Here's the insertion algorithm in Python. Step through the code and watch each line execute on the tree:
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怎样走出死胡同？针对“落伍”条款，上海审批部门在走访调研基础上，发布新版食品经营许可审查细则。根据新规，门店可以在两个区域间竖起玻璃门作为防护隔断，问题迎刃而解。
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The story starts with quantum field theory, which is incredibly complex, but the simplified version is that even empty space is filled with fields that could govern the interactions of any quantum objects in or near that space. You can think of different particles as energetic excitements of these fields—so a photon is simply an energetic state of the quantum field.