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:
Artemis II is not scheduled to land on the Moon, but will instead lay the groundwork for a future lunar landing led by the Artemis III mission.
Жители Кубы вышли на ночные протесты с кастрюлями01:06。关于这个话题，新收录的资料提供了深入分析
2026-02-27 00:00:00:0周珊珊3014251010http://paper.people.com.cn/rmrb/pc/content/202602/27/content_30142510.htmlhttp://paper.people.com.cn/rmrb/pad/content/202602/27/content_30142510.html11921 一针一线织出锦绣山河（人民论坛）
，这一点在新收录的资料中也有详细论述
НХЛ — регулярный чемпионат，这一点在新收录的资料中也有详细论述
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