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<li><strong>划分阶段</strong>：通过递归不断 <strong>将数组从中点位置划分开</strong>，将长数组的排序问题转化为短数组的排序问题；</li>
<li><strong>合并阶段</strong>：划分到子数组长度为 1 时，开始向上合并，不断将 <strong>左、右两个短排序数组</strong> 合并为 <strong>一个长排序数组</strong>，直至合并至原数组时完成排序；</li>
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<p><img alt="merge_sort_overview" src="../merge_sort.assets/merge_sort_overview.png" /></p>
<p align="center"> Fig. 归并排序两阶段：划分与合并 </p>
<p><img alt="归并排序的划分与合并阶段" src="../merge_sort.assets/merge_sort_overview.png" /></p>
<h2 id="1151">11.5.1. &nbsp; 算法流程<a class="headerlink" href="#1151" title="Permanent link">&para;</a></h2>
<p><strong>「递归划分」</strong> 从顶至底递归地 <strong>将数组从中点切为两个子数组</strong>，直至长度为 1 ；</p>
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