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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M6 2h12v6l-4 4 4 4v6H6v-6l4-4-4-4V2m10 14.5-4-4-4 4V20h8v-3.5m-4-5 4-4V4H8v3.5l4 4M10 6h4v.75l-2 2-2-2V6Z"/></svg>
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<span class="md-ellipsis">
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第 2 章 复杂度
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第 2 章 时空复杂度
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<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_3_label" aria-expanded="false">
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<label class="md-nav__title" for="__nav_3">
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<span class="md-nav__icon md-icon"></span>
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第 2 章 复杂度
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第 2 章 时空复杂度
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</label>
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<ul class="md-nav__list" data-md-scrollfix>
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M19.3 17.89c1.32-2.1.7-4.89-1.41-6.21a4.52 4.52 0 0 0-6.21 1.41C10.36 15.2 11 18 13.09 19.3c1.47.92 3.33.92 4.8 0L21 22.39 22.39 21l-3.09-3.11m-2-.62c-.98.98-2.56.97-3.54 0-.97-.98-.97-2.56.01-3.54.97-.97 2.55-.97 3.53 0 .96.99.95 2.57-.03 3.54h.03M19 4H5a2 2 0 0 0-2 2v12a2 2 0 0 0 2 2h5.81a6.3 6.3 0 0 1-1.31-2H5v-4h4.18c.16-.71.43-1.39.82-2H5V8h6v2.81a6.3 6.3 0 0 1 2-1.31V8h6v2a6.499 6.499 0 0 1 2 2V6a2 2 0 0 0-2-2Z"/></svg>
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<span class="md-ellipsis">
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第 6 章 散列表
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第 6 章 哈希表
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<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_7_label" aria-expanded="false">
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<label class="md-nav__title" for="__nav_7">
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<span class="md-nav__icon md-icon"></span>
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第 6 章 散列表
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第 6 章 哈希表
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</label>
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<ul class="md-nav__list" data-md-scrollfix>
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</div>
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<h2 id="1155">11.5.5 尾递归优化<a class="headerlink" href="#1155" title="Permanent link">¶</a></h2>
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<p><strong>在某些输入下,快速排序可能占用空间较多</strong>。以完全倒序的输入数组为例,由于每轮哨兵划分后右子数组长度为 <span class="arithmatex">\(0\)</span> ,递归树的高度会达到 <span class="arithmatex">\(n - 1\)</span> ,此时需要占用 <span class="arithmatex">\(O(n)\)</span> 大小的栈帧空间。</p>
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<p>为了防止栈帧空间的累积,我们可以在每轮哨兵排序完成后,比较两个子数组的长度,<strong>仅对较短的子数组进行递归</strong>。由于较短子数组的长度不会超过 <span class="arithmatex">\(\frac{n}{2}\)</span> ,因此这种方法能确保递归深度不超过 <span class="arithmatex">\(\log n\)</span> ,从而将最差空间复杂度优化至 <span class="arithmatex">\(O(\log n)\)</span> 。</p>
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<p>为了防止栈帧空间的累积,我们可以在每轮哨兵排序完成后,比较两个子数组的长度,<strong>仅对较短的子数组进行递归</strong>。由于较短子数组的长度不会超过 <span class="arithmatex">\(n / 2\)</span> ,因此这种方法能确保递归深度不超过 <span class="arithmatex">\(\log n\)</span> ,从而将最差空间复杂度优化至 <span class="arithmatex">\(O(\log n)\)</span> 。</p>
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