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bilibili将军最爱的Toro
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takeaway1 Effective Alpha (\(\alpha _{eff}\)) 衡量的是子树的“存在性价比”：它的数值越小，代表该分支在牺牲大量复杂度的前提下仅换取了极微小的误差减幅，因此是应被优先剪掉的“低效冗余”。 备注：第一次在这个平台做树的题目啊，感觉储存方式很奇怪 ...
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