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@ -5308,7 +5308,7 @@ O(1) < O(\log n) < O(n) < O(n^2) < O(2^n) \newline
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<p align="center"> 图 2-18 递归函数产生的平方阶空间复杂度 </p>
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<h3 id="4-o2n">4. 指数阶 <span class="arithmatex">\(O(2^n)\)</span><a class="headerlink" href="#4-o2n" title="Permanent link">¶</a></h3>
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<p>指数阶常见于二叉树。观察图 2-19 ,高度为 <span class="arithmatex">\(n\)</span> 的“满二叉树”的节点数量为 <span class="arithmatex">\(2^n - 1\)</span> ,占用 <span class="arithmatex">\(O(2^n)\)</span> 空间:</p>
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<p>指数阶常见于二叉树。观察图 2-19 ,层数为 <span class="arithmatex">\(n\)</span> 的“满二叉树”的节点数量为 <span class="arithmatex">\(2^n - 1\)</span> ,占用 <span class="arithmatex">\(O(2^n)\)</span> 空间:</p>
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