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Update knapsack_problem and intro_to_dp
Fix avl_tree
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@@ -542,10 +542,10 @@ AVL 树的特点在于「旋转 Rotation」操作,它能够在不影响二叉
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| 失衡节点的平衡因子 | 子节点的平衡因子 | 应采用的旋转方法 |
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| ---------------- | ---------------- | ---------------- |
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| $>0$ (即左偏树) | $\geq 0$ | 右旋 |
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| $>0$ (即左偏树) | $<0$ | 先左旋后右旋 |
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| $<0$ (即右偏树) | $\leq 0$ | 左旋 |
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| $<0$ (即右偏树) | $>0$ | 先右旋后左旋 |
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| $>1$ (即左偏树) | $\geq 0$ | 右旋 |
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| $>1$ (即左偏树) | $<0$ | 先左旋后右旋 |
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| $<-1$ (即右偏树) | $\leq 0$ | 左旋 |
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| $<-1$ (即右偏树) | $>0$ | 先右旋后左旋 |
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</div>
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